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Why 747 Nose Gear Light Trun Off At Take Off?  
User currently offline747400sp From United States of America, joined Aug 2003, 3624 posts, RR: 2
Posted (6 years 2 weeks 3 days ago) and read 5892 times:

Most planes nose gear is almost always on, but 747's nose light turn off at rotate and do not come on till touch down. I have notest that 747's do not land with there nose light on like other a/c since the early 90's maybe 80's, but the first time I notest that there nose gear light turn off at rotate, was during the take off scene in the movie Drop Zone. So could somebody tell me why 747 do this?


PS: My father told me Pan Am 747 use to turn there nose gear light on right before touch down, is this true.

9 replies: All unread, jump to last
 
User currently offlineKcrwFlyer From United States of America, joined May 2004, 3817 posts, RR: 7
Reply 1, posted (6 years 2 weeks 3 days ago) and read 5881 times:

I'm thinking it has to do with the angle of the light, and the angle youre viewing the aircraft from.

User currently offlineJetMech From Australia, joined Mar 2006, 2699 posts, RR: 53
Reply 2, posted (6 years 2 weeks 2 days 22 hours ago) and read 5849 times:



Quoting 747400sp (Thread starter):

The landing lights on the nosegear are able to be manually switched by the crew. IIRC, even if the lights are left on, they automatically switch off when the nosegear retracts. As far as I know, this is done by a simple rotary contact mechanism down in the nosegear wheel well itself.

Regards, JetMech



JetMech split the back of his pants. He can feel the wind in his hair.
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 3, posted (6 years 2 weeks 2 days 15 hours ago) and read 5776 times:



Quoting JetMech (Reply 2):
even if the lights are left on, they automatically switch off when the nosegear retracts.

Its exactly that way on the B757.
regds
MEL



Think of the brighter side!
User currently offlineJetMech From Australia, joined Mar 2006, 2699 posts, RR: 53
Reply 4, posted (6 years 2 weeks 2 days 10 hours ago) and read 5689 times:

Quoting HAWK21M (Reply 3):

I see. Talking about lights, I was observing a 737 NG approaching runway 16R at SYD this afternoon. The two lights under the fuselage were exhibiting a strange behaviour. As far as I could tell, they were alternately switching on and off. If I was not actually seeing things, why do these particular lights perform this switching pattern   .



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Regards, JetMech

[Edited 2008-09-06 09:17:23]


JetMech split the back of his pants. He can feel the wind in his hair.
User currently offlineCorey07850 From United States of America, joined Feb 2004, 2527 posts, RR: 5
Reply 5, posted (6 years 2 weeks 2 days 9 hours ago) and read 5671 times:



Quoting JetMech (Reply 4):
I see. Talking about lights, I was observing a 737 NG approaching runway 16R at SYD this afternoon. The two lights under the fuselage were exhibiting a strange behaviour. As far as I could tell, they were alternately switching on and off. If I was not actually seeing things, why do these particular lights perform this switching pattern .

You aren't seeing things... Seems in the last few years the alternating landing light has been getting more popular. I see it a lot on corporate aircraft and occasionally on airlines. It's supposed to increase visibility as well as possibly aiding in scaring off birds


User currently offlineJetMech From Australia, joined Mar 2006, 2699 posts, RR: 53
Reply 6, posted (6 years 2 weeks 2 days 9 hours ago) and read 5664 times:



Quoting Corey07850 (Reply 5):
It's supposed to increase visibility as well as possibly aiding in scaring off birds

I see. I was actually reminded of an emergency vehicle when I was watching the 737 this afternoon. It's good to know I wasn't seeing things. I was actually thinking that the lights were on all the time, and that it was the regular passage through small areas of cloud that were making the lights blink! The regular nature of the blinking should have made me reject this explanation immediately  blush  !

Regards, JetMech



JetMech split the back of his pants. He can feel the wind in his hair.
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 7, posted (6 years 2 weeks 2 days 8 hours ago) and read 5657 times:



Quoting JetMech (Reply 4):
As far as I could tell, they were alternately switching on and off. If I was not actually seeing things, why do these particular lights perform this switching pattern

Those are varying intensity landing lights....Increase the life of the filament & are visible a greater distance away due to its flashing.

regds
MEL



Think of the brighter side!
User currently offlineFr8mech From United States of America, joined Sep 2005, 5452 posts, RR: 14
Reply 8, posted (6 years 2 weeks 2 days 7 hours ago) and read 5635 times:

The runway turnoff lights are controlled by a switch in the cockpit and by the nose gear squat switch. If the switch in the cockpit is left on, the lights will go out as soon as the aircraft nose gear breaks ground.

I can only assume this is to reduce crew workload on take-off. Leaving those lights on as the gear retracts will greatly shorten their life.

Near as I can recall, the B757/B767 work in similar fashion, nose gear landing lights included, though I think the switching is down through the down lock for the landing lights.



When seconds count...the police are minutes away.
User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 9, posted (6 years 2 weeks 2 days 3 hours ago) and read 5558 times:



Quoting Fr8mech (Reply 8):
the lights will go out as soon as the aircraft nose gear breaks ground

That would be an air-grd sense if not mistaken.Then thats different from the B757.

Quoting Fr8mech (Reply 8):
Near as I can recall, the B757/B767 work in similar fashion, nose gear landing lights included, though I think the switching is down through the down lock for the landing lights.

On the B757...gear up , taxi light off,gear down & aircraft in air, the Taxi light will function dim,gear down & Aircraft on ground.the taxi light will be at full illumination.

regds
MEL



Think of the brighter side!
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