Turbotrent
Topic Author
Posts: 146
Joined: Tue Jan 01, 2002 8:43 pm

B737 Question Regarding APU Hole

Fri Jun 13, 2003 9:21 pm

Hello everyone,

Yesterday I was looking at the new pictures in de database and I came across this one :


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Photo © Lee Archer



I have never realised that there were 2 'holes' at the very end of a B737. I assume that the biggest hole is the outlet for the APU, but what is the first, smaller hole for?
BTW, Very nice picture Lee!

Best regards,

Tom
Man's flight through life is sustained by the power of his knowledge.
 
avioniker
Posts: 1099
Joined: Tue Jan 01, 2002 5:38 am

RE: B737 Question Regarding APU Hole

Fri Jun 13, 2003 10:13 pm

In the NG 737's the APU cooling air is provided by an eductor system. The air is drawn in by venturi (for lack of a better term) action and flows across the oil cooler and through the compartment before being extracted through a jacket surrounding the exhaust duct. The upper hole is the air inlet. (I might add that it is exactly the size prefered by the pigmy barn owl for its nest.)
Here's a link
http://www.b737.org.uk/apu.htm
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
 
FredT
Posts: 2166
Joined: Thu Feb 07, 2002 9:51 pm

RE: B737 Question Regarding APU Hole

Fri Jun 13, 2003 10:25 pm

"(I might add that it is exactly the size prefered by the pigmy barn owl for its nest.)"

Now that is exactly the kind of critical information that is always omitted from maintenance manuals! Experience at it's best.  Smile

Cheers,
Fred, tech pubs guy
I thought I was doing good trying to avoid those airport hotels... and look at me now.
 
Turbotrent
Topic Author
Posts: 146
Joined: Tue Jan 01, 2002 8:43 pm

RE: B737 Question Regarding APU Hole

Sat Jun 14, 2003 6:05 pm

Thanks for your replies guys!

Avioniker, very interesting website you gave me!

Best regards,

Tom
Man's flight through life is sustained by the power of his knowledge.
 
737doctor
Posts: 1291
Joined: Mon Mar 19, 2001 4:52 pm

RE: B737 Question Regarding APU Hole

Tue Jun 17, 2003 2:34 am

Turbotrent,

I recently had this photo accepted which gives an excellent view of the NG 737 APU exhaust of which you speak. Since it is pertinent to the discussion, I thought you might enjoy it.


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Photo © 737doctor

Patrick Bateman is my hero.

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