R Mod : 3832 or 8259
ATR 42 Model : 400/500
TCAS
LIMITATIONS
P 2
NOV 01
050
2.01
.
06
TCAS (cont'd)
7-Because of the limited number of inputs to TCAS for determination of aircraft
performance inhibits, there are instances where inhibiting RAs would be
appropriate, however it is not possible to do so. In these cases, TCAS may command
maneuvers which may significantly reduce stall margins or result in stall warning.
Conditions where this may occur include operations with a bank angle (wings level is
assumed), weight, altitude and temperature combinations outside those noted
below, leaving aircraft in landing configuration during climb RA on approach, engine
out operations, and abnormal configurations such as landing gear not retracted or
stick pusher/shaker failure.
The table below entitled Flight Envelope in which climb resolution advisory can be
accomplished without stick pusher/shaker activation" outlines the parameters used
in the development of the performance inhibits. This table does not consider worst
turboprop flight conditions especially operations using minimum operating
airspeeds as are sometimes required (e.g. obstacle clearance, ATC constraints). In
all cases, stall warning must be given precedence over climb RA commands.
NOTE
:
TCAS is viewed as a supplement to the pilot who, with the aid of the
ATC system, has the primary responsibility for avoiding mid-air
collisions.
WARNING
: Priority must be granted to increasing airspeed when reaching stall
warning even when this requires deviation from an RA command
issued by the TCAS.
AA
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