Service difficulty report · Fmu · Boeing 777222

Difficulty date
July 21, 2001
Submitted
October 23, 2001
Operation
Air carrier
Aircraft
N771UA
Make and model
Boeing 777222
Aircraft serial
26932
Aircraft time
24,161 hours, 4,922 cycles
Engine
Pwa PW4077
Engine time
20,640 hours, 4,712 cycles
Part
Fmu
Part number
8088001
Part serial
F32614
Condition
Defective
Location
Lt Engine
Part time
20,638 hours
Stage of operation
CR
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

L ENG EPR FLUX APPROX. .02 AT CRUISE. ALL OTHER ENG PARAMETERS FOLLOW FLUCTUATION. AUTOTHROTTLE DISCONNECT NO HELP. SUPPLEMENTAL DATA UPDATE REPLACED FUEL METERING UNIT P/N 808800-1 S/N F32614 AT PART TOTAL TIME 20638. EPR FLUX HAS NOT REOCCURRED TO DATE ON ENGINE W/ NEW FMU. UNIT WAS TESTED, DISCOVERED BAD MPSOV PROXIMITY SENSOR. DURING OVERHAUL DISCOVERED WEAR ON MPSOV, LVDT HOUSING AND PISTON. PARTS REPLACED AND UNIT RELEASED FOR SERVICE (MR73205-33). P/N:806829-1, 808678-1,811399-11,811399-21,