EASA AD No.: 2015-0198

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EASA AIRWORTHINESS DIRECTIVE

AD No.: 2015-0198

Date: 30 September 2015

Note: This Airworthiness Directive (AD) is issued by EASA, acting in accordance with Regulation 

(EC) No 216/2008 on behalf of the European Community, its Member States and of the 

European third countries that participate in the activities of EASA under Article 66 of that 

Regulation.

This AD is issued in accordance with EU 748/2012, Part 21.A.3B. In accordance with EU 1321/2014 Annex I, Part M.A.301, the 

continuing airworthiness of an aircraft shall be ensured by accomplishing any applicable ADs. Consequently, no person may operate an 

aircraft to which an AD applies, except in accordance with the requirements of that AD, unless otherwise specified by the Agency

[EU 1321/2014 Annex I, Part M.A.303] or agreed with the Authority of the State of Registry [EC 216/2008, Article 14(4) exemption].

Design Approval Holder’s Name:

AIRBUS HELICOPTERS DEUTSCHLAND GmbH

Type/Model designation(s):

MBB-BK 117 D-2 helicopters

TCDS Number: EASA.R.010

Foreign AD: Not applicable

Supersedure: None

ATA 71 Power Plant – Engine Mount Bushings – Inspection

Manufacturer(s): Airbus Helicopters Deutschland GmbH (AHD), formerly Eurocopter 

Deutschland GmbH.

Applicability: MBB-BK 117 D-2 helicopters, all serial numbers.

Reason: During a pre-flight check of an MBB-BK 117 D-2 helicopter, an engine mount 

bushing of one engine was found delaminated. During additional investigation, 

further cases of delaminated engine mount bushings were detected.

This condition, if not detected and corrected, may lead to cracks and,

eventually, failure of the engine mount front support pins, possibly resulting in 

loss of control of the helicopter.

To address this potential unsafe condition, AHD issued Alert Service Bulletin 

(ASB) MBB-BK117 D-2-71A-002 to provide instructions to inspect the engine 

mounts bushing.

For the reasons described above, this AD requires accomplishment of repetitive 

inspections of the engine mounts bushings and, depending on findings, the 

accomplishment of applicable corrective action(s).

Effective Date: 14 October 2015
EASA AD No.: 2015-0198

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Required Action(s) 

and Compliance

Time(s):

Required as indicated, unless accomplished previously:

(1) Within 50 flight hours (FH) after the effective date of this AD, and,

thereafter, at intervals not to exceed 50 FH (see Note 1 of this AD), inspect 

the bushings of the inner and outer forward trusses of both engines, in 

accordance with the instructions of paragraph 3.B.2 of AHD ASB 

MBB-BK117 D-2-71A-002.

Note 1: A non-cumulative tolerance of 10 FH may be applied to the compliance 

times specified in paragraph (1) of this AD to allow synchronization of the 

required inspections with other maintenance tasks for which a noncumulative 

tolerance is already granted in the applicable Maintenance Manual.

(2) If, during any inspection as required by paragraph (1) of this AD, any 

defective bushing is found, before next flight, accomplish the applicable 

corrective action(s) in accordance with the instructions of section 3.B.2 of 

AHD ASB MBB-BK117 D-2-71A-002.

(3) Corrective action(s) accomplished on a helicopter, as required by 

paragraph (2) of this AD, do not constitute terminating action for the 

repetitive inspections as required by paragraph (1) of this AD for that 

helicopter.

Ref. Publications: AHD ASB MBB-BK117 D-2-71A-002 original issue, dated 28 September 2015.

The use of later approved revisions of this document is acceptable for 

compliance with the requirements of this AD.

Remarks: 1. If requested and appropriately substantiated, EASA can approve 

Alternative Methods of Compliance for this AD.

2. Based on the required actions and the compliance time, EASA have 

decided to issue a Final AD with Request for Comments, postponing the 

public consultation process until after publication.

3. Enquiries regarding this AD should be referred to the Safety Information 

Section, Certification Directorate, EASA. E-mail: ADs@easa.europa.eu.

4. For any question concerning the technical content of the requirements in 

this AD, please contact:

Airbus Helicopters Deutschland GmbH, Industriestrasse 4, 

86609 Donauwörth, Germany 

Telephone: + 49 (0)151 1422 8976; Facsimile: + 49 (0)906 71 4111