13. B.
AT-91O Directional Antenna (See figure 13-3 and table 13-5.)
AD-32828@
AT-91O Directional Antenna
Figure 13-3
Dimensions (maximum)
Height Outside Aircraft . . . . . . . . . . . . . .806 in.
(20.47 mm)
Height Inside Aircraft . . . . . . . . . . . . . 1.56 in. (39.62 mm)
Diameter . . . . . . . . . . . . . . . . . . . 9.31 in. (236.47 mm)
Weight . . . . . . . . . . . . . . . . . . . . . . . . .2.801b(l.30 kg)
Mating Connectors:(4) . . . . . . . . . . . . . . . . . . . .. TypeTNC
Mounting Adapter . . . . . . . . . . . . . . . . . . . . .
HPN 7514081-910
AT-91O Directional Antenna Leading Particulars
Table 13-5
The AT-91O directional antenna mounted on top of the aircraft fuselage
in conjunction with four receivers in the TCAS
computer unit provide the
capability to determine the bearing of the intruder.
Since
TCAS II is a
vertical-only system, intruder bearing is not used in the computation of
the escape or limit maneuver.
Intruder bearing is used only to enable
the flight crew to more easily locate the intruder visually.
The
Honeywell TCAS
II will also accommodate a bottom mounted directional
antenna if so desired by the
user (refer to paragraph 13.C.). Such an
installation will slightly increase the areas in which bearing informa-
tion is available.
The AT-91O directional antenna is connected to the
TCAS computer unit by four coaxial cables.
22-14-00
Page 198.189
Apr 15/93
Useor disclosure of information onthispage issubject totheresttictions on the title page of this document.
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