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757/67 Indicator Lights Question  
User currently offlineTaguilo From Argentina, joined Aug 2005, 74 posts, RR: 0
Posted (8 years 3 months 1 week 2 days 22 hours ago) and read 1940 times:

Hi all,

I have some questions about indicator lights on the 757 (and/or 67)

1) Does BATT BUS power ALL indicator lights (except Batt OFF and right Utility Off), or there are some powered by other buses? (for example, Fuel Pumps OFF lights, or Hyd Pumps OFF lights, Window Heat Off Lights, etc)

2) In case other buses do power indicator lights, which ones are powered by which buses?

3) Each time a generator (Left/Right/APU or ExtPwr) comes on line, CRTs and instrument lights tied to Main AC buses blink for some milliseconds. Do indicator lights blink as well, even if not tied to main AC buses?

Many Thanks
Tom

3 replies: All unread, jump to last
 
User currently offlineFr8Mech From United States of America, joined Sep 2005, 5358 posts, RR: 14
Reply 1, posted (8 years 3 months 1 week 2 days 19 hours ago) and read 1918 times:

Different busses power the various lights. There are too many lights for me to reliably recall which are powered by which buss.

Quoting Taguilo (Thread starter):
Do indicator lights blink as well, even if not tied to main AC buses?

I honestly can't recall, but I'm almost sure they don't. We are trained to check the starter light at cut-off, which is right about when the genrator assumes responsibiity for the buss. The starter light does not blink, nor does the standby engine indicator show any sign of power loss.



When seconds count...the police are minutes away.
User currently offlineHAWK21M From India, joined Jan 2001, 31667 posts, RR: 56
Reply 2, posted (8 years 3 months 1 day 21 hours ago) and read 1764 times:

Quoting Taguilo (Thread starter):
Each time a generator (Left/Right/APU or ExtPwr) comes on line, CRTs and instrument lights tied to Main AC buses blink for some milliseconds. Do indicator lights blink as well, even if not tied to main AC buses?

No.The Indicator lights do not flicker.
regds
MEL



Think of the brighter side!
User currently offlineTaguilo From Argentina, joined Aug 2005, 74 posts, RR: 0
Reply 3, posted (8 years 3 months 1 day 16 hours ago) and read 1735 times:

Thank you George & Mel.

Now, could you tell me whether Fuel Pumps PRESS lights (757) illuminate when the a/c is cold and dark, and the BATT is switched ON? As those pumps are tied to Main AC buses, I understand their indicator lights are tied the same as well?

Tom


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