# SDR ASAA2021111436612

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 14, 2021
- Submitted: November 16, 2021
- Operation: Air carrier
- Aircraft: [N442AS](https://openairdocs.org/aircraft/N442AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43293
- Aircraft time: 29,910 hours, 9,564 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: IN
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021111436612

## Discrepancy

WHILE ACCOMPLISHING PZTC BITE, FOUND FAULT FOR LH PACK EXIT SRADA. GROUNDED - YES. #1 PZTC REPLACED, REF LOG 60238059, FOR HISTORY OF "DEAD" AND OTHER FAILURE MESSAGES. ACCOMPLISHED MEL 21-5D RESTORATION PROCEDURES PER B737-900 AMM 21-00-00-440-802. RAM DOOR INLET AND EXIT ACTUATORS RETURNED TO NORMAL CONFIG. GROUND VERIFICATION, #1 PZTC INSTL TEST PASS, BITE TEST NO FAULTS AMM 21-61-01-400-801.

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