AD/EMB-110/44 Amdt 3 - Elevator Trim Actuator Support (Cth)

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

Embraer EMB-110 (Bandeirante) Series Aeroplanes

AD/EMB-110/44 Amdt 3

Elevator Trim Actuator Support 5/93

Applicability: Model EMB-110 series aircraft.

Requirement: 1. Action IAW the Technical Requirements of Brazilian AD T91-07-02.

The trim actuator shall be removed to facilitate this inspection.

2. Install a P/N 110-3210-25 actuator support fitting.

Note 1: Cracks have also been found in the elevator spar adjacent to the mounting attachment holes, and in the lugs of the elevator trim tab support bracket.

Note 2: CTA AD 93-02-01 and Embraer ASB 110-027-A090 refer.

Compliance: 1. Within 300 hours time in service after the last compliance with the previous issue of this Directive, and thereafter at intervals not to exceed 300 hours time in service; until compliance with Requirement 2.

2. Unless already accomplished, within 1200 hours TIS after 29 April 1993.

Background: As the result of an in-flight flutter incident in Australia, checks were instituted and a number of aircraft were found to have significant damage. In-flight failure could lead to loss of the aircraft. Amendment 1 was issued to reflect the requirements of the Country of Origin AD which had been issued in response to cracking around the actuator support. Amendment 2 was issued following a review of the calendar time compliance requirement. Calendar time was not considered to be relevant to crack growth in this instance, and the Directive is therefore amended. Amendment 3 is issued in response to a new Brazil CTA AD which requires installation of an improved support fitting and thereby constitutes terminating action of the ongoing repetitive inspections.