2003-09-04: UPDATE Maintenance and Manufacturing reported that on approach to landing, a flap asymmetry was noted (flaps 10 and 15 degrees). Upon further selection, the flaps would not proceed past flaps 15. Company maintenance corrective action; FSEU (Flap/Slat Electronics Unit) Bite Test carried out per FIM (Fault Isolation Manual) 27-51, Task 840 (Flap Position Indicator - Needle Split Problem). No existing faults. Maintenance message code 27-52259 - L/H flap sensor indicated. Task carried out IAW FIM 27-51-813 (Left Flap Position Transmitter Disagree Problem). Maintenance conducted operational check of flaps system - checked serviceable. The aircraft returned to service with no further incidents to report.
2003-09-02: The Westjet Boeing 737-700, C-FKWS, was on approach to Regina, SK, when a go-around was initiated because of a flap asymmetry indication. The aircraft was levelled at 4000 ft asl and the flap asymmetry checks were completed. There were no abnormal control forces and normal flap indications were displayed. A second approach was attempted. On final approach, flaps 25 and flaps 30 were selected without corresponding flap movement and a second go-around was executed. ATC was advised that the aircraft would land with reduced flaps, but that CFR was not required. The crew ran the trailing edge non-normal checklist and a flaps 15 landing was completed. Maintenance carried out a bite test and were unable to duplicate the fault. The flaps functioned normally during the ground test.


CADORS Number 2003C1235
Occurrence Type Incident
Reported By Transportation Safety Board of Canada
Occurred At 2003-08-20 - 00:00
Day or Night? Day-time
Fatalities 0
Aerodrome ID CYQR
Aerodrome Name REGINA INTL SK (CYQR)
Geographic Location Saskatchewan, Canada, North America, Prairie and Northern Region, Regina
TSB Occurrence Number A03C0230
TSB Class of Investigation Class 5
AOR Number
Reported By Transportation Safety Board of Canada
Categories Undershoot/overshoot,System/component failure or malfunction [non-powerplant]

Aircraft Details (1 aircraft)

Type Aeroplane
 Silhouette image of Aeroplane
Canadian Registration FKWS | Flightaware (Registration) | Flightaware (Tracking) | AvHerald
Foreign Registration
Country of Registration Canada
Occurrence Type Incident
Operator WESTJET (8893) Commercial
Make  Silhouette image of BOEING
Model 737 76N
Year Built 2001
Engine Type Turbo fan
Engine Model  Silhouette image of CFM56-7B22
Gear Type Land
Private No
Amateur Built No
Flight Number WJA
Flight Rule
CARS Subpart
Phase of Flight Approach
Damage No Damage
Fatalities 0
Injuries 0
Events Overshoot/missed approach,Flight control systems (ailerons, rudder, rotors, flaps, main, tail)

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