Honeywell MKXXII installation manual Audio Output, Discrete Outputs

Honeywell

MK XXII EGPWS Installation Manual

3.2.7 Audio Output

The audio outputs consist of both an 8-ohm amplifier and a transformer isolated 600-ohm output. Audio output messages are provided as specified in the selected Audio Menu (Category 5) when inputs are valid and the audio inhibit discretes are not active.

When audio inhibit is enabled, the output discrete(s) associated with suppressed

message(s) are active.

3.2.8 Discrete Outputs

The MK XXII EGPWS provides for up to twelve 0.5 amp (1 amp maximum) Ground/Open discrete outputs. The discrete outputs are defined in Appendix E Category 13.

The discrete outputs are optional if the ARINC 429 output data is used for driving the alert/warning lamps via a symbol generator. Except for fully integrated cockpits, most Aircraft Types do not use the ARINC 429 output data for lamp control. (This data is typically sent to the Flight Data Recorder.)

All outputs to lamps are driven by solid state switches to ground. These outputs can also be used as discrete drivers for other devices (e.g. terrain display switching). See section 3.3.13.

3.2.9 Configuration Module

The EGPWS aircraft configuration is programmed into a configuration module installed in the aircraft wiring. This Configuration Module is identified as Honeywell part number 700-1710-001. The configuration module is installed as part of the P2 mating connector backshell and contains electrically reprogrammable memory for configuration storage. By this method the aircraft configuration is stored in the configuration module on the aircraft and each newly installed EGPWS computer does not require operator assisted programming before or during installation. The aircraft configuration in the Configuration Module can be changed at any time by use of the WinViews software, as explained in Section 4.

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