Commonwealth legislation

AD/LEARJET 35/16 - Maximum Operating Airspeed (VMO) - Reduction and Terminating Modification

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

Mechanically: lowers the maximum operating airspeed (VMO) to 307 KIAS by installing airspeed‑warning placards and modifying the mach/overspeed switch, and requires replacing or re‑aging both forward engine mounts per Gates Learjet AMK 80‑6. Affects Learjet 35 and 36 aircraft with the listed serial numbers. The stated purpose is to prevent overload failures of the forward engine mount after overspeed events; operators must comply within specified flight‑hour windows, incurring maintenance and parts costs.

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AD/LEARJET 35/16 - Maximum Operating Airspeed (VMO) - Reduction and Terminating Modification

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source Gates Learjet 35 and 36 Series Aeroplanes

AD/LEARJET 35/16 Maximum Operating Airspeed

(VMO) - Reduction and Terminating Modification

Applicability: All model 35 series with S/Nos. 35-050 to 35-339 except 35-054 and 35-065.

All model 36 series with S/Nos. 36-017 and 36-045.

11/80

Requirement: To prevent the encountering of a possible overload flight condition that could fail the forward engine mount, accomplish the following:

Install airspeed warning placards and modify the mach/overspeed switch circuit to effect a reduced maximum operating airspeed (VMO) of 307 KIAS, from sea level to 31,100 feet altitude.

2. Replace or re-age both forward engine mounts in accordance with Gates Learjet Corporation Airplane Modification Kit AMK 80-6.

Note: FAA AD 80-17-11, Amdt. 39-3888 refers.

Compliance: Para. 1 - Within 75 hours time in service after 8 October 1980. Reduction in VMO to remain until modified in accordance with Para. 2 requirement.

Para. 2 - Within 600 hours time in service after 8 October 1980.

Background: Exceeding the maximum operating airspeed is suspected as a causal factor in recent overseas accidents involving the subject model aeroplanes.

Source text

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