# SDR ASAA2017091221921

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 12, 2017
- Submitted: September 14, 2017
- Operation: Air carrier
- Aircraft: [N453AS](https://openairdocs.org/aircraft/N453AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36354
- Aircraft time: 14,572 hours, 4,795 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Actuator
- Part number: 676000141
- Part serial: 67600014641
- Condition: Failed
- Location: Lt A/C Pack
- Part time: 10,073 hours, 3,381 cycles
- Stage of operation: CR
- 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/ASAA2017091221921

## Discrepancy

LEFT PACK LIGHT ILLUMINATED DURING CRUISE. PACK RESET, LIGHT EXTINGUISHED. LIGHT RE- ILLUMINATED, ISOLATION VALVE CLOSED, LEFT PACK SWITCH OFF (QRH). GROUNDED - YES. REMOVED AND REPLACED L/H EXIT SRADA PER B737-900 AMM 21-51-27. OPS CHECKS GOOD. PERFORMED BITE CHECK ON BOTH PACK TEMP CONTROLLERS. NO MORE FAULT LIGHT FOR SRADA EXIT ACTUATOR. OPERATED APU AND PACKS. NO PACK LIGHT. SYSTEM OPERATES NORMAL .

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