SDR SIMA200733002

Service difficulty report · Flap System · Saab 340B

Difficulty date: November 23, 2007
Submitted: November 30, 2007
Operation: Air carrier
Aircraft: N304AE
Make and model: Saab 340B
Aircraft serial: 340B304
Aircraft time: 21,154 hours, 22,242 cycles
System (JASC): 2750 · Trailing Edge Flap Control System
Part: Flap System
Condition: Out Of Rig
Location: Te Flaps
Stage of operation: CR
How discovered: O
Nature of condition: F
Precautionary procedure: O

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

What was found

AT FL230, THE A/C BEGAN OSCILLATING PITCH UP/DOWN. THIS OCCURRED AT CRUISE FLT. PITCH UP AND DOWN WENT FROM +2.5 TO -2.5 ABV AND BELOW HORIZON. THIS OCCURRED WITH ALL PAX AND FA SEATED. NO CG CHANGES CONDITION OCCURRED WITH AUTO PILOT ON AND OFF AND YAW DAMPER OFF. LEVEL FLT AT 7K AND 10K ON CLIMB-OUT NO ISSUES. ON DESCENT FL 6K NO ISSUES, ONLY ALT WITH OSCILLATIONS FL230 LEVEL FLIGHT. RERIGGED FLAP ELECTRICAL SYSTEM AIRCRAFT RETURNED TO SERVICE

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