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This question asks about the S-duct of the L-1011 Tristar. Fooot's answer shows a cut-out of the L-1011. Looking at this cut-out, I'm wondering:

If the engine is at the 'normal' location of the APU, where did the designers of the L-1011 put the APU?

I did a search, and found this site which mentions

The APU is located in a compartment in the aft fuselage.

Another site mentions

Its still in the "tail". Its mounted below the #2 engine. Just forward of the tail skid.

But I don't see you could fit the APU in the small available space..

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enter image description here
(Source via aircraft.wikia.com)

APU is number 134 on the cutaway, which you can find near root of left stabilator leading edge. It is ahead of the engine, below the intake duct, on the left side.

enter image description here
By Reedy (Own work) [CC BY-SA 3.0], via Wikimedia Commons

Its exhaust is on the right side close to the stabilator's leading edge.

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  • $\begingroup$ The picture is a bit blurred, I managed to find a sharper one here: vignette2.wikia.nocookie.net/aircraft/images/5/59/Cutaway.jpg/… $\endgroup$ – ROIMaison Feb 16 '16 at 11:56
  • $\begingroup$ @ROIMaison, I linked to the frame to keep context. There is a "See full size image" link in top left that leads to what you are linking. $\endgroup$ – Jan Hudec Feb 16 '16 at 12:49
  • $\begingroup$ ah right, sorry missed that one. $\endgroup$ – ROIMaison Feb 16 '16 at 12:52
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The APU on the B727 was placed inside the main gear wheel well.

enter image description here

image source

It drew air from inside the wheel well, so it was only for use on the ground. The exhaust was on the top of the right wing close to the fuselage.

enter image description here

image source

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    $\begingroup$ And man is it loud. SOURCE: worked on them for 20 years. $\endgroup$ – Sports Racer Nov 5 '18 at 20:16
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    $\begingroup$ @SportsRacer Yes they were. Used to work at the FedEx hub back when the fleet was mostly 727's. The head cans we wore were not enough working at the belly cargo doors. $\endgroup$ – TomMcW Nov 6 '18 at 18:53
  • $\begingroup$ Does this mean the APU in the 727 couldn't be used to provide emergency power in air? $\endgroup$ – zymhan May 16 at 20:37

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