COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Robinson R22 Series Helicopters
AD/R22/47 Fuel Tank Vent System 13/98 DM
R22 helicopters S/Nos. 0002 through 1451 except aircraft overhauled by Robinson after January 1991.
Inspect, and modify if required, the fuel tank vent system in accordance with Robinson R22 Service Bulletin No. 84.
FAA Priority Letter AD 98-21-09 also refers.
Robinson Service Bulletin No. 83 also addresses fuel tank vent system modification.
Within 25 hours time in service, or 30 days, from the effective date of this Directive, whichever occurs first.
This Airworthiness Directive becomes effective on 14 October 1998
This directive is prompted by reports of uncommanded loss of engine power on R22 helicopters. The power loss events have been attributed to kinking of the fuel tank vent system.