Figure 2-9, Gsu-75B Adahrs With Connector And Mounting Tray - Garmin G1000 Nxi System Maintenance Manual

GSU 75B ADAHRS (2)
The GSU 75 ADAHRS is a combined Air Data and AHRS system. The units are mounted in the
nose equipment bay, contain advanced tilt sensors, accelerometers, rate sensors, static
pressure sensors, and pitot pressure sensors. The GSU 75B(s) receive GPS data from onside
and offside GIA 63W(s), and magnetic heading from the onside GMU 44 Magnetometer. The
#2 GSU ADAHRS units can provide heading data to an approved third party TCAS II device
through an ARINC 429 digital interface.
GSU 1 receives primary electrical power from the No. 1 Triple Fed Bus and a secondary power
supply from the Center Bus. GSU 2 receives electrical power from the No. 3 Triple Fed Bus.
The GSU(s) provide electrical power to the onside GMU 44 Magnetometer and the onside GTP
59 OAT probe.
GSU 1 and GSU 2 connect to existing pitot/static ports. Refer to Figure 2-28 for a schematic of
the aircraft's pitot/static system and its connections to the G1000 STC installed equipment.
Each GSU 75B provides the following information via ARINC 429 busses to both the onside and
offside GIA 63W(s) and PFD(s). GSU #1 also provides this information to the MFD.
•
Aircraft altitude and airspeed
•
Aircraft vertical speed, Mach and outside air temperature
•
Aircraft heading, pitch and roll
•
Aircraft yaw, pitch and roll rates
•
Aircraft body-axis accelerations
•
Rates of change of heading, pitch and roll
•
Aircraft accelerations expressed in a local level frame of reference
GSU 75B(s) are installed in lieu of separate ADC (GDC 7400) and AHRS (GRS 77 or GRS
7800). For this STC, mixed ADAHRS and ADC/AHRS configurations are not permitted.
Aircraft modified by this STC are eligible to be approved for RVSM operation.
RVSM critical maintenance instructions contained in this document must be
followed in order to guarantee performance within RVSM specifications.

Figure 2-9, GSU-75B ADAHRS with Connector and Mounting Tray

G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
IMPORTANT!
Page 14
Revision 1