# SDR ASAA2021120336790

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 3, 2021
- Submitted: December 7, 2021
- Operation: Air carrier
- Aircraft: [N403AS](https://openairdocs.org/aircraft/N403AS), registered now
- Make and model: Boeing 737-900ER
- Registry model: [Boeing 737-900ER](https://openairdocs.org/model/boeing-737-900er) (OpenAirDocs)
- Aircraft serial: 41730
- Aircraft time: 34,048 hours, 10,953 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: CR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021120336790

## Discrepancy

L PACK LIGHT ILLUMINATED ON CLIMB TO CRUISE ALTITUDE RAN QRH TRIP RESET DID NOT EXTINGUISH PACK LIGHT AFFECTED L PACK SWITCH WAS TURNED OFF FOR DURATION OF FLIGHT PER QRH PROCEDURES. GROUNDED - YES. ACCOMPLISHED PZTC BITE PER B737-900 FIM TASK 21-62-801. NO FAULTS FOUND. DURING PZTC BITE OBSERVED LH RAM AIR INLET DEFLECTOR DOOR DOES NOT RETRACT. VERIFIED DOOR DEFLECTOR DOES NOT RETRACT TO "FLIGHT OPEN" POSITION. UPON FURTHER INVESTIGATION OF THE L/H RAM AIR INLET DEFLECTOR FOUND DOOR AND ACTUATOR LINKAGES TO BE DIRTY AND IN NEED OF LUBRICATION. DISASSEMBLED L/H RAM AIR DOOR ACTUATOR LINKAGES, CLEANED AND LUBRICATED THEM AND REASSEMBLED LINKAGE REF B737-900 AMM 21-51-22-400-802. NO LINKAGE ADJUSMENT REQUIRED PER AMM 21-51-22-400-802.

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