R Mod : 3832 or 8259
ATR 42 Model : 400/500
TCAS
COMMUNICATIONS
P 6
NOV 01
060
1.05
.
20
TCAS OPERATING CHARACTERISTICS
S
NON ICING CONDITIONS of inhibition
CONFIGURATION
RA CLIMB
RA INCREASE CLIMB
FLAPS 0
_
FLAPS 15
_
FLAPS 25
_
FLAPS 35
_
AUTHORIZED
AUTHORIZED
AUTHORIZED
AUTHORIZED
AUTHORIZED
INHIBITED
INHIBITED
INHIBITED
S
ICING CONDITIONS of inhibition
CONFIGURATION
RA CLIMB
RA INCREASE CLIMB
FLAPS 0
_
FLAPS 15
_
FLAPS 25
_
FLAPS 35
_
AUTHORIZED
AUTHORIZED
AUTHORIZED
AUTHORIZED
AUTHORIZED
INHIBITED
INHIBITED
INHIBITED
S
The increase climb" RA is inhibited for certain above conditions.
In non altitude crossing encounters for which a CLIMB" RA is posted, the threat may
maneuver or accelerate toward own aircraft and cause a reduction in vertical separation
despite the RA. Since the increase climb" RA is inhibited, the climb RA remains posted.
As soon as the threat passes through own aircraft's altitude, the RA sense will be reversed
and a DESCEND" RA will be posted. If the threat never crosses through, the CLIMB" RA
will remain posted for the duration of the encounter.
S
DESCEND" RA's are inhibited :
- until the aircraft is above 1200 ft AGL on take-off,
- below 1000 ft AGL on approach.
S
INCREASE DESCEND" RA's are inhibited below 1450 ft AGL.
S
All RA's are inhibited :
- below 1100 ft AGL when aircraft is climbing,
- below 900 ft AGL when aircraft is descending.
S
The TCAS surveillance may not function at distances less than 900 ft.
S
There can be a case where the threat aircraft track on altitude information is lost during
an RA. In this case, the RA will terminate without a CLEAR OF CONFLICT"
annunciation.
AA
AviationLearning.net
01/07//2018 REV 1 These notes are not revised after issue For Training Purposes Only
Page 228 of 764