Commonwealth legislation

AD/SF340/21 - Auto-Coarsening

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Commonwealth

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legislative instrument

Plain English Summary

3/10 complexity

This directive requires owners/operators of SAAB SF340 aeroplanes S/N 004–159 to remove certain previously installed ECU modifications and install a modified ECU per FAA AD 90-21-16 (Amdt 39‑6763), cancelling the earlier AD/SF340/13. Compliance is required by 30 April 1991.

It matters because the prior modifications may harm single‑engine climb performance; owners/operators bear retrofit costs, downtime and must follow the FAA technical instructions.

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AD/SF340/21 - Auto-Coarsening

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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 SAAB SF340 Series Aeroplanes

AD/SF340/21 Auto-Coarsening 2/91 DM

Applicability: All SAAB SF340 Series aircraft S/No 004 through 159 inclusive.

Requirement: Action in accordance with the technical requirements of FAA AD 90-21-16 Amdt 39- 6763.

Note 1: This directive cancels AD/SF340/13.

Note 2: Swedish AD No 1-037 refers and cancels Swedish AD No 1-028.

Compliance: Prior to 30 April 1991

Background: As previously incorporated Electrical Control Unit (ECU) modifications may affect single engine climb performance. The FAA, Swedish Airworthiness Authority and the Aircraft Manufacturer requires these modifications to be removed and a modified ECU to be installed.

Source text

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