# SDR KCSA2021113011

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 30, 2021
- Submitted: December 2, 2021
- Operation: Air carrier
- Aircraft: [N707CK](https://openairdocs.org/aircraft/N707CK), registered now
- Make and model: Boeing 747-4B5
- Registry model: [Boeing 747-4B5](https://openairdocs.org/model/boeing-747-4b5) (OpenAirDocs)
- Aircraft serial: 26395
- Aircraft time: 100,811 hours, 17,829 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Valve
- Part number: 4203651
- Part serial: 1292A
- Condition: Unserviceable
- Stage of operation: DE
- How discovered: O
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/KCSA2021113011

## Discrepancy

EQUIPMENT COOLING. REMOVED AND REPLACED SMOKE/OVERRIDE VALVE IAW AMM 21-58-06. OPERATIONS CHECK GOOD PER AMM 45-10-00 AND AMM 21-26-00. RESET INOPERATIVE NAVIGATION DISPLAY AND FIRST OFFICER NAVIGATION DISPLAY. PERFORMED WEATHER RADAR SYSTEM SELF TEST IAW AMM 34-43-00 CONFIGURATION 4. PASSED. VARIOUS INSTRUMENT FAILURES DUE TO EQUIPMENT OVERHEAT. PERFORMED INTEGRATED DISPLAY SYSTEM ADJUSTMENT TEST IAW AMM 31-61-00. PASSED.

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