JmhLUV2fly From United States of America, joined Dec 1999, 559 posts, RR: 0
Reply 1, posted (15 years 3 months 2 weeks 12 hours ago) and read 1216 times:
I believe the hole at the bottom of the tail fin is for the
APU (Auxilliary Power Unit), The last time I saw an
MD-88, just after it pulled up to the gate and the engines were shut down, the APU was started and if you
looked carefully, at this "hole" you could see gas vapor
coming from it as well as the under portion of tail near
the rear stairs, where the APU is located. The system
enables the aircraft to have power while the engines are
not running, I believe.
NKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 3, posted (15 years 3 months 2 weeks 11 hours ago) and read 1205 times:
I assume you meant the hole at the base of the leading edge of the vertical stab. APU exhaust would be on the rear fuselage about 2 O'clock (as viewed from the rear--looking fwd) about halfway down the #2 engine.