SDR ASMF200604006

Service difficulty report · Engine · Boeing 737*

Difficulty date: April 15, 2006
Submitted: April 17, 2006
Operation: Air carrier
Aircraft: N853AM
Make and model: Boeing 737*
Aircraft serial: 33791
Aircraft time: 4,888 hours, 2,696 cycles
Engine: Ge CFM562
Engine time: 4,897 hours, 2,702 cycles
System (JASC): 7200 · Engine (Turbine/Turboprop)
Part: Engine
Condition: Damaged
Location: Left
Part time: 4,897 hours, 2,702 cycles
Stage of operation: IN
How discovered: B
Nature of condition: C
Precautionary procedure: K

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

What was found

DURING BOROSCOPIC INSPECTION OF THE LEFT ENGINE, IT WAS DETECTED AN OVERLAP SHINGLED TIP SHROUDS BETWEEN TWO BLADES, STAGE 3 LPT. ENGINE WAS REPLACED IAW MM 71-00-02 BUT DURING ENGINES TEST THE MESSAGES 75-30381, 75-30531, 75-10431 AND 75-10581 WERE SHOWN. FIM PROCEDURE WAS PERFORMED AND MESSAGES WERE ERASED WITH HPSOV VOLTAGE CORRECT; AS A PRECAUTIONARY ACTION, THE HMU WAS REPLACED IAW MM 73-21-10, TESTED CORRECT.