EFD1000 Installation Manual
DOCUMENT # A-01-126-00 PAGE 81-225 Revision H
© Copyright 2009 Aspen Avionics Inc.
Cessna ARC Flight Director Input
When the EFD1000 is configured for ACU FD TYPE = 3 the ACU will accept Cessna ARC
Flight Director output levels emulating the G-550 Artificial Horizon Indicator.
NOTE: ACU Software Version A-02-178-1.1 or subsequent is required for the
G- 550A Flight Director emulation.
Pitch Scaling: 0Vdc = null, +0.5Vdc = 20º up, -0.5Vdc = 20º down
Roll Scaling: 0Vdc = null, +0.5Vdc = 20º right, -0.5Vdc = 20º left
Load: 6650 ohms across single ended input
Century Flight Director Input
When the EFD1000 is configured for ACU FD TYPE = 4 the ACU will accept Century
Flight Director output levels, emulating the 52C77 Flight Director.
NOTE: ACU Software Version A-02-178-1.1 or subsequent is required for the
52C77 Flight Director emulation.
Pitch Scaling: 6Vdc = null, 9Vdc = full up, 3Vdc = full down
Roll Scaling: 0Vdc = null, +10Vdc = full right, -10Vdc = full left
Load: 55000 ohms across differential input
Flight Director Valid Input
A single high level valid discrete supplied by the flight director computer indicating
validity of the command bar signals to the ACU.
Valid: Greater than 5Vdc
Invalid: Less than 2Vdc
Flight Director Engaged Input
A single high level valid discrete indicating the pilot has engaged the flight director.
Engaged: Greater than 5Vdc
Disengaged: Less than 2Vdc
Heading Valid Output
Active low discrete output indicating the PFD directional gyro is valid.
Valid: Sinks to ground
Invalid: Open
Load Current: 100ma maximum
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