GPWS & EGPWS Flashcards
GPWS
Ground Proximity Warning System
CFIT
Controlled Flight into Terrain
GPWS requires inputs from what?
- Radio altimeter
- Barometric altimeter
- Airspeed/Mach*
- ILS glideslope receiver
- Flap and Landing gear position
- Angle of attack sensor*
- Accelerometer inputs from Inertial Reference System*
*Combined inputs used to detect WINDSHEAR
GPWS outputs are?
Aural, and are usually accompanied by:
- Master Caution or Master Warning
- Text on EFIS
- ‘whoop whoop’ sound
What are some limitations of GPWS?
- Relies on radio altimeter
- Limited to below 2500 feet AGL
- Inaccurate at bank angles > 30°
- Inaccurate at pitch angles > 20°
- Produces some false alarms.
- Some modes can be over-ridden
GPWS is inaccurate at bank angles greater than?
30 degrees
GPWS is inaccurate at pitch angles greater than?
20 degrees
EGPWS
Enhanced Ground Proximity Warning System
TAWS
Terrain Awareness Warning System
What features does an EGPWS have which GPWS does not?
- Terrain database
- Knowledge of current position
What do altitude alerting systems do?
Notify the crew of approaching an assigned level or departure from an assigned level.
An RVSM aircraft has mandatory equipment which includes what?
- two independent primary altimetry systems,
- a Mode C-capable SSR transponder,
- an altitude alert system, and
- an autopilot with height lock.
If any mandatory RVSM equipment fails, what must the pilot do?
Notify ATC and report ‘Negative RVSM’
What does a radar altimeter do?
Transmits radio waves down to the ground and measures the time it takes them to be reflected back up to the aircraft.
Can use a pulse or a continuous wave that measures height above the ground.
What is the advantage of continuous wave RDALT?
More accurate and measure the frequency change using the Doppler effect
