# SDR TWAA9721001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 10, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N9407R
- Make and model: Doug DC-9-83
- Registry model: [Doug DC-9-83](https://openairdocs.org/model/douglas-dc-9-83) (OpenAirDocs)
- Aircraft serial: 49400
- System (JASC): [2120 · Air Distribution System](https://openairdocs.org/jasc/2120)
- Part: Air Distrbution
- Condition: Smoke
- Location: Cockpit
- Stage of operation: AP
- Nature of condition: B
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/TWAA9721001

## Discrepancy

STL - FLT 306 - ON FINAL APPROACH WITH ENGINE TAIL ANTI-ICE ON, A SMALL AMOUNT OF SMOKE VAPOR APPEARED IN THE COCKPIT. CYCLED TAIL ANTI-ICE SWITCH WITH AIR TO TAIL AND WINGS, VISUALLY CHECKED COCKPIT UNDER GLARESHIELD, INSPECTED E/E COMPARTMENT.  NO SMOKE, VAPOR OR ODOR WAS DETECTED.  OPERATION CHECKS ALL NORMAL.  (M)

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