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B
Additionally, the fault source can be viewed on the radar
indicator or by reading the LED fault code on the processor.
Verify the heading source interface to the TAS Processor. Confirm the
heading source and measure the inputs at the KMH/KTA Processor.
Refer to the drawings for the proper pin assignments.
The TAS and heading system should be operating normally for the
following test. Connect the Diagnostic Computer to the KMH/KTA
through the RS-232 port. Run the TASDIAG Input Data program and
observe the following on the Diagnostic Computer.
Monitor the heading source in the cockpit. Observe the Mag. Heading
readout on the computer. The computer readout should agree to
within a few degrees with the cockpit heading display. Record a
heading other than North (0.0°) _________.
The Heading Status on the computer should indicate VALID. The
heading type should indicate Synchro or ARINC 429.
Flag the heading source by pulling the circuit breaker.
Verify that the Heading Status goes INVALID.
Verify that the "TAS" flag appears on the traffic display.
Reset the circuit breaker. Verify that the TAS flag clears.
Pass/Fail ______
5.
Verify that the encoding altitude is properly interfaced to the TAS
Processor. Confirm that the encoding altitude of the transponder and
TAS agree.
PRECAUTIONS MUST BE TAKEN TO INSURE THAT THE ALTITUDE TEST
OF THE TRANSPONDER DOES NOT INTERFERE WITH OTHER TCAS/TAS
EQUIPPED AIRCRAFT. SHIELDING THE TRANSPONDER AND TAS ANTEN-
NAS IS THE BEST WAY TO PREVENT INTERFERENCE WITH OTHER AIR-
CRAFT.
The TAS, transponder and encoding altitude source(s) should be
operating normally for the following test. Connect the Diagnostic
Computer to the KMH/KTA through the RS-232 port. Run the
TASDIAG Input Data program and observe the following on the
Diagnostic Computer.
Rev 3, August/2002
CAUTION
10609I03 CDL
KMH 880/KTA 870
Page 4-29
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