Owner's manual

TCAS II Pilot’s Guide
Effective Date 2/04006-08499-0000 Rev 7
79
ABBREVIATIONS AND DEFINITIONS (CONT’D)
G-force The ratio between a given load and the pull
of gravity. For TCAS purposes, G-forces of
an RA could reach ±.25 above/below 1 G
and increase to approximately ±.35 G dur-
ing an increase or reversal of the original
command.
IDENT SPI pulse added to Mode A replies as
method for ground to identify transponder.
Increase Maneuver An increase maneuver is a change of the
original Resolution Advisory command,
either climb or descent, requiring a greater
rate. The increase maneuver could require
G-forces to reach approximately ±.35 within
2.5 seconds.
Indicated Altitude Altitude shown on the altimeter with baro-
metric correction setting set to local sea
level pressure. Used by the crew below
18,000 feet but not used for TCAS process-
ing.
Intruder Any aircraft that is in the surveillance range
of TCAS.
LRU Line Replaceable Unit. A self-contained
avionics component that can be replaced in
the field.
Mode A Transponder ATCRBS transponder that replies to ATC
interrogations sending identification code
but without giving altitude data.
Mode C Transponder ATCRBS transponder that replies to ATC
interrogations giving identification code or
encoded altitude data.
Mode S Transponder Transponder that replies to ATC interroga-
tions giving an ATCRBS identification code,
encoded altitude and other data fields
including aircraft discrete address.
Appendix