Service difficulty report · Hmu · Boeing 737990ER

Difficulty date
August 9, 2018
Submitted
August 13, 2018
Operation
Air carrier
Aircraft
N468AS
Make and model
Boeing 737990ER
Aircraft serial
41735
Aircraft time
16,413 hours, 5,468 cycles
Engine
Cfmint CFM567B27E
Part
Hmu
Part number
1853M56P16
Part serial
BECWC003
Condition
Failed
Location
Nr 2 Engine
Part time
16,418 hours, 5,470 cycles
Stage of operation
TX
How discovered
O
Nature of condition
J
Precautionary procedure
D

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

What was found

NR 2 ENGINE, ENG VALVE CLOSED LIGHT REMAINED ILLUMINATED DURING ENGINE START, RESULTING IN NO START. ACFT GROUNDED. THE NR 2 EEC LOGGED 73-31552 FAULT. ATTEMPTED THREE ENGINE STARTS AND FAILED ALL 3. IGNITORS IN BOTH POSITION DISCREETS ON THE INPUT MONITORING CHECKED GOOD IAW FIM 80-06, TASK 801. REMOVED AND REPLACED THE NR 2 HMU IAW TC N8473000, AND TC N8473001, OPS CHECKED GOOD.