§ Air Retract Mechanism (Optional)
Viper Jet MKII Composite
27
Connect Remaining Air Lines and
Test Retract Operation
Required Parts
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Fuselage [F]
Required Tools and Adhesives
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Hex Wrench
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Air Line Cutting Tool
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Note: you will complete these steps after the
wing has been joined to the fuselage. This will
allow you to connect the air lines for the main
gear and test the retract motion.
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Trim the nose wheel air line to length and
attach it to the t-fitting feeding the retractable
gear units. This is the air line closest to the edge
of the actuator valve (on the side opposite the
servo, using blue air line in the images).
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After attaching the wings connect the main gear
air lines to the remaining connections on the t-
fitting feeding the retractable gear units.
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Test the operation of the retractable landing
gear. You should be able to get 12-20 full
actuations from a full tank. You should also be
able to get at least 2 hours of holding time from
a full tank. If you don’t get both, check the
system for leaks.
Check for leaks using smoke in a bottle or dry
powder. Do not use water or soap on the valves
as they have oil in them and their operation will
be compromised.
Retractable gear test, extended
Retractable gear test, retracted
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In case of air system failure the SAPAC
retractable landing gear will automatically
deploy as they are the air-up and spring-down
type.