# SDR 2000UALA00287

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 24, 2000
- Submitted: October 4, 2000
- Operation: Air carrier
- Aircraft: N399UA
- Make and model: Boeing 737322
- Aircraft serial: 24674
- Aircraft time: 29,680 hours, 19,876 cycles
- Engine: Ge CFM56*
- System (JASC): [3260 · Landing Gear Position and Warning](https://openairdocs.org/jasc/3260)
- Part: Squat Switch
- Part number: 806002
- Condition: Inoperative
- Location: Mlg
- 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/2000UALA00287

## Discrepancy

TCAS FAIL LIGHT ILLUMINATED, LNAV AND VNAV WOULD NOT ENGAGE, ACARS STUCK IN GROUND MODE, AUTO THROTTLES REMAINED IN THROTTLE HOLD.  *S/D*  REPLACED M990 GROUND SENSING SQUAT SWITCH.  SYSTEM CHECKED OK.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.