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Squak 7700 And Not Diverting?  
User currently offlinekl911 From Czech Republic, joined Jul 2003, 5131 posts, RR: 12
Posted (3 years 2 weeks 5 days 9 hours ago) and read 12416 times:

Right now BA48 SEA - LHR is squaking 7700 NW of MAN. FL370 . But for at least the last 7 minutes it remains on course and altitude. What could be a reason for a 7700 squak while continuing to your destination?

http://www.flightradar24.com/BAW48

Thanks,

KL911

17 replies: All unread, jump to last
 
User currently offlinewilco737 From Greenland, joined Jun 2004, 8992 posts, RR: 76
Reply 1, posted (3 years 2 weeks 5 days 9 hours ago) and read 12381 times:
AIRLINERS.NET CREW
HEAD MODERATOR

Quoting kl911 (Thread starter):
Right now BA48 SEA - LHR is squaking 7700 NW of MAN. FL370 . But for at least the last 7 minutes it remains on course and altitude. What could be a reason for a 7700 squak while continuing to your destination?

It always depends on the source of emergency. The flight to LHR is only a couple of minutes longer and maybe they can expect better help there. Or the emergency is not that severe so that they can continue to LHR.

wilco737
  



It it's not Boeing, I am not going.
User currently offlinekl911 From Czech Republic, joined Jul 2003, 5131 posts, RR: 12
Reply 2, posted (3 years 2 weeks 5 days 9 hours ago) and read 12347 times:

Quoting wilco737 (Reply 1):
It always depends on the source of emergency. The flight to LHR is only a couple of minutes longer and maybe they can expect better help there. Or the emergency is not that severe so that they can continue to LHR.

Thanks Wilco737,

Good to have some experts here.   I was under the impression that 7700 was only used in a such emergencies where immediately landing was required.


User currently offlinekl911 From Czech Republic, joined Jul 2003, 5131 posts, RR: 12
Reply 3, posted (3 years 2 weeks 5 days 9 hours ago) and read 12337 times:

Indeed no holding area, immediate cleared for a 27 landiing. Over London now.

User currently offlineBrouAviation From Netherlands, joined Jun 2009, 985 posts, RR: 1
Reply 4, posted (3 years 2 weeks 5 days 9 hours ago) and read 12337 times:

Quoting kl911 (Thread starter):

I guess that the ToD for this route is actually quite close to MAN, so making a circling descent into MAN or a straight descent to LHR doesn't make much difference, other than it saves you a lot of trouble in getting the pax and aircraft from MAN to LHR afterwards.



Never ask somebody if he's a pilot. If he is, he will let you know soon enough!
User currently offlinewilco737 From Greenland, joined Jun 2004, 8992 posts, RR: 76
Reply 5, posted (3 years 2 weeks 5 days 9 hours ago) and read 12325 times:
AIRLINERS.NET CREW
HEAD MODERATOR

Quoting kl911 (Reply 2):
I was under the impression that 7700 was only used in a such emergencies where immediately landing was required.

Generally yes. But the crew can decide if it makes more sense to fly direct to LHR and land there or dive down to MAN and maybe come in too high and then go around.
The flight to LHR is only a couple minutes longer and if they are already close to MAN it maybe a straight in descend towards LHR where they mabe are a little too high for MAN already and would need to do a circle.

wilco737
  



It it's not Boeing, I am not going.
User currently offlinekl911 From Czech Republic, joined Jul 2003, 5131 posts, RR: 12
Reply 6, posted (3 years 2 weeks 5 days 9 hours ago) and read 12325 times:

Lined up for 27R, all other landings used 27L. Is 27R longer?

User currently offlineBrouAviation From Netherlands, joined Jun 2009, 985 posts, RR: 1
Reply 7, posted (3 years 2 weeks 5 days 9 hours ago) and read 12295 times:

Quoting kl911 (Reply 6):

Lined up for 27R, all other landings used 27L. Is 27R longer?

Yep it is.



Never ask somebody if he's a pilot. If he is, he will let you know soon enough!
User currently offlinekl911 From Czech Republic, joined Jul 2003, 5131 posts, RR: 12
Reply 8, posted (3 years 2 weeks 5 days 9 hours ago) and read 12295 times:

As I type this AA19 CDG-DFW declared 7700. Was over Guernsey and is returning to Paris it seems. What is happening today??

User currently offlinewilco737 From Greenland, joined Jun 2004, 8992 posts, RR: 76
Reply 9, posted (3 years 2 weeks 5 days 9 hours ago) and read 12278 times:
AIRLINERS.NET CREW
HEAD MODERATOR

Quoting kl911 (Reply 8):
As I type this AA19 CDG-DFW declared 7700. Was over Guernsey and is returning to Paris it seems. What is happening today??

