Document ID: chunk:federal_register_of_legislation:F2007L04222:body:0:p1
Version: federal_register_of_legislation:F2007L04222
Segment Type: other
Provision Reference: 
Character Range: 0–2987

AIRWORTHINESS DIRECTIVE
On the effective date specified below, and for the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/F50/88 and issues the following 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 F50 (F27 Mk 50) Series Aeroplanes
AD/F50/88 Amdt 1  Power Plant - Feathering pump  13/2007 TX

Applicability:  Model F.27 Mk.50, 0502 and 0604 aeroplanes all serial numbers, unless the engines that are installed have previously been modified in accordance with Fokker Service Bulletin (SB) SBF50-61-024 Revision 1 dated 4 July 2007.
Requirement:       1. Visually inspect both engines externally in two specific areas for any indication of oil leakage in accordance with the instructions detailed in Fokker Services All Operator Message AOF50.037 (ref TS04.57535) dated 2 November 2004.

                   The pilot may carry out Requirement 1 of this AD provided the pilot has completed an approved training program.

                Note 1:  Fokker Services All Operator Message AOF50.037 includes graphics to show the specific areas that need to be inspected.

                   2. If any indication of oil leakage is found during the inspection as detailed in Requirement 1 of this AD, perform a detailed inspection for oil leakage at the feathering pump of the affected engine in accordance with Part 1 of the Accomplishment Instructions of Fokker Services SB F50-61-023 Revision 1 dated 4 July 2007 or later NAA approved revision.

                   3. Perform a detailed inspection for oil leakage at the feathering pump on both engines in accordance with Part 1 of the Accomplishment Instructions of Fokker Services SB F50-61-023 Revision 1 dated 4 July 2007 or later NAA approved revision.

                   4. If during the inspection as detailed in Requirement 2 or 3 of this AD, oil leakage is found at the feathering pump mounting pad of an engine, replace bobbin part number (P/N) 638005614 with bobbin P/N 638005637 and install a gasket on the feathering pump of that engine in accordance with the Accomplishment Instructions of Fokker Services SB F50-61-025 dated 4 July 2007 or later NAA approved revision.

                   5. Replace bobbin P/N 638005614 with bobbin P/N 638005637 and install a gasket on the feathering pump of that engine in accordance with the Accomplishment Instructions of Fokker Services SB F50-61-025 or later NAA approved revision.

                6. The replacement of a modified