# SDR 9706826638

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 2, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N638US
- Make and model: Boeing 747251B
- Aircraft serial: 23549
- Engine: Pwa JT9D7R4G2
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Controller
- Part number: 7880461
- Condition: Malfunctioned
- Location: Nr 1 Engine
- Part time: 43,334 hours
- Stage of operation: TO
- Nature of condition: O
- Precautionary procedure: C, D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9706826638

## Discrepancy

DURING TAKEOFF (PEK), THE NR 1 ENGINE EPR LAGGED.  TAKEOFF WAS ABORTED AT 40 KNOTS.  FLIGHT CREW TAXIED BACK TO DEPARTURE END OF RUNWAY AND DEPARTED.  MAINTENANCE REPLACED THE HIGH STAGE CONTROLLER ON NR 1 ENGINE.

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