Specifications
GNC 420
Plotter/Moving Map Features
Basemap: Worldwide Land; includes state/country boundaries, lakes, rivers,
railroads, cities, coastlines; U.S., state, and interstate highways, and
local thoroughfares
Plotting Scales:
1/10 to 3000 nm with push-button zoom control
Jeppesen® Database
Coverage: Americas, International or Worldwide
Airports:
Identifier, city/state, country, facility name, lat/lon, elevation,
fuel service, control, approach information
VORs:
Identifier, city/state, country, facility name, lat/lon, frequency,
co-located DME/TACAN, magnetic variation, weather broadcast indication
NDBs:
Identifier, city/state, country, facility name, lat/lon, frequency,
weather broadcast indication
Intersections: Identifier, country, lat/lon, nearest VOR
Frequencies: Approach, arrival, control area, departure, Class B, Class C,
TMA, TRSA (with sector, altitude, and text usage info), ASOS, ATIS, AWOS, center,
clearance delivery, tower, ground, unicom, pre-taxi, localizer, and ILS
Runways: Designation, length, width, surface, lighting, pilot-controlled lighting
frequency
FSS/ARTCC: Identifier, frequency, usage
MSA: Minimum safe altitude along and in proximity to active flight plan
Approaches: Non-precision and precision approaches throughout the database
coverage
DPs/STARs: Contains all pilot/nav DPs/STARs
Airspaces: Class
B & C with sectors; International CTA & TMA with
sectors; all SUAs, including MOAs; prohibited and restricted areas with controlling
agency and airport
Safety Features
Emergency Search: 9 nearest airports, VORs, NDBs, intersections, or user waypoints;
5 nearest FSS and ARTCC frequencies
Alarms: Arrival; timers; airspace alarms at 10 minutes, 2nm, and inside airspace
User Customization
Waypoints: 1,000 User Defined
Flight Plans: 20 reversible routes of up to 31 waypoints each
Certification
GPS: TSO C129a, Class A1 (en route, terminal, and approach)
Oceanic Approval: Fault Detection and Exclusion (FDE)
Performance
Receiver: PhaseTrac12™, twelve parallel channel receiver,
simultaneously
tracks and uses up to 12 satellites
Acquisition Time: 12 seconds (warm), 45 seconds (cold)
Update Rate: Once per second, continuous
Accuracy: Position: 15 meters (49 feet) RMS*
Velocity: 0.1 knot RMS steady state
Dynamics: Velocity (max): 999 knots
Acceleration(max): 6g's
Nav Features: Pilot-defined course selection and waypoint hold, closest point
of approach, departure and arrival frequencies, approach navigation using published
approach procedures stored on NavData card, terminal navigation using DPs/STARs
from NavData card
Planning Features: True airspeed, density altitude, winds aloft, RAIM availability,
sunrise/sunset times, trip and fuel planning, vertical navigation (VNAV)
Interfaces: ARINC 429, Aviation RS-232, CDI/HSI, RMI (digital: clock/data);
Superflag Out, Altitude (serial: Icarus, Shadin-Rosetta, encoded Gillham/Greycode),
Fuel Sensor, Fuel/Air Data, Stormscope, Skywatch, TCAD Map Datums: 124 and 1 user-defined
Frequency Display: Upper left corner of active matrix LCD, 2-lines with active
frequency above standby
Physical
Unit Size: Width = 6.25"; Height = 2.65"; Depth = 11.00" behind
panel, with connectors
Unit Weight: 4.9 pounds installed (400); 5.8 pounds installed (420)
Display: Color LCD
Power: 11-33 VDC;
28 VDC (420 "A")
Data Storage: Separate internal battery protects stored data for up to five
years
Enviromental
Temperature: -20°C to +55°C (operating range); -20°C to +70°C
(short-term operation)
Humidity: 95% non-condensing
Altitude Range: -1,500 ft to 50,000 ft
VHF COM Performance
Frequency Display: Upper left corner of active matrix LCD, 2-lines with active
frequency above standby
Channels: 760 (25 kHz spacing); configuration for 3040 channels
(8.33 kHz
spacing) also provided
Frequency Range: 118.000 MHz to 136.975 MHz
Transmit
Power: 10 watts minimum; 16 watts minimum (420 "A")
Modulation: 70%
Receive Sensitivity:2.0 µV for 6 dB S/N with 1 kHz
30% mod.
Squelch Sensitivity:2.0 µV typical
Audio Output: 100 mW minimum into a 500 ohm load; External amplifier required
to drive cockpit speaker
Additional Certifications
VHF COM: TSO C37d, Class 4 and 6 (transmit); TSO C37d, Class
3 and 5 (transmit) - 420 "A" and TSO C38d, Class C and E (receive)
Specifications are subject to change without notice.
Jeppesen is a trademark of Jeppesen, Inc