# SDR ASAA2019123091715

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 29, 2019
- Submitted: December 31, 2019
- Operation: Air carrier
- Aircraft: [N433AS](https://openairdocs.org/aircraft/N433AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41704
- Aircraft time: 24,498 hours, 7,900 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Warning Light
- Condition: False Activation
- Location: Lt A/C Pack
- Stage of operation: NR
- 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/ASAA2019123091715

## Discrepancy

LEFT PACK LIGHT ILLUMINATES DURING MASTER RECALL. LIGHT EXTINGUISHES WHEN MASTER RESET. GROUNDED - YES. #1 PZTC FAULTS SRADA "RAM AIR SNSR" AND "INLET". FOUND SRADA STOWAGE LINK STILL INSTALLED IN RAM AIR EXHAUST MODULATING SYSTEM. REVERSED CONFIGURATION CHANGES FROM PREVIOUS MEL 21-5D, EVERYTHING BACK IN NORMAL CONFIGURATION. BITE CHECK OF #1 PZTC NML, REF MM 21-61-00. ETOPS GRD VERIFICATION VERIFIED.

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