Landing Gear – Hydraulic Line Restrictor Check Valve – Replacement
Superseded. Comply with 2024-0123, which replaces this document.
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Fokker F28 Mark 0070 and Mark 0100 aeroplanes with affected hydraulic restrictor check valves must replace these valves with the improved versions within 24 months from 20 April 2018. Maintenance teams must also ensure that no affected parts are installed on any aircraft after modification or from the effective date for aircraft without affected parts. Compliance should follow the instructions in Fokker Services Service Bulletin SBF100-32-163 Revision 1.
Summary
EASA Airworthiness Directive 2018-0077 is an airworthiness directive issued by the European Union Aviation Safety Agency affecting Fokker Services B.V. F28 aeroplanes, specifically the F28 Mark 0070 and Mark 0100 models. It addresses issues with hydraulic line restrictor check valves in the parking brake shut-off valve (PBSOV) hydraulic return line that may become obstructed by debris. The directive mandates replacement of these valves with improved versions incorporating a filter screen to ensure safe landing gear operation.
What changed
This directive introduces a mandatory replacement of the hydraulic line restrictor check valves, part numbers D71293-003, D71295-401, and D71296-401, with improved valves featuring a filter screen, part numbers CKLX0517200B or CRKLX0520100B. It supersedes previous inspections and modifications by requiring installation of the improved valve to prevent partial obstruction issues identified in service. The directive also prohibits installation of the affected parts on any aeroplane after modification or from the effective date for unaffected aircraft.
Why it matters
This directive is critical for aviation professionals because debris obstructing the restrictor check valve can prevent full extension of the main landing gear, posing a significant safety risk during landing. Operators and maintenance organizations must ensure compliance to avoid potential damage to the aircraft and injury to occupants. Compliance ensures continued airworthiness and adherence to European aviation safety regulations.
More for Fokker F28
All 36- EASA PAD 26-019Time Limits / Maintenance Checks — Airworthiness Limitations Section Part 2 —Airworthiness Limitations Items and Safe life Items — AmendmentFeb 2, 2026
- EASA AD 2025-0250Fuselage — Frame Inboard Boom — InspectionNov 10, 2025
- EASA AD 2024-0192Landing Gear — Main Landing Gear Piston — InspectionOct 10, 2024
- EASA AD 2024-0176Landing Gear – Main Landing Gear Piston – InspectionSep 11, 2024
- EASA AD 2024-0123Landing Gear — Hydraulic Line Restrictor Check Valve — Replacement
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