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B
Bearing Error equals the heading to TCAS Ramp Tester less the relative bearing
of intruder. Relative bearing to the intruder should be a positive number mea-
sured clockwise from north on the traffic display unit.
The largest acceptable TAS bearing error is +/- 30° except between 135° and
225° (aft of the wings) where the error could be larger.
On some installations, it may be necessary to run the Bore Sight Calibration
Procedure of TASDIAG in order to achieve the desired bearing accuracy perfor-
mance. This procedure is described in paragraph 11 below. See
more information on using TASDIAG.
11. Perform Bore Sight Top/Bottom Antenna Procedure (Optional)
This optional procedure is used during installation of the TAS system
to automatically align the top and bottom TAS antennas to the aircraft.
To begin the Bore Sight procedure, start by setting up the ramp tester
as described in
Using the IFR-201 Ramp Test Set, create a scenario to simulate a
Mode C transponder equipped aircraft at 2NM, at an altitude of 50,000
feet and an altitude rate of 0 FPM. Initiate this intruder scenario at the
0° heading.
Apply a radio altitude signal to the aircraft using the Radio Altimeter
Test Set or equivalent. Increase the radio altimeter to 2,000 feet or
greater. This will disable the WOW logic and put the aircraft systems in
the "AIRBORNE" mode.
If you do not want to observe the Ramp Tester Target on the Traffic Display, the
Radar Altimeter does not have to be defeated to run this procedure.
Start the TASDIAG Program. (Refer to
mation on the TASDIAG program).
Rev 3, August/2002
NOTE
NOTE
NOTE
Section
4.3.3,
paragraph E
NOTE
10609I03.CDL
KMH 880/KTA 870
Appendix D
(8).
Appendix D
for additional infor-
for
Page 4-38
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