A320飞机维护手册 AMM NAVIGATION 导航4(24)_航空信息_民用航空_通用航空

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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.