Document ID: chunk:federal_register_of_legislation:F2005L03888:body:0:p1
Version: federal_register_of_legislation:F2005L03888
Segment Type: other
Provision Reference: 
Character Range: 0–3297

AIRWORTHINESS DIRECTIVE
On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/HU 369/113 and issues the following 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.

McDonnell Douglas (Hughes) and Kawasaki 369 Series Helicopters
AD/HU 369/113 Amdt 1  Main Rotor Blade Torque  1/2006 DM
                      Events and Life Limit

Applicability:  Models 369D, 369E, 369F, 369FF, 500N, or 600N helicopters with either an MD Helicopter Inc. (MDHI) main rotor blade installed or modified with Helicopter Technology Company, LLC (HTC), Supplemental Type Certificate (STC) No. SR09172RC, SR09074RC, or SR01050LA with an HTC blade installed, as listed below:
                Model     MDHI blade part No. (P/N)          HTC blade P/N         HTC STC
                369D      369D21100 Basic, -516, -517, -523  500P2100-BSC, -BSC-1  SR09172RC
                369E      369D21120-501, -503                500P2100-101, -103    SR09074RC
                369F, FF  369D21102 Basic, -503, -517, -523  500P2300-501, -503    SR01050LA
                          369D21121-501, -503
                500N      369D21102-503, -517, -523          500P2300-501, -503    SR01050LA
                          369D21121-501, -503
                600N      369D21102-517, -523                500P2300-501, -503    SR01050LA
                          369D21121-501, -503

                Note:  The terms "BSC" and "Basic" are interchangeable when identifying blades produced by MDHI and HTC.
Requirement:       1. Determine and record the number of torque events accumulated on each blade.  A torque event (TE) is the transition to a hover from forward flight or any external lift operation.  Each transition to a hover from forward flight is recorded as a TE, and any external lift operation is recorded as two TEs.  Forward flight is considered to be flight at any airspeed (or direction) after attaining translational lift.  If you cannot determine the number of TEs, use 13,720 TEs.

                   Continue to record the number of TEs accumulated (actual usage) throughout the life of the blades along with hours time in service.  On or before accumulating an additional 200 TEs or at the end of each day's operations, whichever occurs first, record and update the accumulated TEs total.

                2. For each blade that has accumulated 13,720 or more TEs and 750 or more hours time in service, before further flight, unless already accomplished; and thereafter after at intervals not to exceed 200 TEs or 35 hours time in service, whichever occurs first, perform a main rotor blade torque event inspection.

                If a crack is found, before further flight, replace the affected blade with a serviceable blade.