Koopas From United States of America, joined Oct 1999, 172 posts, RR: 2 Posted (14 years 6 months 6 days 20 hours ago) and read 20589 times:
I was reading through the audio transcript of the last minutes of Swissair 111 and I had a few questions regarding the procedures in declaring an emergency. I hope it is appropriate for me to post this.
I was just wondering under what circumstances does one a crew issue a "Pan, Pan, Pan" vs. a "Mayday" call. Also, does a pilot have to "declare an emergency" formally at that point?
Why does the pilot say "Swissair 111 Heavy"...why the "heavy" part?
Krs From , joined Dec 1969, posts, RR:
Reply 1, posted (14 years 6 months 6 days 19 hours ago) and read 20476 times:
PAN PAN ( expressed 3 times ) is an indication from the crew that some urgent situation has showed up. That can be a pass. who has become serious ill so the flight have to be diverted to a nearby suitable airport where medical care can be obtained. When a PAN PAN - message is sent, there's no immediate danger for the safety of the pass., crew or aircraft.
MAYDAY ( also expressed 3 times ), on the other side, is and indication of a dangerous situation has risen and immediate action is needed to try to save pass., crew and aircraft. All other traffic in the area are obliged to assist if possible. The aircraft that sent the MAYDAY - message will be given absolute priority and other aircraft aware of the situation are obliged to maintain radiosilence as long as the situation is critical and the distress situation has not been ended.
There is nothing called "decleare an emergency". When someone make a MAYDAY - call they ARE in an emergency and all needed action in relation to the emergency shall be taken care of by ATC or other aircraft if needed.
And finally the term "heavy" after callsign is, as far as I know, just an indication to ATC that the aircraft is heavy loaded and separation have to be according to that.
Hope this was some kind of answer to your questions!!
Phil330 From Australia, joined May 2011, 0 posts, RR: 0
Reply 4, posted (14 years 6 months 6 days 4 hours ago) and read 20424 times:
Just a quick response here,
A 'PAN' call is a situation of URGENCY whereby a condition concerning the safety of an aircraft or of some person on board (or within sight) exists. However, the situation does not require immediate assistance
A 'MAYDAY' call is a situation of DISTRESS whereby the condition of the aicraft is being threatened by serious and/or imminent damger which requires immediate assistance.
The 'Heavy' part of a callsign (which comes at the end, e.g. United 256 Heavy) signifies that the aircraft comes under the wake turbulence category of 'heavy' rather than 'medium' or 'light'. This allows the controller to quickly know the limitations as to how much separation is needed between aircraft. 'Heavy' aircraft are those like the A300/A310, 747s, Most 767s, etc... The number of engines is not taken into account, just the MTOW.
Finally, as far as I am aware, the 'Heavy' callsign extension is only used in the USA. If anyone knows of anywhere else it is used I'd be interested to know, but for our airline's operations we use it only in US Airspace.
Purdue Cadet From , joined Dec 1969, posts, RR:
Reply 6, posted (14 years 6 months 6 days ago) and read 20416 times:
As we have discussed time and again, the "heavy" designator means that the aircraft is certificated with a maximum gross weight of 255,000 pounds or more, regardless of its weight on any given flight or at any given time during a flight.
Canadian747400 From , joined Dec 1969, posts, RR:
Reply 7, posted (14 years 6 months 5 days 23 hours ago) and read 20409 times:
The callsign "Heavy" is also used in Canada, and I think it means the aircraft weighs between 250,000 and 300,000 pounds or more. (I was looking this up in a few books, and each seems to give a different weight, but most are around that).
Iainhol From , joined Dec 1969, posts, RR:
Reply 9, posted (14 years 6 months 5 days 9 hours ago) and read 20396 times:
They did not delcare a mayday which is surprising that is why I think they knew where the smoke was coming from. That is also why they where taking there time getting of fuel rather then landing over weight.