SDR 99ZZZX1170

Service difficulty report · Impeller · Lear 35A

Difficulty date: February 15, 1999
Submitted: March 26, 2000
Operation: General aviation
Filed by: IY2R915K
Lufthansa Technik Engine Services, Inc
Aircraft: N97AN
Make and model: Lear 35A
Aircraft serial: 373
Engine: Garrtt TFE73122B
System (JASC): 7230 · Turbine Engine Compressor Section
Part: Impeller
Part number: 30733941
Condition: Cracked
Location: Compressor
Part time: 4,056 hours
Component: 723010
Stage of operation: IN
Nature of condition: O
Precautionary procedure: K

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

What was found

DURING ROUTINE CZI (COMPRESSOR ZONE INSPECTION), HIGH PRESSURE COMPRESSOR IMPELLER WAS SENT TO ALLIED SIGNAL FOR EDDY CURRENT INSPECTION OF SEAL RELIEF/BORE AREA PER ALERT SB A72-3641. SUBSURFACE DISCONTINUITY WAS REVEALED BY THE INSPECTION. PART IS SCRAP. SERVICE LIFE OF THIS PART IS 10,000 CYCLES. AT THE TIME OF INSPECTION, 3,133 CYCLES HAD ACCRUED. RE: WO NR GR2327.

More about the Lear 35A