# SDR PCSA12070502

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 7, 2005
- Submitted: January 2, 2006
- Operation: Air carrier
- Aircraft: N598AJ
- Make and model: Boeing 727212
- Aircraft serial: 21947
- System (JASC): [3417 · Air Data Computer](https://openairdocs.org/jasc/3417)
- Part: Adc
- Part number: HG480B100
- Part serial: N617
- Condition: Failed
- Location: Nr 1
- Stage of operation: TO
- How discovered: O
- Nature of condition: O
- Precautionary procedure: C, D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/PCSA12070502

## Discrepancy

FLIGHT 8216 DURING TAKEOFF FROM CUR CREW REPORTED CAPTAIN'S AIRSPEED INDICATION SHOWED NO AIRSPEED INDICATION, THE F/O'S AIRSPEED INDICATOR WAS SHOWING 80 KNOTS, CREW ABORTED THE TAKEOFF AND RETURNED TO THE BLOCK WITHOUT ANY FURTHER INCIDENT.  MAINTENANCE TROUBLESHOT CAPTAIN'S AIRSPEED INDICATION SYSTEM AND FOUND THE NR 1 ADC AT FAULT, THE NR 1 AIR DATA COMPUTER WAS REMOVED AND REPLACED IAW BOEING 727 MM CH 34-12-11, SYSTEM WAS OPERATIONALLY CHECKED IAW AMERIJET WORK CARD 816 AND 817, OPERATIONALLY CHECKED NORMAL.  THE AIRCRAFT WAS RETURNED TO SERVICE.

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