Service difficulty report · Eec · Boeing 737890

Difficulty date
December 29, 2015
Submitted
January 4, 2016
Operation
Air carrier
Aircraft
N566AS
Make and model
Boeing 737890
Aircraft serial
35182
Aircraft time
34,585 hours, 10,429 cycles
Part
Eec
Part number
9387M17P09
Part serial
HTL17393
Condition
Failed
Location
Nr 2 Alternator
Part time
35,045 hours, 11,757 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 T/C 78273000 FOUND THE FOLLOWING SHORT TERM FAULT ON NR 2 ENGINE 73-21272 ALT VOLTAGE INPUT TO THE ELECTRONIC ENGINE CONTROL IS OUT OF RANGE. MUST BE CORRECTED WITHIN 50 FLT HOURS. ACFT GROUNDED. FOUND FAULT STILL ACTIVE IN ELECTRONIC ENGINE CONTROL RECENT FAULTS. MEASURED NR 2 ENGINE ELECTRONIC ENGINE CONTROL ALTERNATOR, FOUND PINS 5 TO 3 AND PINS 6 TO 3 TO READ LOW AT .080 MILLIOHMS. SHOULD BE AT 120 TO 145 MILLIOHMS IAW FIM TASK 73-27, TASK 804 FOR PRE SB CHART. R & R NR 2 ENGINE ELECTRONIC ENGINE CONTROL ALTERNATOR AND ALTERNATOR ROTOR IAW MM 73-21-08-40-801. OPS CHECKS GOOD. VERIFIED REPAIR CONFIRMATION IAW FIM TASK 73-27, TASK 804. MAINTENANCE MESSAGE NO LONGER SHOWS IN FLIGHT LEG 0.