Harbin Y12 Series AeroplanesHarbin Y12 Series Aeroplanes

Harbin Y12 Series Aeroplanes

AD/Y12/8 (Continued)

During flight, severe icing conditions that exceed those for which the airplane is certificated shall be determined by the following visual cues. If one or more of these visual cues exists, immediately request priority handling from Air Traffic Control (ATC) to facilitate a route or an altitude change to exit the icing conditions:

Unusually extensive ice accumulation on the airframe and windshield in areas not normally observed to collect ice.

b. Accumulation of ice on the lower surface of the wing aft of the protected area.

c. Accumulation of ice on the engine nacelles and propeller spinners farther aft than normally observed.

Since the autopilot, when installed and operating, may mask tactile cues that indicate adverse changes in handling characteristics, use of the autopilot is prohibited when any of the visual cues specified above exist, or when unusual lateral trim requirements or autopilot trim warnings are encountered while the airplane is in icing conditions.

All wing icing inspection lights must be operative prior to flight into known or forecast icing conditions at night. (NOTE: This supersedes any relief provided by the Master Minimum Equipment List).”

3. Revise the CAAC and FAA-approved AFM by incorporating the following into the Normal Procedures Section of the AFM: