EFD1000 E5 Dual Electronic Flight Instrument (EFI) Install Manual
DOCUMENT # 900-00041-001
PAGE 124-226
REVISION D
© Copyright 2019 Aspen Avionics Inc.
Figure 9-19C: Cessna ARC 300A AC & DC version to ACU Interface
21
11
22
P3
HDG DATUM
CRS/HDG COM
HDG-CRS EXT
2
300A
Navomatic
18
17
20
ACU
CA-395A
(DC Datum)
J1
When replacing IG-832C, DC version HSI
Set ACU HSI TYPE = 1
Configuration Matrix
(see Section 10)
25
HDG-CRS OFFSET
66.5K 1%
9Vdc reference
1
ARC computer p/n 42660-2x0x only. (A3) Heading
Demodulator Assembly p/n 43368-0001
3
Connect 66.5K 1% 1/4W resistor from ACU P3
– 21 to pin 25
with 21 also connected to CA-395 pin 17. Output is as follows:
HDG BUG
DATUM VOLTAGE
-90º
0.5 Vdc
0º
4.5Vdc
+90º
8.5Vdc
Refer to autopilot manufacturers’ documentation for autopilot-
side integration information (including autopilot STC compliance
data) and for autopilot and flight director checkout procedures.
This drawing, as it pertains to the non-Aspen equipment, is for
reference only.
P2
9
11
18
37
+ RIGHT
+ LEFT
2
13
15
5
/ILS ENERGIZE
17
18
23
20
n/c
23
HDG-CRS EXT
n/c
n/c
CA-395A
(AC Datum)
J1
9
11
13
15
2Vac reference
4.5Vdc reference
1
When replacing G-502A or 504A, AC version DG
ARC computer p/n 42660-12XX
Do not use Resistor. Connect ACU P3-25 to CA-395 pin 23.
Output as follows:
HDG BUG
DATUM VOLTAGE
-90º
2.0 Vac
0º
0 Vac
+90º
2.0 Vac
The ac voltages will ride on a 4.5Vdc offset voltage
1
Set ACU HSI TYPE = 1
Set ACU DATUM = REVERSED
4
3
ILS Energize out may be used to operate a BC relay in the
Cessna Audio Control panel or external BC relay as needed.
1
2