Airworthiness directives › 2013-12-06
AD 2013-12-06 Airworthiness Directives; Eurocopter Deutschland (Eurocopter) Helicopters
Applicability*9
This AD becomes effective July 24, 2013.
Compliance
Special flight permits are prohibited.
Required actions
(1) The Manager, Rotorcraft Certification Office, FAA, may approve AMOCs for this AD. Send your proposal to: Martin Crane, Aviation Safety Engineer, Rotorcraft Certification Office, Rotorcraft Directorate, FAA, 2601 Meacham Blvd., Fort Worth, Texas 76137; telephone (817) 222-5056; email 7-AVS-ASW-170@faa.gov. (2) For operations conducted under a 14 CFR part 119 operating certificate or under 14 CFR part 91, subpart K, we suggest that you notify your principal inspector, or lacking a principal inspector, the manager of the local flight standards district office or certificate holding district office, before operating any aircraft complying with this AD through an AMOC.
Unsafe condition
(1) Before further flight, and thereafter at intervals not exceeding 10 hours time-in-service (TIS), inspect the lockwire securing the pulley mount bolts for proper installation and the pulley for looseness. If the lockwire is damaged or broken, or is not installed in a tightening direction, or if the pulley is loose, remove and inspect the pulley as described in paragraphs (e)(2)(i) and (e)(2)(ii) of this AD. (2) Within 25 hours TIS: (i) Remove the pulley from the rotor brake disc and, using a 10X or higher power magnifying glass, inspect the bolts and mounting holes glass for damage or distortion. If there is any damage or distortion, replace the pulley. (ii) Install the pulley and torque each mount bolt to 90 inch-pounds. After torqueing, determine whether a gap exists among each bolt head, washer, and the mating surface of the rotor brake disc. If there is a gap, replace the pulley. (iii) Lock wire each pulley mount bolt to its adjacent rotor brake mounting bolt with 0.6 millimeter lockwire.
Affected ADs
This AD defines the unsafe condition as loosening of an air conditioning drive pulley (pulley) mount bolt, which could result in separation of the pulley from the rotor brake disc on the tail rotor (T/R) driveshaft, damage to the T/R driveshaft, and subsequent loss of control of the helicopter.
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