# SDR UIEA2022042000353

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 20, 2022
- Submitted: April 22, 2022
- Operation: Air carrier
- Aircraft: [N419MC](https://openairdocs.org/aircraft/N419MC), registered now
- Make and model: Boeing 747
- Aircraft serial: 28367
- Aircraft time: 106,562 hours
- System (JASC): [3200 · Landing Gear System](https://openairdocs.org/jasc/3200)
- Part: None
- Part number: 893501
- Part serial: NSN
- Condition: None
- Stage of operation: CL
- How discovered: O
- Nature of condition: E, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2022042000353

## Discrepancy

AFTER ROTATION, VIBRATION OCCURRED. AFTER GEAR RETRACTION, NOSE GEAR DOOR DID NOT RETRACT. COMPLIED WITH QRH AND RETURNED BACK TO MIA.(<P ><SPAN>REMOVED AND REPLACED ALT SQUAT SWITCH S801 REFERENCE AMM 32-61-01. ADJUSTED SQUAT SWITCH TARGET GAP TO MID RANGE .15. OPERATIONAL NORMAL REFERENCING AMM 32-61-01. PERFORMED NOSE GEAR INSPECTION, NO FAULTS FOUND REFERENCING AMM 05-51-31 P1A. </SPAN></P> / <P> </P>)

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