COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 767 Series Aeroplanes AD/B767/37 Brake Metering Valve Module Shaft 7/90 Applicability: Model 767 series aeroplanes with line positions 1-131, 133-135, 137-147, 149, 155- 157, and 159-161. Requirement: Unless already accomplished replace aluminium brake metering valve module with steel shafts in accordance with Boeing Service Bulletin 767-32-0081. Note: FAA AD 89-26-01 Amdt 39-6416 refers. Compliance: Within 750 landings after 12 July 1990 or prior to the accumulation of 15,000 landings, whichever occurs later. Background: Fractures of brace metering valve module aluminium shafts have occurred on model 757 series aeroplanes. The model 767 has similar shafts, and incorporation of steel shafts will prevent a potential loss of braking.