# SDR ASAA2020082543078

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 24, 2020
- Submitted: August 26, 2020
- Operation: Air carrier
- Aircraft: [N486AS](https://openairdocs.org/aircraft/N486AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44107
- Aircraft time: 19,249 hours, 6,153 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Warning Message
- Condition: False Activation
- Location: Rt A/C Pack
- Stage of operation: CL
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020082543078

## Discrepancy

ON CLIMBOUT RIGHT PACK ILLUMINATED.  RAN QRH AFTER COOLING DOWN PACK RESET.  GROUNDED - YES.  PERFORMED PZTC BITE, REF B737-900 FIM 21-62 TASK 801, NO FAULTS ON EITHER PZTC.  REMOVED UNION FROM ACM TO INSPECT BLADES WITH BORESCOPE, NO DAMAGE FOUND.  REINSTALLED UNION, IAW B737-900 AMM 21-51-04.  PER FIM 21-52 TASK 821 AND DUE TO A/C RT PACK HISTORY, RECOMMEND HEAT EXCHANGER CLEANING, REF AMM 21-51-03-160-807. CLEANED RIGHT PACK HEAT EXCHANGER, REF AMM 21-51-03-160-807.  RAN PACK FOR 20 MINUTES, OPS NORMAL.  COMPLETED FIM TASK 21-52 TASK 821.

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