Airworthiness directives › 2014-06-51
AD 2014-06-51 Airworthiness Directives; Airbus Helicopters Deutschland GmbH (Airbus Helicopters) (Type Certificate Previously Held by Eurocopter Deutschland GmbH) Helicopters
Applicability*9
This AD becomes effective July 30, 2014 to all persons except those persons to whom it was made immediately effective by Emergency AD 2014-06-51, issued on March 24, 2014, which contains the requirements of this AD.
Compliance
Within 5 hours time-in-service, inspect each pulley attaching bolt hole to determine the depth: (1) Relieve tension from the compressor drive belt and remove each bolt that attaches the pulley to the rotor brake disc. Do not remove all three bolts at the same time. (2) Remove AN960-416 washer or MAI-145-DUAL LOCK TAB washer. (3) Using a bolt or screw with 1/4 -28 threads with 0.5 inch of threads and a minimum of 0.8 inch grip length, coat the shank with blue dye or permanent marker and thread into hole until threads have lightly bottomed (finger tight). Scribe the shank flush with the face of the rotor brake disk. Measure distance from end to scribe mark (length protruding into assembly). This dimension represents total depth of threads and stack-up of the brake disk. (4) If the depth measures less than 0.61 inch, remove the pulley. (5) If the depth measures 0.61 inch or more, install dual locking tabs as described in the Accomplishment Instructions, paragraphs 3.E. through 3.G., of Metro Aviation, Inc., Alert Service Bulletin No. MA145-21B-003, Revision B, dated December 20, 2013.
Required actions
Within 10 days after inspecting the pulley as required by paragraph (f)(3) of this AD, submit a report with the helicopter model, helicopter serial number, hole number 1 thread depth, hole number 2 thread depth (if measured), and hole number 3 thread depth (if measured) to the person identified in paragraph (h)(1) of this AD.
Unsafe condition
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
Affected ADs
This AD defines the unsafe condition as insufficient thread depth which could allow the attaching bolts to come loose, resulting in the pulley detaching from the rotor brake disc, subsequent damage to the tail rotor (T/R) driveshaft, and loss of control of the helicopter.
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