Commonwealth legislation

AD/EMB-120/1 - Generator Control Unit (GCU)

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Commonwealth

Collection

legislative instrument

Plain English Summary

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This directive requires owners/operators of specified Embraer EMB‑120 airframes (S/No 120004 and 120006–120090) to carry out the technical corrective actions set out in Brazilian AD 90‑09‑03 (with Embraer SB 120‑024‑0021 Rev 3 as guidance) to address Generator Control Unit failures.

Compliance must occur within 1,000 flight hours after 30 September 1990; the measure mitigates momentary overvoltages from GCU failures that could damage critical systems, shifting direct costs and scheduling impacts to the affected operators.

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AD/EMB-120/1 - Generator Control Unit (GCU)

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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 Embraer EMB-120 (Brasilia) Series Aeroplanes

AD/EMB-120/1 Generator Control Unit (GCU) 2/91

Applicability: Embraer 120 aircraft S/No’s 120004; and 120006 through to 120090 inclusive. Requirement: Action in accordance with the technical requirements of Brazilian AD 90-09-03.

Note: Embraer SB 120-024-0021 Revision 3 also refers.

Compliance: Within 1000 hours time in service after 30 September 1990.

Background: Advice has been received that GCU failures may result in momentary overvoltages of sufficient amplitude to cause failure of critical aircraft systems and components.

Source text

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