Ground Proximity Alerts Flashcards
What are GPWS alerts based on?
[5 things - GRABA]
- Glide slope deviation
- RA
- Airspeed
- Barometric Altitude
- A/C Config
“Terrain, Terrain, Pull Up”
20-30 seconds from projected impact
Inhibited by TERRAIN INHIBIT
“Caution Terrain”
40-60 seconds from projected impact
Inhibited by TERRAIN INHIBIT
“Too low terrain”
Descent below unsafe RA while too far from any airport in the database
Inhibited by TERRAIN INHIBIT
“Pull Up”
- Follows “Sink Rate” if excessive descent rate continues or increases
- Follows “Terrain” if excessive terrain closure rate continues and landing gear and/or flaps not in landing configuration
“Don’t sink”
Excessive altitude loss after takeoff or go-around
“Glideslope”
Deviation below GS, volume and repetition rate increases as deviation increases.
(Pushing the BELOW G/S P-INHIBIT light cancels or inhibits the alert below 1000 RA
“Sink Rate”
Excessive descent rate
“Too low, Flaps”
Unsafe terrain clearance at LOW airspeed with flaps not in normal landing position.
Inhibited by FLAP INHIBIT switch
“Too low, gear”
Unsafe terrain clearance at LOW airspeed with landing gear not down
“Too low, terrain”
Unsafe terrain clearance at HIGH airspeed with either landing gear not down OR flaps not in landing position.
“Obstacle, obstacle, pull up”
20-30 seconds from projected impact with obstacle
(Not avail in PLAN mode)
(Inhibit with TERRAIN INHIBIT switch)
“Caution Obstacle”
40-60 seconds from projected impact with obstacle
Not avail in PLAN mode
Terrain Inhibit
GPWS provides a warning when the aircraft IS IN a wind shear when below ________ RA and begins at ______.
1500 RA / rotation
GPWS wind shear warnings are:
- Two tone siren followed by “WINDSHEAR”
- Red “WINDSHEAR” on both attitude indicators
