# SDR IPXA2022051795208

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 16, 2022
- Submitted: August 2, 2022
- Operation: Air carrier
- Aircraft: [N633UP](https://openairdocs.org/aircraft/N633UP), registered now
- Make and model: Boeing 747-8F
- Registry model: [Boeing 747-8F](https://openairdocs.org/model/boeing-747-8f) (OpenAirDocs)
- Aircraft serial: 65774
- Aircraft time: 295 hours, 76 cycles
- System (JASC): [3400 · Navigation System](https://openairdocs.org/jasc/3400)
- Part: B-Nut
- Condition: Loose
- Location: Adc
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/IPXA2022051795208

## Discrepancy

**ATB** AIR TURNBACK REF ITEM 1 ALT DISAGREE ON EICAS.  REF ITEM 1 ALT DISAGREE ON EICAS NOTED BY MAINTENANCE SDR GENERATED.FOUND LOOSE B NUT AT FO MAIN STATIC PRESSURE AIR DATA MODULE DM14750. TIGHTENED IN MM20-51-01. PERFORM LOW LEVEL LEAK CK OF FO STATIC SYS IN MM 34-11-00-795-072. TET NML. CLR DEFERAL.

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