# SDR UIEA2023042900393

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 26, 2023
- Submitted: May 1, 2023
- Operation: Air carrier
- Aircraft: [N451PA](https://openairdocs.org/aircraft/N451PA), registered now
- Make and model: Boeing 747-46NF
- Registry model: [Boeing 747-46NF](https://openairdocs.org/model/boeing-747-46nf) (OpenAirDocs)
- Aircraft serial: 30809
- Aircraft time: 93,069 hours, 15,704 cycles
- System (JASC): [3230 · Landing Gear Retraction/Extension System](https://openairdocs.org/jasc/3230)
- Part: Sequence Valve
- Part number: 2670296
- Part serial: 2001
- Condition: Unknown
- Stage of operation: TO
- How discovered: V
- Nature of condition: J, Z
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2023042900393

## Discrepancy

LOG PAGE 1779113 ITEM # 2 NOSE GEAR FAIL TO FULLY RETRACT AND STOW.(<P>REF 744 AMM 32-34-08. PERFORMED TROUBLESHOOTING AND REPLACED NOSE GEAR DOOR OPERATED SEQUENCE VALVE AS PER 744 AMM 32-34-05/401, OPS CHECKED NIL EFFECTIVE. LP 1779115 ITEM #7: AMM 32-34-00/001 CONTINUE T/S & REPLACED NOSE GEAR LOCK ACTUATOR AS PER 744 AMM 32-34-03/401, STILL NIL EFFECTIVE. FURTHER T/S AND REPLACED NOSE LANDING GEAR OPERATED SEQUENCE VALVE AS PER 744 AMM 32-34-07/401. LOG PAGE ITEM #8: NOSE LANDING GEAR AND DOOR EXTENSION AND RETRACTION OPERATIONAL CHECKED GOOD AS PER 744 AMM 32-34-00/501. SYSTEM OKAY TO RETURN TO SERVICE.</P>)

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