3.6. Aircraft Icing Operations - Taxi
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[This section is not intended to replace any of your company requirements or the requirements specified in the CARs for Aircraft Icing Operations. However, if in your operation the crew has a role in dealing with icing after taxiing has begun, detail those actions here.]
Regardless of any previous actions taken to inspect for or remove frost, ice, or snow, if the crew suspects that such contamination is present, the following inspections shall be made immediately prior to take-off:
- The PF and PNF shall each visually inspect the representative surface that is visible from their respective pilot seats.
- If the Captain deems it appropriate, the PNF shall carry out an external inspection of the critical surfaces.
Should any frost, ice, or snow be found to be adhering to critical surfaces, the aircraft shall not take-off. Rather arrangements shall be made to de-ice the aircraft.
[It may be useful for your operation to discuss techniques for dealing with snow and/or slush on manoeuvring areas. Consider such things as taxi speed, use of brakes, use of zero thrust and reverse thrust. The following is an example for a fictitious turboprop aircraft. Insert the procedures for your type of aircraft and your operation. In particular, the procedures must be in concert with the AFM.]
To the extent practical avoid taxiing through slush or loose snow. Under no circumstances should the aircraft be taxied through packed snow drifts that are deeper than the distance from the bottom of the wheel hub to ground. For dealing with slush or loose snow during taxi the following practises are recommended:
- Speed must be managed to minimize slush or snow impinging on flaps, landing gear doors, propellers, intakes, and brakes. Too high a taxi speed may result in contaminants spraying on the flaps. Too slow a taxi speed may cause snow to be pulled into the propeller.
- Speed must be sufficient to prevent the aircraft from bogging down in snow.
- Avoid use of reverse thrust as it may cause contaminants to become airborne and impinge on the aircraft. To reduce speed use zero thrust and judicious braking.
- When the aircraft is stopped set the engines and propellers to minimize blowing of snow and slush on to the aircraft.
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