User guide

006-18301-0000 Rev 0Effective Date 7/04

ABBREVIATIONS AND DEFINITIONS (CONT’D)

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.

Pressure Altitude Indicated altitude when barometric pressure

is set to 29.92” Hg. (1013mb).

Rad Alt Radio Altitude.

Self Test A functional test that determines equipment

status. Self test differs from BITE perfor-

mance monitoring because it is initiated by

the crew and is not performed continually or

automatically.

Appendix