AD 2013-19500
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Eurocopter | Deutschland GmbH | Airworthiness Directives; Eurocopter Deutschland GmbH Helicopters |
Unsafe Condition
An improperly manufactured bypass inlet in the oil filter area 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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Required Actions
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. Machine the main transmission housing upper part in accordance with Annex A of ZF Luftfahrttechnik GmbH Service Instruction No. EC135FS108-1659-1009. Do not install a main transmission upper part, P/N 4649 301 034, unless it has been modified as required.
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Compliance Time
Within 3 months for installing the corrugated washer; within 4,000 hours time-in-service or at the next main transmission repair or overhaul, whichever occurs first, for machining the housing upper part.
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Affected Aircraft
Eurocopter Deutschland GmbH Model EC135 P1, P2, P2+, T1, T2, and T2+ helicopters with a main transmission FS108 housing upper part, part number (P/N) 4649 301 034 and a serial number listed in Table 1 of Eurocopter Alert Service Bulletin EC135-63A-017, Revision 0, dated October 11, 2010.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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