SDR CA970521005

Service difficulty report · Switch · Beech 1900D

Difficulty date: April 28, 1997
Submitted: March 26, 2000
Operation: Air carrier
Make and model: Beech 1900D
Engine: Pwa PT6A67D
Propeller: Hartzl HCE4A3I
System (JASC): 2750 · Trailing Edge Flap Control System
Part: Switch
Part number: BZ7RW82255518T
Condition: Failed
Location: Te Flap
Stage of operation: AP
Nature of condition: O
Precautionary procedure: O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

(CAN) ON FINAL, FLAP SELECTED TO 17 DEGREES, FLAPS DID NOT MOVE. MAINTENANCE INVESTIGATION REVEALED THAT THE TERMINALS WERE CORRODED ON THE FLAP MICROSWITCHES S254/S255 CAUSING FLAP INOPERATIVE CONDITION. THE TERMINALS ARE NOT PROTECTED FROM THE ENVIRONMENT.

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