What was found
APUC DETECTED LOSS OF ABILITY TO PNEUMATICALLY LOAD APU. MESSAGE IS TRIGGERED BY IGV OR SURGE CONTROL SYS FAULTS. REPLACED DIFFERENTIAL PRESSURE SWITCH. OP CHECKED GOOD. STATUS MESSAGE CLEARED.
- Difficulty date
- May 25, 2013
- Submitted
- July 26, 2013
- Operation
- Air carrier
- Aircraft
- N776UA
- Make and model
- Boeing 777222
- Aircraft serial
- 26937
- Aircraft time
- 70,592 hours, 12,434 cycles
- Engine
- Pwa PW4077
- System (JASC)
- 4950 · APU Bleed Air System
- Part
- Pressure Switch
- Part number
- 38762191
- Part serial
- 65242195
- Condition
- Failed
- Location
- Apu Bleed
- Stage of operation
- NR
- How discovered
- 9
- Nature of condition
- J
- Precautionary procedure
- O
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.