# SDR ASAA2019041078936

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 7, 2019
- Submitted: April 10, 2019
- Operation: Air carrier
- Aircraft: [N559AS](https://openairdocs.org/aircraft/N559AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35178
- Aircraft time: 46,473 hours, 13,826 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: CR
- 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/ASAA2019041078936

## Discrepancy

L "PACK" LIGHT ILLUMINATED DURING RECALL @ CRUISE FL 340. EXTINGUISHED WHEN MASTER CAUTION RESET. PRESSURIZATION, DUCT PRESSURES, FLY DECK & CABIN TEMPS, & PACK TEMPS ALL NORMAL. GROUNDED - YES. REF B737-800 FIM TASK 21-53 TASK 809, PZTC #1 PREV FLT LOGGED RAM AIR ACT FAULT, BOTH PZTC BITE VERIFY TESTED GOOD W/O FAULTS. GVI LEFT AIR RAM INLET, NO OBSTRUCTIONS NOTED. VERIFIED LEFT PACK OPS CHECKED NORMAL ON GND W/O FAULTS.

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