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selected radio altitudes
* Mode 7 - Warning for windshear conditions.
In addition to the GPWS modes 1 through 7, these two additional
functions are used:
* Terrain clearance floor - early descent on approach
* Terrain awareness - display of terrain around the airplane.
Abbreviations and Acronyms
* ADI - attitude display indicator
* ADIRU - air data inertial reference unit
* alt - altitude
* AOA - angle of attack
* approx - approximately
* BITE - built-in test equipment
* capt - captain
* DEU - display electronics unit
* DFCS - digital flight control system
* FDAU - flight data acquisition unit
* FMC - flight management computer
* F/O - first officer
* FPM - feet per minute
* FPS - feet per second
* GND PROX - ground proximity
* GPS - global positioning system
* GPWC - ground proximity warning computer
* GPWM - ground proximity warning module
* GPWS - ground proximity warning system
* G/S - glideslope
* ILS - instrument landing system
* inop - inoperative
* IVS - inertial vertical speed
* LED - light emitting diode
* LRU - line replaceable unit
GROUND PROXIMITY WARNING SYSTEM - INTRODUCTION
EFFECTIVITY
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* MCP - mode control panel
* mod - module
* ND - navigation display
* ovrd - override
* P - press
* PFD - primary flight display
* pos - position
* PSEU - proximity switch electronic unit
* PWS - predictive windshear
* RA - radio altitude
* REU - remote electronics unit
* sec - second
* sw - switch
* sys - system
* TA - terrain awareness
* TCAS - traffic alert and collision avoidance system
* TCF - terrain clearance floor
* TERR - terrain
* WXR - weather radar system
* vert - vertical
* xfr - transfer
* xmtr - transmitter
GROUND PROXIMITY WARNING SYSTEM - INTRODUCTION
EFFECTIVITY
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GROUND PROXIMITY WARNING SYSTEM - INTRODUCTION
GROUND PROXIMITY WARNING SYSTEM - INTRODUCTION
EFFECTIVITY
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General Description
The GPWS gives the pilots aural and visual warnings of unsafe
conditions. The warnings continue until the pilots correct the
condition. The system operates when the airplane is less than
2450 feet above the ground.
The enhanced GPWS function contains a worldwide terrain data
base. The GPWC compares airplane position and track with this
data base to find if there is a warning condition. This is the
terrain awareness (TA) function.
The enhanced GPWS also contains an airport data base. This
data base contains terrain information for all hard surface
runways that are more than 3500 feet or longer. The GPWC
compares airplane position and runway location to find if there
is a warning condition. This is the terrain clearance floor (TCF)
function.
The GPWS uses inputs from these units to calculate warning
conditions:
* Ground proximity warning module (GPWM)
* Radio altimeter (RA)
* Air data inertial reference system (ADIRS)
* Stall management yaw dampers (SMYDs)
* Multi-mode receivers (MMRs)
* Flight management computer system (FMCS)
* DFCS MCP
* Weather radar (WXR)
* Display electronics units (DEUs).
GPWS visual warnings show on the common display system
(CDS) display units, the below glideslope annunciators, and the
GPWM.
GPWS aural warnings go through the remote electronics unit to
the pilots headsets and flight deck speakers.
The GPWS sends inhibit signals to the TCAS and weather radar
systems when GPWS calculates cautions and warnings.
The GPWS shows terrain that is forward of the airplane. This
information goes to the terrain/weather relays and then to the
DEUs for display. Alerts to the flight crew of an early descent
during a landing go directly to the DEUs for display.
Visual indications show on these:
* Captain and first officer primary flight displays
* Captain and first officer navigation displays
* Captain and first officer glideslope inhibit switches
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