# SDR 0104589902

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 29, 2001
- Submitted: December 7, 2001
- Operation: Air carrier
- Aircraft: N952N
- Make and model: Doug DC-9-31
- Registry model: [Doug DC-9-31](https://openairdocs.org/model/douglas-dc-9-31) (OpenAirDocs)
- Aircraft serial: 47073
- Aircraft time: 81,735 hours, 99,066 cycles
- System (JASC): [3414 · Airspeed/Mach Indicator](https://openairdocs.org/jasc/3414)
- Part: Indicator
- Part number: 8020081104
- Part serial: 00733
- Condition: Reads High
- Location: Cockpit
- Stage of operation: TO
- How discovered: O
- Nature of condition: O
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/0104589902

## Discrepancy

DURING TAKEOFF ROLL, THE CAPTAIN NOTICED A DISCREPANT READING BETWEEN HIS AND FIRST OFFICER'S AIRSPEED INDICATORS.  NR 1 WAS INDICATING 110 KTS AND NR 2 INDICATED 80 KTS.  THE TAKEOFF WAS ABORTED SAFELY AND THE AIRCRAFT RETURNED TO THE GATE.  MAINTENANCE REPLACED THE NR 1 AIRSPEED INDICATOR AFTER CHECKING THAT ALL LINES AND CONNECTIONS WERE SECURE.  AIRCRAFT RETURNED TO SERVICE.

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