737 NACA inlet with moving parts?

From:         fintubi@navier.stanford.edu (Bill Urban)
Organization: Stanford University
Date:         08 Aug 96 12:11:52 
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On certain 737s, I've noticed that a NACA duct near the rear of the
fuselage (right side, I believe) seems to have a mechanized piece which
folds out away from the a/c, rather than the usual 'passive' design
familiar from other planes (and race cars).  Is this the inlet for the
APU?  How, when, and why does it operate?

Just curious,

Bill
longtime lurker, 1st-time poster

--
Bill Urban     fintubi@navier.stanford.edu    (415) 723-0560
High Temperature Gasdynamics Laboratory, Stanford University