# SDR COZA20171103117

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 31, 2017
- Submitted: November 4, 2017
- Operation: Air carrier
- Aircraft: N732KA
- Make and model: Boeing 737-500
- Registry model: [Boeing 737-500](https://openairdocs.org/model/boeing-737-500) (OpenAirDocs)
- Aircraft serial: 25065
- Aircraft time: 45,500 hours, 39,140 cycles
- System (JASC): [4930 · APU Engine Fuel and Control](https://openairdocs.org/jasc/4930)
- Part: Fuel Control
- Part number: 36177501
- Part serial: P108CQC
- Condition: Failed
- Location: Apu
- Component: Apu, Honeywell
- Component part number: 380428101
- Stage of operation: IN
- How discovered: O
- Nature of condition: P
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/COZA20171103117

## Discrepancy

APU SHUTDOWN AFTER AN HOUR OF RUN TIME ON THE GROUND.  PUT A PRESSURE GAUGE IN THE FUEL LINE BETWEEN THE FUEL CONTROL AND FUEL ATOMIZER.  FOUND FUEL PRESSURE AT 25 PSI WITH A REQUIREMENT FOR 50-60 PSI.  REMOVED FUEL CONTROL UNIT AND FOUND DRIVE SHAFT SHEARED.  REPLACED THE FUEL CONTROL UNIT AND OPERATIONAL CHECK NORMAL.

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