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737 A.p.u. Exhaust Holes  
User currently offlineGulfstreamGuy From United States of America, joined Jul 1999, 646 posts, RR: 1
Posted (15 years 2 months 1 week 3 days ago) and read 982 times:

I noticed when 737s (mainly just Southwest here in LIT) come in, on all the -200s, -300s, and -500s, the auxillary power unit in the tail cone section have only one exhaust "hole". However, on the -700s they have TWO openings. Anybody know the reason for this?


"If we couldn't laugh, we would all go insane. " -Jimmy Buffett
2 replies: All unread, jump to last
 
User currently offlineJim From United States of America, joined Jul 1999, 455 posts, RR: 1
Reply 1, posted (15 years 2 months 1 week 2 days 14 hours ago) and read 931 times:

It was explained to me that the second hole is used to ventilate and cool the APU compartment. Basically, the aft end of the tube is close enough to the exhaust to cause a venturi-effect, drawing air into the compartment. The forward end of the tube is next to the APU oil cooler, so air from the compartment is drawn across the oil cooler and exits overboard at the exhaust. I was told that the -700s & -800s have this.
-jim


User currently offlineGulfstreamGuy From United States of America, joined Jul 1999, 646 posts, RR: 1
Reply 2, posted (15 years 2 months 1 week 2 days 8 hours ago) and read 920 times:

Thanks Jim!


"If we couldn't laugh, we would all go insane. " -Jimmy Buffett
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