COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Boeing 737 Series Aeroplanes
AD/B737/30
Amdt 2
Engine Throttle Cable 1/92
Applicability: Model 737-300, -400 and -500 series, listed in Boeing SB 737-76-1023.
Requirement: Action in accordance with the technical requirement of FAA AD 91-21-13 Amdt 39- 8060.
Note: Boeing SB 737-76-1023 refers.
Compliance: As specified in the requirement document with a revised effective date of 12 January 1992 for Australian registered aircraft.
Background: Interference between the number two engine throttle cable and the adjacent right wing front spar bracket near station 124, has resulted in one throttle cable failure and a significant number of worn or frayed cables. This AD introduced an increased frequency inspection period until planned modification action by the manufacturer was available.
Amendment 1 was raised to include the 400 series aeroplane which was the subject of a new country of origin AD.
Amendment 2 to this Directive requires terminating action in lieu of repetitive inspections of the cable. The manufacturer has developed a modification which will eliminate the cable’s accelerated wear condition, and a condition referred to as “engine throttle cable ratcheting” which exists on each engine. The effective date required by the FAA is extended by approximately one month.