Commonwealth legislation

AD/BELL 206/114 - Fuel System Flow Switches

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This Act has been repealed and is no longer in force. It is retained for historical reference.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

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What this directive does This safety order requires owners and operators of specific Bell 206 helicopters to inspect or replace faulty fuel system flow switches according to manufacturer instructions.

Who it affects Anyone operating Bell 206L or 206L-1 helicopters with serial numbers 45001-45153, 46601-46617, or 45154-45790.

What you must do Follow the manufacturer's instructions in Bell Alert Service Bulletin 206L-88-52. You must complete this work by whichever comes first:

Your next scheduled maintenance inspection (when the aircraft gets its Maintenance Release — basically its fitness certificate to fly), or
30 November 1988

Why it matters Old-style fuel switches can get clogged with fuel contamination. When blocked, they fail to trigger the "L/FUEL PUMP" and "R/FUEL PUMP" warning lights on the dashboard. Without these warnings, pilots won't know if fuel isn't flowing properly, which can cause the engine to cut out mid-flight (engine flameout).

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Current sections

Direct links to the current provisions in AD/BELL 206/114 - Fuel System Flow Switches.

AD/BELL 206/114 - Fuel System Flow Switches

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Bell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters

AD/BELL 206/114 Fuel System Flow Switches 9/88

Applicability: All model 206L S/N 45001 through 45153 and 46601 through 46617. All model 206L-1 S/N 45154 through 45790.

Requirement: Action in accordance with Bell Alert Service Bulletin 206L-88- 52. Compliance: Unless already accomplished, at the next inspection for issue of a Maintenance

Release or by 30 November 1988, whichever occurs first.

Background: A number of accidents and incidents have been caused by the old style fuel flow switches being blocked by fuel system contaminants. If blockage of the flow switch occurs the L/FUEL PUMP and R/FUEL PUMP caution lights will fail to illuminate. Fuel contaminants can also block the manifold and dual ejector pump nozzle causing the fuel transfer system to become inoperative. Failure by the pilot to detect these blockages can result in an engine flameout.

Source text

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

1 AD/BELL 206/114 - Fuel System Flow Switches