User's Manual

SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
344323
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Page 414
15 Dec 2005
Table 41. TCAS 3000 Computer Unit Loading/Gradient Specifications (cont)
Connector Pin
Designation
Functional Description
RBP5A Advisory Inhibit Discrete Input No. 1 (NO)
Four discrete inputs at RBP5A, 5B, 5C, and 5D provide the capability for the TCAS
computer unit to defer all advisory (TA), aural alert and visual alert outputs until another,
higher priority announcement or alert is completed. An open at all four of these discrete
inputs indicates normal advisory/alert operation. These discrete inputs become active by
connection to program common (ground) at RBP7K. No new TA information can be
placed on the RA or RA/TA busses during a period of Advisory Inhibit. If an advisory
condition, which occurred during a period of Advisory Inhibit, remains when the TCAS
computer unit returns to normal operation, it is annunciated. The Advisory Inhibit inputs
and their effect on the advisory/alert priority system are as follows:
Discrete No. Pin No. Mode Priority
1 RBP5A Forced Standby 1
2 RBP5B Force TA Only (no voice/tone) 2
3 RBP5C Force TA Only (no voice/tone) 2
4 RBP5D Force TA Only (no voice/tone) 2
Discrete No. 1 (RBP5A) has priority over No. 2 (RBP5B), No. 3 (RBP5C) and No. 4
(RBP5D). Discrete No. 1 forces TCAS into STANDBY mode. Discretes No. 2, No. 3,
and No. 4 force TCAS into TA mode with no voice or tone annunciations.
RBP5B Advisory Inhibit Discrete Input No. 2 (NO)
See RBP5A.
RBP5C Advisory Inhibit Discrete Input No. 3 (NO)
See RBP5A.
RBP5D Advisory Inhibit Discrete Input No. 4 (NO)
See RBP5A.
RBP5E Increase Climb Inhibit Discrete Input No. 1 (NO)
This input is a ground/open type discrete used to provide information to the TCAS CU
whether to assume that the aircraft cannot achieve a climb rate of 2500 feet per minute
(FPM). The climb inhibit discrete inputs are designed in pairs (No. 1 and No. 2 at
RBP5F, or No. 3 at RBP5G and No. 4 at RBP5H) but can be wired as a single input
or in conjunction with other aircraft operations to achieve airframe customization of the
climb inhibit feature. The 2500 FPM climb inhibit function is assumed whenever No. 1
and No. 2 are ground or No. 3 and No. 4 are ground.
RBP5F Increase Climb Inhibit Discrete Input No. 2 (NO)
See RBP5E.
RBP5G Increase Climb Inhibit Discrete Input No. 3 (NO)
See RBP5E.
RBP5H Increase Climb Inhibit Discrete Input No. 4 (NO)
See RBP5E.
RBP5J Climb Inhibit Discrete Input No. 3 (NO)
See RMP1J.