# SDR 99UAL900361

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 6, 1999
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N7441U
- Make and model: Boeing 727222
- Aircraft serial: 21895
- Engine: Pwa JT8D15
- System (JASC): [3414 · Airspeed/Mach Indicator](https://openairdocs.org/jasc/3414)
- Part: Switch
- Part number: B070710007
- Condition: Failed
- Location: E&E Bay
- Component: Lear Seigler
- Stage of operation: TO
- Nature of condition: J
- Precautionary procedure: C, D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99UAL900361

## Discrepancy

ABORTED TAKEOFF AT 90 KNOTS DUE TO MACH AIRSPEED WARNING.  *S/D*  MAINTENANCE REPLACED THE NR 1 MACH AIR SPEED WARNING SWITCH.  NO FURTHER PROBLEMS REPORTED.

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