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The following instructions will show you the installation of
the optional Robart retractable landing gear.
Hangar 9 offers two types of optional of Robart retractable
landing gear for the B-25 Mitchell.
HANB25 Includes the following parts:
• Robart tricycle retracts • Robostruts*
• Retract valve • Air Tubing
• Filler valve • “T” fittings
• Quick disconnects • Air Tank
*The Robostruts are factory cut to the correct length.
HANB25S Includes the following parts:
• Robart tricycle retracts • Robostruts*
*The Robostruts are factory cut to the correct length.
In addition, you are required to supply:
• ROB164G Robart air pump to fill the air tank
Hardware needed to complete optional
installation of Robart retracts
• 4-40 x 1-inch socket head bolts (12)
• 4-40 blind nuts (12)
• #4 washers (12)
• #10 washers for axle spacers (6)
• Material to fabricate the mount for the retract valve.
• 2-56 ball end (2)
Nose Gear Installation
Step 1
Drill two 1/8-inch (3mm) holes in the rear bulkhead in the
nose gear wheel well to accept the air lines.
Step 2
Set the nose gear unit onto the mounting rails with the
retract placed up against the front firewall and mark the
mounting hole locations.
Step 3
Remove the retract unit from the mounting rails and drill a
9/64-inch (4mm) hole on each of the marks.
Section 8: Retractable Landing Gear Installation
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