Garmin GAD 43 Installation Manual - Page 12

Yaw Rate/Baro Correction

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1.2 Equipment Description 1.2.1 System Interface Functions • Interfacing with the GRS 77 AHRS. • Interfacing with the GDU 620 for GAD 43 configuration and display of GAD 43 alerts. • Interfacing to autopilots that are compatible with the gyros identified in Table 5-1 to provide pitch and roll attitude (including valid relays), heading (including valid signal), yaw rate, and barometric correction information. For the system to completely meet TSO-C9c, the autopilot must claim TSO-C9c and be compatible with the gyros listed in Table 5-1. 1.3 Interface Summary The GAD 43 is designed as an open architecture system that uses typical ARINC 429, and RS-232 communication interfaces. Various analog interfaces (including ARINC 407) are also supported. All interfaces are described in the following sections. 1.3.1 ARINC 429 Interface The GAD 43 has one ARINC 429 input port to support input from the GRS 77 AHRS. 1.3.2 RS-232 Interface The GAD 43 has one RS-232 serial port to support communication with the GDU 620. 1.3.3 Analog Interfaces The GAD 43 is capable of emulating numerous gyro interfaces, as described in the following sections. 1.3.3.1 Power Supply Outputs The GAD 43 can provide DC and AC power supply outputs when interfaced to a 115 VAC reference. Power supply outputs of +26 VDC, 26 VAC, and 5 VAC are provided. The AC supplies are in-phase with the 115 VAC reference; the +26 VDC supply may be used to provide validity information using the relays. 1.3.3.2 ARINC 407 The GAD 43 can provide three 3-wire ARINC 407 synchro outputs - one each for pitch, roll, and heading. The GAD 43 also provides two 2-wire isolated synchro outputs - one each for pitch and roll. An input for AC reference voltage is provided and is used for signal polarity. 1.3.3.3 Analog Pitch / Roll The GAD 43 has one set of pitch and roll analog outputs. These outputs are provided for the emulation of panel mount gyros. An input for AC reference voltage is also provided and is used for signal polarity. 1.3.3.4 Yaw Rate/Baro Correction The GAD 43 has one analog output that can be configured to provide either yaw rate or baro correction information. 1.3.3.4.1 Yaw Rate The GAD 43 has an analog yaw rate output for autopilots that accept standard analog rate information. 1.3.3.4.2 Barometric Correction For installations that do not utilize the yaw rate output, the same pins can be provided to supply analog barometric correction information to the autopilot computer. This correction information emulates the analog output (pickoff) of the standard King altimeter. Page 1-2 Rev. B GAD 43 Installation Manual 190-00899-00

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Page 1-2
GAD 43 Installation Manual
Rev. B
190-00899-00
1.2 Equipment Description
1.2.1 System Interface Functions
•
Interfacing with the GRS 77 AHRS.
•
Interfacing with the GDU 620 for GAD 43 configuration and display of GAD 43 alerts.
•
Interfacing to autopilots that are compatible with the gyros identified in Table 5-1 to provide
pitch and roll attitude (including valid relays), heading (including valid signal), yaw rate, and
barometric correction information. For the system to completely meet
TSO-C9c, the autopilot must claim TSO-C9c and be compatible with the gyros listed in
Table 5-1.
1.3 Interface Summary
The GAD 43 is designed as an open architecture system that uses typical ARINC 429, and RS-232
communication interfaces. Various analog interfaces (including ARINC 407) are also supported. All
interfaces are described in the following sections.
1.3.1 ARINC 429 Interface
The GAD 43 has one ARINC 429 input port to support input from the GRS 77 AHRS.
1.3.2 RS-232 Interface
The GAD 43 has one RS-232 serial port to support communication with the GDU 620.
1.3.3 Analog Interfaces
The GAD 43 is capable of emulating numerous gyro interfaces, as described in the following sections.
1.3.3.1
Power Supply Outputs
The GAD 43 can provide DC and AC power supply outputs when interfaced to a 115 VAC reference.
Power supply outputs of +26 VDC, 26 VAC, and 5 VAC are provided.
The AC supplies are in-phase
with the 115 VAC reference; the +26 VDC supply may be used to provide validity information using the
relays.
1.3.3.2
ARINC 407
The GAD 43 can provide three 3-wire ARINC 407 synchro outputs – one each for pitch, roll, and
heading.
The GAD 43 also provides two 2-wire isolated synchro outputs – one each for pitch and roll.
An input for AC reference voltage is provided and is used for signal polarity.
1.3.3.3
Analog Pitch / Roll
The GAD 43 has one set of pitch and roll analog outputs. These outputs are provided for the emulation of
panel mount gyros.
An input for AC reference voltage is also provided and is used for signal polarity.
1.3.3.4
Yaw Rate/Baro Correction
The GAD 43 has one analog output that can be configured to provide either yaw rate or baro correction
information.
1.3.3.4.1 Yaw Rate
The GAD 43 has an analog yaw rate output for autopilots that accept standard analog rate information.
1.3.3.4.2 Barometric Correction
For installations that do not utilize the yaw rate output, the same pins can be provided to supply analog
barometric correction information to the autopilot computer.
This correction information emulates the
analog output (pickoff) of the standard King altimeter.