SDR ASAA2018040624163

Service difficulty report · Igniter · Boeing 737890

Difficulty date: April 6, 2018
Submitted: April 9, 2018
Operation: Air carrier
Aircraft: N590AS
Make and model: Boeing 737890
Aircraft serial: 35687
Aircraft time: 39,212 hours, 11,873 cycles
System (JASC): 4940 · APU Start/Ignition System
Part: Igniter
Part number: 38880587
Part serial: 120997
Condition: Failed
Location: Apu
Part time: 2,195 hours, 4,268 cycles
Stage of operation: NR
How discovered: V
Nature of condition: J
Precautionary procedure: K

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

What was found

APU FAULT LIGHT ILLUMINATED DURING ATTEMPTED START. ACFT GROUNDED, BITE CHECK OF APU REPORTED ONE HISTORY FAULT, 49-41011. NO FLAME SHUT DOWN, AND ONE CURRENT FAULT, 49-31168 FUEL CONTROL UNIT SHOWS OUT OF RANGE HIGH. REMOVED AND REPLACED APU IGNITION UNIT IAW AMM 49-41-31-400-801, OPS CHECKED GOOD, APU STARTS MULTIPLE TIMES.