AD/ENST 28/39 - Main Rotor Blade Retention Pin (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.

Enstrom F-28 Series Helicopters AD/ENST 28/39 Main Rotor Blade Retention Pin 10/2007 DM

Applicability: Model F-28, F-28A, F-28C, F-28C-2, F-28C-2R, F-28F, F-28F-R, 280, 280C, 280F, 280FX, TH-28, 480, and 480B helicopters, with a main rotor blade retention pin having a serial number that is listed below:

04098-01 through 04098-56 05018-01 through 05018-36 05143-01 through 05143-56 05341-1 through 05341-8 05341-10 through 05341-17 05341-19 05341-21 through 05341-33 05341-35 through 05341-42 05341-44 through 05341-59 05341-61 05341-62 05341-64 through 05341-71 06214-3 through 06214-14 06214-16 through 06214-23 06214-25 through 06214-29 06214-31 06214-33 through 06214-35 06214-37 through 06214-57 06214-59 through 06214-68 Requirement: 1. Check the serial number that is marked on the head of each main rotor blade retention pin (retention pin) and check if the number is listed in the Applicability section of this Directive. See Figure 1 for the location of the serial number. If there is no serial number marked on the head of the retention pin (ie. The retention pin head is blank), the retention pin does not need to be replaced and this determination constitutes a terminating action for the requirements of this Directive for that retention pin.