# SDR CALA2025070806338

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 6, 2025
- Submitted: July 8, 2025
- Operation: Air carrier
- Aircraft: [N23983](https://openairdocs.org/aircraft/N23983), registered now
- Make and model: Boeing 787-9
- Registry model: [Boeing 787-9](https://openairdocs.org/model/boeing-787-9) (OpenAirDocs)
- Aircraft serial: 66140
- Aircraft time: 23,843 hours, 2,330 cycles
- System (JASC): [2121 · Air Distribution Fan](https://openairdocs.org/jasc/2121)
- Part: Cooling Fan
- Part number: 7010302H03S02
- Part serial: 2020061
- Condition: Failed
- Location: Zone 100
- Part time: 23,839 hours, 2,329 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: B
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2025070806338

## Discrepancy

EQUIP COOLING FWD FAN 2 FWD EE COOLING SUPPLY FAN 2 FAILURE. OR FWD EE COOLING SUPPLY FAN 2 FAILURE.  SUSPECT #2 FWD E&E SUPPLY FAN AT FAULT. REMOVED #2 FWD E&E COOLING SUPPLY FAN IAW DMC-B787-A-21-27-12-00A-520A-A AND FOUND FAN SPINNING FREELY BUT MAKING A SLIGHT BALLBEARING RATTLING SOUND WHEN SPUN BY HAND. INSTALLED NEW FWD E&E COOLING SUPPLY FAN IAW DMC-BDMC-B787-A-05-51-99-99A-282A-A WITH NO DEFECTS FOUND. NO FURTHER MAINT ACTION REQUIRED.

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