# SDR 9724269621

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 25, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N621NW
- Make and model: Doug DC-9-32
- Registry model: [Doug DC-9-32](https://openairdocs.org/model/mcdonnell-douglas-dc-9-32) (OpenAirDocs)
- Aircraft serial: 47544
- System (JASC): [3010 · Airfoil Anti/De-ice System](https://openairdocs.org/jasc/3010)
- Part: Control Unit
- Condition: Failed
- Location: Left
- Stage of operation: CL
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/9724269621

## Discrepancy

DURING CLIMBOUT, THE LEFT ICE PROTECTION TEMPERATURE HIGH LIGHT ILLUMINATED ONCE THE ANTI-ICE SWITCH WAS TURNED TO THE OFF POSITION.  FLIGHT CREW CONSULTED WITH MAINTENEANCE CONTROL, RETURNED TO ORIGINATION AND LANDED WITHOUT INCIDENT.  MAINTENANCE REPLACED THE THERMO-ELECTRIC CONTROL UNIT, THE LEFT HIGH TEMPERATURE SENSOR, AND THE LEFT ANTICIPATOR AND THERMOSTAT, OPERATIONAL CHECK OK.

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