Figure 2-1, Display Units - Garmin G1000 Nxi System Maintenance Manual

Underspeed Protection:
Underspeed Protection (USP) is available when the optional ESP system is installed and the
autopilot is on. It is designed to discourage aircraft operation below minimum established
airspeeds. When the aircraft decelerates to stall warning, the autopilot will provide input
causing the aircraft to pitch down and wings to level. The pitch down force will continue until the
aircraft reaches a pitch attitude at which IAS equals the IAS at which stall warning turns off, plus
two knots.
GDU 1050A PFD (2) & GDU 1550 MFD
Two Garmin GDU 1050A displays and one GDU 1550 display are installed in the King Air
instrument panel. The GDU 1050A units, 10.4 inch LCD displays with 1024x768 resolution, are
configured as PFD 1 and PFD 2; the GDU 1550 unit, a 15 inch LCD display with 1400 x1050
resolution, is configured as a MFD. All displays provide control and display of nearly all
functions of the G1000 integrated cockpit system. The PFD displays are located on either side
of the MFD, with the stand-by instruments located between the Pilot's PFD (PFD 1) and the
MFD. GMA 1347D Audio Panels are located outboard of each PFD. Additionally, a GMC 710
AFCS Controller is located in the upper instrument panel, above the MFD, and a GCU 477 is
installed in the pedestal. The GCU 477 provides the control interface for the MFD.
The GDU 1550 communicates with the GDU 1050A units, GDL 69A /GDL69 SXM datalink,
GWX68 or GWX 70 weather radar, optional GDL59 Wi-Fi datalink and optional GTS 820/850 or
GTS Processor traffic through a high-speed data bus (HSDB) Ethernet connection. The GDU
1550 communicates with the GCU 477 via RS-232 digital interface.
The GDU 1050A units communicate with each other and the GIA 63W units through a high-
speed data bus (HSDB) Ethernet connection.
PFD 1 receives primary electrical power from No. 1 Triple Fed Bus and secondary electrical
power from Center Bus. PFD 2 receives electrical power from No. 3 Triple Fed Bus. Electrical
power to the MFD is provided by No. 2 Triple Fed Bus. The displays will power-up immediately
with external or aircraft power or battery operation.
All displays are installed in the King Air panel using ¼-turn fasteners. Three CDU cooling fans
are also installed behind the panel for PFD and MFD cooling.
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1

Figure 2-1, Display Units

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