Service difficulty report · Actuator · Boeing 737890

Difficulty date
January 8, 2016
Submitted
January 12, 2016
Operation
Air carrier
Aircraft
N590AS
Make and model
Boeing 737890
Aircraft serial
35687
Aircraft time
30,784 hours, 9,352 cycles
Part
Actuator
Part number
MA30A1001
Part serial
AA131268
Condition
Failed
Location
Lt Spar Valve
Part time
30,784 hours, 9,352 cycles
Stage of operation
TX
How discovered
O
Nature of condition
O
Precautionary procedure
O

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

What was found

DURING ENGINE NR 1 START THE SPAR VALVE CLOSED LIGHT REMAINED BRIGHT WHILE START LEVER WAS IN IDLE DETENT. AFTER STARTER CUTOUT ENGINE VALVE CLOSED LIGHT WENT BRIGHT THEN DIM. THE ENGINE SHUTDOWN AT THAT TIME. SPAR VALVE LIGHT REMAINS BRIGHT WITH THE START LEVER IN CUTOFF. ACFT GROUNDED. GVI OF FUEL SPAR VALVE ENGINE 1 C/B AND CONN D788, NO DEFECTS NOTED. VOLTAGE CKS GOOD. MECHANICALLY OPERATED FUEL SPAR VALVE OPEN AND CLOSED, NO DEFECTS NOTED. SUSPECT BAD NR 1 ENGINE SPAR VALVE ACTUATOR REF FIM 28-22, TASK 809. REMOVED AND REPLACED ENGINE 1 SPAR VALVE ACTR IAW MM 28-22-11-400-804. BONDING CHECK OF SPAR VALVE GOOD. ALSO FOUND CONTACT IN CONNECTOR D40024J BURNED. REPLACED CONNECTOR IAW WDM HOOKUP LIST. RAN NR 1 ENGINE FOR 10 MINUTES AT IDLE, ALL PARAMETERS NORMAL REF AMM 71-00-00-800-808-F00. NR 1 ENGINE "SPAR VALVE CLOSED" ANNUNCIATION WENT BRIGHT THEN OFF MOVING START LEVER TO IDLE, THEN BRIGHT TO DIM MOVING LEVER TO CUTOFF. OPS NORMAL. SUBSYSTEMS COMMON TO D40024J OPS NORMAL.