Doc 7030 offers the controller no guidance, leaving responsibility for separation entirely with the pilot. the condition of the pilots (i.e. All operators of 777s powered by PW4000 series engines have grounded their fleets indefinitely. CircleIn order to stay within a fairly confined area, to add further drag, and to look for traffic below, bank the airplane 30 degrees in either direction and stay in that position until you are ready to roll out. 2.9 Doc 7030 (Regional Supplementary Procedures) provides guidance for pilots in distress who need to execute an emergency descent. the level of surveillance provided in the operational environment. The pilot must juggle competing priorities and instantly determine the best course of action. Updates are needed to handle modern scenarios. 9.1.1.2 The aircraft shall not descend below the lowest published minimum altitude that will provide a minimum vertical clearance of 300 m (1 000 ft) or, in designated mountainous terrain, of 600 m (2 000 ft) above all obstacles located in the area specified. Investigation found that the cause of the failure was an undetected manufacturing fault in the 15 year-old aircraft. In the event that the pilot does not or cannot coordinate with air traffic control prior to descent, the pilot should understand that there is now a risk of collision that may be avoided by one of the following means: 2.3 The situation is somewhat analogous to a Resolution Advisory (RA), in that the descending aircraft is not following a clearance and the pilot knows first what that aircraft is about to do. This article provides guidance for controllers on what to expect and how to act when dealing with an emergency descent which takes place in controlled airspace. When the Cabin Altitude reached 10,000 feet, the descent already commenced was completed as an emergency descent and the flight thereafter was without further event. An initial target altitude which is the higher of MORA, MOCA, MEA (as appropriate to routing and aircraft capability), or a specified Company/manufacturer value (often 10,000') will be selected. the nature of the emergency including the ability of the pilots to control the aircraft. Emergency descents get the airplane from altitude down toward the ground at the fastest rate possible, without building up additional airspeed. Responsibility will be transferred to another station only if better handling will result. Please turn on JavaScript and try again. A diversion was immediately initiated and an emergency declared. Also note that the International Coordinating Council of Aerospace Industries Associations recently recommended against this practice. The Investigation attributed the pressure loss to a fatigue crack in a door skin which was initiated due to a design issue with door Cover Plates, which had not been detected when the Cover Plate was replaced with an improved one eighteen months earlier. On 5 January 2014, an Airbus A380-800 en route to Singapore at night made an emergency descent and diversion to Baku after a loss of cabin pressure without further event. The broadcast emergency message should contain instructions for specific actions to be taken by aircraft addressed in the broadcast or, alternatively, instructions to continue in accordance with their current clearances, and stand by on the appropriate channels for further clearances and instructions. Copyright SKYbrary Aviation Safety, 2021-2022. The Investigation has already established that the failure originated in a single fan blade within which internal fatigue cracking had been initiated. After a relatively brief hiatus from the Private Pilot Practical Test Standards, the latest revision of the document includes the requirement to perform an emergency descent. Immediately after such an emergency broadcast has been made the ACC, the approach control unit, or the aerodrome control tower concerned shall forward further clearances to all aircraft involved as to additional procedures to be followed during and subsequent to the emergency descent. Before, there was a lot of confusion around the wording of these two procedures - but ICAO has now made this much clearer, and they have even . Such a clearance is akin to instantly authorizing all aircraft on a controllers frequency to deviate for weather. 9.1.1.1 When an aircraft operated as a controlled flight experiences sudden decompression or a malfunction requiring an emergency descent, the aircraft shall, if able: a) initiate a turn away from the assigned route or track before commencing the emergency descent; b) advise the appropriate air traffic control unit as soon as possible of the emergency descent; c) set transponder to Code 7700 and select the Emergency Mode on the automatic dependent surveillance/controller-pilot data link communications (ADS/CPDLC) system, if applicable; e) watch for conflicting traffic both visually and by reference to ACAS (if equipped); and. 3.7 An aircraft executing an emergency descent cannot be expected to respond to a resolution advisory. Each Contracting State shall establish a National Air Transport Facilitation Committee, and Airport Facilitation Committees as required, or similar coordinating bodies, for the purpose of coordinating facilitation activities between departments, agencies, and other organizations of the State concerned with, or responsible for, various aspects of international civil aviation as well as with airport and aircraft operators. ICAO Doc 4444, Procedures of Air Navigation Services Air Traffic Management (PANS-ATM). Emergency Descent Procedures Presented by TOC Summary Existing ICAO recommended practices concerning emergency descent procedures provide guidance to pilots and ATS units in the event of an emergency descent. The following video describes the generic procedures followed by aircrew in certain unusual situations: If you wish to contribute or participate in the discussions about articles you are invited to join SKYbrary as a registered user. When an aircraft operated as a controlled flight experiences a malfunction requiring an emergency descent, ICAO EUR Region procedures state that crew shall,if able: A wide range of practical problems could arise in the cockpit following the decision to initiate an emergency descent: Best practice embedded in theASSISTprinciple could be followed (A- Acknowledge;S- Separate,S- Silence;I- Inform,S- Support,T- Time): A- acknowledge the descent (the declared malfunction and emergency if applicable), ask for the crews intentions when the situation permits, S- separate other aircraft from the emergency aircraft and issue essential traffic information about the emergency descent. The following actions will be taken in the event an aircraft must make an emergency descent: In the event an aircraft requests an emergency descent: Issue a clearance to the requested altitude if approved separation can be provided. In this case, a pilot may be following guidance or executing maneuvers in direct conflict with the ATC clearance. A condition of distress, being threatened by serious and or imminent danger and requiring immediate assistance. 9.1.2.2 In particular, they may, as required by the situation: Eurocontrol 2010, Safety Warning Message, Emergency Descent in High Traffic Density Situations. Emergency Descent Plans, Procedures, and Context Amy Pritchett* and Jennifer Ockerman *Schools of Industrial and Systems Engineering and Aerospace Engineering, Georgia Institute of Technology 765 Ferst Drive, Atlanta, GA 30332-0205 USA [email protected] Georgia Tech Research Institute and School of Industrial and Systems Engineering, Georgia Institute of Technology An emergency descent does not involve a quick in-flight correction or flipping a few switches. When an aircraft announces that it is making an emergency descent, the controller will take all possible action to safeguard other aircraft. 1.2 ICAO has added the issue of Emergency Descent procedures to the work programme of the Operations Panel (OPSP). the ability to communicate with the emergency aircraft. A successful emergency descent was made with a diversion to Yuma, where the aircraft landed half an hour later. It noted that Airbus is developing a modified controller that will prevent erroneous data calculations occurring. As always, the most important emergency procedure you can ever remember is to aviate, navigate, and then communicate These three steps are really a continuous process which never stops requiring pilot judgment to prioritize steps Aviate: Complete any immediate action procedures that may be required The Panel will be forwarding recommendations for amendments to PANS-ATM to the Air Navigation Commission for approval this year. RefRegionalSupplementary Procedures, ICAO DOC7030-EUR EMERGENCY DESCENT PROCEDURES ACTION BY PILOT-IN-COMMAND 1. 3.2 ICAO provides guidance regarding emergency descent for pilots in Doc 8168 and for both pilots and controllers in Doc 7030 and PANS-ATM sections 15.1.4 and 12.3.2.5. It is a life-threatening event such as an engine on fire, smoke in the cabin, or a rapid depressurization within the aircraft. ICAO EUR Region 2009, Doc 7030, Part III 9.1.1 Action by the pilot-in-command 9.1.1.1. The recovery . About 2 minutes to offset and then maybe 5 minutes for a high speed descent from max . Establish communications with and alert nearby aircraft by broadcasting at suitable intervals: aircraft identification, flight level, position (including ATS route designator or the track code) and intentions, on the frequency in use and on 121.5 MHz (or as a backup, on the inter-pilot air-to-air frequency 123.45 MHz); A single fan blade was found to have failed due to undetected fatigue. If the MEA, as corrected for existing conditions, is above 