SDR UIEA2020020400184

Service difficulty report · Unknown · Boeing 767375

Difficulty date: February 1, 2020
Submitted: February 4, 2020
Operation: Air carrier
Aircraft: N1709A
Make and model: Boeing 767375
Aircraft serial: 24086
Aircraft time: 93,675 hours, 21,924 cycles
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: Unknown
Condition: Unknown
Location: Unknown
Stage of operation: TX
How discovered: O
Nature of condition: J
Precautionary procedure: O

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

What was found

REPEAT WRITE UP (1ST WRITE UP ON LP #1182887), ON BOTH ENGINE STARTS DUCT PRESSURE DROPPED TO AROUND 20 PSI AND N2 MAX MOTORED TO 12%-19% N2 BEFORE RUN SWITCHES ENGAGED (BOTH PACKS OFF).(<P>PERFORMED BITE TEST OF APU CONT. UNIT, NO FAULTS. APU DUCT PRESS NORMAL, ALL MODES. REF AMM FIM 49-11 FT 982.</P>)