Transponder selection???
Thread Starter
Join Date: Aug 2002
Location: Wales
Posts: 19
Likes: 0
Received 0 Likes
on
0 Posts
Transponder selection???
During my commercial flying training I was taught to select the transponder to standby when changing squawk in case I selected an emergency code an set your alarm bells a ringing.
Once I got into my airline they tell me I dont need to do this as there is around a three second time delay in modern transponders to prevent such panic/saves us selecting stanby.
An F/O mentioned the other day that he had been told we need to select standby when changing now because ,as we scroll through the squawks, we could activate other peoples flight plans well before they got off the ground....does this ring any bells?
Once I got into my airline they tell me I dont need to do this as there is around a three second time delay in modern transponders to prevent such panic/saves us selecting stanby.
An F/O mentioned the other day that he had been told we need to select standby when changing now because ,as we scroll through the squawks, we could activate other peoples flight plans well before they got off the ground....does this ring any bells?
Watchdog Delta Hotel
Join Date: Aug 2002
Location: here but there in 6 years
Posts: 128
Likes: 0
Received 0 Likes
on
0 Posts
transponder select
filt
your original training is much better than your company stuff
you are correct if scrolling thru you could cause mayday(flash)etc but starting flights maybe but highley unlikley
always do standby first please
regrds
mainecoon
your original training is much better than your company stuff
you are correct if scrolling thru you could cause mayday(flash)etc but starting flights maybe but highley unlikley
always do standby first please
regrds
mainecoon
Beady Eye
Join Date: Feb 2001
Location: UK
Posts: 1,495
Likes: 0
Received 0 Likes
on
0 Posts
Filtonman
Standby please. You are correct on both counts. Its possible to have the radars detect 7700 but the most frequent occurence is for the UK's Flight Data processing system to pair your incorrect squawk with a different a/c. Happens quite a lot unfortunately.
Thanks for asking the question.
Thanks for asking the question.
Join Date: Oct 1999
Posts: 47
Likes: 0
Received 0 Likes
on
0 Posts
It takes two (or three?) rotations of the radar to cause the problems mentioned. Local airport radars whizz around at about 15 RPM (area radars are slower) so long as you select the digits within about 8 secs then you are OK.
Join Date: Feb 2001
Location: UK
Posts: 588
Likes: 0
Received 0 Likes
on
0 Posts
I flew in a TB20 a few months back with a digital Tranponder that doesn't start transmitting until you've entered and verified the new 4 digit code, hence no need to select standby...if that sort of gizmo is fitted to a tiddler, it may also be on your flight deck?
Join Date: Nov 2000
Location: Greystation
Posts: 1,086
Likes: 0
Received 0 Likes
on
0 Posts
regularly we get 'scrollers' setting off the emergency codes, and once I got a time update on an a/c scrolling through a previously assigned code that caused computer message to be sent to Paris an HOUR early. I'd agree with DEFINATELY selecting standby first.