# SDR DALA2025041703031

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 14, 2025
- Submitted: April 18, 2025
- Operation: Air carrier
- Aircraft: [N121DU](https://openairdocs.org/aircraft/N121DU), registered now
- Make and model: Airbus BD-500-1A10
- Registry model: [Airbus BD-500-1A10](https://openairdocs.org/model/airbus-canada-ltd-ptnrsp-bd-500-1a10) (OpenAirDocs)
- Aircraft serial: 50040
- Aircraft time: 15,282 hours, 6,903 cycles
- System (JASC): [7500 · Engine Bleed Air System](https://openairdocs.org/jasc/7500)
- Part: Bleed Air Sys
- Condition: Odor
- Location: Nr 1
- Stage of operation: DE
- 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/DALA2025041703031

## Discrepancy

ON DECENT FA'S IN AFT GALLEY SMELLED A BRIEF DIRTY SOCK/MUSTY SMELL. ABOUT 10 MIN LATER SYMPTOMS OF NAUSEA, HEADACHE AND BURNING OF NOSTRILS AND CHEST OCCURED. SYMPTOMS STAYED THROUGH THE REMAINDER OF THE FLIGHT. #2 PACK WAS ON MEL SO ONLY BLEED #1 WAS PRODUCING AIR TO ONLY #1 PACK. APU DID NOT GET TURNED ON UNTIL TAXI IN. REMOVED THE ACCESS PANELS OVER LPC-3 (OUTBOARD) LPC 2 (INBOARD) PLUGS OVER LOW PRESSURE COMPRESSOR SIDE. REMOVED THE FOLLOWING BORO PLUGS. LPC-3, LPC-2, HPC-1, HPC-2, HPC-3, HPC-4, HPC-6, HPC -7, HPC-8. REMOVED THE CRANK PAD COVER PER WC 0550-6001 STEP 7. A(1) AND STEP A(2) (C.D 912451). PREFORMED BOROSCOPE OF LPC, HPC AND #3 BEARING COMP PER AMDS WORKCARD 0550-6001. FOUND OIL STAINING ON HPC STAGES 2 AND 3 PICS SENT TO PROP OPS (QC 5197). REINSTALLED PANELS AND BORO PLUGS PER A220 AMP 72-34 (B.B 940558 ) REF LOG 7149103 FOR RNG BLEED MEL + 7149104 FOR ERA. C/W WORK CARDS 0550-2001, 0550-2003, 0550-9001-A220, 0550-6001. SMELL ISOLATED TO ENG 1 BLEED. (LP# 7149100, 7149103)

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