GPWC - Generation and Inhibition
Figure 012
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-higher priority messages interrupt lower priority messages.
-
a triggered message is completed even when warning condition ceases.
-
a 0.75 s pause exists between warning messages. The voice warning circuits are inhibited by the priority 1 input (no warn). The priority 1 input is present if the internally generated master valid signal is lost or the momentary audio suppress discrete is present. Should the master valid signal be recovered or the momentary audio suppress discrete be removed, the priority 1 input is cancelled and the previous warning will return (providing the associated warning envelope is still penetrated). Mode 5 GLIDE SLOPE warnings can only be cancelled by pressing the G/S MODE pushbutton switch on the overhead panel 21VU.
E. GPWC Maintenance Output (Ref. Fig. 013) 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.
7. Test
____
The GPWC interruptive self-test facility provides the following test modes:
-airborne self-test
-
ground self-test
-
ground vocabulary test
-
status/history test.
A.
Airborne Self-test
(1)
The airborne self-test is enabled when the following conditions are met:
-radio altitude input is greater than 1000 ft. and valid and airspeed is greater than 90 Kts
-the GPWS/G/S pushbutton switch has been pressed.
(2)
With no system faults present, the GPWC generates the following warning sequence:
(a)
A single soft GLIDE SLOPE aural warning is broadcast.
(b)
A single WHOOP WHOOP PULL UP aural warning is broadcast.
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GPWC - Warning Mode and Maintenance Word Format
Figure 013
R 1EFF : 001-049, 051-060, 101-104, 1 34-48-00Page 39 1 1 Config-2 May 01/05 1 1 1CES 1 B. Ground Self-Test
(1) The ground self-test presents the same test sequence as the airborne test but also includes an internal check. The internal test is enabled by a radio altitude input indicating an altitude below 5 ft., and computed airspeed below 60 Kts. The test is initiated by pressing and holding the GPWS/G/S pushbutton switch for 0.5 seconds.
NOTE : Holding the switch pressed either continuously or during the
____ PULL UP sequence of the ground test will initiate the vocabulary test.
(2) Upon initiation of the test, providing there are no faults present, the sequence will start. Between the first and second sequence steps (soft GLIDE SLOPE and WHOOP WHOOP PULL UP broadcasts) an internal check is made of the following:
-processor instruction set
-program memory contents
-voice memory contents.
The internal clock must not exceed four seconds.
C. Ground Vocabulary Test The ground vocabulary test is initiated if you press the GPWS/G/S pushbutton switch continuously or during the PULL UP portion of the ground test.
NOTE : Fault to observe the above procedure will initiate the ground self
____
test.
The test sequence is as follows:
(1)
Verify that the system status is correct for the ground test (radio altitude < 5 ft., computed airspeed below 60 kts).
(2)
Carry out the internal tests as detailed in the ground self-test.
(3)
Carry out the output sequence of the ground self-test of the GPWC.
(4)
Generate all aural warnings in this sequence:
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ORDER TRIGGER WARNING
1 Sink rate SINK RATE
2 Pull up WHOOP WHOOP PULL UP
3 Terrain TERRAIN
4 Pull up WHOOP WHOOP PULL UP
5 Don't sink DON'T SINK
6 Too low terrain TOO LOW TERRAIN
7 Too low gear TOO LOW GEAR
8 Too low flaps TOO LOW FLAPS
9 Too low terrain TOO LOW TERRAIN
10 Glide slope GLIDE SLOPE
11 Minimums MINIMUMS MINIMUMS
D. Status History Test
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