Service difficulty report · Unknown · Boeing 737990ER

Difficulty date
September 28, 2015
Submitted
October 2, 2015
Operation
Air carrier
Aircraft
N457AS
Make and model
Boeing 737990ER
Aircraft serial
36355
Aircraft time
6,458 hours, 2,097 cycles
Engine
Cfmint CFM567B27E
Part
Unknown
Part number
UNKNOWN
Condition
Unknown
Location
Unknown
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

DURING ACCOMPLISHMENT OF T/C 78273000, FOUND MSG NR 73-10342 AND 73-30352, FMV POSITION SIGNAL IS OUT RANGE AND THE FMV POSITION SIGNAL DISAGREE RESPECTIVELY ON NR 2 ENGINE. ACFT GROUNDED. MEASURED RESISTANCE BETWEEN HMU RECEPTACLES DP0501 AND DP0601 CHECKS GOOD, AND RESISTANCE AT ELECTRONIC ENGINE CONTROL CONNECTORS DP0505 AND DP0606 CHECKS GOOD, REF FIM 73-25, TASK 803 AND FIM 73-25, TASK 804, RESPECTIVELY. ACCOMPLISHED ACTUATORS TEST REF AMM 71-00-00-700-807-F00 LOGGED 2 FAULTS: 75-30372 HMU VSV CONTROL CURRENTOUT OF RANGE AND 75-20422 HMU VBV CONTROL CURRENT OUT OF RANGE. ACCOMPLISHED "HMU VSV CONTROL CURRENT IS OUT OF RANGE" REF FIM 75-31 TASK 801 ALL RESISTANCE CHECKS ARE GOOD. ACCOMPLISHED "HMU VBV CONTROL CURRENT IS OUT OF RANGE" REF FIM 75-32 TASK 804 ALL RESISTANCE CHECKS ARE GOOD. RE-ACCOMPLISHED ACTUATORS TEST, TEST PASSED NO FAULTS LOGGED. ACCOMPLISHED ELECTRONIC ENGINE CONTROL TEST REF AMM 73-21-00, TEST PASSED.