Commonwealth legislation

AD/MU-2/65 - Engine Torque Indication System

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

4/10 complexity

This mandatory Airworthiness Directive orders operators of Mitsubishi MU-2B-25/26/35/36 aeroplanes to inspect engine torquemeters and torque transducers per Mitsubishi Service Bulletin No. 233, repair or replace any units out of limits, and perform a ground engine check.

Inspections are due within 100 flight hours after 10 March 1999; aircraft must be fixed before next flight if defects are found. The rule prevents undetected engine power mismatches that can degrade control and safety.

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/MU-2/65 - Engine Torque Indication System.

For MU-2B-25, -26, -35 and -36 aeroplane

For MU-2B-25, -26, -35 and -36 aeroplanes:

Inspect the torquemeter in accordance with MHI SB No 233 dated 7 October 1998.

2. If, during the Requirement 1 inspection, the errors in the torque indication system are found to exceed the allowable limit specified in the SB, repair or replace the torquemeter in accordance with the SB.

3. Inspect the torque transducer in accordance with the SB.

4. If, during the Requirement 3 inspection, the torque transducer output voltage is found to exceed the allowable limit specified in the SB, adjust the torque transducer output voltage in accordance with the SB.

5. Accomplish a ground check of the engines in accordance with the SB.

Note: JCAB AD TCD-4889-98 refers.

Source text

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

For MU-2B-25, -26, -35 and -36 aeroplane For MU-2B-25, -26, -35 and -36 aeroplanes:

For MU-2B-25, -26, -35 and -36 aeroplanes:

Inspect the torquemeter in accordance with MHI SB No 233 dated 7 October 1998.

2. If, during the Requirement 1 inspection, the errors in the torque indication system are found to exceed the allowable limit specified in the SB, repair or replace the torquemeter in accordance with the SB.

3. Inspect the torque transducer in accordance with the SB.

4. If, during the Requirement 3 inspection, the torque transducer output voltage is found to exceed the allowable limit specified in the SB, adjust the torque transducer output voltage in accordance with the SB.

5. Accomplish a ground check of the engines in accordance with the SB.

Note: JCAB AD TCD-4889-98 refers.

For MU-2B-25, -26, -35 and -36 aeroplane For MU-2B-25, -26, -35 and -36 aeroplanes:

For MU-2B-25, -26, -35 and -36 aeroplanes:

Within 100 hours time in service after the effective date of this Directive.

2. Before further flight after the Requirement 1 inspection.

3. Within 100 hours time in service after the effective date of this Directive.

4. Before further flight after the Requirement 2 inspection.

5. Within 100 hours time in service after the effective date of this Directive. This Airworthiness Directive becomes effective on 10 March 1999.

Background: MHI reports that some torque transmitter or transducers have been found significantly out of calibration. This can result in an actual power mismatch that is not indicated on the engine instruments. Mismatched power and resulting trim may result in degraded performance or handling qualities.

This Directive requires the inspection and, if necessary, the repair, replacement or calibration of the torque indication system.