AD/Y12/8 - Aircraft Flight Manual, Flight into Icing Conditions (Cth)

AIRWORTHINESS DIRECTIVE For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

Harbin Y12 Series Aeroplanes

AD/Y12/8 Aircraft Flight Manual, Flight into Icing Conditions 3/2003

Applicability: All Y12II aeroplanes.

Requirement: 1. Revise the CAAC and FAA approved Airplane Flight Manual (AFM) by incorporating the following into the Limitations Section of the AFM:

"Except for certain phases of flight where the AFM specifies that de-icing boots should not be used (e.g. take-off, final approach, and landing), compliance with the following is required.

1. Wing and Tail Leading Edge Pneumatic De-icing Boot System, if installed, must be activated:

1. At the first sign of ice formation anywhere on the aircraft, or upon annunciation from an ice detector system, whichever occurs first; and

ii. The system must either be continued to be operated in the automatic cycling mode, if available; or the system must be manually cycled as needed to minimize the ice accretion on the airframe.

b. The wing and tail leading edge pneumatic de-icing boot system may be deactivated only after leaving icing conditions and after the airplane is determined to be clear of ice."