emergency descend vs rapid descend
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Join Date: Jul 2009
Location: abu dhabi
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thanks pontius and DFC for the additional infos... FCheng, will definitely try it on my next visit to the sim... thats why they ask us to fine tune and crosscheck what we've set up for the descend...
Join Date: Feb 2010
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Hi ALL,
Emergency Descent only as procedure is not a Distress, so you cannot use the signal MAYDAY. Emergency Descent is an Urgency, for that reason you must used the signal PAN PAN PAN. Obviously, if you have to carry out an Emergency Descent due to an engine failure because of an explosion inside engine followed with decompression and hydraulic failure…you need to use MAYDAY MAYDAY MAYDAY
According to ICAO DOC 7030 when an aircraft operated as a controlled flight experiences sudden decompression or a (similar) malfunction requiring an emergency descent, the aircraft shall if able:
1. Initiate a turn away from the assigned route or track before commencing the emergency descent;
2. Advise the appropriate air traffic control unit as soon as possible of the emergency descent;
3. Set transponder Code to 7700 and select the Emergency Mode on the automatic dependent surveillance/controller pilot data link communications (ADS/CPDLC) system, if applicable;
4. Turn on exterior lights;
5. Watch for conflicting traffic both visually and by reference to ACAS (if equipped) and;
6. Coordinate its further intentions with the appropriate ATC unit.
Keeping in mind that the aircraft shall not descend below the lowest published minimum altitude which will provide a minimum vertical clearance of 300m (1000ft) or in designated mountainous terrain 600m (2000ft) above all obstacles located in the area specified.
* Personal note: In an Emergency Descent as number 7. I would switch ON Engine Anti-Ice because you could be very busy to realize that you are in icing conditions (specially performing an Emergency Descent during nights)
Finally, according to some planes if available, Speed Brakes have to be used to carry out and Emergency Descent, IF NOT, you cannot develop an Emergency Descent properly, Can you? The question about Structural Damage Known or Suspected, well it must be answered after using the Speed Brake. If the answer is Yes, you may dictate more conservative speed profiles or entry maneuvers, but you need Speed Brake to descend (drag)
In a rapid descent, which is a normal procedure, you should use the Speed Brake if available.
About the whole procedure in an Emergency Descent, you have to check your FCOM and QRH
Regards.
Emergency Descent only as procedure is not a Distress, so you cannot use the signal MAYDAY. Emergency Descent is an Urgency, for that reason you must used the signal PAN PAN PAN. Obviously, if you have to carry out an Emergency Descent due to an engine failure because of an explosion inside engine followed with decompression and hydraulic failure…you need to use MAYDAY MAYDAY MAYDAY
According to ICAO DOC 7030 when an aircraft operated as a controlled flight experiences sudden decompression or a (similar) malfunction requiring an emergency descent, the aircraft shall if able:
1. Initiate a turn away from the assigned route or track before commencing the emergency descent;
2. Advise the appropriate air traffic control unit as soon as possible of the emergency descent;
3. Set transponder Code to 7700 and select the Emergency Mode on the automatic dependent surveillance/controller pilot data link communications (ADS/CPDLC) system, if applicable;
4. Turn on exterior lights;
5. Watch for conflicting traffic both visually and by reference to ACAS (if equipped) and;
6. Coordinate its further intentions with the appropriate ATC unit.
Keeping in mind that the aircraft shall not descend below the lowest published minimum altitude which will provide a minimum vertical clearance of 300m (1000ft) or in designated mountainous terrain 600m (2000ft) above all obstacles located in the area specified.
* Personal note: In an Emergency Descent as number 7. I would switch ON Engine Anti-Ice because you could be very busy to realize that you are in icing conditions (specially performing an Emergency Descent during nights)
Finally, according to some planes if available, Speed Brakes have to be used to carry out and Emergency Descent, IF NOT, you cannot develop an Emergency Descent properly, Can you? The question about Structural Damage Known or Suspected, well it must be answered after using the Speed Brake. If the answer is Yes, you may dictate more conservative speed profiles or entry maneuvers, but you need Speed Brake to descend (drag)
In a rapid descent, which is a normal procedure, you should use the Speed Brake if available.
About the whole procedure in an Emergency Descent, you have to check your FCOM and QRH
Regards.
