Service difficulty report · Hmu · Boeing 737990ER

Difficulty date
July 7, 2018
Submitted
July 9, 2018
Operation
Air carrier
Aircraft
N461AS
Make and model
Boeing 737990ER
Aircraft serial
36363
Aircraft time
17,149 hours, 5,656 cycles
Part
Hmu
Part number
442653
Part serial
BECW6455
Condition
Failed
Location
Nr 1 Engine
Part time
30,213 hours, 10,178 cycles
Stage of operation
TX
How discovered
O
Nature of condition
X
Precautionary procedure
K

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

What was found

NR 1 ENGINE EXPERIENCED MULTIPLE AUTO SHUTDOWN DURING STARTING PROCEDURES. GROUNDED - YES. ENGINEERING REQUEST - REMOVED AND REPLACED NR 1 ENG FUEL PUMP REF AMM 73-11-01, AND REMOVED AND REPLACED NR 1 ENG HMU. ACCOMPLISHED ENGINE IDLE LEAK CHECK REF AMM 71-00-00-700-801-F00 NO LEAKS NOTED. ACCOMPLISHED ACTUATOR TEST REF AMM 71-00-00-700-807-F00 OPS TEST GOOD. NO EEC FAULTS FOUND AND OBSERVED NO START FAULTS.