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HAWK21M
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Types Of Circuit Breakers On Commericial Jets

Mon May 30, 2005 5:08 pm

What are the Types [Amperage wise & Colour coding wise] used on the Circuit Breaker [CB] panel of a Modern Commercial Aircraft.
Does it differ from Aircraft type.If so How much is the Variation.
regds
MEL
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QantasA332
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RE: Types Of Circuit Breakers On Commericial Jets

Mon May 30, 2005 6:33 pm

Perhaps the following photo will help... Big grin

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B747FE
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RE: Types Of Circuit Breakers On Commericial Jets

Tue May 31, 2005 2:50 am

Quoting HAWK21M (Thread starter):
What are the Types [Amperage wise & Colour coding wise] used on the Circuit Breaker [CB] panel of a Modern Commercial Aircraft.

Aircraft circuit breakers are normally rated from 1/2 to 100 amps, and to be used in 28VDC / 115VAC / 400HZ single or three phase circuits, bimetallic or electromagnetic type. Only trip–free/manual reset design are used in aviation.

Temperature Compensated: Permit installation of smaller gauge wire where the circuit breaker and wiring are exposed to different ambient temperatures.
Trip-Free: Can not be maintained closed even with the actuator button held in closed position.
Arc–Fault Protection: Capable of recognize arcing conditions.

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B747FE.
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HAWK21M
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RE: Types Of Circuit Breakers On Commericial Jets

Tue May 31, 2005 4:45 pm

Thanks.
How about colour coded.Normally Black but some Green & Yellow.
Im aware of painted CBs in yellow to illustrate certain critical CBs.
regds
MEL
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DC8FriendShip
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RE: Types Of Circuit Breakers On Commericial Jets

Tue May 31, 2005 10:06 pm

I believe( but not 100% sure) that all breakers must be black with white in the trip zone (push/pull only). The yellow caps generally denote breakers to be pulled on extended turns or domiciles.

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nra-3b
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RE: Types Of Circuit Breakers On Commericial Jets

Wed Jun 01, 2005 4:52 am

I've seen them painted white or yellow, and with red or yellow plastic caps. Generally the markings denote the most used circuits (as in shutting off on the ground during maintenance). The interesting part is that sometimes the paint is so thick, you can no longer read the current marking. This sucks if you have to replace a cb. You have to take the panel apart before you can order a replacement........ Or if you are just checking out a circuit to see how it is brakered.
Cheers,
Bob
 
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RE: Types Of Circuit Breakers On Commericial Jets

Wed Jun 01, 2005 5:21 am

Hawk-

I have seen a few CB's that have clip on colars for quick identification. Most that I have seen a White. If a CB is left open it will have a locking colar so the flight crews can't push it in...those are red.
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MD11Engineer
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RE: Types Of Circuit Breakers On Commericial Jets

Wed Jun 01, 2005 8:11 am

The locking collars come in all kinds of colours. At Shannon Aerospace during heavy maintenance checks each team had differently coloured locking collars with little "Remove before flight" flags, e.g. Avionics = blue, Cabin = black, Engines = red etc. .
This way, if a C/B was left pulled at the end of the check, you could easily approach whoever put them there (since so many C/Bs were pulled, written tags were impossible to use).

On the A300-600 there are two rows of marked C/Bs on the right bottom edge of the overhead C/B panel. These are the C/Bs of the so called minimum equipment rack (96VU) in the avionics bay. This shelf was seperately enclosed and fireproofed and contained the most important equipment. There was a seperate smoke detector for this rack and in case of smoke in this rack, the F/O would have to pull the marked C/Bs.

Jan
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320tech
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RE: Types Of Circuit Breakers On Commericial Jets

Wed Jun 01, 2005 11:56 am

On the A320 series, most breakers are black, but some are green. Green ones are monitored, and will display a message on the ECAM if pulled / popped. It doesn't specify which breaker, but gives a number of rows. Can't remember the exact wording of the message, but it's something like "C/B Popped Rows P-R".
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HAWK21M
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RE: Types Of Circuit Breakers On Commericial Jets

Wed Jun 01, 2005 5:51 pm

Quoting MD11Engineer (Reply 7):
At Shannon Aerospace during heavy maintenance checks each team had differently coloured locking collars with little "Remove before flight" flags, e.g. Avionics = blue, Cabin = black, Engines = red etc. .
This way, if a C/B was left pulled at the end of the check, you could easily approach whoever put them there

Very Interesting Method.Makes a lot of sense too.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
MD11Engineer
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RE: Types Of Circuit Breakers On Commericial Jets

Wed Jun 01, 2005 7:36 pm

Quoting 320tech (Reply 8):
On the A320 series, most breakers are black, but some are green. Green ones are monitored, and will display a message on the ECAM if pulled / popped. It doesn't specify which breaker, but gives a number of rows. Can't remember the exact wording of the message, but it's something like "C/B Popped Rows P-R".

Same on the A300-600, you will get an ECAM message and a light will turn on on the maintenance panel behind the F/O´s seat.

Jan
Je Suis Charlie et je suis Ahmet aussi

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