2.7.2 GA 35 GPS, GA 36 GPS, and GA 37 GPS/XM Antennas
2.7.2.1 Removal
1. Remove the screws from the outside of the rotorcraft.
2. Remove old sealant.
3. Lift the antenna off the rotorcraft and detach the coax (from the outside). If a GA 37 antenna
verify coax(s) are properly labeled with correct color band. Note: GPS coax is labeled with a blue
band and XM cable with a yellow band.
2.7.2.2 Installation
For GA 35, GA 36, or GA 37 GPS antenna installation, follow the installation procedures contained in the
installation drawing listed in paragraph 2.1 of this document.
2.7.2.3 Return to Service
After removing and reinstalling the GPS antenna, verify the 500W Series unit power-up self-test
sequence is successfully completed and no failure messages are annunciated. If the unit is unable to
acquire satellites, move the rotorcraft away from obstructions which might be shading GPS reception. If
the situation does not improve, check the GPS antenna installation.
2.7.3 Cooling Fan
2.7.3.1 Removal
1. Extract the screws from the copilot side (LH side) center console cover plate.
2. Remove copilot side (LH side) center console cover plate.
3. Disconnect cooling fan electrical connector located under cooling ports on fan.
4. Extract the three (3X) cooling fan mounting screws to remove cooling fan.
2.7.3.2 Installation
1. Install cooling fan using removed hardware.
2. Reconnect electrical connector to cooling fan.
3. Reinstall center console cover plate using removed hardware, verifying silicone sponge foam
used to seal cooling fan intake remains in place on center console cover plate and properly
seals the fan intake to the louver installed on the center console cover plate.
2.7.3.3 Return to Service
After removing and reinstalling the cooling fan verify proper operation of the cooling fan. Apply power to
the avionics, verify the cooling fan is operating and the FAN FAIL light on the annunciator panel is not
illuminated.
2.8 Diagrams
Rotorcraft specific LRU locations and wire routing diagrams are contained in the 400W/500W Series
Installation drawing Bell 206B, listed in Section 2.1 of this document. Point to point wiring diagrams are
in the Appendix of the 500W Rotorcraft STC Installation Manual. Refer to the GNS 500W Series Post-
Installation Checkout Log retained in the rotorcraft permanent records for a list of the interfaced
equipment and port configurations.
500W Series
Instructions for Continued Airworthiness Bell 206B
190-01226-03 Rev. 5
Page 21 of 23
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