Radar & TCAS Flashcards
Why is it a multiscan radar?
There are two sweeps, an upper and a lower. The upper detects short range weather and the lower, long range weather.
How does the windshear warning system work?
Doppler effect of moisture ahead of the aircraft allows the radar to predict windshear ahead.
When MAN is selected how can the crew adjust radar tilt?
Tilt knob
What does the GCS mode do?
Ground Clutter Suppression, eliminates ground returns, allowing for lower tilt angles than normal.
What are the 4 radar modes?
WX Weather only
WX+T Weather + Turbulence
TURB Turbulence only
MAP Ground Mapping
When MULTISCAN switch is set to AUTO, what should the gain be set to?
+8
When manually setting the tilt angle, what happens with when not in level flight?
The Tilt angle is reference to the horizon. So any pitch or roll will not affect the radar return.
What is the PWS switch?
Predictive Wind Shear system
What does MAGENTA represent on the ND radar screen? What is the range of this detection?
Turbulence, 40 NM
How is the radar scan changed during approach?
Scan is 90 degrees until below 2300, then it is reduced to 60 degrees.
Windshear is detected 30 degrees either side up to 5 NM. But range must be set to 10 NM for windshear to be displayed.
What is the criteria for Predictive Windshear Alerts?
PWS switch…ON
ALT…below 1500
Engine…running
Transponder…NOT in STBY
RADAR does NOT have to be ON
How can you terminate radar emissions?
PWS…OFF
SYS…OFF
Transponder…STBY
When are windshear alerts inhibited?
Below 50 AGL
On TO after passing 100 kts through 50 AGL
What is the range of detection?
30-40 NM
+/- 9900 feet
What are the 4 types of traffic alerts?
Other - no threat
Proximate - no threat within 6NM and 1200’
Traffic Advisory - Close but no collision (TCPA 40sec)
Resolution Advisory - Collision Threat (TCPA 25sec)
