COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Mitsubishi MU-2 Series Aeroplanes AD/MU-2/53 Amdt 1 Ice Detector System Installation 4/95 Applicability: MU-2B-25/-26/-26A/-40 S/N 313SA, 321SA, 348SA through 459SA. (Refer to SB No 080/30-003A). MU-2B-35/-36/-36A/-60 S/N 652SA, 661SA, 698SA through 1569SA. (Refer to SB No 080/30-003A). MU-2B-10/-15/-20/-25/-26 S/N 008 through 347 (except S/N 313, 321). (Refer to SB No 217A). MU-2B-30/-35/-36 S/N 501 through 696 (except S/N 652,661). (Refer to SB No 217A). Requirement: 1. Install Ice Detector System in accordance with the requirements of MU-2 Service Bulletin No 080/30-003A or No 217A as applicable. 2. Until Compliance with Requirement 1, a placard is to be installed in clear view of the pilot stating: "FLIGHT INTO KNOWN OR FORECAST ICING CONDITIONS IS PROHIBITED" and Insert a "P" amendment to the Limitations Section of the Flight Manual. This amendment is available from District Airworthiness Offices. Note: The placard is only required until the modification has been incorporated. Compliance: 1. Prior to 31 December 1995. 2. Prior compliance with the initial issue of this AD satisfies Requirement 2. Background: Failure to detect ice build-up on the aircraft by the pilot may result in failure to use or the improper use of the anti-ice/de-ice equipment. This could result in loss of control of the aircraft. The Directive was issued to prevent loss of control of the aircraft as a result of undetected ice accretion. This amendment requires installation of an ice detector system as terminating action.