SDR AALA20170127003

Service difficulty report · Sensor · Boeing 737823

Difficulty date: January 26, 2017
Submitted: January 30, 2017
Operation: Air carrier
Aircraft: N873NN
Make and model: Boeing 737823
Aircraft serial: 40766
Aircraft time: 17,256 hours, 6,912 cycles
System (JASC): 2751 · Trailing Flap Position Indicating System
Part: Sensor
Condition: Malfunctioned
Location: Te Flap
Stage of operation: LD
How discovered: O
Nature of condition: N
Precautionary procedure: O

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

What was found

AIRCRAFT WAS GROUNDED. EMERGENCY DECLARED. DURING LANDING, FLAPS WOULD NOT EXTEND FROM 5 TO 15 DEGREES. USED ALTERNATE PROCEDURE TO LOWER FLAPS TO 15 DEGREES. LANDING UNEVENTFUL. PERFORMED BITE CHECK OF FLAP/SLAT ELECTRONICS UNIT AND FOUND TRAILING EDGE FLAP SENSOR DISAGREE. INSPECTED TRAILING EDGE FLAP DRIVE SYSTEM AND RAN FLAPS SEVERAL CYCLES WITH NO FAULTS. OPERATIONAL CHECK GOOD IAW FIM 27-51-00-810-832.