SUPPLEMENT SG-3
CHAPTER 31 - INDICATIONG SYSTEM
GDC 74A (ADC )
The GDC 74( ) air data computer receives information from the pitot/static system and
the GTP 59 outside air temperature (OAT) sensor. The GDC 74( ) is responsible for
providing pressure altitude, airspeed, vertical speed, and OAT information to the G500
system. The GDC 74( ) provides data to the GDU 620 and GRS 77 using ARINC 429
digital interfaces. The GDC 74( ) also communicates maintenance and configuration in-
formation to the GDU 620 using an RS-232 interface.
GTP59
It is the temperature probe which provides Outside Air Temperature (OAT) data
to the GDC74A.
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