User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
344323
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Page 136
15 Dec 2005
Table 19. VSI/TRA Leading Particulars
Item Specification
Dimensions (maximum):
Height . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.26 in. (82.8 mm)
Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.26 in. (82.8 mm)
Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.42 in. (239.3 mm)
Weight (maximum) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.0 lb (1.81 kg)
Power Requirements:
Primary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 V, 400 Hz; 18 Watts nominal,
31 Watts maximum
External Circuit Breaker Rating . . . . . . . . . . . . . . . . . . 1 Amp at 115 V ac
Display Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Liquid Crystal
Mating Connectors:
J1 (41 Pin Version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . M83723/75R2041N
J1 (55 Pin Version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . M83723/75R2255N
Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3ATI Clamp, Marmon NH100499430
or MSP 64311B
Environmental Specifications (DO160B) . . . . . . . . . . . (A2F1)AKXXXXXXAEAEZZZK
(1) Functional Description and Operation
The VSI/TRA has three functions. It continuously displays rate of climb or rate of
descent. Traffic information is displayed and resolution advisory information is
displayed against vertical speed to allow the flight crew to avoid threats.
The vertical speed display is generated from signals applied directly to the indicator.
The VSI/TRA is designed to be used in place of a conventional vertical speed
indicator. Four possible sources exist for vertical speed data including ARINC 429
data, DC analog signals in accordance with ARINC 575 (approximately 500 mV per
1000 ft/min), ac analog signals in accordance with ARINC 565 (approximately 250
mV per 1000 ft/min), and ARINC 429 signals from the ACSS Pressure Transducer
Module. The VSI/TRA computes vertical rate from electrical static pressure when a
remote static sensor is used. These four program pin selectable configurations
provide compatibility with most aircraft.
Bootstrapping of vertical speed inputs as currently implemented on L1011, A300,
A310 and A300600 aircraft, is provided with a larger 55pin unit connector. These
units have a unique dash number assigned to them.
Various dash number VSI/TRA Displays are available that provide unique design
characteristics, which include VSI rate filter programming and selection of an English
or metric rate scale. Table 15 contain a listing of all the VSI/TRA configurations.