Commonwealth legislation

AD/ALF/6 - Replacement of Fuel By-Pass Valve In Dual Heat Exchanger

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

3/10 complexity

This AD requires removal or rework of dual heat exchanger P/N 2-303-491-01 on AlliedSignal (Lycoming) ALF 502R engines within 100 flights of 4 June 1987 or by 31 July 1987. Affected aircraft owners/operators must pay and choose removal or rework per Lycoming Service Bulletin ALF 502R-79-0151 Rev 1; the measure is intended to prevent engine fuel‑system icing when fuel temperature at takeoff exceeds 10°C.

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/ALF/6 - Replacement of Fuel By-Pass Valve In Dual Heat Exchanger.

AD/ALF/6 - Replacement of Fuel By-Pass Valve In Dual Heat Exchanger

meta-content-style-type: text/css meta-content-type: application/xhtml+xml; charset=utf-8 meta-generator: Aspose.Words for .NET 22.10.0

?xml version="1.0" encoding="utf-8" standalone="no"?>

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source AlliedSignal (Lycoming) Turbine Engines - ALF502 and LF507 Series

AD/ALF/6 Replacement of Fuel By-Pass Valve In Dual Heat Exchanger

6/87

Applicability: ALF 502R series which have dual heat exchanger P/N 2-303-491-01 installed.

Requirement: Remove from service or rework dual heat exchangers P/N 2-303-491-01 in accordance with Lycoming SB ALF 502R-79-0151 Rev 1.

Compliance: Unless already accomplished within 100 flights after 4 June 1987 but not later than 31 July 1987.

Background: This Directive is issued requiring the installation of a new fuel by-pass valve which will prevent engine fuel system icing when fuel load temperature at take-off is above 10º C.

Source text

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