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C. Each of the four elements of the directional antenna has a resistor that goes from the antenna element to ground. Each of the four resistors has a different value. The TCAS computer regularly does a continuity test on the antenna ports and will see the correct resistance value if the port is not shorted and not open.
4. IDS Displays (Fig. 3)
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A. The Primary Flight Displays (PFD) and Navigation Displays (ND) are installed on the pilots' instrument panels. The TCAS traffic are displayed on the ND and resolution advisories are displayed on the PFD.
B. The traffic (TFC) switch on the EFIS control panel enable TCAS operations to be shown the ND. TCAS traffic can only be shown on these EFIS modes: Expanded map mode, expanded approach mode, expanded VOR mode, and center map mode.
C. Traffic is displayed on the ND to help the pilots see the intruder airplanes before RA threat conditions occur. The ND can display of up to 30 intruder airplanes that are equipped with Mode S or ATCRBS Transponders. The intruders must be detected on a directional antenna, and must be found within the display range.
D. Graphics shown on the ND tell the pilots about local air traffic TA and RA conditions and show TCAS operation modes and system failure indication.
E. Graphics shown on the PFD tell the pilots to pull up (climb) or push down (descend). The graphics are represented as vertical pitch advisory the pilots must attain.
F. For airplanes with resolution advisories also shown on the IVSI, the graphics tell the pilots to climb or descend at a certain vertical speed range. The red band on the vertical speed tape is the vertical speed range to avoid. The green band on the vertical speed tape is the vertical speed range the pilots must attain.
(1) TCAS Indications on the ND: ~............................................................... | INDICATION | DESCRIPTION | ................................................................. | TFC (BLUE) | Traffic display enable on the ND. | .................................................................
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NAVIGATION DISPLAY
(FULL ROSE VIEW)
NAVIGATION DISPLAY
(EXPANDED VIEW)
TCAS EFIS Displays
Figure 3 (Sheet 1)
C17381
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PRIMARY FLIGHT DISPLAY
TCAS EFIS Displays
Figure 3 (Sheet 2)
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| TCAS TEST (BLUE) | TCAS system on self-test mode. | ................................................................. | TCAS FAIL (YELLOW) | TCAS computer fails. | ................................................................. | TCAS OFF (YELLOW) | TCAS system not active. | ................................................................. | TA ONLY (BLUE) | Traffic Advisory ONLY mode. | ................................................................. | OFFSCALE | When intruder airplane is out of | | (YELLOW/RED) | display range or is within a display| | | priority area. The OFFSCALE | | | indication will be yellow if the | | | intruder airplane is classified as a| | | TA and red for RA. | ................................................................. 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：747-400 AMM 飛機維護手冊 導航 NAVIGATION 2(164)
