Cessna 172S Skyhawk SP

Restricted Engine Fuel Hose

Engine began running rough in cruise, the pilot diverted and the aircraft was landed without damage. Investigation found the fuel line between the fuel flow transducer and fuel flow divider was loose at the flow divider. “Although it seems unlikely, the aircraft operator has to consider the possibility that this fuel line came loose by itself in the five days and 23 hours of flying since the last scheduled inspection….”

Part total time: 816.0 hours

Cessna T210L Turbocharged Centurion

Leaking Fuel And Oil Hoses

Ground run revealed wastegate oil hose leaking at the engine. Replaced fitting, but leak continued and the hose was replaced with a slightly longer hose. Second test flight above airport found even larger leak than first flight. Component removal revealed main fuel line from fuel strainer to engine-driven fuel pump was wet with fuel and fire sleeve swelling and falling off of fuel hose. All hoses removed and replaced.

Part total time: Unknown

Cirrus SR22T

Burned Engine Oil Hose

Oil line to the left turbo wastegate controller was contacting the wastegate down pipe, burning a hole in the oil hose. The engine lost 10 quarts of oil before the pilot could land at the nearest airport. The hose needs to be longer to allow rerouting it away from the turbo and exhaust components.

Part total time: 561.0 hours


Mooney M20S Eagle

Deteriorated Vacuum Hose

Standby vacuum system found inoperative. Electric-driven pump found full of a thick oily substance. Hose from pump to firewall was full of this fluid, but there was none in the vacuum regulator. It appears the fluid is from deterioration of the hose. “This is an emergency backup system that will fail when it is needed.”

Part total time: Unknown

Piper PA-28-140

Failed Oil Cooler Hose

After landing, the pilot discovered a pool of oil under the engine. Investigation revealed an oil cooler hose had split and dumped approximately six quarts of oil. Both hoses had been replaced 7.58 flight hours earlier to comply with AD 95-26-13. Close inspection found hose material split open in three places.

Part total time: 7.58 hours

Piper PA-31-350 Navajo Chieftain

Burst Hydraulic Hose

Main landing gear hose burst on ground during a runup. Removed all hoses, inspected ends IAW the maintenance manual, found five more defective hoses, repaired and pressure tested to 3000 psi, reinstalled on aircraft.

Part total time: Unknown

The following information is derived from the FAA’s Service Difficulty Reports and Aviation Maintenance Alerts.


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