Document ID: chunk:federal_register_of_legislation:F2005L02841:body:0:p1
Version: federal_register_of_legislation:F2005L02841
Segment Type: other
Provision Reference: 
Character Range: 0–2990

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 39.001(1) of CASR 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 aircraft or 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.

Fokker F100 (F28 Mk 100) Series Aeroplanes
AD/F100/71  Main Landing Gear Bay Fuel/Hydraulic Lines  11/2005

Applicability:  Fokker Aircraft B.V. Model F28 Mark 0070 and Mark 0100 aeroplanes.
Requirement:       1. Inspect the clearance between the fuel lines and hydraulic lines in the left hand (LH) and right hand (RH) main landing gear (MLG) Bays in accordance with Section 3 of the accomplishment instructions, Part 1, of Fokker Service Bulletin (SB) F100-28-041 dated 20 July 2005 or later CAA-NL approved revision and when clearances between the affected lines are found of 3 mm (0.118 inch) or more in both MLG Bays, no further action is required and the aircraft may be returned to service.

                     (a) When a clearance between the affected lines is found of less than 3 mm (0.118 inch) and there are chafing marks on the fuel lines, replace the affected fuel line and modify or readjust, as applicable, the attachment of the affected fuel lines and hydraulic lines in accordance with Section 3 Accomplishment Instructions, Part 2, of Fokker SB F100-28-041 or later CAA-NL approved revision.

                     (b) When a clearance between the affected lines is found of less than 3 mm (0.118 inch) and there are no chafing marks on the fuel lines, modify or readjust, as applicable, the attachment of the affected fuel lines and hydraulic lines in accordance with Section 3 Accomplishment Instructions, Part 2, of Fokker SB F100-28-041 or later CAA-NL approved revision.

                Note:  CAA-NL AD NL-2005-010R1 EASA approval No. 2005-6232 dated
                7 September 2005 refers.
Compliance:        1. Within the next 6 months after the effective date of this directive.

                     (a) Before further flight.

                     (b) Within the next 6 months after the inspection as required by Requirement 1(a) of this Directive.
                This Airworthiness Directive becomes effective on 27 October 2005.

Background:  During regular operations with a Fokker 100 (F28 Mark 0100), a fuel leak was found in the LH MLG Bay.  The subsequent investigation revealed that a fuel line was chafed through, caused by interference with a hydraulic line.  During manufacturing of the aircraft, a minimum distance of three (3) mm (0.118 inch) was maintained