Airworthiness directives › 2018-07-01
AD 2018-07-01 Airworthiness Directives; Airbus Helicopters Deutschland GmbH (Type Certificate Previously Held by Eurocopter Deutschland GmbH)
Applicability*9
This AD replaces AD 2013-16-14, Amendment 39-17552 (78 FR 54383, September 4, 2013).
Compliance
(1) Within 3 months, remove the oil filter element and install a corrugated washer, P/N 0630100377, in the middle of the filter housing of the housing upper part as depicted in Figure 2 of ASB EC135-63A-017. (2) Within 5,150 hours time-in-service or at the next main transmission repair or overhaul, whichever occurs first, machine the main transmission housing upper part in accordance with Annex A of ZF Luftfahrttechnik GmbH Service Instruction No. EC135FS108-1659-1009, dated September 14, 2010. (3) Do not install a main transmission upper part, P/N 4649 301 034, 4649 301 067, or 4649 301 088, on any helicopter unless it has been modified as required by paragraphs (f)(1) through (f)(2) of this AD.
Required actions
Actions accomplished before the effective date of this AD in accordance with the procedures specified in Eurocopter Alert Service Bulletin EC135-63A-017, Revision 0, dated October 11, 2010, are considered acceptable for compliance with the corresponding actions specified in paragraph (f) 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 an improperly manufactured bypass inlet in the oil filter area. This condition could adversely affect the oil-filter bypass function, resulting in failure of the main transmission and subsequent loss of control of the helicopter.
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