AD 2018-07-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Eurocopter Deutschland GmbH | Various | Airworthiness Directives; Airbus Helicopters Deutschland GmbH (Type Certificate Previously Held by Eurocopter Deutschland GmbH) |
| aircraft | Airbus | Helicopters Deutschland GmbH has extended the overhaul interval for the main transmission and determined that other models may have the same unsafe condition | Airworthiness Directives; Airbus Helicopters Deutschland GmbH (Type Certificate Previously Held by Eurocopter Deutschland GmbH) |
Unsafe Condition
an improperly manufactured bypass inlet in the oil filter area, which could adversely affect the oil-filter bypass function, resulting in failure of the main transmission
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
installing a corrugated washer in the upper part filter housing and modifying each affected upper part by machining the oil filter bypass inlet
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 5,150 hours TIS
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Model EC135 P1, P2, P2+, P3, T1, T2, T2+, and T3 helicopters with a main transmission FS108 housing upper part, part number (P/N) 4649 301 034, 4649 301 067, or 4649 301 088 and a serial number listed in Table 1 of Airbus Helicopters Alert Service Bulletin EC135-63A-017, Revision 2, dated December 5, 2016
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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