# SDR CALA2026070517544

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 5, 2026
- Submitted: July 6, 2026
- Operation: Air carrier
- Aircraft: [N69816](https://openairdocs.org/aircraft/N69816), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 42176
- Aircraft time: 39,562 hours, 14,463 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Filter
- Part number: P199753
- Condition: Odor
- Location: Zone 100
- Stage of operation: TX
- How discovered: O
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026070517544

## Discrepancy

PILOT REPORTS ODD ODOR WHEN RIGHT PACK SELECTED, AFTER LT PACK FAILURERAN ON RT PACK ONLY NO FOUL ODOR DETECTED FURTHER T/S IS REQUIRED RAN LT & RT PACK ON APU BLEED AIR NO ODOR NOTED. STARTED LT ENG FOR IDLE RUN & OPS LT PACK ON LT ENG BLEED NO ODOR NOTED. STARTED RT ENGINE AND OPS RT PACK ON RT ENG BLEED & NOTED ODOR ON PACK INTIAL START UP. THEN ODOR INTENSITY INCREASED WHEN ADDING MORE BLEED PSI WITH APU BLEED AND LT ENG BLEED. ODOR DECREASES IN INTENSITY WITH LEFT PACK OPERATING. RECIRC FANS WERE IN AUTO. SUGGEST ENG RUN AT PART POWER IN CONFIGURATIONS RECOMMENDED BY FIM TO ISOLATE CAUSE REF FIM 21-00 TASK 806, 21-00 TASK 801. PERFORMED GVI OF LT & RT PACK BAYS NOT FAULTS NOTED. NO LEAKS NOTED FROM EITHER ENG DRAIN MASTS. ALSO CONDITIONAL INSPECTION 05-51-26-800-801-C1 NEEDS TO BE COMPLETED. NOTE STEPS CAN BE SKIPPED DEPENDING ON TOMC APPROVAL AND EVENT DETAILS.  REF FIM 21-00 TASK 806, FIM 21-00 TASK 801, AMM 05-51-26-800-801-C1.  IAW AMM 21-00-00 INSPECTED AND OPERATED GALLEY EQUIPMENT, LIGHTS AND IFE, NO ODORS FOUND. OPERATED ENGINES, APU, PACKS AND BLEEDS IN ALL DIFFERENT CONDITIONS ISOLATING SOURCES & USERS TO ATTEMP TO PRODUCE ANY ODOR.  R & R BOTH RECIRC FILTERS REF AMM 21-25-01 COMPLETING AMM 05-51-26,

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