Selected photos from:

Boeing 737-200
FAA Icing Certification of Hush Kit,
Aft Flap Modifications

This program was for FAA icing certification of a Stage III hush kit installation on a Boeing 737-200, and engineering development of an aft flap modification to reduce drag and improve cruise fuel consumption. Alligator had responsibility for all aspects of test equipment installation and data acquisition for the program, involving 96+ channel pressure scanning, digital, analog, low-speed and video data acquisition.

USAF KC-135 icing tanker shot from cockpit of Boeing 737 test airplane

Instrumented Lear Jet preparing to calibrate the icing plume

Ice build-up on 737 engine inlet (ice is dyed yellow)

Icing on engine pylon and wing leading edge

Icing measurement fence and lines marked on engine inlet prior to test

Flap angle visual measurement jig allows fine adjustment of flap angles in flight

Flap angle jig and airflow-visualization tufts

Aileron and aileron trim tab angle visual measurement jig

Video camera and lens de-fogger for videotaping ice formations during icing tests

Camera pod installed on underside of wing

Strip-A-Tube installation for measuring chord-wise pressure distributions

Port locations drilled into Strip-A-Tube

Boeing's approach to instrumented flight testing

Alligator's approach to instrumented flight testing

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