# SDR UIEA2020020400184

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 1, 2020
- Submitted: February 4, 2020
- Operation: Air carrier
- Aircraft: [N1709A](https://openairdocs.org/aircraft/N1709A), registered now
- 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](https://openairdocs.org/jasc/4900)
- Part: Unknown
- Condition: Unknown
- Location: Unknown
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2020020400184

## Discrepancy

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>)

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