Airworthiness Directive · Amendment 39-17725 · Air conditioning system
Eurocopter Deutschland GmbH Helicopters
This AD applies to Eurocopter Deutschland GmbH (Eurocopter) Model EC135P2+ and EC135T2+ helicopters, serial numbers 870, 872, 873, 879, 883, 884, 888, 893, 900, 905, 911, 914, 916, 917, 923, and 926, with a mechanical air conditioning system compressor bearing block upper bearing (upper bearing) part number L210M1872105 installed, certificated in any category.
We are adopting a new airworthiness directive (AD) for certain Eurocopter Deutschland GmbH (Eurocopter) Model EC135P2+ and EC135T2+ helicopters. This AD requires inspecting the mechanical air conditioning system compressor bearing block upper bearing (upper bearing) for corrosion, leaking grease, condensation, or water. This AD was prompted by metallic debris from an upper bearing found in the air inlet areas of both engines in a Model EC135P2+ helicopter. The actions of this AD are intended to prevent metallic debris from damaging the engine, causing loss of engine power, and subsequent loss of helicopter control.
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.
Within 25 hours time-in-service (TIS):
(1) Visually inspect the upper bearing for corrosion, leaking grease, condensation, or water.
(2) If there is condensation but no corrosion, leaking grease, or water, repeat this inspection at intervals not to exceed 25 hours TIS.
(3) If there is no corrosion, leaking grease, condensation, or water, repeat this inspection at intervals not to exceed 100 hours TIS.
(4) If there is corrosion, leaking grease, or water, deactivate the air conditioning system in accordance with the Accomplishment Instructions, Section 3.B.3, Paragraphs (a) through (ai) of Eurocopter Emergency Alert Service Bulletin No. EC135-21A-013, Revision 0, dated June 6, 2011.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
