European Aviation Safety Agency

Emergency AD - ATA 62 – Main Rotor – Blades – Inspection / Replacement
 N AD 2016-0237-E

Annotation

Reason:

Some operators experienced delamination or disbonding of the abrasion strip on main rotor (M/R) blades Part Number (P/N) 369D21120-505, which resulted in loss of the abrasion strip in-flight. At least one event occurred on a low time M/R blade having only 4,5 flight hours (FH).

This condition, if not detected and corrected, could lead to significant vibration, possibly resulting in loss of control of the helicopter.

To address this potential unsafe condition, the M/R blade manufacturer, Helicopter Technology Company, LLC, issued Mandatory Service Bulletin 2100-8, Revision 3 (R3), and Mecaer Aviation Group S.p.a. (MAG) issued Alert Mandatory Service Bulletin (SB) BN-500-127.

For reasons described above, this AD requires repetitive inspections of the affected M/R blade abrasion strips and, depending on findings, replacement. This AD also requires replacement of the affected blades with modified blades, having a stainless steel abrasion strip installed, which is terminating action for the repetitive inspections.

Автоматический перевод:

Чрезвычайный AD - ATA 62 – главный ротор – лезвия – проверка / замена

Причина:

Некоторые операторы испытали расслаивание или disbonding полосы трения на главном роторе (M/R) Номер детали лезвий (P/N) 369D21120-505, который привел к потере полосы трения, в полете. По крайней мере одно событие имело место на низком времени лезвие M/R, имеющее только 4,5 летных часа (FH).