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R  installed). 
R  The Enhanced GPWS provides two external display outputs, each with 
R  independent range-scaling control in the same fashion as a weather 
R  radar on both NDs. Changes of range scaling to one ND do not affect 
R  the other display. Each of these two independent outputs may be used 
R  to drive more than one display. 
R  (a) Enhanced GPWS Input processing and signal selection function. 
R  (Ref. Fig. 016A) 
R  The input processing and signal selection function conditions and 
R  formats aircraft data into proper form for use by the Enhanced 
R  GPWS while insulating the Enhanced GPWS from variations in 
R  aircraft type and configuration. 
R  1 Aircraft data inputs_ 
R  Aircraft position latitude and longitude are required for 
R  terrain awareness operation and are received from the Flight 
R  Management System (FMS). The terrain threat detection and 
R  display processing are automatically disabled in some 
R  particular conditions. This is indicated to the flight crew by 
R  an ECAM memo (TERR STBY). 

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 Enhanced GPWS - Terrain Awareness Functions
 Figure 016

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 Enhanced GPWS - Terrain Awareness Functions
 Figure 016A

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R  (Ref. Fig. 009) 
R  Additionally, aircraft ground track and ground speed data are 
R  received from the IR portion of the ADIRU 1 (IRS). The 
R  aircraft altitude MSL is received from the air data portion of 
R  the ADIRU 1. 
R  When QNH baro setting is selected on FCU, baro correction 
R  altitude (label 204) from ADIRU 1 is used. 
R  When STD baro setting is selected on FCU, standard altitude 
R  (label 203) from ADIRU 1 is used. 
R  When QFE baro setting is selected on FCU (assuming QFE option 
R  activated), the altitude is computed: 
R  - during take off, using standard altitude (label 203) from 
R  ADIRU 1 and landing elevation, 
R  - during approach, using standard altitude (label 203) from 
R  ADIRU 1 and QNH baro correction entered by the crew via the 
R  MCDU. On the MCDU, a prompt comes into view adjacent to the 
R  line key related to QNH information for input when < 180 NM 
R  from destination. 
R  (Ref. Fig. 017) 
R  Other aircraft inputs include aircraft heading (from the 
R  IR), roll attitude (from IR) and flight path angle (Gamma, 
R  derived by the Enhanced GPWC). 
R  Aircraft altitude for the Terrain Awareness functions is 
R  also computed from pressure altitude and SAT received from 
R  the air data portion of the ADIRU, altitude from the Global 
R  Positioning System (if available), and height above ground 
R  provided by the Radio Altimeter (RA). 
R  When GPS parameters are available via a specific 
R  Pin-Program, and from GPIRS, the Enhanced GPWS computes a 
R  Geometric Altitude. 
R  2_  Control Inputs
R  Installations provide discrete terrain display select 
R  pushbutton switches (TERR ON ND) in the cockpit for each 
R  display. These are momentary-action pushbutton switches that 
R  are processed by the Enhanced GPWS input processing and signal 
R  selection block as input to display control logic. 
R  Additionally, for aircraft with predictive windshear radar 
R  capability (if WR/PWS installed), a windshear override boolean 
R  is computed using alert level bits from label 077 on WXR 
R  hazard bus for the display control logic. 
R  (Ref. Fig. 004A) 
R  This boolean allows the Enhanced GPWC to manage priority 
R  between Enhanced GPWC alerts and PWS alerts. The installation 
R  requires input of cockpit-selected range scales provided by 
R  the FCU for each ND. 

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 Enhanced GPWC - Discrete Data Inputs
　
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