Commonwealth legislation

AD/BEECH 90/76 Amdt 2 - Elevator Trim Tab System

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This AD requires operators of Beechcraft 90 and 65‑90 (King Air) aircraft to inspect and modify the elevator trim tab system using Beech Service Bulletin 2028 Rev IV and an FAA interim flight‑manual check. The measure addresses trim‑cable disengagement and frozen cable drums that can immobilise the trim and raise elevator control forces. The AD sets staggered deadlines for inspections, modifications and recurring pre‑flight checks, so operators meet specified work and record‑keeping obligations and bear the cost of inspections and fittings.

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AD/BEECH 90/76 Amdt 2 - Elevator Trim Tab System

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Beechcraft 90 and 65-90 (King Air) Series Aeroplanes

AD/BEECH 90/76

Amdt 2

Elevator Trim Tab System 13/88

Applicability: All models listed in the Requirement Document.

Requirement: a. Action in accordance with Beech SB 2028 R IV Parts I, II, III, IV, V, VI, VII, VIII as applicable.

b. Verify the operation of the elevator trim system in accordance with the Interim Addendum to the FAA approved Flight Manual and Pilots Operating Handbook, (attached to the Requirement Document).

c. Action in accordance with Beech SB 2028 R IV Parts IV, V, VI as applicable.

Note: FAA AD’s 86-20-03 and 87-04-24 refer.

Compliance: a. Part I - Within 25 hours’ time in service after 20 November 1986.

Part II - At the next scheduled inspection for Maintenance Release after 20 November 1986.

Part III, IV, V, VI - as applicable prior to 15 May 1987.

Part VIII - At the next scheduled inspection for Maintenance Release after 30 January 1989.

b. Prior to each flight after compliance with Part I or Part II until modified.

Note: This inspection may be accomplished by the pilot in command, in which case the precise A.D. reference shall be entered in a certification made on the Maintenance Release coincident with the Daily Inspection.

c. Aircraft modified to Part III of SB 2028 R II; prior to 24 March 1987.

Background: The manufacturer reports cases of disengagement of the elevator trim cable from the cable drum. This has inhibited movement of the trim tab and increased elevator control forces excessively, thereby resulting in an unsafe condition. Amendment 1 references R III of the Requirement Document. R III requires additional modification to prevent water in the cable drum from freezing and immobilizing the trim system. The compliance period for modification is extended. Those aircraft already modified to Part III require additional work due to an unsafe condition. Amendment 2 references Rev IV of the Requirement Document which adds Part VIII, requiring additional work on trim actuator.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/BEECH 90/76 Amdt 2 - Elevator Trim Tab System