SDR UIEA2019082705300

Service difficulty report · Indication Sys · Boeing 767375

Difficulty date: August 26, 2019
Submitted: August 27, 2019
Operation: Air carrier
Aircraft: N1709A
Make and model: Boeing 767375
Aircraft serial: 24086
Aircraft time: 92,855 hours, 21,632 cycles
System (JASC): 4950 · APU Bleed Air System
Part: Indication Sys
Condition: False Indication
Location: Apu
Stage of operation: TX
How discovered: O
Nature of condition: N
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 START, APU DUCT PRESSURE FALLS FROM 25 PSI TO LESS 15 PSI. N2 GETS TO NO MORE THAN 18% N2. NO START LIMITATIONS EXCEEDED. NOTED BY MX. PERFORMED APU BITE IAW AMM 49-11-00/958, OPS NORMAL, NO FAULTS NOTED. PERFORMED ENGINE RUN IAW AMM 71-00-00, APU MES, OPS NORMAL.