# SDR UIEA2021052301166

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 23, 2021
- Submitted: May 24, 2021
- Operation: Air carrier
- Aircraft: [N1373A](https://openairdocs.org/aircraft/N1373A), registered now
- Make and model: Boeing 767-31K
- Registry model: [Boeing 767-31K](https://openairdocs.org/model/boeing-767-31k) (OpenAirDocs)
- Aircraft serial: 27205
- Aircraft time: 103,936 hours, 22,084 cycles
- System (JASC): [4990 · APU Oil System](https://openairdocs.org/jasc/4990)
- Part: Solenoid Valve
- Part number: 38761661
- Part serial: T5273
- Condition: Faulted
- Location: Apu
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UIEA2021052301166

## Discrepancy

APU RELIABILITY COLD START UNSUCCESSFUL AFTER 3 ATTEMPTS ST -52C FL370. APU INOP.(<P>TRANSFERRED TO MDDR # 147412 IAW MEL 49-11-01A, CAT C, DUE DATE 02JUN21. EH 1526Z.</P><P>ONT MX, 23MAY, LP 1476796, ITEM M4: REMOVED AND REPLACED DE-OIL SOLENOID VALVE IAW AMM 49-27-08. PREF. FIM 49-11 FT 958 APU OPERATES NORMALLY, HOWEVER APU BITE PROCEDURE PRODUCES A FAULT CODE "34" AT THE BOX. </P><P>ITEM M5: PERFORMED FIM TASK 49-11 FT 958 & RECEIVED FAULT CODE 34 ON ECU UNIT. PERFORMED INSPECTION OF STARTER IAW AMM 49-41-01, FOUND POSITIVE ELECTRICAL CABLE LOOSE. RE-SECURED IAW AMM 49-41-01. APU OPS CHECK PER AMM 49-11-00 CHECKED GOOD. NO DEFECTS NOTED. THIS CLEARS MDDR 147412. PLACARD REMOVED. MCC NOTIFIED. CD 0156Z</P>)

---
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.