# SDR CALA2023082802655

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 25, 2023
- Submitted: August 29, 2023
- Operation: Air carrier
- Aircraft: [N77012](https://openairdocs.org/aircraft/N77012), registered now
- Make and model: Boeing 777224
- Aircraft serial: 29860
- Aircraft time: 110,793 hours, 11,214 cycles
- System (JASC): [3600 · Pneumatic System](https://openairdocs.org/jasc/3600)
- Part: Precooler
- Part number: 23419921
- Condition: Cracked
- Location: Aft
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K, O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2023082802655

## Discrepancy

LOUD AIR NOISE COMING FROM #1 ENG EXHAUST.  WITH APU AIR ON INSPECTED AND FOUND #1 ENGINE PRECOOLER CRACKED AND LEAKING. ADDED PHOTO. REMOVED #1 ENG PRECOOLER ASSEMBLY. REF AMM 36-11-15. SECURED . TAPED OPEN DUCTS, FAMV, AND CONTROL PRESSURE SENSE LINE TO PRSOV. . PRECOOLER, AIRB OFF 25-3611-9-0007 8279 ON 25-3611-9-0007 8258 PRECOOLER, AIRB OFF 25-3611-9-0007 8279 ON 0000 INSTALLED #1 ENGINE PRE COOLER PER AMM 36-11-15-400-803-001.PERFORM LEAK CHECK. OPS CHECKS GOOD PARTS USED: 25-3611-9-0007,QTY :1 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1501971 SN OFF 8279

---
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.