GNC 420(A) Pilot’s Guide and Reference
APPENDIX B
SPECIFICATIONS
B-1
APPENDIX B: SPECIFICATIONS
PHYSICAL
Unit Size: 6.25’W x 11.00’D x 2.65’H
(159 mm x 279 mm x 67 mm)
Unit Weight: 5.9 pounds installed (2.6 kg)
POWER*
Input: 28 Vdc (early 420, all 420A units)
14/28 Vdc (later 420 units)
ENVIRONMENTAL
Temperature: -20°C to +55°C (operating range)
(-4°F to +131°F)
Humidity: 95% non-condensing
Altitude: -1,500 ft to 50,000 ft
(-457 m to 15,240 m)
GPS PERFORMANCE
Receiver: 12 parallel channel PhaseTrac12™
Acquisition Time: 12 seconds (warm)
45 seconds (cold)
Update Rate: Once per second, continuous
Accuracy: Position - 15 meters (49 ft) RMS
Velocity - 0.1 knot RMS steady state
Dynamics: 999 kts maximum velocity
6g maximum acceleration
VHF COM PERFORMANCE
Channels: 760 (25 kHz spacing)
or 2280 (8.33 kHz spacing)
Frequency Range: 118.000 MHz to 136.975 MHz
Transmit Power: 10 watts minimum (420)
16 watts minimum (420A)
INTERFACES
ARINC 429; Aviation RS-232; CDI/HSI; RMI (digital:
clock/data); Superag Out; Altitude (serial: Icarus,
Shadin, Rosetta, or encoded: Gillham/Greycode);
Fuel Sensor; Fuel/Air Data
* Earlier versions of the 420 were designed to be used
with 28 Vdc power only. For questions on a particular
installation, please refer to a Garmin authorized
service center.
190-00140-20 Rev. K
