Section 4 Post-Installation Configuration, Calibration, And Checkout; Post Installation Checks; Installation Setup And Test - Honeywell BendixKing KT 74 Installation Manual

POST-INSTALLATION CONFIGURATION, CALIBRATION,

4.1 Post Installation Checks

Post installation checks should be carried out in accordance with your certification
requirements. These checks should include:

Mode S interrogations to verify correct address programming.

Verification of the reported altitude using a static tester. For aircraft using Gillham
code encoders, the test should include a range of altitudes up to 6,800 feet (2.07
km), 14,800 feet (4.5 km) or 30,800 feet (9.39 km), depending on the service
ceiling of the aircraft – these altitudes correspond to code changes which are not
otherwise tested at lower altitudes.

Where installed, verification of correct squat switch ground/airborne indications.
In an aircraft with a squat switch, setting the Mode switch to ALT when the aircraft
is on the ground should leave the transponder in GND mode; when the aircraft
becomes airborne, the mode should switch automatically to ALT.

Interrogations to verify the receiver sensitivity. A Mode S transponder should
have a MTL of between -77 dBm and -71 dBm. Failure to meet this requirement
usually indicates antenna or coaxial cable problems.

Interrogations to verify the transmitted power. A Class 1 installation should have
no less than 125 Watts at the antenna (and no more than 500 Watts). Failure to
meet this requirement is also generally due to antenna or wiring issues.

Where installed, verification of the GPS position source and ADS-B outputs. In an
aircraft with a configured GPS, pressing the FUNC button on the transponder
front panel in normal operation will display the ADS position monitor. With the
aircraft outside the hangar (for good GPS reception) the aircraft position should
be displayed on the transponder. If the position indications are all dashes then
either the GPS position is not valid or the GPS interface is not correctly
configured. Whenever a valid position is received by the transponder and the
transponder is in any mode other than Standby, ADS-B Extended Squitters
should be observed on the transponder test set.

Where installed, verification of the TIS-A output. A Mode S test set with TIS-A
capability should be used; with the transponder in ALT mode traffic should be
shown on the attached display.

4.2 Installation Setup and Test

The KT 74 uses a simple setup system to program important system parameters,
including the Mode S address. In the original factory configuration, the setup screen
is the first thing that runs when you switch on the transponder. If the transponder has
already been configured, and you want to access the setup screen again, simply hold
down the FUNC button while switching on the transponder and the setup system will
run.
© Honeywell International Inc. Do not copy without express permission of Honeywell.
INSTALLATION MANUAL
89000007
SECTION 4
AND CHECKOUT
Page 4-1
15 Nov 2013