400W Series
190-01226-04 Rev. 2
Instructions for Continued Airworthiness Bell 206B
Page 20 of 22
2
Remove old sealant. Insert a 3/32-inch hex drive tool into the access hole at the bottom of the
unit face.
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 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 400W 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 consol 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 400W Rotorcraft STC Installation Manual. Refer to the GNS 400W Series Post-
Installation Checkout Log retained in the rotorcraft permanent records for a list of the interfaced
equipment and port configurations.
