1AD/BEECH 99/4 - Vertical Stabiliser Main Spar

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Beechcraft 99 Series Aeroplanes

AD/BEECH 99/4 Vertical Stabiliser Main Spar 6/95

Applicability: Beech 99, 99A, A99A and B99 aircraft, serial numbers U-1 to U-151.

Requirement: Visually inspect, using a borescope, both flanges of the vertical stabiliser main spar and angle doubler as specified in Beech Service instruction (SI) 0530-134.

Note: FAA AD 90-15-18 refers.

Compliance: Initially inspect before 2000 hours’ time in service or before 50 hours’ time in service after 25 May 1995, whichever occurs last.

Re-inspect at intervals not to exceed 500 hours’ time in service.

Installation of a doubler over uncracked structure in accordance with Beech SI 0530- 134, Fig 3; or stabiliser replacement with P/N 115-640000-605, -607 or -651 cancels the Requirement of this Directive.

Background: Cracking has been experienced in the vertical stabiliser main spar.