73-12-02 DOWTY ROTOL: Amdt. 39-1653. Applies to Dowty Rotol Propellers, type (c)R186/4-30-4/16 which have not been modified in accordance with Modification No. (c) VP.2388 (Rev. 3). These propellers are installed on, but not necessarily limited to, Armstrong Whitworth Argosy Type A.W. 650 Series 101 airplanes.
Compliance is required as indicated.
To prevent cracking of the propeller hub front wall, accomplish the following:
Within the next 200 hours' time in service after the effective date of this AD, or prior to the accumulation of 8,000 hours total time in service, whichever occurs later, strengthen the propeller hub and hub driving center by incorporating Modification No. (c) VP.2388, Revision 3, in accordance with Dowty Rotol Service Bulletin No. 61-604 (Rev. 2) dated November 24, 1971, or an FAA-approved equivalent.
This amendment becomes effective July 1, 1973.