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AD/S-PUMA/79 - Main Rotor - Main Rotor Head
Eurocopter AS 332 (Super Puma) Series HeEurocopter AS 332 (Super Puma) Series Helicopters
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Eurocopter AS 332 (Super Puma) Series Helicopters
| AD/S-PUMA/79 | Main Rotor - Main Rotor Head | 11/2008 DM |
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| Applicability: | Eurocopter AS 332 C, AS 332 C1, AS 332 L and AS 332 L1 helicopters, if a main rotor head (MRH) Part Number (P/N) 332A31-0001-05 or P/N 332A31-0001-06 is installed, having serial number (s/n) M172, M216, M261, M308, M547, M677, M811 or M936, and having logged less than 275 flight hours since its last overhaul or repair.Note: The additional s/n MRH units identified in Eurocopter Alert service Bulletin (ASB) AS 332 N° 62.00.73 have already been checked as required by this AD. |
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| Requirement: | Action in accordance with the technical requirements of EASA AD 2008-0172-E.Note: Eurocopter Alert service bulletin AS 332 ASB 62.00.73 or later approved document refers. |
| Compliance: | As specified in the requirement document with an amended effective date of 10 September 2008. |
| This Airworthiness Directive becomes effective on 10 September 2008. | |
| Background: | Eurocopter has recently received a report of deterioration of the swash-plate assembly upper bearing on a MRH, installed on an AS 332 L1 helicopter, after having logged only 72 flight hours since last overhaul. The occurrence report states an onset of vibrations which compelled the pilot to land as soon as practicable. These vibrations were found to be due to premature deterioration of the upper bearing of the swash-plates. The degradation of this bearing generates a load increase on the scissors links. This condition, if not corrected, could lead to the failure of the scissors links and consequently loss of control of the helicopter. |
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David Villiers
Delegate of the Civil Aviation Safety Authority
10 September 2008