# SDR CALA2025060905367

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 6, 2025
- Submitted: June 9, 2025
- Operation: Air carrier
- Aircraft: [N15712](https://openairdocs.org/aircraft/N15712), registered now
- Make and model: Boeing 737724
- Aircraft serial: 28783
- Aircraft time: 81,388 hours, 28,978 cycles
- System (JASC): [2170 · Humidity Control System](https://openairdocs.org/jasc/2170)
- Part: Coalescer Bag
- Part number: 21D102
- Condition: Faulted
- Location: Zone 100
- Stage of operation: IN
- How discovered: 9
- Nature of condition: B
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2025060905367

## Discrepancy

EXCESSIVE ODOR ON TAKOFF ODOR CONTINUED FOR 10 MINS BEFORE DISSI PATING DEBRIEFED INBOUND FLT CREW AND ADDED FORM 46-6020 IN PICS. PULLED AFT WALL OF FORWARD CARGO PIT. REPLACED RIGHT RECIRCULATION FILTER, PER AMM 21-25-01-000-801. INSTALLED FWD CARGO PIT AFT WALL. *INFO NOTE THAT #1 ENG COMPRESSOR WASH WAS COMPLETED DURING OVERNIGHT MAINT PRIOR TO INBOUND FLT TO ORD.  WORKED ODOR CONDITION IAW AMM 05-51-26.  REMOVED AND REPLACED LH PACK COALESCER BAG IAW AMM 21-51-05 - LEAK CHK GOOD.  RAN BOTH ADD EMP:U010764 ENGINES, BOTH PACKS, AND BOTH BLEEDS IN MULTIPLE CONFIGURATIONS. RAN BOTH PACKS OPERATED IN FULL COLD AND FULL NOT WITH ENG BLEED SOURCE FOR OVER 10 MINUTES WITH NO ODOR NOTED IN FLT DECK.  OK F/SVC.

---
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.