400W Series
190-01226-04 Rev. 2
Instructions for Continued Airworthiness Bell 206B
Page 5 of 22
2.2 Description of Alteration
This STC upgrades existing avionics for the Bell 206B rotorcraft as summarized below.
The Garmin Model 400W Series GPS/WAAS Nav/Com unit is a 6 ¼ inch wide unit mounted in the center
pedestal of the Bell 206B. The 400W Series units combine a large number of easily accessible controls
to use the color multi-function display, Nav and Com transceiver, GPS/WAAS navigator in a single unit.
A GPS/WAAS antenna is installed on the top of the Bell 206B forward engine cowl. The 400W Series
unit interfaces to the Garmin G500H system GDU 620 PFD/MFD for display of navigation information,
and optional cyclic stick switches for remote control of COM and HTAWS functions. A monitored avionics
cooling fan is installed in the center pedestal with a fan fail fault annunciation located in the existing Bell
206B annunciator panel.
Rotorcraft modified under this STC are restricted to VFR only, including rotorcraft that may not have
previously been restricted to VFR. To clarify this operation limitation, a placard with the text,
“APPROVED FOR DAY/NIGHT VFR” is required to be in the pilot’s view.
The installed equipment is connected to an avionics bus that receives power as soon as the battery and
avionics master switches are turned on. Circuit breakers are installed on a lower circuit breaker panel
located in the DART console as shown below. Note: dual navigator system installation as shown.
The installed 400W Series equipment can be accessed as described below:
LRU Access: Bell models 206B
1.
GA 36/37 ANTENNA: FS80.0 remove by extracting the four mounting screws in the body of
the antenna. Note: location may vary slightly depending whether or not a dual navigator
system is installed.
2.
OVERHEAD CIRCUIT BREAKER PANEL: FS61.0, WL 71.0 Access or remove by extracting
the mounting screws along the side of the circuit breaker panel.
3.
CYCLIC CONTROL GRIPS: remove by extracting mounting screw at bottom of grip.
4.
COOLING FAN: FS28.5 Access by removing copilot side (LH) cover plate. Remove by
extracting three mounting screws and disconnecting connector.
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