SDR ASAA2018010823115

Service difficulty report · Fault Code · Boeing 737890

Difficulty date: January 8, 2018
Submitted: January 17, 2018
Operation: Air carrier
Aircraft: N588AS
Make and model: Boeing 737890
Aircraft serial: 35685
Aircraft time: 38,650 hours, 11,726 cycles
Engine: Cfmint CFM567B27
System (JASC): 7320 · Fuel Controlling System
Part: Fault Code
Condition: False Activation
Location: Nr 2 Hmu
Stage of operation: IN
How discovered: 9
Nature of condition: N
Precautionary procedure: K

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

What was found

FOUND THE NR 2 ENGINE, SHORT TIME FAULT MESSAGE 75-10372, THE HMU CONTROL CURRENT IS OUT OF RANGE. ACFT GROUNDED. ACCOMPLISHED EEC TEST, NO FAULTS LOGGED ON FLT LEGS 1 AND 2. ACCOMPLISHED FIM 75-31 - 801, HMU VSV CONTROL OUT OF RANGE FAULT ISOLATION, RESISTANCE WITHIN LIMITS, 17.8 OHMS. ACCOMPLISHED TEST 12, ACTUATOR TEST, OPS NORMAL IAW AMM 71-00-00-700-807-F00. ACCOMPLISHED EEC BITE TEST, OPS NORMAL IAW AMM 73-21-00-740-803-F00.