14,000' (13,000' for some National Aviation Authorities (NAA)), continuing the descent to MOCA would be prudent. The Investigation found that both systems failed due to malfunctioning pre-cooler control valves and that these malfunctions were due to a previously identified risk of premature deterioration in service which had been addressed by an optional but recommended Service Bulletin which had not been taken up by the operator of the aircraft involved. An example requiring a MAYDAY call would be an emergency descent, smoke in the cockpit, engine failure, etc. You may be trying to access this site from a secured browser on the server. On 15 August 2018, a Boeing 737-300SF crew concerned about a small residual pressure in a bleed air system isolated after a fault occurred en-route then sought and were given non-standard further troubleshooting guidance by company maintenance which, when followed, led directly and indirectly to additional problemsincluding successive incapacitation of both pilots and a MAYDAY diversion. The contingency plans shall be tested on a regular basis. The Investigation found that the aircraft concerned was carrying a number of relevant individually minor undetected defects which meant the initial crew response was not completely effective and prompted a request for in-flight assistance which was unnecessary and led to the further outcomes. 2.4 In an RA, ACAS takes action to provide collision avoidance. We assume that pax & crew are on O2. Existing ICAO recommended practices concerning emergency descent procedures provide guidance to pilots and ATS units in the event of an emergency descent. 3.5 In an emergency descent, both the pilot and the controller must consider multiple factors and instantly determine the best course of action. Whether you're flying a Boeing 777 or Piper Warrior, every pilot trains on how to fly emergency descents. the type of aircraft and performance characteristics. Note that the selection of TA only does not stop the generation of resolution advisories by the TCAS in other aircraft. The following events on the SKYbrary database involved an emergency descent: On 20 February 2021, a PW4077-powered Boeing 777-200 was climbing through 12,500 feet after takeoff from Denver when there was a sudden uncontained failure of the right engine. The need for this manoeuvre may result from anuncontrollable fire, a sudden loss ofcabin pressurization, or any other situation demanding an immediate and rapid descent. hypoxia, depressurization, health crisis, etc. Coordination of emergency response planning. The PANS-ATM uses the term clear the specified area (15.1.4.2), which directly implies pilots should navigate off their assigned routes at their own discretion, in conflict with core principles of air traffic control. 2.7 Effective procedures for handling emergency descents will vary based on a wide variety of factors. Except when prohibited by the manufacturer, the power should be reduced to . Emergency descent means we want to get on the ground as quickly as possible. The station addressed should immediately acknowledge a distress or urgency message, provide assistance, coordinate and direct the activities of assisting facilities, and alert the appropriate search and rescue coordinator if warranted. The Investigation found that an engineer had mixed up which pressurisation system valve was to be de-activated before departure and that the flight crew decision to continue the climb had been risky. This method can be effective in the NAT because all aircraft should be on tracks (although in some cases aircraft may cross them). 9.1.2 The aerodrome emergency plan shall provide for the coordination of the actions to be taken in an emergency occurring at an aerodrome or in its vicinity. PAN-PAN may be appropriate when an immediate weather . 9.1.3 The plan shall coordinate the response or participation of all existing agencies which, in the opinion of the appropriate authority, could be of assistance in responding to an emergency. An emergency descent could be initiated without prior warning. 3. Emergency Communications protocols using the distress (MAYDAY) signal or urgency (PAN PAN) signal should be used as appropriate. No controller would ever consider such a clearance. If necessary inform the crew of the minimum safe altitude. The Investigation found that the cause of the in-flight failure was addressed by an optional SB not yet incorporated. S- support the flight with any information requested and deemed necessary. This is likely the worst possible scenario for a controller. Note In the absence of specific instructions provided to the aircraft addressed in the broadcast, it may be expected that such aircraft will clear the area on their own initiative. Please enable scripts and reload this page. Sections: The Section 9.1 then outlines a set of nine (9) recommendations for the design and preparation of an aerodrome emergency plan. Emergency descent procedures are not as clear. The ATS unit concerned shall additionally inform any other ATS units and control sectors which may be affected. One of those priorities must be the potential for interaction with aircraft below. 