400W Series
190-01226-14 Rev. 3
Instructions for Continued Airworthiness Bell 407
Page 24 of 26
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 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. Remove screws from 407-030-202-148 COVER, LOWER, RH.
2. Disconnect air duct from cooling fan port.
3. Remove 407-030-202-148 COVER, LOWER, RH.
4. Disconnect cooling fan electrical connector located next to fan cooling ports.
5. Remove two (2X) cooling fan screws and remove cooling fan.
2.7.3.2 Installation
1. Install cooling fan using removed hardware.
2. Reconnect electrical connector to cooling fan.
3. Connect air duct to cooling fan port.
4. Verifying silicone sponge foam used to seal cooling fan intake remains in place on 407-030-202-
148 COVER, LOWER, RH and properly seals the fan intake to the louver installed in 407-030-
202-148 COVER, LOWER, RH. Reinstall 407-030-202-148 COVER, LOWER, RH using
removed fasteners.
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 407, 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.
Summary of Contents for 400W Series
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