Two questions
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Join Date: Jan 2008
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Two questions
Hello all, two questions, perhaps the wrong forum if so mods feel free to move...
1. I was in SFO a couple of days ago, and saw a ANA either a 767 or 777, as the gear was being retracted i saw "smokepuffs" from the maingear, is this the brakes being applied before stowage? is it made automaticlly or bye the crew?
2. where does inflight "moving maps/flightinfo (speed, alltitude, head/tailwind, ETA) system get its info from, is it a stand alone system or has it got a link to the FMS? I guess there is a lot of different systems for this but feel free to tell about the once you know about...
Regards
Raffi
1. I was in SFO a couple of days ago, and saw a ANA either a 767 or 777, as the gear was being retracted i saw "smokepuffs" from the maingear, is this the brakes being applied before stowage? is it made automaticlly or bye the crew?
2. where does inflight "moving maps/flightinfo (speed, alltitude, head/tailwind, ETA) system get its info from, is it a stand alone system or has it got a link to the FMS? I guess there is a lot of different systems for this but feel free to tell about the once you know about...
Regards
Raffi
1. I can't answer for the 777, but on the 767 the brakes are applied automatically during the retraction sequence. But that should not produce puffs of smoke.
2. The pax display systems I know of take their position and flight data info from the FMS and other flight deck sources -e.g. air data computer for speed & altitude. As all the data required is already present, there's little point in adding an independent source just for cabin display.
2. The pax display systems I know of take their position and flight data info from the FMS and other flight deck sources -e.g. air data computer for speed & altitude. As all the data required is already present, there's little point in adding an independent source just for cabin display.
Usual disclaimers apply!
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The puff of 'smoke' comes from the hydraulic system ADP as it cuts in to augment the electric pump. The turbine drive unit is located aft of the wing on the left hand side behind the wing/body fairing.
I've noticed a similar 'puff of smoke' from A330s as the gear is selected up.
The autobrakes apply when the gear is selected up to stop the wheels before the retraction sequence starts so there are no gyroscopic forces to deal with as the undercarriage legs rotate inwards.
Used to do the brakes on/off on the MB326 before gear up during my pilot training in the RAAF for the same reason.
Regards,
BH.
The autobrakes apply when the gear is selected up to stop the wheels before the retraction sequence starts so there are no gyroscopic forces to deal with as the undercarriage legs rotate inwards.
Used to do the brakes on/off on the MB326 before gear up during my pilot training in the RAAF for the same reason.
Regards,
BH.
Join Date: May 2008
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I have a couple of supplementary questions on pax nav displays:
1.Who chooses the place names to be included. For example I wouldn't expect St Peters Port Guernsey to be a major Hub.
2.The rather big aircraft(BA that is). I presume that the longitudinal axis represents heading, but where is the actual location on the map---s it the nose or at about the quarter chord point?
Keith
1.Who chooses the place names to be included. For example I wouldn't expect St Peters Port Guernsey to be a major Hub.
2.The rather big aircraft(BA that is). I presume that the longitudinal axis represents heading, but where is the actual location on the map---s it the nose or at about the quarter chord point?
Keith
Only half a speed-brake
