Honeywell MK VI - Manual (Page 101)

Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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2 #2 Heading Output
3 Do not use #2 output, reserved for autopilot only.
Note 3: The KI-525 must have the proper mod for HEADING TRANSMITTER output. The Heading valid output at J2-P needs to be
converted from ground active output to +28V active output using a external relay for use with EGPWS.
3.13.3 Digital – AR INC 429 AHRS Input (Cat. 11 ID 2 & 3)
Heading Input Select Type 2 (AHRS bus or equivalent) is a high speed, digital ARINC 429 signal having label
320. Heading Input Select Type 3 (AHRS bus or equivalent) is a high speed, digital ARINC 429 signal having
labels 320 and 314. For interface description see paragraph 3.12.3 Attitude Input Type 5.
3.13.4 Digital – AR INC 429 Dual IOC buses (Cat. 11 ID 254 & 255)
Heading Input Select Type 254 (IOC bus or equivalent) is a dual high speed, digital ARINC 429 signal having
label 314. Heading Input Select Type 255 (IOC bus or equivalent) is a dual high speed, digital ARINC 429 signal
having label 320. For interface description see paragraph 3.4.5 Air Data Type 255.
3.13.5 Instruction s
Using Appendix E Tables 5.2, 5.3.11 and 5.3.11-x as described above, select Heading Input Select
type that matches the aircraft configuration, feature preferences, and version (part number) being
installed.
Record the ID number for the Heading Input Select from Appendix E Table 5.3.11 under the Ident
No. heading for Step (Category) 11 in Appendix E Table 5.2.
Using the Heading Input Select number from Appendix E Table 5.3.11 as “x”, go to Appendix E
Table 5.3.11-x.
The electrical interfaces (pin-outs) for the Heading Input Select Type are shown in Appendix E
Table 5.3.11-x and are used to generate the installation wiring diagrams.