User's Manual Part 1

CAS / Part No. 9000000

SYSTEM DESCRIPTION AND INSTALLATION MANUAL

34-43-20

15 Feb 2003

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1--46

Table 1--9. VSI/TRA Leading Particulars

Item Specification

Dimensions (maximum):

• Height ....................................... 3.26 in. (82.8 mm)

• Width ........................................ 3.26 in. (82.8 mm)

• Length ....................................... 7.5 in. (190.0 mm)

Weight (maximum) .............................. 3.3lb(1.5kg)

Power Requirements:

• Primary ...................................... 115 V, 400 Hz; 17 Watts nominal (Day),

12 Watts nominal (Night),

20 Watts maximum

• ExternalCircuitBreakerRating.................. 1Ampat115Vac

DisplayType.................................... Liquid Crystal

Mating Connectors:

• J1(41Pin) ................................... M83723/72R--20--41--6

Mounting ....................................... 3--ATI Clamp, Marmon NH1004994--30

or MSP 64311B

(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 informa tion 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.

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 1--5 contains a listing of all the VSI/TRA configurations.