1.1 Recent publications by Eurocontrol and the International Federation of Airline Pilots Associations (IFALPA) address the need for a more detailed approach to emergency descent procedures than currently exists in ICAO documents. An emergency descent is a manoeuvre for descending as rapidly as possible to a lower altitude (potentially, to the ground for an emergency landing). ( as the rvsm procedure allows ) Or am I overreacting? Aircraft forced to manoeuvre without receipt of a revised clearance should broadcast position and intentions, at frequent intervals, on 121.5 MHz (123.45 MHz back-up). An emergency descent and a diversion to Pensacola followed without further event. An ERP is a comprehensive, operational-level document outlining specific roles, set of actions and timeframes to respond to unexpected situations, disruptions or potential disruptions. One member of the cabin crew and an off duty staff member who tried to assist him became temporarily unconscious after disregarding training predicated on the time of useful consciousness after sudden depressurisation. The general broadcast to warn aircraft of an emergency descent should be followed, as necessary, by specific instructions. But this is not necessarily desirable for separation. When deemed necessary, air traffic control units shall immediately broadcast by means of the appropriate radio aids, or if not possible, request the appropriate communications stations immediately to broadcast an emergency message. 3.4 The guidance in the PANS-ATM does not establish clarity in the decider role in the event of an emergency descent and in fact encourages a situation in which all of the affected pilots may be navigating independently. However, these provisions are outdated. Some are better than others and will help in differing qualities. 9.1.2.1 Immediately upon recognizing that an emergency descent is in progress, air traffic control units shall acknowledge the emergency on radiotelephony. It looks like your browser does not have JavaScript enabled. a) suggest a heading to be flown, if able, by the aircraft carrying out the emergency descent in order to achieve separation from other aircraft concerned; b) state the minimum altitude for the area of operation, only if the level-off altitude stated by the pilot is below such minimum altitude, together with the applicable QNH altimeter setting; and Emergency Descent: Guidance for Flight Crews, Human Error in Aviation and Legal Process, Stabilised Approach Awareness Toolkit for ATC, Flight Deck Procedures (A Guide for Controllers), Controller Pilot Data Link Communications (CPDLC), Pressurisation Problems: Guidance for Controllers, Emergency Descent: Guidance for Controllers, Pressurisation Problems: Guidance for Flight Crews, Safety Warning Reminder Message, 20100722, Emergency Descent in High Traffic Density Situations, Aircraft Depressurisation - Cabin crew information bulletin, Initiate a turn away from the assigned route or track before initiating the descent (, Advise the appropriate air traffic control unit as soon as possible of the emergency descent, Watch for traffic both visually and with reference to, Coordinate further intentions with the appropriate ATC unit. However, the first officer must also be able to effectively complete an emergency descent in the event that the captain is incapacitated or absent from the flight deck. On 30 June 2015, both bleed air supplies on a Boeing 737-400 at FL370 failed in quick succession resulting in the loss of all pressurisation and, after making an emergency descent to 10,000 feet QNH, the flight was continued to the planned destination, Kansai. 1.2 ICAO has added the issue of Emergency Descent procedures to the work programme of the Operations Panel (OPSP). Aircraft Owners & Pilots Association Find it free on the store. The subsequent Investigation was carried out together with that into a similar occurrence to another Finnair A330 which had occurred 11 days earlier. The Investigation found that the battery had been destroyed when thermal runway followed a suspected internal short circuit in one of the battery cells and concluded that certification had underestimated the potential consequences of such a single cell failure. A generic checklist for handling unusual situations is readily available fromEUROCONTROLbut it is not intended to be exhaustive and is best used in conjunction with local ATC procedures. 