# SDR 2023FA0000354

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 6, 2023
- Submitted: July 6, 2023
- Operation: General aviation
- System (JASC): [7300 · Engine Fuel and Control](https://openairdocs.org/jasc/7300)
- Part: Heat Exchanger
- Part number: UNKNOWN
- Condition: Unknown
- Stage of operation: NR
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2023FA0000354

## Discrepancy

HEAT EXCHANGER UNITS RETURN WITH LEAKING CONDITION DURING ENGINE TEST AND INITIAL INVESTIGATION FOUND DEFECT CAUSED BY CONTAMINATED TESTING OIL WITH WATER CONTENT. THE TESTING OIL WAS CONTAMINATED BY THE FAILING OF TEST RIG'S CHILLER SYSTEM EXCHANGER LEAKS WATER INTO THE TEST RIG OIL TANK. IMMEDIATE CONTAINMENT ACTION WAS TAKEN TO FIXED THE TEST RIG AND CHANGED ALL CONTAMINATED OIL. RECALLED ALL AFFECTED UNITS AND CARRIED OUT REWORK TO REMOVE ALL CONTAMINANTS OR REPLACE NEW MATRIX FOR FAILED UNITS. TYPE OF PART NUMBER AFFECTED: IDG OIL COOLER: 45731-1393, 45731-1391 (CMM 73-11-64), SERVO FUEL HEATER: 45731-1386, 45731-1385 (CMM 73-21-84), FUEL / OIL HEAT EXCHANGER: 47111-1203, 47111-1204 (CMM79-21-15), OIL/FUEL HEAT EXCHANGER 47111-1203, (CMM 79-21-26), HEATER FUEL SERVO: 45731-1382 (CMM 73-11-77).

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