82-15-07: Tail Rotor Drive Shaft

82-15-07 ROBINSON HELICOPTER COMPANY: Amendment 39-4419. Applies to Model R-22 series helicopters certificated in all categories, serial numbers 0002 through 0282. Compliance is required as indicated, unless already accomplished. To prevent loss of power to the tail rotor, accomplish the following: Within 100 hours' additional time in service after the effective date of this AD, remove from further service the following tail rotor drive shaft components in accordance with Robinson Helicopter Company Service Bulletin No. 21 dated June 1, 1982, or FAA approved equivalent: T/R Driveshaft Assembly A197-* thru Rev. P, Damper Assembly A041-1 thru Rev. H, Plate, Flex Coupling A193-3, Spacer A559-1 thru Rev. F, Spacer A559-2. Replace with: T/R Driveshaft Assembly A197-* Rev. Q and subsequent, Damper Assembly A041-1 Rev. I and subsequent, Plate, Flex Coupling A947-3, Spacer A559-1 Rev. G and subsequent. *The dash number of the replacementA197 shaft must be the same as the one removed to obtain the correct length. Special flight permits may be issued in accordance with Sections 21.197 and 21.199 of the Federal Aviation Regulations to operate rotorcraft to a base for the accomplishment of modification required by this AD. Alternate inspections, modifications, or other actions which provide an equivalent level of safety may be used when approved by the Chief, Western Aircraft Certification Field Office, FAA, Northwest Mountain Region. This amendment becomes effective July 26, 1982.