Re: DC-9 hole

Date:         23 Apr 97 02:58:14 
From:         James Buongiovanni <>
Organization: CyberHighway Internet Services
References:   1
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McElravy wrote:
> On the last discussion of "stupid DC-9 tricks" (we were picking on Air
> Canada I believe) someone asked what the hole in the base of the fin was
> for. The question was never answered and I forgot on it until I had
> occasion to fly on a few (NW) over Easter. As I was sitting in the gate
> area I noticed the hole and remembered the discussion.

The hole is where the air goes in for the primary and secondary heat
exchangers. The APU intake is on the bottom of the APU, A switch in the
cockpit must be placed in the "Ram" position to open the door in flight.

 Hope this was of help....