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HAWK21M
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APU/Engine Fire Extinguisher Type

Wed Apr 23, 2008 11:08 am

Apart from foam/Dry powder/ire Halon Fire Extinguishers availability for APU/Engine Fire extinguishers.Are there any other types in use in commercial Aviation these days?

regds
MEL.
I may not win often, but I damn well never lose!!! ;)
 
Buzz
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RE: APU/Engine Fire Extinguisher Type

Wed Apr 23, 2008 12:53 pm

Hi MEL, Buzz here. I don't know that other airplanes use dry chemical or foam as an on-board extinguisher. Both seem to make a mess... and maybe they don't flow /blow into the areas that need extinguishing.

On a DC-3 I used to Crew Chief there was a large C02 bottle aft and outboard of the copilot's seat for one-shot engine fire extinguishing. There was only one shot on that airplane. Another DC-3 I've worked on and flown with had a bottle in each nacelle and another for the cabin heater. Periodically we would weigh the bottles to see if they leaked and became lighter.

g'day
 
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HAWK21M
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RE: APU/Engine Fire Extinguisher Type

Wed Apr 23, 2008 5:32 pm



Quoting Buzz (Reply 1):
Periodically we would weigh the bottles to see if they leaked and became lighter.

Reminds me of the toilet 10gm Fire Extinguisher on the B737s.  Smile
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
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jetmech
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RE: APU/Engine Fire Extinguisher Type

Thu Apr 24, 2008 12:20 am



Quoting HAWK21M (Thread starter):



Quoting Buzz (Reply 1):

I have seen small water extinguishers on commercial aircraft.

Regards, JetMech
JetMech split the back of his pants. He can feel the wind in his hair :shock: .
 
ex52tech
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RE: APU/Engine Fire Extinguisher Type

Thu Apr 24, 2008 2:38 am



Quoting Buzz (Reply 1):
Periodically we would weigh the bottles to see if they leaked and became lighter.



Quoting HAWK21M (Reply 2):
Reminds me of the toilet 10gm Fire Extinguisher on the B737s

We had to weigh the engine, and APU fire bottles (halon) during major checks, and usually replaced the squibs.

I can not recall a foam extinguisher on an APU in any airplane I have worked in.....which one uses one.

The only dry chemical extinguisher I came in contact with on an APU was on the KC-135A, with the APU inside the cabin.
If you had the access covers off of that unit, you made sure you had the extinguisher breaker pulled. If you accidentally grounded one of the probes..........POW..........you got the white face look.
"Saddest thing I ever witnessed....an airplane being scrapped"
 
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HAWK21M
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RE: APU/Engine Fire Extinguisher Type

Thu Apr 24, 2008 11:17 am



Quoting JetMech (Reply 3):
I have seen small water extinguishers on commercial aircraft.

The Pressurised Cartridge rotating handle type,The liquid would be treated to prevent High altitude freezing.  Smile

Quoting Ex52tech (Reply 4):
We had to weigh the engine, and APU fire bottles (halon) during major checks, and usually replaced the squibs.

What if they have Pressure gauges,then weight check is not called for.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
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jetmech
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RE: APU/Engine Fire Extinguisher Type

Fri Apr 25, 2008 5:33 am



Quoting HAWK21M (Reply 5):
The Pressurised Cartridge rotating handle type,The liquid would be treated to prevent High altitude freezing.

That's the ones. I stuffed up and did not comprehend your question fully. I see you were talking about APU or Engine extinguishers only. I have only seen the water type in the cabin  blush . I dare say you would need something more effective than water for an engine fire!

Regards, JetMech
JetMech split the back of his pants. He can feel the wind in his hair :shock: .
 
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HAWK21M
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RE: APU/Engine Fire Extinguisher Type

Fri Apr 25, 2008 8:39 am



Quoting JetMech (Reply 6):
I have only seen the water type in the cabin

In the Cabin,We have the Water type & the Halon type.With Freighters the numbers are reduced though.

regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
ex52tech
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RE: APU/Engine Fire Extinguisher Type

Sat Apr 26, 2008 2:29 pm



Quoting HAWK21M (Reply 5):
What if they have Pressure gauges,then weight check is not called for

I can't recall having worked with an engine or APU fire bottle that had a pressure gage. But it is early, and I haven't had my coffee yet.
 scratchchin 

Most I have worked around had a disk on the fuselage, or engine pylon that blew out if they were used.

They didn't even equip the B-52, in any model, with engine fire bottles. The KC135A model did not have fire bottles for the engines either, the other models of the 135 I can not speak for.

I witnessed one blazing engine fire on a 135A one day, they could have used some fire bottles. The #1engine caught fire right at rotation, and he flew around dumping fuel out of the boom while the fire was burning off the contents of the oil tank after it had burned through the oil lines. To add insult to injury, when the airplane rolled to a stop at the end of the runway, a newbie fireman ran out and buried a fire axe in the nose cowl, ruined a perfectly good nose cowl. Then for an encore, the crew left the battery switches on when they evacuated, and the fuel gravity feed to the aft fuel tank, which caused the aircraft to come crashing down on the refueling boom. Wish I had a camera for that one.
"Saddest thing I ever witnessed....an airplane being scrapped"
 
411A
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RE: APU/Engine Fire Extinguisher Type

Sat Apr 26, 2008 4:09 pm

The fire extinguishing chemical first used in turbine applications was developed quite a long time ago, and is still used on some aircraft...monobromotrifluoralmenthane.
 
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HAWK21M
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RE: APU/Engine Fire Extinguisher Type

Sat Apr 26, 2008 6:46 pm



Quoting Ex52tech (Reply 8):
I can't recall having worked with an engine or APU fire bottle that had a pressure gage.

Trust me there are.I've seen them on the B732s.
regds
MEL
I may not win often, but I damn well never lose!!! ;)
 
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IFixPlanes
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RE: APU/Engine Fire Extinguisher Type

Sun Apr 27, 2008 8:25 am

I thrust the AMM... (B737NG)



never tell an engineer he is wrong ;-)
 
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jetmech
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RE: APU/Engine Fire Extinguisher Type

Sun Apr 27, 2008 9:11 am



Quoting IFixPlanes (Reply 11):

Nice pictures! Pretty much all the fire-bottles I have dealt with were sealed spheres, which required puncture by an explosive squib to be opened. Because these bottles were sealed, with no pressure gauges, they were about as leak proof as you could get. It's funny that the addition of a pressure gauge to a fire bottle also adds a potential leak location at the same time  Silly !

Regards, JetMech
JetMech split the back of his pants. He can feel the wind in his hair :shock: .

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