2.14 In non-surveillance environments, specific clearances to aircraft may not be feasible. Outside of training, they're triggered by worst-case, often life-threatening emergencies. A short list of these would include: Not only will the most effective emergency descent guidance differ between environments with and without surveillance, but the presence of so many factors means virtually every situation will be unique and will not conform to a one size fits all procedure. The recent efforts of Eurocontrol and IFALPA highlight the need to adopt a somewhat more modern approach to developing emergency descent procedures. When an emergency descent is required, immediately reduce the power to idle, configure the airplanedirty or clean, as the situation dictatesand position the propeller and fuel controls while rolling into a bank to obtain the descent pitch attitude necessary to establish the target descent speed. However, these provisions are outdated. Theautopilotof many current generation aircraft can be used by the PF to carry out an emergency descent profile and many manufacturers recommend that the autopilot be left engaged for the manoeuvre. 9.1.1 An aerodrome emergency plan shall be established at an aerodrome,commensurate with the aircraft operations and other activities conducted at the aerodrome. The Investigation found that the cause was the processing of internally corrupted data in the active cabin pressure controller which had used a landing field elevation of over 10,000 feet. 9.1.1.1.1 An aircraft that is not MNPS/RVSM-approved and is unable to maintain a flight level above MNPS/RVSM airspace should descend to a flight level below MNPS/RVSM airspace. It is less effective in non-oceanic airspace since direct routings and vectors are commonplace. The major reason for a 'startle/surprise' emergency descent to be performed is the pressurisation scenario. 1.4. 2.11 This is from the European Supplement of Doc 7030: 9.1 EMERGENCY DESCENT PROCEDURES (P-ATM Chapter 15). There is no prescription in respect of the direction in which such a turn should be made and not all States follow this part of the ICAO model anyway. Unless structural damage is suspected, the aircraft should be descended at or near maximum speed (Vmo) with thrust at idle andflight spoilers or speed brakesextended. Popular searches: SI, Super, how many traffic for a controller, tower, Training, INFORMATION ON PROFESSIONAL MATTERS (INFO), Study Space-Based Automatic Dependent Surveillance Broadcast, Industrial Relations under ILO Conventions, Doc 8168 guidance for pilots in emergency situations, PANS-ATM 15.1.4 guidance for pilots and controllers, Use of visual methods by the descending aircraft, Direct control of the aircraft below by the controller. Initiation of an emergency descent is done as a memory item drill in most aircraft types. If there is a procedure there, that will be the best way to do it. On 5 March 2018, the crew of an Airbus A320 in descent towards Karachi observed a slow but continuous drop in cabin pressure which eventually triggered an excessive cabin altitude warning which led them to don oxygen masks, commence an emergency descent and declare a PAN to ATC until the situation had been normalised. This is intended to avoid triggerring a co-ordinated RA, since the emergency aircraft likely cannot respond to the RA. the ability to communicate with other aircraft. On 17 April 2018, sudden uncontained left engine failure occurred to a CFM56-7B powered Boeing 737-700 when climbing through approximately FL320. Once the descent has been initiated, it is standard procedure to confirm that all required actions have been completed by referring to the appropriate checklist in theQuick Reference Handbook (QRH). In addition to emergency response and contingency plans, operators are encouraged to develop business continuity plans (BCP), which go beyond the immediate . On 5 March 2011, a Finnair Airbus A320 was westbound in the cruise in southern Swedish airspace after despatch with Engine 1 bleed air system inoperative when the Engine 2 bleed air system failed and an emergency descent was necessary. We have a big problem like an engine fire or smoke in the cabin or some other very serious problem. A landing at Takamatsu was made 20 minutes later and an emergency evacuation completed. The Investigation found that collateral damage had followed low-cycle fatigue cracking of a single fan blade due to a previously unrecognised weakness in the design of this on-condition component which, because it had not been detected during the engine certification process, meant its consequences could not have been predicted. ATC is part of the team. In the event of loss of pressurisation, the standard procedure is to initiate an emergency descent to the higher of 10,000' or the Minimum En-route Altitude (MEA). 