User's Manual Part 1

T
2
CAS / Part No. 9000000
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
34-43-20
15 Feb 2003
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
1--44
(h) IDENT Key
The IDENT key is a momentary button. When pushed, the IDENT key causes
an ATCRBS reply or Mode S UF -- 4 and UF-- 5 replies to contain a special pulse
identifier pulse (SPI) as an identifier to be transmitted to ground controllers in
accordance with ARINC 718 Draft 5 of Supplement 4.
(i) Flight Level Button
The FL button is a momentary button used to select between relative and
absolute altitude information. When absolute is selected, this mode is enabled
for approximately 20 seconds and then reverts back to relative.
(j) Test Button
The TEST button enables the user to initiate a system functional test. When the
TEST button is pushed, the control panel initiates an internal test while a
functional test output is also transmitted through ARINC 429 labels.
When installed with a TCAS system, a n extended test can b e initiated by
continuously pushing the TEST button for at least eight seconds.
(k) XPDR FAIL Annunciator
The XPDR FAIL annunciator displays the functional status of the active
transponder. The fail annunciator lights only when a failed transponder is
selected on the XPDR 1--2 switch.
F. TAWS Control Panel
The TAWS controls are used to control the displayed terrain data and TAWS inhibit
features. The TAWS control panels may be installed in a single or dual configuration
depending on the TAWS display capabilities.
The TAWS controls can be mounted on a single control panel or they can be discrete
switches individually mounted at a convenient location in the Flight Deck. The TAWS
controls may be part of the electronic display menu selection in installations where TAWS
information is displayed on an EFIS or electronic display.
G. VSI/TRA Display
The VSI/TRA display, Figure 1--13, is used to display current vertical speed and TCAS
traffic/warning information. The display consists of a full color, active matrix, liquid crystal
display panel. The display quality compares favorably to CRT displays but requires less
power, weight, and volume than a CRT with a similar display area. Table 1--9 gives items
and specifications particular to the unit. Figure 1-- 14 contains an interface block diagram
of the 41--p in VSI/TRA.