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Beacon Light Sequence  
User currently offlineUsairways@clt From United States of America, joined Aug 2000, 209 posts, RR: 3
Posted (15 years 2 months 1 week 9 hours ago) and read 1905 times:

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?


2 replies: All unread, jump to last
User currently offlineChdmcmanus From United States of America, joined Mar 2001, 374 posts, RR: 2
Reply 1, posted (15 years 2 months 1 week 8 hours ago) and read 1855 times:

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"
User currently offline242 From United States of America, joined Oct 2000, 498 posts, RR: 0
Reply 2, posted (15 years 2 months 6 days 2 hours ago) and read 1814 times:

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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