Document ID: chunk:federal_register_of_legislation:F2007L01597:body:0:p2
Version: federal_register_of_legislation:F2007L01597
Segment Type: other
Provision Reference: 
Character Range: 2705–4410

Within 30 days after the effective date of this AD, unless previously accomplished.

                2. After compliance with paragraph 1 of this directive:

                  a. At intervals not to exceed 7 days.

                  b. At intervals not to exceed 28 days.

                3. Before further flight after the effective date of this AD.

                4. Before further flight after the effective date of this AD.

                5. Before further flight after the effective date of this AD.
             This Airworthiness Directive becomes effective on 5 July 2007.
Background:  In-service experience revealed that, due to their position on the aircraft, ice may form on actuators P/N 9409122 installed on fuel crossfeed valves and fuel fire shut-off valves.  Tests revealed that the ice can prevent the actuator and thus the valve from operating in flight (frozen stuck).  A new actuator is being developed by Fokker Services; However, an airworthiness assessment revealed that interim actions are required for actuators P/N 9409122 installed on fuel crossfeed valves and fuel fire shut-off valves until the new actuators are installed.  Fokker Services has issued SB SBF100-28-049 to introduce interim actions that will reduce the probability that fuel crossfeed and fuel fire shut-off valves equipped with actuators P/N 9409122 do not operate due to ice.  The interim actions consist of an operational check of the actuators and the application of a grease layer on the actuators, followed by a weekly visual check of the applied grease layer and a 4-weekly operational check of the actuators.

Charles Lenarcic
Delegate of the Civil Aviation Safety Authority

14 May 2007