AD/LEARJET/24 - Automatic Flight Controls Systems - Inspection and Modification (Cth)

Federal Register of Legislation

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

Gates Learjet 24 & 25 Series Aeroplanes

AD/LEARJET/24 Automatic Flight Controls Systems - Inspection and Modification

Applicability: All models 24 with S/Nos. 24-218 and subsequent;

All models 25 with S/Nos. 25-003 to 25-061; 25-067 to 25-201, 25-204 and subsequent;

All Models 28 with S/Nos. 28-001 and subsequent; All Models 29 with S/Nos. 29-001 and subsequent.

8/80 Requirement: Conduct the following inspections to assure capability of manually overriding the Automatic Flight Control Systems:

1. Energize the aircraft electrical system by applying 28 VDC electrical power.

2. Roll Axis On aircraft equipped with FC-110 autopilot, remove the electrical power from the FC-110 Autopilot Computer. Open the computer and identify the Roll Calibration Board. On the Roll Calibration Board, temporarily install, in parallel with R18 (82 ohm) resistor, a 39 ohm, one watt resistor. Restore the electrical power and engage the Autopilot with the control wheel centered and veify that the roll slip clutch breakaway occurs by rotating the control wheel briskly (45 degrees per second) in both directions. If slippage is not verified, remove the capstan and adjust to proper torque per the appropriate Gates Learjet Service Manual. Return Autopilot Computer to original configuration and accomplish a functional check of the autopilot.

3. Yaw Axis Effective on all Models; Check and adjust the yaw capstan slip clutch torque (primary and secondary where applicable) in accordance with the appropriate Gates Learjet Service Manual.

4. Pitch Axis

(a) Effective on Models 24D, 24D-A, 24E, 24F, 24F-A, 25B, 25C, 25D, 25F, 28 or 29 aircraft and aircraft incorporating Gates Learjet Kits AAK71-12 or AMK80-3 (torquers):

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Document text

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

Gates Learjet 24 & 25 Series Aeroplanes

AD/LEARJET/24 Automatic Flight Controls Systems - Inspection and Modification

Applicability: All models 24 with S/Nos. 24-218 and subsequent;

All models 25 with S/Nos. 25-003 to 25-061; 25-067 to 25-201, 25-204 and subsequent;

All Models 28 with S/Nos. 28-001 and subsequent; All Models 29 with S/Nos. 29-001 and subsequent.

8/80 Requirement: Conduct the following inspections to assure capability of manually overriding the Automatic Flight Control Systems:

1. Energize the aircraft electrical system by applying 28 VDC electrical power.

3. Yaw Axis Effective on all Models; Check and adjust the yaw capstan slip clutch torque (primary and secondary where applicable) in accordance with the appropriate Gates Learjet Service Manual.

4. Pitch Axis

(a) Effective on Models 24D, 24D-A, 24E, 24F, 24F-A, 25B, 25C, 25D, 25F, 28 or 29 aircraft and aircraft incorporating Gates Learjet Kits AAK71-12 or AMK80-3 (torquers):

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