AD/F50/93 - Propeller Blade De-icer Boot (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 39.001(1) of CASR 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.

Fokker F50 (F27 Mk 50) Series Aeroplanes AD/F50/93 Propeller Blade De-icer Boot 3/2006

Applicability: Fokker Aircraft B.V. Model F27 Mark 050, Mark 0502 and Mark 0604 aircraft equipped with Dowty Propellers (formerly Dowty Aerospace Gloucester) Type R.352 or R.410 series propellers. Requirement: 1. Check the maintenance records to determine whether Minnesota Mining and Manufacture Co. (3M) 1300L adhesive has been used to fit the de-icer assemblies (boots) to the propeller blades. If it has been positively established that Bostik 2402 adhesive has been used, no further action is required by this directive.

2. If 3M 1300L adhesive has been used, inspect the propeller blade de-icer assemblies (boots) in accordance with the accomplishment instructions of Dowty Propellers Service Bulletin (SB) F50-61-158 dated 30 September 2005 or a later EASA-approved revision.

3. When, during the inspection in accordance with requirement 2 of this AD, any signs of lifting or bubbling are found, replace the affected de-icer boot in accordance with Dowty Propellers Specification PS 5723 (attached to Dowty SB F50-61-158 as Appendix 1), latest revision.