• NC Software is having a Black Friday Sale Event thru December 4th on Logbook Pro, APDL - Airline Pilot Logbook, Cirrus Elite Binders, and more. Use coupon code BF2020 at checkout to redeem 15% off your purchase. Click here to shop now.
  • NC Software is proud to announce the release of APDL - Airline Pilot Logbook version 10.0. Click here to view APDL on the Apple App store and install now.

Simple question: What is that thing?

pilot773

Member
Joined
May 14, 2002
Posts
23
Total Time
200
I've noticed on the very end of the tail of several aircraft there seems to be an outlet of some kind. What is that outlet called? What is its function? How come a 777 doesnt have one?
 

avbug

Well-known member
Joined
Dec 14, 2001
Posts
7,602
Total Time
n/a
That really depends on what aircraft you're referring to. Typically fuel vents and other vents are located here. Fuel dump outlets may also be located here. APU outlets, and even trailing antennaes are often located at the aft end of the fuselage or tailcone. In some cases in light jets and military equipment, a drogue or drag chute may be located here.
 

pilot773

Member
Joined
May 14, 2002
Posts
23
Total Time
200
ok, lets say on teh back end of a 767. I believe that I've seen those outlets on there before.
 

flyingtoilet

Well-known member
Joined
Feb 5, 2002
Posts
61
Total Time
4000
I agree, your probably thinking of the APU. But simply stopping at saying it's an APU probably doesn't help much. Here's a quick explanation.

APU stands for Auxillary Power Unit. It is usually a single-stage turbine engine used to supply the aircraft with electrical and pneumatic power while on the ground, typically when at the gate when engines are not running or on taxi.
 

eriknorth

Well-known member
Joined
Jan 28, 2002
Posts
148
Total Time
almost
I don't know about that, guys...speaking from my wealth of knowledge and experience, I'm going to have to agree with the poopie.
 

corky

Well-known member
Joined
Nov 29, 2001
Posts
151
Total Time
4000
737,47,67,57 --its the APU Exhuast. 777 has the exhaust back there too but faired into the duck fin tailcone(design courtesy of Douglas) The MD twin jets exhaust the APU over top the right pylon.

Sometimes they go poopie there too. usually after ingesting FOD
 

cl-65link

Well-known member
Joined
Nov 26, 2001
Posts
271
Total Time
8000
On the Saab there is a vent just below the tail nav lights and it is there for the outflow valve for the pressurization. The CRJ's apu exhaust is on the fuselage just below and aft of the #2(right) engine.
 

skydiverdriver

Senior Member
Joined
Nov 26, 2001
Posts
869
Total Time
5000+
On the Brazillia, it's the APU exhaust. On the FK-27, it's actually just a hole. It's there in case the rear pressure bulkhead explodes, to make sure it doesn't take the entire tail with it. So, it's a hole vented to the atmosphere from the unpressurized portion of the tail. Hope this helps.
 

Tim47SIP

Serving for the USofA
Joined
Dec 5, 2001
Posts
1,157
Total Time
10,000
On the ATR 42/72, it is a hole! That would be a bad thing. Wish it had an APU!!!! No more GPU's!!!!:D
 
Top