SDR ASAA2016053116881

Service difficulty report · Hmu · Boeing 737890

Difficulty date: May 31, 2016
Submitted: May 31, 2016
Operation: Air carrier
Aircraft: N585AS
Make and model: Boeing 737890
Aircraft serial: 35683
Aircraft time: 33,340 hours, 9,990 cycles
Engine: Cfmint CFM567B27B3
System (JASC): 7320 · Fuel Controlling System
Part: Hmu
Part number: 442597
Part serial: BECW4939
Condition: Failed
Location: Nr 1 Engine
Part time: 31,536 hours, 10,475 cycles
Stage of operation: IN
How discovered: 9
Nature of condition: O
Precautionary procedure: K

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

What was found

WHILE ACCOMPLISHING TASK CARD 78273000, NR 1 ENGINE HAS FAULT 73-31161, MECHANICAL OVERSPEED PROTECTION SIGNAL IS OUT OF RANGE, FAULT IS A LONG TIME FAULT. ACFT GROUNDED. ACCOMPLISHED HMU REMOVAL REF T/C N8473000, ACCOMPLISHED HMU INSTALL AT NR 1 ENGINE, REF N8473001. LEAK/OPS CHECK OK.