2.15 It should be noted that the pilot in command of an aircraft executing an Emergency Descent may choose to put the TCAS / ACAS mode on TA only. If in a retractable-gear airplane, lower the gear. Both parties understand this explicitly. In modern airspace many aircraft may be off route or there may be strategic offsets or micro-offsets in place. Ian J. Twombly is senior content producer for AOPA Media. The International Civil Aviation Organization (ICAO), in its capacity to develop Standards and Recommended Practices (SARPs) for the safety, efficiency and regularity of international civil aviation, has published specific SARPs to address the necessity and importance of emergency response planning and coordination for various stakeholders of the aviation system.. International Civil Aviation Organization. Starting 28th March 2019, there will be some changes to the contingency and weather deviation procedures on the NAT. Initiate a turn away from the assigned route or track before commencing the emergency descent (ICAO Doc 7030, para 9.1.1.1). Here are the citations from PANS-ATM: Upon receipt of advice that an aircraft is making an emergency descent through other traffic, all possible action shall be taken immediately to safeguard all aircraft concerned. 2.13 Flight crew workload can be expected to increase significantly during emergency descents. The ensuing frequency congestion could exacerbate an already disorderly situation. Copyright SKYbrary Aviation Safety, 2021-2022. There are some considerations which will not only enable the controller to provide as much support as possible to the aircraft involved, but to also maintain the safety of other aircraft in the vicinity and of the ATC service provision in general. which kind of turn, or other action, is expected from them . In mountainous terrain, specificescape routesmay be required. 4. It is important for controllers to have knowledge of the flight deck procedures that will be used by aircrew in such situations. Such generic and open-ended directions are far more likely to create newconflicts than to resolve any conflict associated with the emergency descent. There is no prescription in respect of the direction in . When an aircraft operated as a controlled flight experiences a malfunction requiring an emergency descent, ICAO EUR Region procedures state that crew shall, if able: Initiate a turn away from the assigned route or track before commencing the emergency descent (ICAO Doc 7030, para 9.1.1.1). the equipage of the aircraft especially in regards to ACAS. Advise the appropriate air traffic control unit as soon as possible of the emergency descent, Watch for conflicting traffic both visually and by reference to, Coordinate its further intentions with the appropriate ATC unit, Take all necessary action to safeguard all aircraft concerned, Provide a heading, if requested or otherwise necessary for risk management, Provide separation or issue essential traffic information, as appropriate, State the applicable minimum safe altitude, if necessary (REMEMBER: The aircraft should not descend below the lowest published minimum altitude which will provide a minimum vertical clearance of 300m (1000 ft) or in designated mountainous terrain 600m (2000 ft) above all obstacles located in the area specified.). Conclusions 1 Emergency descent situations are analogous to Resolution Advisories in that they may introduce a second decision-maker within the ATC environment - the pilot of the aircraft executing an emergency descent. Specifically, the Eurocontrol document advises that several Air Navigation Service Providers (ANSPs) in the European region have published procedures that are expected to be more effective in high density traffic environments. On 21 February 2017, an Airbus A320 despatched with the APU inoperative experienced successive failures of both air conditioning and pressurisation systems, the second of which occurred at FL300 and prompted the declaration of a MAYDAY and an emergency descent followed by an uneventful diversion to Alicante. Doc 7030, North Atlantic (NAT) Regional Supplementary Procedures. 2.12 This procedure calls for the pilot to turn off the airway, and pilots are typically guided by company procedures as well. When an aircraft operated as acontrolled flight experiencessuddendecompression or a (similar) malfunction requiring an emergency descent,the aircraft shall, if able: a. Initiate aturnawayfromthe assigned 2.3.2 ICAO Annex 2 Rules of the Air 3.6.5.2 Communication failure. c) as soon as possible, provide separation from conflicting traffic, or issue essential traffic information, as appropriate. Depending on the circumstances, the flight crew could begin a high vertical speed descent without warning if the safety of the aircraft is at risk, which is in line with the guiding principle applied to the prioritisation of flight deck tasks:Aviate, Navigate, Communicate. On 12 September 2013, pressurisation control failed in an A320 after a bleed air fault occurred following dispatch with one of the