R **ON A/C 106-149, 220-299, 301-399, 401-499,
R R (6) Autotilt capability The automatic tilt angle capability uses aircraft altitude above the terrain and terrain elevations in the area to generate a tilt angle for the weather radar system. This automatic tilt angle setting causes minimum ground clutter to be displayed while maintaining the optimum weather detection capability. With manual tilt control, there is a possibility of: - overscan where the weather cells and the terrain are below the antenna beam scan and in this case, the display is blank, or - underscan where the antenna scan basically hits the ground below the weather cells and in this case, the display only shows the ground clutter. The calculated tilt angle is transmitted to the weather radar system via an ARINC 429 output bus on labels 061, 062, 063, 064 and 065. The Enhanced GPWS computes a tilt angle for each sector based on underlying terrain elevations. There are two tilt angles: a Short Range Tilt (SRT) angle and a Long Range Tilt (LRT) angle. The SRT angle covers 95 per cent of the ground below the aircraft within 80 NM from the aircraft. The LRT angle covers 90 per cent of the ground below the aircraft within 160 NM from the aircraft. The terrain database is divided into five short-range sectors and five long- range sectors in a semi-circle in front of the aircraft. (Ref. Fig. 029)
R R **ON A/C 001-049, 051-099, 101-102, 106-149, 201-202, 211-299, 301-399, 401-499,
F. Enhanced GPWC Maintenance Output A maintenance output signal (label 270 octal) is provided by the ARINC 429 transmitter. The transmitter converts the microprocessor parallel data to standard serial data for the DMU of the AIDS.
**ON A/C ALL
Post SB 34-1193 For A/C 001-049,051-060,101-104,
8. Test____
Enhanced GPWS - Autotilt Capability R Figure 029
R 1EFF : 106-149, 220-299, 301-399, 401-499, 1 34-48-00Page A73 1 1 Config-1 Aug 01/05 1 1 1CES 1 **ON A/C 106-149, 215-299, 301-399,
A. Self-Tests
(1)
On the ground only, the Enhanced GPWC provides self-test capability, providing an indication of the ability of the Enhanced GPWC to perform its intended function.
(2)
The Enhanced GPWC self-test is initiated by momentarily pressing PULL UP/GPWS pushbutton switches or activated via the MCDU on the ground. When activated by pressing the PULL UP/GPWS pushbutton switches, the self-test is enunciated, via the same audio system as the Enhanced GPWS alerts. This self-test can also be accessed via the headphone jack on the front panel of the Enhanced GPWC and it has been divided into six different levels to help with Enhanced GPWC testing and troubleshooting.
(a) Level 1 Level 1, functional testing, provides an overview of the current operational functions selected and provides an indication of their operational status. Level 1 self-test sequence:
-
the FAULT legend of the GPWS/SYS pushbutton switch is on,
-
the FAULT legend of the GPWS/TERR pushbutton switch is on,
-GPWS legends of both PULL UP/GPWS pushbutton switches are on,
-GLIDE SLOPE audio phase is broadcast,
-GPWS legends of both PULL UP/GPWS pushbutton switches go off,
-
PULL UP legends of both PULL UP/GPWS pushbutton switches are on,
-
PULL UP audio phase is broadcast,
-TERRAIN AHEAD PULL UP audio phase is broadcast,
-PULL UP legends of both PULL UP/GPWS pushbutton switches go off,
-ON legends of both TERR ON ND pushbutton switches are on,
-terrain self-test pattern is displayed on both NDs, R (Ref. Fig. 030A)
-vocabulary sequence when long self-test initiated:
R 1EFF : 106-149, 215-299, 301-399, 1 34-48-00Page A74 1 1 Config-1 Aug 01/05 1 1 1CES 1R Enhanced GPWS - Test Pattern R Figure 030
R 1EFF : 401-499, 1 34-48-00Page A75 1 1 Config-1 Aug 01/05 1 1 1CES 1
Enhanced GPWS - Test Pattern R Figure 030A
R 1EFF : 001-049, 051-099, 101-149, 151-199, 1 34-48-00Page A76 1201-299, 301-399, 1Config-1 Aug 01/05 1 1 1CES 1
SINK RATE PULL UP TERRAIN PULL UP
DON'T SINK
DON'T SINK
TOO LOW TERRAIN TOO LOW GEAR TOO LOW FLAPS
TOO LOW TERRAIN
GLIDE SLOPE
TOO LOW TERRAIN
TERRAIN AHEAD
TERRAIN AHEAD
TERRAIN AHEAD PULL UP
-terrain self-test pattern turns off,
-ON legends of both TERR ON ND pushbutton switches and the images displayed on both NDs revert to the configuration selected before the test,
-
the FAULT legend of the GPWS/SYS pushbutton switch goes off,
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