Well, it is 2 airplanes today. I guess there are many over the world, but not all make the a.net news 

wilco737
  



It it's not Boeing, I am not going.
User currently offlinefcogafa From United Kingdom, joined May 2008, 784 posts, RR: 0
Reply 10, posted (3 years 2 weeks 5 days 8 hours ago) and read 12093 times:

Pilots overuse that code. Often it is due to a sick pax.

why LHR and not MAN?

Airlines like their airplanes at their bases....


User currently offlinewilco737 From Greenland, joined Jun 2004, 8992 posts, RR: 76
Reply 11, posted (3 years 2 weeks 5 days 8 hours ago) and read 12056 times:
AIRLINERS.NET CREW
HEAD MODERATOR

Quoting fcogafa (Reply 10):
Pilots overuse that code.

Overuse?   

Quoting fcogafa (Reply 10):
Often it is due to a sick pax.

So a sick passenger who needs immediate medical care is no emergency?   

wilco737
  



It it's not Boeing, I am not going.
User currently offlineSPREE34 From United States of America, joined Jun 2004, 2246 posts, RR: 9
Reply 12, posted (3 years 2 weeks 5 days 6 hours ago) and read 11839 times:

Quoting fcogafa (Reply 10):
Pilots overuse that code.

If the radio frequency is busy, this is a good way to get ATC attention.



I don't understand everything I don't know about this.
User currently offlineLondoncenter From United Kingdom, joined Feb 2004, 108 posts, RR: 0
Reply 13, posted (3 years 2 weeks 5 days 6 hours ago) and read 11814 times:

The squawk is often instructed by ATC as it breaks through all height filters used on the radar screens (or at least it does here in the UK). Filters are often used in busy airspace so that flights above and below a particular sector are not fully displayed therefore de-cluttering the radar image.

By selecting the 7700 it allows ATC units/sectors below the aircraft, or those still ahead in its planned route, to see the aircraft has declared some sort of emergency and plan accordingly. For example if the aircraft needs to start a descent immediately it is not always possible for a sector beneath to be informed before the aircraft descends into it, the squawk acts as a "heads-up, keep a look out" just in case this should happen, or at the very least prepares you for phone calls regarding diversions etc. Should the aircraft opt to continue to destination then it allows those sectors still to work the aircraft the ability to plan ahead for an expedited approach etc.

The declaring of a PAN is quite often associated with a continuation to destination and should attract the 7700 squawk. MAYDAY is more serious and generally means there is a direct and/or imminent threat to the safety of the aircraft (such as smoke/fire etc) which would almost certainly result in landing at the nearest aerodrome.


User currently offlinekl911 From Czech Republic, joined Jul 2003, 5131 posts, RR: 12
Reply 14, posted (3 years 2 weeks 5 days 3 hours ago) and read 11536 times:

Quoting Londoncenter (Reply 13):
The declaring of a PAN is quite often associated with a continuation to destination and should attract the 7700 squawk. MAYDAY is more serious and generally means there is a direct and/or imminent threat to the safety of the aircraft (such as smoke/fire etc) which would almost certainly result in landing at the nearest aerodrome.

Thank you for your detailed answer. Just to be clear, PAN and MAYDAY both use 7700?


User currently offlineSPREE34 From United States of America, joined Jun 2004, 2246 posts, RR: 9
Reply 15, posted (3 years 2 weeks 4 days 22 hours ago) and read 9529 times:

Quoting Londoncenter (Reply 13):

The squawk is often instructed by ATC as it breaks through all height filters used on the radar screens (or at least it does here in the UK).

Same in US. Geee, what I've forgotten in retirement.



I don't understand everything I don't know about this.
User currently offlineLondoncenter From United Kingdom, joined Feb 2004, 108 posts, RR: 0
Reply 16, posted (3 years 2 weeks 4 days 19 hours ago) and read 8345 times:

Quoting kl911 (Reply 14):
Thank you for your detailed answer. Just to be clear, PAN and MAYDAY both use 7700?

Yes, both attract the 7700. Sometimes pilots are reluctant to declare the actual words over the radio (possibly a reputation issue...?) and can be instructed to select the squawk anyway to assist ATC planning, although this is quite rare in my experience.


User currently offlineyodobashi From UK - Scotland, joined Sep 2007, 236 posts, RR: 3
Reply 17, posted (3 years 2 weeks 4 days 14 hours ago) and read 7124 times:

Quoting fcogafa (Reply 10):
why LHR and not MAN?

Airlines like their airplanes at their bases....

Yes, airlines do like their bases (especially BA who have pretty much only a domestic feeder network outside London), but as previously explained, at FL370 over EGCC, it was easily as quick to continue to EGLL (only around 150 miles) to descend from that altitude as it would have been to circle down into EGCC.



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