I did a search first .... but came up empty, so here we go!
After watching many videos on http://www.flightlevel350.com that were taken from the cockpits of airliners during landing, I've heard the usual "automated" voice that calls out the aircraft's altitude during short final .... you know .....
.... "Five Hundred ... Four Hundred ...Three Hundred ... Two Hundred ... One Hundred ... Fifty ... Fourty ... Thirty ... Twenty ... Ten"
Sometimes you even hear "Five!". Some aircraft also call out "Minimums". I guess it depends on the aircraft type or perhaps the pilots can select what Altitude Alerts they want.
My first question is .... are these callouts based on the Radio Altimeter for the best accuracy (which I believe they are), or are they based on the Barametric Pressure the pilots have set their regular altimeters to?
These next questions are based on a neat cockpit video taken during the repositioning flight of a Gulfstream G IV Bizjet from Van Nuys to Long Beach, California.
During short final you hear the usual altitude callouts (in a male voice), but then, after landing & during the rollout, as the G IV gets closer to the end of the runway you hear these callouts (in a female voice) ......
........ "Four Thousand Remaining" ... Three Thousand Remaining"
........ and then the pilots exit the runway before any more callouts.
My questions are ......
> Do most airliners also have automated voice callouts for the amount of runway remaining after landing? Or is this a feature that only some airliners & bizjets may have as an option?
The main reason why I'm asking about whether or not airliners typically have a Remaining Runway callout system too is because I've never heard it in any airliner cockpit videos, but, I though that could be because the airliners usually exit the runway far before the end (but not always), thus maybe the warning system wasn't activated yet.
> How does this Remaining Runway warning system work? Is it based on GPS signals, or is there a different type of equipment used that's required in both the aircraft and at the end of the runway? - for example.
> Finally, the G IV in the video vacated the runway after the 3000 feet remaining callout. If it kept on rolling out, how many more callouts would the system have to offer? For example would the pilots hear ........
..... "Two Thousand Remaining ... One Thousand Remaining ... Five Hundred Remaining" etc, etc, right down to "Ten Feet Remaining"?
Photo © Josep Manchado
PS, if you go to the flightlevel350.com website and type the word Gulfstream into the Keywords window & click on search ...... the second video down is the cockpit one I'm talking about. I didn't link the video because of Copyright Rules.
[Edited 2005-07-13 20:26:32]
[Edited 2005-07-13 20:42:40]