Commonwealth legislation

AD/EMB-110/51 - Generator Control Unit Overvoltage Protection Circuit

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legislative instrument

Plain English Summary

3/10 complexity

Mandates an initial and recurring functional test of both generator control unit (GCU) overvoltage protection circuits on all Embraer EMB‑110 aircraft, and requires replacement of any GCU that fails the test before further flight. Applies to aircraft owners/operators and maintenance organisations, directs tests to follow Embraer Service Bulletin SB 110‑24‑0037, and aims to detect malfunctions that can damage electrical/electronic systems or cause loss of generated power; owners bear test and replacement costs and may face aircraft downtime.

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AD/EMB-110/51 - Generator Control Unit Overvoltage Protection Circuit

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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-110 (Bandeirante) Series Aeroplanes

AD/EMB-110/51 Generator Control Unit Overvoltage

Protection Circuit

Applicability: This Directive is applicable to all EMB-110 Bandeirante aircraft.

3/96 DM

Requirement: 1. Perform a functional test of both generator control unit (GCU) overvoltage protection circuits in accordance with Embraer Service Bulletin SB 110-24-0037 dated 6 November 1995.

Replace the GCU with a serviceable unit.

Note: CTA (Brazil) AD 95-11-02R1 Amdt 39-754 refers.

Compliance: For Requirement 1 - Within 200 hours time in service or two calendar months, whichever occurs first, after 17 January 1996 and thereafter at intervals not exceeding 600 hours time in service.

For Requirement 2 - Before further flight, if the GCU fails the Requirement 1 functional test.

Background: Embraer has advised of instances concerning malfunction of voltage control and GCU overvoltage protection circuits. The reported malfunctions may cause damage to the electrical and electronic systems of the aircraft, including complete loss of generated power. Actions specified by this Directive are designed to provide early detection of malfunctioning circuitry.

Source text

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