COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Twin Commander (Gulfstream/Rockwell/ Aerocommander 500, 600 and 700) Series Aeroplanes
AD/AC/70 Engine Oil Breather Line - Modification 8/79
Applicability: Models 680F, 680F(P), 680FL and 680FL(P) modified per STCs SA2691WE or SA2891WE (Lycoming IO-720 conversion).
Document: Mr. R.P.M. Inc. SB No. 004.
Compliance: Within 100 hours’ time in service after 31 August 1979.
Background: The manufacturer has found it necessary to provide an alternative oil breather line outlet in the event that the primary vent becomes blocked by ice in flight.