AD 2019-12-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Finmeccanica S.p.A. | AW139 | Airworthiness Directives; Leonardo S.p.A. Helicopters |
Unsafe Condition
A crack in the tail rotor driveshaft, which could result in failure of the tail rotor drive system and subsequent loss of control of the helicopter.
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Required Actions
Inspect the number 1 driveshaft tube shaft, P/N 3G6510A00832, for a scratch and indentation in the area depicted in Figure 1 of Leonardo Helicopters Bollettino Tecnico No. 139-465, Revision A, dated January 25, 2017. If there is a scratch or indentation, repair the tube shaft in accordance with the Compliance Instructions, Part I, paragraphs 7.1 through 7.3, of BT 139-465. Measure the depth of the repaired areas as depicted in Figure 2 of BT 139-465. If the depth exceeds 0.5 mm, replace the driveshaft tube and alter the rear exhaust module and tunnel assembly before further flight. If the depth is less than or equal to 0.5 mm, perform an eddy current inspection of the tube for a crack. If there is a crack, replace the driveshaft tube and alter the rear exhaust module and tunnel assembly before further flight. If no crack is found, alter the rear exhaust module and tunnel assembly, if not previously done as a result of the inspections, and re-identify the tunnel assembly P/N after it is altered, which would be terminating action for the repetitive inspections.
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Compliance Time
Within 30 hours time-in-service (TIS) and thereafter at intervals not to exceed 100 hours TIS
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Affected Aircraft
Model AW139 helicopters, serial numbers 31499, 31504, 31507, 31509, 31512, 31518, 31519, 31524, 31529, 31533, 31535 through 31564, 31567, 31569, 31570, 31589, 41363, 41368 through 41370, 41372 through 41375, 41378, 41381, and 41384, with a tunnel assembly part number (P/N) 3G7130A13431 installed
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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