Honeywell MK VI - Manual (Page 30)

Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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installed in a location convenient for operation, inspection, and maintenance, and in an area free from excessive
vibration, heat, and noise generating sources.
The MK VI and MK VIII EGPWS have an internal heater blanket therefore they can be mounted outside the
heated area of the aircraft. The computers have been qualified for operation up to 50,000 feet and -55°C using
the heater blanket.
All mechanical installation drawings, connector assembly diagrams, interwiring diagrams, and connector pin
assignment tables referenced in this section are located at the end of Section II of this manual. Determine the
mounting location for the system components following the guidelines below.
Prior to installing any equipment, make a continuity check of all wires and cables associated with the system.
Then apply power and check for proper voltages at system connectors, and then remove power before
completing the installation.
To allow for inspection or repair of the wiring of the connector assembly itself, sufficient lead length should be
left so that EGPWS may be moved several inches. A bend should be made in the harness to allow water
droplets that might form on the harness due to condensation, to drip off at the bend and not collect in the
connector.
NOTE
For retrofit installations of classic MK VI GPWS and installing a EGPWS with internal GPS,
the connector backshell of the classic MK VI P1 connector will interfere with the GPS
antenna connector on the front of the EGPWS. The connector backshells chosen for the
EGPWS kits now extends straight out and does not interfere with the GPS antenna
connector.
The length of cables from the EGPWS connectors to other system units is not generally critical because unit
interfaces are designed with high impedance inputs, low impedance outputs, and low noise susceptibility
characteristics. The exception is the wires from the EGPWS Configuration Module, which was designed to be a
part of the EGPWS connector backshell because of the requirement for short lead length. Follow aircraft
manufacturer’s, sub-system manufacturer’s or ARINC specifications for shield grounding.
2.3.3 MK VI/ MK VIII Computer Installation
The MK VI and MK VIII EGPWS installation will conform to standards designated by the customer, installing
agency, and existing conditions as to the unit location and type of installation. However, the following
suggestions will assure a more satisfactory performance from the equipment.
A. Plan a location on the aircraft so that the EGPWS is accessible for front panel maintenance controls. Check
to be sure that there is adequate space in the front of the computer for connectors and cabling.
B. Refer to Figure 2-2 and 2-3 for outline dimensions of the computer and mounting tray.