two pneumatic systems deactivated under MEL provisions. (See Shock Cooling, below.). If structural damage is suspected, the aircraft should be flown at, or close to, the indicated airspeed (IAS) at which the failure occurred. The operator's in-flight procedures Passenger safety Carry-on baggage The minimum number of cabin crew required for each type of aeroplane The assignment of cabin crew members' emergency duties Cabin crew at emergency evacuation stations The protection of cabin crew during flight Cabin crew training programmes Equipment required on board aeroplanes On 23 August 2017, a Boeing 767-400ER which had departed Zurich for a transatlantic crossing experienced a problem with cabin pressurisation as the aircraft approached FL 100 and levelled off to run the applicable checklist. Go to top Introduction On 22 December 2010, a Finnair Airbus A330-300 inbound to Helsinki and cruising in very cold air at an altitude of 11,600 metres lost cabin pressurisation in cruise flight and completed an emergency descent before continuing the originally intended flight at a lower level. They are best used when the situation requires immediate and controlled action, such as trying to extinguish an engine fire or landing at an airport directly below you for an unforeseen pit stop. The Investigation found that although an amended non normal procedure restricting pack resets to a maximum altitude of 35000 feet had been issued almost two months earlier, it was still under review at the operator which has since amended their procedures for assessing manufacturer communications which have operational safety implications. There is no set of ready, out-of-the-box rules to be followed universally. There are various reasons why the flight crew might initiate an emergency descent. All rights reserved. 3.6 Optimal usage of radio frequency transmission time is critical in any emergency situation. On 1 June 2019, a Boeing 787-8 lost all cabin air conditioning after both packs failed less than an hour from its destination, Narita. It is expected that aircraft receiving such a broadcast will clear the specified areas and stand by on the appropriate radio frequency for further clearances from the air traffic control unit. The following is from the North Atlantic Supplement. ICAO Doc 7030 directs the following actions in the event that an aircraft experiences a sudden decompression or a (similar) malfunction requiring an emergency descent: Ensure thataltimetersare set to localQNH or QFEas appropriate. On 16 January 2013, a main battery failure alert message accompanied by a burning smell in the flight deck was annunciated as an ANA Boeing 787-8 climbed through FL320 on a domestic flight. The Investigation noted that the full consequences of blade failure had not been identified during engine / airframe type certification nor fully recognised during investigation of an identical blade failure event in 2016 which had occurred to another of the same operator s 737-700s. The Panel will be forwarding recommendations for The recent efforts of Eurocontrol and IFALPA highlight the need to adopt a somewhat more modern approach to developing emergency descent procedures. Consider; the first ATC see is an alarm on their radar that XYZ is not maintaining FL. Rapid descents dont give your ears enough time to acclimate to the higher pressure of lower altitude. The controller does not resume the responsibility for separation until certain criteria are met (the subject of another TOC paper this year). Spend most of your time looking outside, but don't forget to verify by checking your instruments every few seconds. 2.8 In high traffic density environments radio frequency congestion can become a significant factor, limiting the ability of pilots and controllers to effectively manage emergency descent operations. Emergency descents get the airplane from altitude down toward the ground at the fastest rate possible, without building up additional airspeed. In that case, the pilot must consider the potential for a traffic conflict with aircraft below and take appropriate action, because no other system participant has full knowledge of the future trajectory of the emergency aircraft. The aircraft could be ready to continue flight without any further complications after the emergency descent if no structural damage was sustained and there are no significant system malfunctions. It was found that in both incidents, both engine bleed air systems had failed to function normally because of a design fault which had allowed water within their pressure transducers to freeze. It can also involve a medical emergency for someone in the aircraft. Guidance on Economic and Financial Measures, ICAO Air Services Negotiation Event (ICAN), ICAO Guidance Material on Emergency Response and Contingency Planning. 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