EASA AD No : 2008-0206 

EASA Form 110 Page 1/2 

EASA AIRWORTHINESS DIRECTIVE 

AD No.: 2008-0206 

Date: 25 November 2008 

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 : Germany No.3025, United Kingdom No. FR.3, EASA.R.010 

Foreign AD : Not applicable 

Supersedure : None 

ATA 64 Tail Rotor – Balance Weights & Control Lever – Inspection / 

Replacement 

Manufacturer(s): Eurocopter Deutschland GmbH; Eurocopter Hubschrauber GmbH; 

Messerschmitt-Bölkow-Blohm GmbH 

Applicability: 

Models BO 105 A, BO 105 C, BO 105 LS A-1, BO 105 D, BO 105 DS, BO 105 

DB, BO 105 DBS, BO 105 DB-4, BO 105 DBS-4, BO 105 DBS-5 and 

BO 105 S helicopters, all serial numbers, and 

Models 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: 

During a periodical inspection, corrosion was detected on the tail rotor balance 

weights in the area of the attachment thread. This condition, if not detected 

and corrected, could lead to failure of the threads, possibly resulting in 

separation of tail rotor parts, subsequent severe tail rotor vibration and 

consequent loss of control of the helicopter. 

For the reasons described above, this new EASA AD requires repetitive visual 

inspections of the tail rotor balance weights and control levers to identify any 

damage and the replacement of damaged components. 

Effective Date: 09 December 2008 
EASA AD No : 2008-0206 

EASA Form 110 Page 2/2 

Required Action(s) 

and Compliance 

Time(s): 

Required as indicated, unless accomplished previously: 

(1) Within the next 2 months or 100 flight hours (FH), whichever occurs first 

after the effective date of this AD, and thereafter at intervals not to exceed 

600 FH (+ 60 FH) or 48 months (+ 6 months), whichever occurs first, 

inspect the tail rotor balance weights and control levers in accordance with 

the instructions of Eurocopter Deutschland (ECD) BO105 Alert Service 

Bulletin (ASB) No. ASB BO105-30-116 or ECD BK117 ASB No. ASBMBB-BK117-30-113, as applicable to helicopter type. 

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

is detected which exceeds the acceptable limits as specified in the ASB, 

before next flight, replace the affected components with serviceable parts. 

(3) Replacement of parts does not constitute terminating action for the 

repetitive inspection requirements of this AD. 

Ref. Publications: 

Eurocopter Deutschland GmbH BO105 ASB No. ASB BO105-30-116 and 

BK117 ASB No. ASB-MBB-BK117-30-113, both dated 23 September 2008. 

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. This AD was posted on 09 October 2008 as PAD 08-115 for consultation 

until 30 October 2008. The Comment Response Document can be found 

at http://ad.easa.europa.eu. 

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, P.O. Box 80 11 40, 81663 München, 

Federal Republic of Germany 

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