Commonwealth legislation

AD/BELL 412/19 - Emergency DC Bus Number One Feeder Circuit

RepealedCTH

This Act has been repealed and is no longer in force. It is retained for historical reference.

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

This Airworthiness Directive mandates owners/operators of Bell 412 and 412NB helicopters (S/N 33108–33139 and 33150–33154) to inspect/repair a wiring defect that can cause a short in essential bus No.2 and trip both emergency circuit breakers, cutting all emergency power. Compliance must follow Bell ASB 412-87-33 and be done within 100 flight hours after 24 Mar 1988 or at the next scheduled inspection, whichever is later.

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Current sections

Direct links to the current provisions in AD/BELL 412/19 - Emergency DC Bus Number One Feeder Circuit.

AD/BELL 412/19 - Emergency DC Bus Number One Feeder 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 Bell Helicopter Textron 412 Series Helicopters

AD/BELL 412/19 Emergency DC Bus Number One Feeder Circuit 3/88

Applicability: All model Bell 412 and 412NB helicopters S/No 33108 to 33139 inclusive, and 33150 to 33154 inclusive.

Requirement: Action in accordance with Bell ASB 412-87-33 dated 1 December 1987.

Compliance: Within 100 hours time in service after 24 March 1988, or at the next scheduled inspection for Maintenance Release issue after 24 March 1988 whichever is the latter.

Background: Bell have advised that Model 412 emergency and essential buses are configured such that a short circuit on essential bus number 2 will cause both emergency bus 50 amp feeder circuit breakers to open thus removing all power from the emergency bus.

Source text

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