Service difficulty report · Ignition Sys · Boeing 777222

Difficulty date
December 14, 2012
Submitted
January 14, 2013
Operation
Air carrier
Aircraft
N206UA
Make and model
Boeing 777222
Aircraft serial
30212
Aircraft time
59,848 hours, 8,542 cycles
Engine
Pwa PW4090
Part
Ignition Sys
Condition
Malfunctioned
Location
Nr 2 Engine
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 AUTOSTART, NR 2 ENGINE REACHES 11 PERCENT N1 THEN FUEL FLOW ROLLS BACK WITH NO LIGHT OFF. SAME RESULTS ON CONSECUTIVE RESULTS. AUTOSTART FAULTED ON AHM. NO CORRELATED FAULT MESSAGES AND NO LATCHED EXCEEDANCES. FLIGHT CREW ACCOMPLISHED MANUAL ENGINE START AND ALL OPS AND INDICATIONS GOOD. AUTOSTART SYSTEM DEFERRED PER MEL 8011C. ACCOMPLISHED RESET OF ENGINE IGNITION CIRCUIT BREAKER AND ACCOMPLISHED RT NR 2 ENGINE IAW JRH 2-2-1 WITH AUTO START FUNCTION WAS NORMAL, ACCOMPLISHED START 2X. NO FAULTS, ALL ENGINE PARAMETERS WERE NORMAL. NO START IN AUTO. ACCOMPLISHED SIX GOOD STARTS, ACP 71-08 TASK828 OF 2.9 BLEED TEST GOOD. ACCOMPLISHED DRY MOTOR TEST 15 MM71- 00-00. OPS CHECKED NORMAL.