usairways@clt
Topic Author
Posts: 202
Joined: Sun Aug 20, 2000 1:09 am

Beacon Light Sequence

Thu Mar 22, 2001 7:48 am

Hi all,

This may seem like a wierd question, but I'll bite the bullet...

I was at the airport the other day, and while a 737 was taxiing, its beacon light was flashing, as usual. However, they werent in sync, and it seemed like they (the one on the top and the bottom of the fuselage) tended to speed up and slow down. It was like they flashed at the same time, then one on the top, one on the bottom, then it got slower, slower..finally maybe a two second pause, and they continued to flash.

Why don't they just flash together?

Thanks.
Zach
 
chdmcmanus
Posts: 372
Joined: Wed Mar 21, 2001 12:53 am

RE: Beacon Light Sequence

Thu Mar 22, 2001 8:46 am

Most strobe systems have a power supply for each strobe. This creates system redundancy and actually eliminates some wiring. Since most power supplies also contain the keyer some strobes will flash differently than others.
"Never trust a clean Crew Chief"
 
242
Posts: 495
Joined: Tue Oct 24, 2000 1:10 pm

RE: Beacon Light Sequence

Fri Mar 23, 2001 3:02 pm

As stated, the beacons each have their own power supply, and over time the electronic components in each power supply degrade causing the beacons to flash slower. In fact, they're usually tested while the aircraft is in C check. They must flash at least X times a minute to be considered serviceable.

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