加拿大航空服务难度报告 Canadian Aviation Service Difficulty Reports(2)

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BEECH B200 SDR # 20040423006
Safety Switch Defective
After conducting a walk-around, the pilot reported that the angle of attack vane was hot and appeared to be on "high" mode. In researching the wiring diagram and troubleshooting system operation, maintenance discovered the left main gear safety switch, P/N 1013646283, had high resistance through the switch contacts when the aircraft was on the ground.
Consequently, the defective switch was delivering false information to the stall heat panel allowing maximum voltage for maximum heat. Due to this false information, the aircraft assumed that is was in "flight mode". The failed switch was replaced and normal operation of the system resumed.
Times Since New (TSN): 6471.8 hrs
BOEING 727 SDR # 20040519011
Keel Beam Web Area Cracked
While troubleshooting an APU snag, maintenance personnel discovered a crack in the keel beam web load control valve area, STA 870. The damage is being repaired in accordance with SRM 53-10-9. Crack length approximately
3.5 inches in length.

BOEING 737 SDR # 20040519014
Spoiler Actuator Cracked
While taxiing to the gate, the aircraft experienced a loss of nose wheel steering accompanied with the total loss of hydraulic system "A" pressure and quantity.
Maintenance found the #8 ground spoiler actuator to be the cause. The actuator body had structurally failed causing the fluid loss. The actuator was replaced and aircraft returned to service.
The actuator was routed to the maintenance provider's shop with request for full report.
The SDR database contains other examples of this type of failure. Maintainers are encouraged to pay close attention to this area in an attempt to detect the leak and possibly prevent component in service failure.

BOMBARDIER CL215 1A10 -Water Bomber SDR # 20040510003
Control Cable Corroded
During a structural repair to the right rear wing-to-fuselage frame angle, a panel at WS 60.80 adjacent to the rear spar, had to be drilled off to facilitate the repair.
Corrosion was discovered on the rudder/aileron interconnect cable, P/N 215-90381-2, which lies directly under this panel. The corrosion was removed and upon a closer inspection, several broken strands were noticed.
The maintenance manual was consulted and it was determined that the cable was damaged beyond limits. The cable was removed and replaced with a serviceable one. It is worth noting that the damage would be impossible to spot had it not been for the removal of the riveted panel. This is an area that is normally inaccessible.
When maintenance is being performed in areas where access could not normally be gained, AME's are reminded to be diligent and check for additional defects.
BOMBARDIER CL600 1A11 SDR # 20040322006
APU - Plenum Assembly Fractured
When the APU (auxiliary power unit) was started, it would not accelerate past 40%. Investigation found a large split (crack) on the outer casing of the plenum assembly, P/N 3846068-5.
　
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