# SDR USAASB97087

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 21, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N336US](https://openairdocs.org/aircraft/N336US), registered now
- Make and model: Boeing 737301
- Aircraft serial: 23233
- System (JASC): [7714 · Engine RPM Indicating System](https://openairdocs.org/jasc/7714)
- Part: N1 Speed Sensor
- Part number: 3200940010
- Condition: Failed
- Location: Nr 2 Engine
- Stage of operation: CL
- Nature of condition: O
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/USAASB97087

## Discrepancy

PIT - FL 1052 - DURING CLIMB-OUT FROM PIT, THE NR 2 ENGINE N1 FLUCTUATED3-5 PERCENT.  FLIGHT RETURNED TO FIELD AT PIT AND LANDED WITHOUT FURTHER INCIDENT.  MAINTENANCE REMOVED AND REPLACED THE NR 2 ENGINE N1 FAN SPEED SENSOR.  RAN ENGINE AT TAKEOFF POWER.  ALL INDICATIONS NORMAL WITH NO FLUCTUATIONS NOTED.  ALL WORK ACCOMPLISHED IAW WITH MM 77-12-01.  (M)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.