Commonwealth legislation

AD/F27/149 - Fuel Differential Pressure Switches

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Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

2/10 complexity

Requires operators of Fokker F27 Mk100–Mk700 aeroplanes to inspect fuel differential pressure switches and attached pressure sensing lines and to reinstall any incorrect installations in accordance with Fokker Service Bulletin F27/28‑63. (Applicability; Requirement; Compliance.) The inspection must occur within one calendar month and corrections made before further flight. (Compliance.) Operators pay for the inspections and repairs; the CASA delegate issued the directive. The action addresses the risk that an upside‑down switch can cross‑connect lines and disable the fuel‑filter icing warning, risking engine flame‑out. (Background.)

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AD/F27/149 - Fuel Differential Pressure Switches

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

View image in the official source
View image in the official source
Fokker F27 Series Aeroplanes

AIRWORTHINESS DIRECTIVE

View image in the official source

View image in the official source
For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

AD/F27/149	Fuel Differential Pressure Switches	3/2000TX
Applicability:	Model F27 Mk 100 through Mk 700 series aeroplanes, all serial numbers.

Requirement: 1. Inspect the installed fuel differential pressure switches and attaching fuel pressure sensing lines for proper installation in accordance with Fokker Service Bulletin (SB) F27/28-63 dated November 21, 1999.

Re-install, in accordance with Fokker SB F27/28-63 dated November 21,1999, any fuel differential pressure switches and/or fuel pressure sensing lines found incorrectly installed during the above inspection.

Note: RLD AD (BLA) 1999-154 dated November 30, 1999 refers.

Compliance: 1. Within one calendar month after the effective date of this directive.

Before further flight.

This Airworthiness Directive becomes effective on 2 February 2000.

Background: Recent instances have occurred where the fuel differential switch was installed upside down which can result in inadvertent cross-connection of the fuel pressure sensing lines inhibiting the function of the fuel filter icing warning system. This could leave an ice-blocked fuel filter undetected, leading to fuel starvation and engine flame-out.

Signature of Eugene Paul Holzapfel, Delegate of the Civil Aviation Safety Authority.

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safety Authority 29 January 2000

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The above AD is notified in the Commonwealth of Australia Gazette on 2 February 2000.

Source text

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

1 AD/F27/149 - Fuel Differential Pressure Switches

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

Fokker F27 Series Aeroplanes

AIRWORTHINESS DIRECTIVE

For the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.

AD/F27/149	Fuel Differential Pressure Switches	3/2000TX
Applicability:	Model F27 Mk 100 through Mk 700 series aeroplanes, all serial numbers.

Re-install, in accordance with Fokker SB F27/28-63 dated November 21,1999, any fuel differential pressure switches and/or fuel pressure sensing lines found incorrectly installed during the above inspection.

Note: RLD AD (BLA) 1999-154 dated November 30, 1999 refers.

Compliance: 1. Within one calendar month after the effective date of this directive.

Before further flight.

This Airworthiness Directive becomes effective on 2 February 2000.

Eugene Paul Holzapfel

Delegate of the Civil Aviation Safety Authority 29 January 2000