加拿大航空服务难度报告 Canadian Aviation Service Difficulty Reports(7)

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Transport Canada recommends that a detailed visual and functional check be carried out in all extreme travel positions on the engine power linkage controls, following adjustment.
PRATT & WHITNEY CANADA - PT6A-65B (Beech 1900C) SDR # 20040518003
Engine Breather Hose Displaced
Shortly after take-off, the cabin began to fill with fumes and oil vapors. The crew turned off the engine bleed-air and safely returned to the airport.
Maintenance personnel found that the #1 engine breather hose was kinked and pinched. This caused the engine accessory case to pressurize and to force the engine oil to pass the engine labyrinth and the gar lock seals and then enter the engine compressor section.
Some of the oil vapors then entered the cabin through the aircraft bleed-air system creating fumes and visible oil vapor.
The engine breather hose was inspected and repositioned.
propellers
HARTZEL HC-E3YR-2ATF (Piper PA 31 350) SDR # 20040519007
Propeller Cable Broken
Shortly after take-off, a loss of R/H propeller pitch control was noted. The pilot reduced the manifold pressure, completed the propeller overspeed check, secured the right engine and made an uneventful landing.
Maintenance personnel discovered the propeller cable was broken. The cable was completely worn through where it attaches to the support that is connected to the engine starter. This area is just below the propeller governor.
TC recommends that operators and maintainers inspect this hard to access area to verify propeller cable condition.

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WIRE AND LINE CHAFING

The chafing of lines and electrical wires plagues aviation from the smallest private aircraft to the largest commercial operation. Properly routing and securing of vital lines and wires that supply life to aircraft components begins with the manufacturer, and continues with the AME while the aircraft is in service.
As aircraft are modified with new systems, additional lines or wires usually will be required. When developing installation instructions, the STC holder may elect to follow an existing path or take a new one. This complicates things, because the installer requires proper security and the protection of the new and existing systems. We are responsible to ensure proper clearance and security of lines and wires to protect the aircraft structure and its systems. Downtime cost money, secure and protect these critical systems.
SDR # 20030717001
BEECH C90A
Instrument Air Tube Chafed
During a maintenance ground run, following the start of the right engine, a hissing sound was noticed emitting from behind the instrument panel. Further investigation revealed that the instrument air tube,P/N 1013202661, had been chafing on the upper corner of the radio rack. The tube is used to join the vacuum regulator to the left side of the forward bulkhead to the manifold located in the cockpit behind the instrument panel on the right side.
　
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