
400W Series Rotorcraft 190-00356-21 Rev. C
Instructions for Continued Airworthiness Page 6 of 15
2.2 Description of Alteration
The Garmin Model 400W Series GPS/WAAS Nav/Com unit is a 6 ¼ inch wide panel mounted unit with
all the interface connections behind the instrument panel. The 400W Series units combine a large
number of easily acceptable controls to use the color multi-function display, Nav and Com transceiver,
GPS/WAAS navigator in a single unit. The 400W series control and display layout is shown in Figure 1.
OBS
Key
Power and Com
Volume/Squelch
otoce
for Auto-
Dimming
Graphic Moving
Map Display and
Navigation Info
Procedure Key
Range Keys
Enter Key
Direct-To Key
Menu Key
Function and
Page Number
Clear Key
Comm Freq
Flip/Flop
Nav Radio
Flip/Flop
Nav Radio
Volume
Small Knob
Com/VLOC
Freq (kHz)
Com Freq
Window
Small Knob
(Cursor - Press
to activate)
Large Knob
Data
Cards
Flight Plan
Key
Mounting
Screw
Message
Key
CDI
Key
Navigation
Source: GPS,
VLOC, or
P
-PT
Nav Freq
Window
Large Knob
Com/VLOC
Freq (MHz)
Terrain, Flight
Phase, and
GPS Integrity
Annunciator
Figure 1: 400W Series Control and Display Layout
For a list of equipment interfaced to the 400W Series unit as installed in this installation refer to Table 1
below. For interfaced system installation configuration refer to the GNS 400W Series Post-Installation
Checkout Log that is retained as part of the rotorcraft’s permanent records.
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