Mon, Feb 22, 2010
AD No.: 2010-0026-E
ATA 62 Main Rotor Head - Rotor Hub
Inspection
Applicability:
Eurocopter helicopter models EC 120 B all serial numbers, if
equipped with Main Rotor Head with the following Hub part numbers:
C622A1002103, C622A1002104, C622A1002105
Reason:
Eurocopter has been informed that
an EC 120 B helicopter has performed an emergency landing due to a
set of amplitude vibrations originating from the main rotor.
As a result of the investigation, it was determined that the
Main Rotor Head (MRH) hub had failed in the attachment area of one
of the three drag damper fittings.
Due to the reasons described above, this Emergency AD requires a
repetitive visual inspection for detecting eventual cracks to
preclude any risk of MRH hub failure.
Effective Date: 21 February 2010
Required Action(s) and Compliance: Required as
indicated, unless already accomplished:
Time(s):
- Within the next 15 flight hours after the effective date of
this AD and thereafter, at intervals not exceeding 15 flight hours,
perform a visual inspection to detect cracks in the inspection
areas of the rotor hub in accordance with the instructions of
paragraph 2.B.2 of Emergency Alert Service Bulletin Eurocopter EC
120 05A012 - Revision 1 - (EASB).
- If no crack is found, re-install the dome fairing if it was
removed previously and resume flight in accordance with the
instructions of § 2.B.2, of Eurocopter EASB.
- If one or more cracks are found, before next flight, contact
Eurocopter as described in the NOTE 1 of paragraph 2.A of
Eurocopter EASB, and replace the affected rotor hub with a new
rotor hub in accordance with § 2.B.2 of Eurocopter EASB.
- If during inspection accomplished in accordance with § (1)
of this AD local deterioration is found, remove the finish paint
until the P05 primer coat become visible and visually inspect the
concerned areas in accordance with § 2.B.2.b.3. Accomplish the
relevant corrective actions in accordance with § 2.B.2.b.1 or
§ 2.B.2.b.2.
- Replacement of the rotor hub in compliance with § (3) or
§ (4) of this AD does not terminate the repetitive inspection
requirements of § (1) of this AD.
Ref. Publications:
Eurocopter EC 120 B EASB 05A012 – Revision 1, dated 19
February 2010.
The use of later approved revisions of this document is acceptable
for compliance with the requirements of this AD.
Remarks:
- If requested and appropriately substantiated, EASA can approve
Alternative Methods of Compliance for this AD.
- The safety assessment has requested not to implement the full
consultation process and an immediate publication and
notification.
- Enquiries regarding this AD should be referred to the
Airworthiness Directives, Safety Management & Research Section,
Certification Directorate, EASA; E-mail: ADs@easa.europa.eu
.
- For any question concerning the technical content of the
requirements in this AD, please contact:
EUROCOPTER (STDI), Aéroport de Marseille Provence,
13725 Marignane Cedex, France
Telephone: +33 (0) 4 42 85 97 97 - Fax +33 (0) 4 42 85 99 66
E-mail:Directive.technical-support@eurocopter.com:
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