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B
Monitor the altitude source in the cockpit. Set the baro to 29.92".
Observe the Enc. Altitude readout. The computer readout should
agree to within 50 feet of the cockpit altimeter.
The Enc. Alt. Status in the computer should indicate VALID.
Confirm the following Encoding Altitudes at the altimeter, Diagnostic
Computer and transponder:
The above test step checks both logic states for all Gillham lines. Other tests
may be adequate for some installations.
Flag the encoding altitude source by pulling the circuit breaker.
Verify that the Enc. Alt. Status goes INVALID.
Verify that the "TAS" flag appears on the traffic display.
Reset the circuit breaker. Verify that the "TAS" flag clears.
Enc. Altitude Source #1 Pass/Fail ______.
If applicable, select the other encoding source and repeat the above
steps.
Enc. Altitude Source #2 Pass/Fail ______.
If applicable, verify the attitude interface to the TAS Processor.
Rev 3, August/2002
Altitude at 2,000 feet, the computer screen indicates ______feet.
Transponder indicates ______ feet.
Altitude at 7,800 feet, the computer screen indicates ______ feet.
Transponder indicates ______ feet.
Altitude at 19,000 feet, the computer screen indicates ______ feet.
Transponder indicates ______ feet.
Altitude at 31,800 feet, the computer screen indicates ______ feet.
Transponder indicates ______ feet.
NOTE
10609I03.CDL
KMH 880/KTA 870
Page 4-30
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