FreeFlight 2101 I/O Approach Plus Installation And Checkout Manual page 31

• Fastening to Fuselage (for 16248-11 antenna)
Do not tighten screws with more than 20 inch-pounds of torque. Damage to antenna will result and void
warranty. Torque value = 18 ±2 inch-pounds.
Install screws through antenna, gasket, and aircraft skin into captive nut plates. Tighten the screws to 18 ±2 inch-
pounds of torque. Use non-corrosive RTV or similar sealant to seal around antenna base and screw holes.
2.3.3.4.2 81194 Antenna
• Fastening to Fuselage (for 81194 antenna)
The mounting holes may be drilled at .22 inch through or threaded at 10-32 UNS-2B. The connector hole is 1.25
inch diameter. Refer to Figure 2-4.
• Shim Fabrication for Curved Surfaces
The GPS antenna is designed for mounting on a flat surface and must not be warped due to mounting surface
curvature. To fit a curved fuselage, fabricate a shim or an adapter plate to fit the antenna. Use aluminum (7075
T6) or phenolic material to manufacture the shim.
Aluminum shims can be riveted to the aircraft. To seal the aluminum shim to the aircraft, use Product Research
polysulfide adhesive PR 1221 or equivalent.
Phenolic material shims can also be used. In this case apply Dow Corning Q3-6093 around the circumference
of the shim/aircraft seam.
Do not tighten screws with more than 28 inch-pounds of torque. Damage to antenna will result and void
warranty.
Install screws through antenna and aircraft skin into captive nut plates. Tighten the screws to 26 ±2 inch-pounds
of torque.
Revision E
May 31, 2006
FreeFlight 2101 I/O Approach Plus GPS Navigation System
CAUTION
CAUTION
Page 2-3