Service difficulty report · Hmu · Boeing 737990ER

Difficulty date
March 17, 2015
Submitted
March 19, 2015
Operation
Air carrier
Aircraft
N471AS
Make and model
Boeing 737990ER
Aircraft serial
41703
Aircraft time
1,640 hours, 556 cycles
Engine
Cfmint CFM567B27E
Part
Hmu
Part number
1853M56P16
Part serial
BECWC264
Condition
Malfunctioned
Location
Nr 1 Engine
Part time
1,647 hours, 560 cycles
Stage of operation
TX
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

NR 1 ENGINE CONTROL LIGHT CAME ON AFTER TOUCHDOWN. ACFT GROUNDED. ACCOMPLISHED FIM TASK 75-23-TASK 801 AND FIM 75-22- TASK 801, RESET FAULT CLEAR DURING ENGINE RUN NO ACTIVE FAULTS DURING ACTIVATES TEST IAW AMM 71-00-00-700-807-FOO. TECH SERVICES REQUESTS FOLLOW UP. REMOVED HMU IAW T/C N8473000, INSTALLED HMU T/C N8473001 UP TO STEP 1B, 11. FOUND 1 ENG HMU FUEL TUBE FROM SERVO-FUEL HEATER LEAKING FROM FUEL PUMP CONNECTION. R & R NR 1 ENG HMU FUEL TUBE FROM SERVO-FUEL HEATER TO FUEL PUMP REF T/C N8473001, LK CK GOOD.