Install Manual

Preliminary
SKY899
Installation Manual
C-4
Rev. A
b. If the information is not correct, the sensor has failed to communicate with the TRC. Check
operation of the sensor and connections between the TRC and sensor.
c. Select exit until you return to the Service Menu.
10. Do SKY899 self test (paragraph 3.4).
11. From the Service Menu, select Ground Test (see paragraph 4.4.4).
12. From Ground Test menu, select Perform Ground Test.
13. Verify operation of range function. Soft-key (3) is labeled to indicate the current range. Press soft-key
(3) to toggle the display range between 2, 6 and 15 nm.
14. Select the 6 nautical mile range.
15. Verify that the system toggles through the altitude display modes. Soft-key (2) is labeled to indicate
the current mode. Press Soft-key (2) to select normal (NRM), below (BLW), and above (ABV).
16. Select the NRM (normal) mode.
17. Position the aircraft with the nose aligned on any 90 degree heading. Avoid areas within 250 ft of
obstructions (e.g., hangers, large aircraft, control towers, etc.) where there is a potential for multipath
problems. Locate and mark test points, every 30 degrees (i.e., at 000, 030, 060, 090, 120, 150, 180, 210,
240, 270, 300, and 330 degrees with respect to the SKY899 directional antenna). Mark these points at
the same distance, approximately 100 ft, from the aircraft.
18. Do the following static tests:
a. Connect the TCAS-201 Flat Antenna (facing towards the test aircraft) to the antenna connector.
b. At the TCAS-201 test set, press the REPLY TEST key.
c. Initiate the REPLY TEST by pressing the ANTENNA push button switch or the RUN/STOP
key.
NOTE
The TCAS-201 display will indicate “NO WHISPER-SHOUT SEQUENCE”.
d. Verify that the SKY899 display shows an other traffic symbol (open diamond) at the 12 O'clock
position (±30 degrees), approximately 5.0 nm, in level flight, and at an altitude of 500 ft above
own aircraft (i.e., "+05").
NOTES
1. If the display reflects a gross error in target bearing, check the directional antenna cables
at TRC connectors J9 (sum port) and J11 (difference port). They may be reversed. A further
indication of this condition would be a target that moved in a counter-clockwise direction
when the test set is moved in a clockwise direction.
2. Multiple targets or a faulty bearing may result from multipath distortion
(see step 2).
3. During these tests, the SKY899 may detect and display other active targets.
e. Repeat a, b, c, and d from each of the test points (see step 2).
19. Do the following dynamic test.
a. Position the ramp test set on the test point directly in front of the test aircraft (i.e.,
approximately 100 ft in front of the aircraft, see step 2).
b. Connect the TCAS-201 Flat Antenna (facing towards the test aircraft) to the antenna connector.
c. At the TCAS-201 test set, press the SCEN key.
d. Initiate the SCENARIO TEST by pressing the ANTENNA push button switch or the
RUN/STOP key.