Commonwealth legislation

AD/DHC-8/10 - Uncommanded Engine Power Roll Back

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This airworthiness directive requires an electrical continuity check so the MAX/RDC PWR switch cannot mistakenly feed 28 VDC to the Engine Electronic Fuel Control. It applies to DHC‑8 Series aeroplanes Serial Nos 3–134 that have not had de Havilland modification 8/0886 and aims to prevent uncommanded engine power rollback traced to a miswired 28 VDC connection during manufacture.

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Current sections

Direct links to the current provisions in AD/DHC-8/10 - Uncommanded Engine Power Roll Back.

AD/DHC-8/10 - Uncommanded Engine Power Roll Back

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes

AD/DHC-8/10 Uncommanded Engine Power Roll Back 13/89

Applicability: All DHC 8 Series aircraft Serial No’s 3 through 134 not incorporating de Havilland modification 8/0886.

Requirement: To eliminate the potential for uncommanded engine power roll back following inadvertent selection of the MAX/RDC PWR switch, perform an electrical continuity check to ensure that the MAX/RDC PWR switch cannot incorrectly connect 28 VDC power to the Engine Electronic Fuel Control.

Note: Canadian AD CF-89-13 and DHC SB 8-73-10 refer.

Background: One instance of uncommanded engine power roll back has been reported following inadvertent crew selection of the MAX/RDC PWR switch. Investigation determined that the roll back resulted from 28 VDC being incorrectly fed to the Engine Electronic Control unit when the MAX/RDC PWR switch was inadvertently selected. The cause was traced to a 28 VDC wire which had mistakenly been connected to the MAX/RDC PWR switch during manufacture.

Source text

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

1 AD/DHC-8/10 - Uncommanded Engine Power Roll Back

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Bombardier (Boeing Canada/De Havilland) DHC-8 Series Aeroplanes

AD/DHC-8/10 Uncommanded Engine Power Roll Back 13/89

Applicability: All DHC 8 Series aircraft Serial No’s 3 through 134 not incorporating de Havilland modification 8/0886.

Note: Canadian AD CF-89-13 and DHC SB 8-73-10 refer.