# SDR CALA2026080918415

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 6, 2026
- Submitted: August 10, 2026
- Operation: Air carrier
- Aircraft: [N68452](https://openairdocs.org/aircraft/N68452), registered now
- Make and model: Boeing 737924ER
- Aircraft serial: 40005
- Aircraft time: 44,177 hours, 16,256 cycles
- Engine: Cfmint CFM567B27
- System (JASC): [8011 · Engine Starter](https://openairdocs.org/jasc/8011)
- Part: Switch
- Condition: Faulted
- Location: Zone 200
- Stage of operation: TO
- How discovered: O
- Nature of condition: B
- Precautionary procedure: C
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2026080918415

## Discrepancy

DURING THE TAKEOFF ROLL, SMELLED SMOKE.  FIRST OFFICER SAW SMOKE COMING FROM THE CAPTAIN SIDE OF COCKPIT.   CAPTAIN REJECTED THE TAKEOFF ROLL & RETURNED TO THE GATE.   AFTER INSTALL OF NEW START VALVE ON NR 1 ENG, APU BLEED WAS APPLIED TO THE AIRCRAFT AND #1 ENGINE AUTO ROTATED.  START SWITCH WAS IN OFF POSITION & ENGINE BLEED WAS OFF, BUT ENG AUTO ROTATED ON 2ND ATTEMPT.  CYCLED NR 1 ENG START SWITCH AND ENGINE DID NOT AUTO ROTATE.  POSSIBLY THE CAUSE OF FUMES BACK BLEEDING INTO THE PNEUMATIC SYSTEM.  R & R NR 1 ENG STARTER SWITCH IAW AMM 80-11-00. INSTALLATION TEST IS GOOD IAW AMM  80-11-00-730-801-F00. PERFORMED ENG RUN OF ENG 1 IAW AMM 71-00-00-800-808-F00 FOR 5 MINS. ENG RUN WAS SATISFACTORY.

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