Honeywell CAS-100 Maintenance Manual page 43

Collision avoidance system
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Table 1. TCAS System Components (Honeywell Supplied) (cont)
Equipment Type
RA/VSI (Resolution Advisory/Vertical Speed Indicator)
IVA-81B
NOTE 4.
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
MAINTENANCE MANUAL
CAS-100 COLLISION AVOIDANCE SYSTEM
Honeywell
Part Number
066-50002
Description
The indicator is a front-panel attached,
electro-mechanical display unit. The unit displays
vertical speed with a stationary vertical speed scale.
A moving electromechanical scale displays vertical
maneuvering advisories (RAs) with curved lamp
segments around the edge of the vertical speed
scale (does not give a display of adjacent intruder
traffic). The vertical speed display operates from
pneumatic or air data electrical input. The display
receives RA and TCAS mode data on a high-speed
ARINC 429 bus from the TPA-100A TCAS
processor.
Built-in-test continuously monitors for missing
primary power, internal IVA-81B failures, altitude
rate input failures, and supplies a discrete display
valid status signal to the TCAS processor.
The IVA-81B receives 115 V, 400 Hz primary power
and 5 V ac or dc panel lighting power from the
aircraft power sources. The IVA-81B requires a ±12
V reference input if a ARINC 575 altitude rate input
is used or a 26 V ac reference input if a ARINC 565
analog altitude rate input is used.
34-45-47
Page 9
1 Dec 2003

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