AD/MU-2/42 - Autopilot/Electric Trim Switch Standardisation (Cth)

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

Mitsubishi MU-2 Series Aeroplanes

AD/MU-2/42 Autopilot/Electric Trim Switch Standardisation 13/89

Applicability: All model MU 2 equipped with any manual electric trim system and/or any autopilot other than Bendix.

Requirement: 1. Modify the control yoke in the affected model airplanes as follows:

1. For MU 2B-35 model aircraft equipped with a King KFC 300 automatic flight control system (AFCS) and a Sperry manual/electric pitch trim system, in accordance with Bendix/King Certification Bulletin No. CB10, KPN 006-0712- 00.

b. For MU 2B-36 model aircraft equipped with a Sperry SPZ-200 AFCS and a MAI manual/electric pitch trim system, in accordance with MHI Kit - Sperry SPZ-200AP Disengagement Drawing, 035A-985006.

2. Configuration check. Visually verify that: 1. The autopilot disconnect and trim disconnect/interrupt functions are combined on one button mounted on the outboard control wheel grip, and is so oriented that it is easily activated by the pilot/copilot.

b. The autopilot disconnect and trim disconnect/interrupt button is properly and legibly labelled to indicate functions.

c. The button is red in colour.

d. There are no other red buttons nearby that could be mistaken for the autopilot disconnect.

e. The autopilot circuit breaker is properly labelled.

3. Pitch Trim Disconnect/Interrupt Functional Check.

With the manual electric pitch trim system armed, press the trim button to cause the manual pitch trim wheel to rotate. Verify that when each of the following operations is performed, the manual pitch trim wheel stops moving: