Service difficulty report · Pump · Lear 35A

Difficulty date
February 7, 2012
Submitted
February 8, 2012
Operation
Air carrier
Aircraft
N72AX
Make and model
Lear 35A
Aircraft serial
419
Aircraft time
7,432 hours, 6,456 cycles
Engine
Garrtt TFE73122B
Engine time
7,340 hours, 6,282 cycles
Part
Pump
Part number
307085013
Part serial
MX357965
Condition
Faulty
Location
Lt Engine
Part time
7,340 hours, 6,282 cycles
Stage of operation
AP
How discovered
O
Nature of condition
X
Precautionary procedure
O

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

What was found

DURING THE APPROACH THE LT ENGINE FLAMED OUT WHEN THE THROTTLE LEVER WAS RETARDED TOWARDS FLIGHT IDLE. THE PIC DECLARED AN EMERGENCY AND THE AIRCRAFT LANDED WITH NO INCIDENT. THE LT ENGINE WAS NEVER ATTEMPTED TO BE RESTARTED DURING THE APPROACH. ATTEMPTS WERE MADE AT STARTING THE ENGINE WITH NO SUCCESS AND THE FUEL FLOW WAS NOTICED TO BE READING ZERO. MAINTENANCE INSTALLED A PRESSURE GAUGE DIRECTLY TO THE LT ENGINE FUEL PUMP AND DURING A START ATTEMPT FOUND THE PUMP TO BE PRODUCING 0 PSI. THE PUMP WAS REMOVED AND THE IMPELLER WITHIN THE PUMP WAS FOUND TO BE NOT FUNCTIONING. A NEW PUMP WAS ORDERED AND IS BEING INSTALLED AS OF 1500 ON 2/8/12.

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