# SDR UPS06M47619

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 4, 2006
- Submitted: August 7, 2006
- Operation: Air carrier
- Aircraft: [N250UP](https://openairdocs.org/aircraft/N250UP), registered now
- Make and model: Doug MD-11F
- Registry model: [Doug MD-11F](https://openairdocs.org/model/mcdonnell-douglas-md-11f) (OpenAirDocs)
- Aircraft serial: 48745
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: A/C Pack
- Condition: Failed
- Location: Nr 1
- Stage of operation: CR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UPS06M47619

## Discrepancy

INSPECTION TYPE:N/A ATB - APPROX 45 MINS AFTER DEPARTURE THE CREW REPORTED, LOST OF THE NR 1 AIR CONDITIONING PACK.  BASED ON POTENTIAL EN ROUTE ICING CONDITIONS IT WAS DETERMINED THAT THE FLT WOULD RETURN TO HKG.  T/S PER FIM 36-12-00 FIG 103, FOUND APU LOAD BLEED VALVE NOT FULLY CLOSED. CLOSED VALVE PERFORMED ADJ/TEST OF PNEUMATIC SYS IAW 36-00-03- 5. CK GOOD. APU LOAD BLEED VALVE POS SWITCH WIRING RETURNED TO NORMAL  REF WDM 36-16-01 & EO MD11-4950-24851. VLV OPS CK OK.

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