Honeywell BENDIX KING KMH 880 System Installation Manual page 202

B
Another test to check the Advisory Inhibit Inputs can be performed with
the Diagnostic Computer.
Initiate the TAS self-test.
As soon as the "TAS SYSTEM TEST OK" message begins, press
the GPWS Test switch or simulate a GPWS advisory. TAS audio is
interrupted.
Pass/Fail ______.
Initiate the TAS self-test.
As soon as the "TAS SYSTEM TEST OK" message begins, press
the Wind Shear test switch or simulate a Wind Shear advisory. Verify
the TAS audio is interrupted.
Pass/Fail ______.
10. TAS Bearing Accuracy is required for STC Approval.
Evaluate the performance of the directional antenna for 360° coverage
at 30° intervals.
Whenever checking the TAS bearing accuracy, the test antenna must be within
line-of-sight of the directional antenna under test. The accuracy to the top direc-
tional antenna should be checked while the test antenna is 50 to 75 feet distant,
and the landing gear logic is "DOWN". When measuring the accuracy of the bot-
tom antenna, the test antenna should not be within line-of sight of the top direc-
tional antenna. Either use the fuselage to block the top directional antenna and
position the test antenna 8 to 12 feet from the bottom antenna or shield the top
antenna with echosorb or equivalent. The landing gear logic must simulate
"RETRACTED" (UP) whenever checking the bearing accuracy to the bottom
antenna. TAs will appear as "No Bearing" targets when the gear position logic is
"EXTENDED" (DOWN) because the bottom antenna is in omni directional mode.
To insure proper antenna selection, the relative altitude difference between
the simulated intruder and own aircraft altitude should be + 6,000 feet (or
greater) when checking the top antenna. The test antenna should be ele-
vated slightly above the height of the top directional antenna.
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NOTE
10609I00.ZIPCDL
KMH 880/KTA 870
Rev 0, October/2000