# SDR IPXA2024050811638

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 4, 2024
- Submitted: May 8, 2024
- Operation: Air carrier
- Aircraft: [N406UP](https://openairdocs.org/aircraft/N406UP), registered now
- Make and model: Boeing 757-24APF
- Registry model: [Boeing 757-24APF](https://openairdocs.org/model/boeing-757-24apf) (OpenAirDocs)
- Aircraft serial: 23728
- Aircraft time: 37,773 hours, 25,526 cycles
- System (JASC): [3230 · Landing Gear Retraction/Extension System](https://openairdocs.org/jasc/3230)
- Part: Landing Gear
- Part number: BACV10CD13
- Part serial: BNXXX
- Condition: Warning Message
- Stage of operation: CR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2024050811638

## Discrepancy

GEAR DISAGREE EICAS MESSAGE WHEN GEAR LOWERED ON APPROACH. ACCOMPANIED BY LDG GEAR MONITOR STATUS MESSAGE.  QRH PROCEDURE RAN IN ENTIRETY FOUND LEFT SYSTEM RETURN CHECK VALVE P/N BACV10CD13 FOR THE NLG EXTENSION & RETRACTION BYPASSING. R&R BOTH LEFT SYSTEM RETURN CHECK VALVES FOR THE NLG EXTENSION & RETRACTION IAW AMM 20-11-00. PERFORMED NLG SWING PER AMM 32-34-00, OPS AND LEAK CHECK GOOD. REMOVED NLG JACK FROM A/C PER AMM 07-11-01.

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