Description Of Alteration - Garmin 500W Series Instructions Manual

2.2 Description of Alteration

This STC upgrades existing avionics for the Bell 206B rotorcraft as summarized below.
The Garmin Model 500W Series GPS/WAAS Nav/Com unit is a 6 ¼ inch wide unit mounted in the center
pedestal of the Bell 206B. The 500W 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. 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.
Installation of optional remote HTAWS annunciators, and optional cyclic stick switches for remote control
of COM and HTAWS functions are also covered under this STC.
The 500W Series unit can interface to the Garmin G500H system GDU 620 PFD/MFD for display of
navigation information and HTAWS annunciation.
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 an overhead circuit breaker
panel as shown below. Note: dual navigator system installation as shown.
The installed 500W Series equipment can be accessed as described below:
500W Series 190-01226-03 Rev. 5
Instructions for Continued Airworthiness Bell 206B Page 6 of 23