EASA AD No : 2010-0049 

EASA Form 110 Page 1/2 

EASA AIRWORTHINESS DIRECTIVE 

AD No.: 2010-0049 

[Corrected: 24 March 2010] 

Date: 19 March 2010 

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 EC 1702/2003, Part 21A.3B. In accordance with EC 2042/2003 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 

[EC 2042/2003 Annex I, Part M.A.303] or agreed with the Authority of the State of Registry [EC 216/2008, Article 14(4) exemption]. 

Type Approval Holder’s Name : 

Eurocopter Deutschland GmbH 

Type/Model designation(s) : 

BO 105 and MBB-BK 117 helicopters 

TCDS Numbers : EASA.R.010, EASA.R.011 

Foreign AD : Not applicable 

Supersedure : This AD supersedes EASA AD 2009-0079 dated 01 April 2009. 

ATA 67 Rotors Flight Control – Cyclic-Stick Locking Device – Modification 

Manufacturer(s): 

Eurocopter Deutschland GmbH, Eurocopter Hubschrauber GmbH, 

Messerschmitt-Bölkow-Blohm GmbH, Messerschmitt-Bölkow-Blohm Helicopter 

Canada Limited, Eurocopter Canada Limited. 

Applicability: 

BO 105 A, BO 105 C, BO 105 D, BO 105 LS A-1, BO 105 LS A-3 and 

BO 105 S helicopters, all variants, all serial numbers, and 

MBB-BK 117 A-1, MBB-BK 117 A-3, MBB-BK 117 A-4, MBB-BK 117 B-1, 

MBB-BK 117 B-2 and MBB-BK 117 C-1 helicopters, all serial numbers. 

Reason: 

There have been several cases reported where take-off was executed with a 

locked cyclic stick on EC135 series helicopters. EASA AD 2008-0113 was 

issued to address and correct this problem. The Stick Locking Device as 

installed on BO 105 and MBB-BK 117 rotorcraft types has a similar function. 

Trying to take off with a locked cyclic stick may lead to loss of control of the 

helicopter. 

Although no recent reports of take-off with a locked cyclic stick have been 

received concerning BO 105 or MBB-BK 117 helicopters, to prevent such 

occurrences, Eurocopter Deutschland (ECD) has developed a modification of 

the cyclic stick cantilever. After modification, locking of the cyclic stick is no 

longer possible. The cyclic stick can only be centred in its neutral position. 

For the reasons described above, EASA AD 2009-0079 was issued to require 

modification of the cyclic stick locking/centering device and the amendment of 

the applicable Rotorcraft Flight Manual (FLM). 

Since that AD was issued, the Model BO 105 LS A-3, which until recently was 

a Canadian type design owned by Eurocopter Canada, has been transferred to 

the ownership of Eurocopter Deutschland. Concurrently, the State of Design 
EASA AD No : 2010-0049 

EASA Form 110 Page 2/2 

responsibilities for the continued airworthiness of these helicopters was 

transferred to EASA. 

The unsafe condition addressed by EASA AD 2009-0079 also affects BO 105 

LS A-3 helicopters, but no corresponding AD had been issued by Transport 

Canada prior to the type transfer taking place in June 2009. 

Consequently, this new EASA AD retains the requirements of AD 2009-0079, 

which is superseded, and adds the BO 105 LS A-3 helicopters to the 

Applicability. 

This AD has been republished to correct the Applicability, making this 

consistent with the certified Models as specified in the TCDS EASA.R.011. 

Effective Date: 02 April 2010 

Required Action(s) 

and Compliance 

Time(s): 

Required as indicated, unless accomplished previously: 

Re-statement of the requirement of AD 2009-0079, applicable to all 

helicopters affected by this new AD, except the model BO 105 LS A-3: 

(1) Within 6 months after 15 April 2009 [the effective date of AD 2009-0079], 

modify the cyclic stick locking/centering device by removing the spring 

from the cyclic stick lock in accordance with the instructions of ECD Alert 

Service Bulletin (ASB) ASB-MBB-BK117-40-113 or ASB BO105-40-106, 

as applicable to the helicopter type. 

New requirement of this AD, only for model BO 105 LS A-3 helicopters: 

(2) Within 6 months after the effective date of this AD, modify the cyclic stick 

locking/centering device by removing the spring from the cyclic stick lock 

in accordance with the instructions of Eurocopter Canada Limited ASB 

BO105 LS 40-10. 

Applicable to all helicopters: 

(3) Concurrent with the modification as required by paragraph (1) or (2) of this 

AD, as applicable to helicopter type and model, amend the FLM by 

inserting the following note: 

 NOTE: Move cyclic stick in its neutral position before the engines are 

started. The neutral position and the centering of the cyclic stick can be 

achieved by folding down the holder assy. Locking of the cyclic stick is no 

longer possible. 

 This may be accomplished by inserting a copy of this AD into the FLM, or 

by FLM page(s) supplied by ECD. 

Ref. Publications: 

Eurocopter Deutschland ASB-MBB-BK117-40-113 dated 22 December 2008. 

Eurocopter Deutschland ASB BO105-40-106 dated 19 December 2008. 

Eurocopter Canada Limited ASB-BO 105 LS 40-10 dated 08 May 2009. 

The use of later approved revisions of these documents 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. The required actions and the risk allowance have granted the issuance of 

a Final AD with Request for Comments, postponing the public consultation 

process after publication. 

3. Enquiries regarding this AD should be referred to the Airworthiness 

Directives, Safety Management & Research 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 Eurocopter Deutschland GmbH, Industriestrasse 

4, 86607 Donauwörth, Federal Republic of Germany. 

Telephone: + 49 (0) 151 14 22 89 76, Facsimile: + 49 (0) 906 71-4111.