# SDR ASAA2017042720552

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 27, 2017
- Submitted: May 1, 2017
- Operation: Air carrier
- Aircraft: [N478AS](https://openairdocs.org/aircraft/N478AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44105
- Aircraft time: 7,218 hours, 2,412 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Warning Light
- Condition: Illuminated
- Stage of operation: DE
- 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/ASAA2017042720552

## Discrepancy

DURING DESCENT,  WITH LEFT PACK ON MEL,  LEFT PACK LIGHT ILLUMINATED. TRIP RESET HAD NO EFFECT. SELECTED PACK OFF AND LEFT BLEED OFF. LIGHT WENT OUT APPROX 7-10 MINUTES LATER. EQUIPMENT COOLING EXHAUST ALSO ILLUMINATED AND DID NOT GO OUT AFTER SELECTING ALTERNATE.  ACFT GROUNDED.  ACCOMPLISHED EQUIPMENT COOLING EXHAUST FAN OPERATIONAL TEST. TEST PASSED IAW AMM 21-27-00-700-802.

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