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Intake At The Vertical Stabilizer Of CRJ700s  
User currently offlineLZ129 From Germany, joined Feb 2013, 104 posts, RR: 0
Posted (2 years 11 months 3 weeks 6 days ago) and read 4277 times:

I tried to find out if this question was asked before and I did find something in the archives, but since the picture linked in that thread was no longer available, I couldn't really tell if the question back then was actually the same as the one I have.

In this picture: http://www.airliners.net/photo/Styri...d=35645fa92b3d52f220f6e3be432eabd9 It is clearly visible that all of Bombardier's CRJs seem to have some sort of an air intake where the front of the vertical stabilizer and the fuselage meet. My simple question is: What is the purpose of that intake and do other types of aircraft have it as well?

5 replies: All unread, jump to last
User currently offlinebeiaard From United States of America, joined May 2011, 56 posts, RR: 0
Reply 1, posted (2 years 11 months 3 weeks 5 days 14 hours ago) and read 4257 times:

Seemed to me that it must be the APU intake, but after reading this thread:
APU Inlet (by A346Dude Mar 24 2008 in Tech Ops)
I saw that in reply 4, Planenutok explains that, "On the CRJ 700 that i work on the apu has a door on the right side below the vertical stab as shown in this photo. The inlet at the base of the vertical stab is the pack inlet."

User currently offlineLZ129 From Germany, joined Feb 2013, 104 posts, RR: 0
Reply 2, posted (2 years 11 months 3 weeks 5 days 13 hours ago) and read 4240 times:

Thank you very much! So it was already answered afterall.

User currently offlineAlias1024 From United States of America, joined Oct 2004, 2995 posts, RR: 2
Reply 3, posted (2 years 11 months 3 weeks 5 days 13 hours ago) and read 4240 times:

It's the Ram Air Intake. Air is drawn in through the intake and passes across the precooler and dual air-to-air heat exchangers of each pack before being discharged through exhaust vents. There's also a shutoff valve that when opened allows the ram air to be used for instrument display cooling along with ventilation of the flight deck and cabin. This would only be used in abnormal operations. Ram air is also used for hydraulic system cooling for two of the three hydraulic systems.

[Edited 2013-06-05 14:08:28]

It is a mistake to think you can solve any major problems with just potatoes.
User currently offlineferpe From France, joined Nov 2010, 2809 posts, RR: 60
Reply 4, posted (2 years 11 months 3 weeks 5 days 6 hours ago) and read 4088 times:

There is a nice decsription of the ECS system on smartcockpit:


Non French in France
User currently offlineLH707330 From United States of America, joined Jun 2012, 1472 posts, RR: 3
Reply 5, posted (2 years 11 months 3 weeks 5 days 6 hours ago) and read 4078 times:

I believe the DC-9 has a similar layout too with the gap, and the Tu-154 and 727 have a bigger APU there  

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