# SDR P5CA2021080300272

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 1, 2021
- Submitted: August 4, 2021
- Operation: Air carrier
- Aircraft: [N453PA](https://openairdocs.org/aircraft/N453PA), registered now
- Make and model: Boeing 747-46NF
- Registry model: [Boeing 747-46NF](https://openairdocs.org/model/boeing-747-46nf) (OpenAirDocs)
- Aircraft serial: 30811
- System (JASC): [7532 · Compressor Bleed Valve](https://openairdocs.org/jasc/7532)
- Part: Controller
- Part number: 79299910
- Part serial: 9808072
- Condition: Faulted
- Location: Bleed Valve
- Stage of operation: CL
- How discovered: O
- Nature of condition: G, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/P5CA2021080300272

## Discrepancy

DURING CLIMB OUT #1, #2 & #4 BLEED VALVE OFF LIGHT ILLUMINATED WITH BLEED SWITCHES SELECTED ON, CYCLED VALVES WITH NO RESOLUTION.(<P ><SPAN>REMOVED AND REPLACED #3 BLEED PRV CONTROLLER IAW B747 AMM 36-11-19, REMOVED AND REPLACED #3 PRSOV IAW B747 AMM 36-11-04, REMOVED AND REPLACED #2 PRSOV IAW B747 AMM 36-11-01, FOUND #3 PRVC MUSCLE AIR LINE LEAKING, REPLACED PACKING IAW B747 AMM 36-11-19. OPS CHECK OF #2 AND #3 PRSOV GOOD IAW B747 AMM 36-11-04, OPS CHECK OF #3 PRVC GOOD IAW B747 AMM 36-11-20.</SPAN></P> / <P> </P>)

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