# SDR CALA2026042015518

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 19, 2026
- Submitted: April 20, 2026
- Operation: Air carrier
- Aircraft: [N788UA](https://openairdocs.org/aircraft/N788UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26942
- Aircraft time: 115,716 hours, 15,113 cycles
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Air Filter
- Part number: 21FA414G
- Condition: Odor
- Location: Zone 100
- 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/CALA2026042015518

## Discrepancy

ON TAKEOFF GOT A STRONG ODOR WITH A OIL TYPE ODOR.  ALL INDICATIONS WORK WITH L/P 8594308. NORMAL AND ODOR DISSAPATED QUICKLY.   T/S IAW FIM 21-00, TASK 808,  INSPECTED THE FOLLOWING AREAS; PAX CABIN, GALLEYS, OVENS, LAVS, VENT FANS, CARGO COMPARTMENTS, RECIRC FAN & MIX MANIFOLD AREA, LOW PRESS GND CONNECTIONS, ECS BAYS, ENGINES, ENG INLETS, FAN, LPC INLET STATOR. WITH NO DEFECT NOTED. NO SIGNS OF OIL CONTAMINATION NOTED. DURING OUR FLT DECK CHECKS, WITH APU BLEED ON,  TRIED MULTIPLE COMBINATIONS OF PACKS, VALVES, FANS ON & OFF. ODOR OF DIRTY SOCKS WAS VERY FAINT, ALMOST UNNOTICEABLE AFTER A FEW MINS.  UNABLE TO ISOLATE ACTUAL SOURCE OF ODOR. 4 EA LOWER RECIRCULATION AIR FILTERS R & R IAW AMM 21-25-08/401.

---
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.