# SDR UIEA200300013

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 7, 2003
- Submitted: April 16, 2003
- Operation: Air carrier
- Aircraft: N523MC
- Make and model: Boeing 747-2D7B
- Registry model: [Boeing 747-2D7B](https://openairdocs.org/model/boeing-747-2d7b) (OpenAirDocs)
- Aircraft serial: 21782
- System (JASC): [7714 · Engine RPM Indicating System](https://openairdocs.org/jasc/7714)
- Part: Sensor
- Part number: 473271
- Condition: Malfunctioned
- Location: Nr 1 Engine
- Stage of operation: DE
- How discovered: O
- Nature of condition: N
- Precautionary procedure: E
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA200300013

## Discrepancy

JFK/MXP - INFLIGHT ENGINE SHUTDOWN.  NR 1 ENGINE N1 EXCEEDANCE DURING DESCENT PROFILER WHILE A/T ENGATED AND THROTTLES MOVING FORWARD.  N1 136.9 PERCENT FOR 11 SECONDS.  EGT 666, N2 92.4, F/F 3218.  NR 1 ENGINE SHUTDOWN IAW FHB.  PERFORMED ENGINE OVERSPEED INSPECTION IAW 72-00-00 PAGE 680.  NIL FOUND.  SUSPECTED BAD N1 TRANSMITTER.  REMOVED AND REPLACED NR 1 ENGINE N1 FAN SPEED SENSOR IAW 77-12-01-401.  OPERATED NR 1 ENGINE MAX POWER ASSURANCE TEST 4.  ALL FIGURES WITHIN LIMITS.  N1 INDICATION NORMAL IAW 71-00-00.  (M)

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