User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 3−56
15 Dec 2005
Table 3−10. Strap Assembly Programming Instructions (cont)
Strap
Number
Functional Description
W5 SQUAT SWITCH POLARITY
The Squat Switch Polarity strap is used to indicate the logic or signal sense of the aircraft
squat switch on ground condition. If the squat switch is closed when the aircraft is on the
ground, jumper W5 must be installed (Uncut). If the squat switch is closed when the
aircraft is airborne, jumper W5 must be Open (Cut).
W6
W7
W8
AIRCRAFT MAXIMUM TRUE AIRSPEED RANGE: (B0, B1, B2)
The Aircraft Maximum True Airspeed Range straps are used to define the aircraft’s
maximum airspeed capability. The straps are defined as follows:
Strap Number
W6 W7 W8 Definition
Gnd Gnd Gnd No Data Available
Open Gnd Gnd 75 Knots or Less
Gnd Open Gnd 76 to 150 Knots
Open Open Gnd 151 to 300 Knots
Gnd Gnd Open 301 to 600 Knots
Open Gnd Open 601 to 1200 Knots
Gnd Open Open Over 1200 Knots
Open Open Open Not Assigned
W9 thru W32
(LSB − MSB)
MODE S ADDRESS: (B0 THRU B23)
The Mode S Address is a unique 24−bit code assigned to each aircraft. Straps W9 thru
W32 are used to program this 24−bit binary number. The straps must be set according to
this binary number representation. Each binary 1 represents a Cut strap and each binary
0 represents an Uncut strap. Strap W9 represents the least significant digit of the binary
number and strap W32 represents the most significant digit of the binary number. The
initial board condition with all jumpers is a 0 address.
NOTE: An address of all 0’s or all 1’s is an illegal address, and can cause the aircraft to
be invisible to TCAS II equipped aircraft in flight. Never use an illegal address
for an installed system.
W33
W34
ALTITUDE SOURCE: (B0, B1)
The Altitude Source straps select the type of altitude information used by the transponder.
Altitude information can be generated by an encoding altimeter in the form of Gray aka
Gillham code, or by a digital Air Data Computer. The straps are defined as follows:
Strap Number
W33 W34 Definition
Gnd Gnd Gillham Gray Code Altitude Source
Open Gnd ARINC 429 Altitude Source
Gnd Open ARINC 575 Altitude Source
Open Open RSB Altitude Source
NOTE: The RSB altitude source is a valid selection only when the transponder receives
tuning information from an RCB bus.