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Moving surfaces like the flaps and spoilers can be jammed

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Pitot tubes and static ports can be blocked

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Airplane doors can be jammed due to heavy ice around the door

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Icing can reduce aerodynamic performance and controllability.

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Movement of the Landing gear and nose steer can be restricted because of icing

Issue II 02.07.2009  Rev. 0

CLEAN AIRCRAFT CONCEPT
3.1  Policy
Take-off shall not commence when ice, snow, slush or frost is adhering to the wings, propellers, control surfaces, engine inlets or other critical surfaces of an aircraft. This is known as the “Clean Aircraft Concept”. The rule is “MAKE IT CLEAN AND KEEP IT CLEAN”.
3.2  The Clean Aircraft Concept is necessary because airplane performance is based on clean structure. An airplane is designed using the predictable effects of airflow over clean wings. Ice, snow or frost adhering to wings disturbs this airflow, and results in reduced lift, increased drag, increased stall speed, and may cause an abnormal pitch characteristic.
Issue II 02.07.2009  Rev. 0

RESPONSIBILITIES

4.1  Operations
4.1.1  DIRECTOR OPERATIONS is responsible for the formulation and implementation of a DGCA approved Ground de-icing/anti-icing program. This involves making detailed policy guidelines and training manuals. The GM Training is responsible for ensuring that all cockpit crew are familiar, trained, and current with the de-icing/anti-icing program and are competent to carry out operations in ground icing conditions. He is responsible for ensuring that all aircraft meet the clean aircraft concept during operations in ground icing conditions.
4.1.2  RESPONSIBILITY OF THE PIC. The pilot in command is responsible for ensuring that the aircraft meets the “clean aircraft concept “before undertaking any flight under ground icing conditions.

4.2  Maintenance
4.2.1  GM Maintenance is responsible for the formulation and implementation of a DGCA approved Ground de-icing/anti-icing program for the maintenance staff. This would include making detailed policy guidelines and training manuals. He is to ensure that all concerned maintenance staff are trained and current to carry out de-icing/anti-icing operations. In consultation with the operations staff, he is responsible to ensure that the aircraft is handed over to the flight crew in a clean configuration.
4.2.2  The person technically releasing the aircraft is responsible for the performance and verification of the results of the de-/anti-icing treatment. The responsibility of accepting the performed treatment lies, however, with the Commander. The transfer of responsibility takes place at the moment the aircraft starts moving under its own power.
Issue II 02.07.2009  Rev. 0

NECESSITY FOR DE-ICING/ANTI-ICING ON THE GROUND
　
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