Garmin GNC 420AW Pilot El Kitabı Eki - Sayfa 18

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Section 4

Ryan TCAD Interface

SECTION 4: RYAN TCAD INTERFACE

All information in this section pertaining to the dis-

play and control of the Ryan 9900B TCAD also applies

to the Ryan 9900BX TCAD except for the following:

• TCAS-like symbols are used in the 9900BX.

TCAD symbols are used with the 9900B (see the

table on page 17).

• Altitude modes are available (normal, look up,

look down, unrestricted).

• Ranges are manually controlled instead of being

automatically re-sized to the current shield.

• Traffic display range selections are different:

- Ryan 9900B—range is slaved to current shield

size.

- Ryan 9900BX—1 NM, 1 and 2 NM, 2 and

6 NM, 6 and 12 NM, and 12 and 24 NM.

See the Ryan TCAD Pilot's Handbook for a

description of the traffic symbols.

Ryan TCAD Description

NOTE: Refer to the Ryan TCAD Pilot's Guide for a

detailed description of the Ryan TCAD System.

The Ryan TCAD (Traffic and Collision Alert

Device) is an on-board air traffic display used to

identify potential collision threats. TCAD computes

relative altitude and range of threats from nearby

Mode C and Mode S-equipped aircraft. TCAD will not

detect aircraft without operating transponders or those

that are beyond radar coverage. TCAD, within defined

limits, creates a "shield" of airspace around the aircraft

that detected traffic cannot penetrate without trigger-

ing an alert.

Operator Controls and Basic Displays

If there is no communication between the

400W/500W Series unit display and the TCAD unit, a

message will appear, notifying the user. After initial-

ization, proceed with operation of the 400W/500W

Series unit in a normal manner. TCAD data can be

shown in a "thumbnail" view on the Map Page.

The Map Page can display TCAD traffic in any

of the top three fields (or top four fields on a

500W Series unit) located on the right-hand

TCAD data also displays on the Traffic Page and

Map Pages, if heading data is available. The symbols

for closing and opening traffic shown on both the Map

Page and the Traffic Page are identical to those shown

on the Ryan TCAD:

190-00356-31 Rev. C

side of the display.