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* Body normal acceleration
* Inertial vertical acceleration
* Pitch rate
* Ground speed
* True track
* True heading
* IR mode.
This IR data is used to determine cautions and warnings for
GPWS modes 1, 2, 3, 7, terrain clearance floor (TCF), and terrain
awareness (TA). The GPWC uses the data from from the left
ADIRU. If the left ADIRU data is invalid, it uses data from the
right ADIRU.
Radio Altimeter Receiver-Transmitter
The radio altimeters (RA) send radio altitude data to the GPWC.
This data is used in modes 1 to 7 and TCF. The GPWC uses the
data from from RA 1. If RA 1 data is invalid, it uses data from RA
2.
GPWS - DIGITAL INTERFACES
EFFECTIVITY
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Instrument Landing System
SHZ 001-003
The ILS receiver in MMR 1 sends localizer and glideslope
deviation data to the GPWC. Localizer deviation data is used in
the envelope modulation function. Glideslope deviation data is
used in mode 5 and the envelope modulation function.
SHZ 009-999
The ILS receiver in both MMRs send localizer and glideslope
deviation data to the GPWC. Localizer deviation data is used in
the envelope modulation function. Glideslope deviation data is
used in mode 5 and the envelope modulation function. The
GPWC uses the ILS data from from MMR 1. If MMR 1 data is
invalid, it uses ILS data from MMR 2.
SHZ ALL
Global Position System
The GPS in the MMRs sends this data to the GPWC:
* Latitude (coarse)
* Longitude (coarse)
* Latitude (fine)
* Longitude (fine)
* Ground speed
* True track.
* Altitude
* Vertical velocity
* Horizontal dilution of precision (HDOP)
* Vertical dilution of precision (VDOP)
* Horizontal figure of merit (HFOM)
* Vertical figure of merit (VFOM)
* Date
* Time (UTC)
* Horizontal integrity limit (HIL)
* Sensor status.
The GPWC uses the GPS data from from MMR 1. If MMR 1 data
is invalid, it uses GPS data from MMR 2.
Latitude and longitude (coarse and fine) information gives
airplane position for the TCF and TA functions.
Ground speed, true track, altitude, and vertical velocity are used
in the TA function.
Horizontal dilution of precision, vertical dilution of precision,
horizontal figure of merit, and vertical figure of merit data is
used for airplane position accuracy calculations.
Date and time information is used in the fault monitor process,
which labels each fault with the date and time of occurrence.
The horizontal integrity limit is used to determine the current
integrity limit and GPS non-isolatable satellite failures.
GPWS - DIGITAL INTERFACES
EFFECTIVITY
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-46-00-006
Sensor status lets the GPWC monitor the status of the GPS
receiver IN THE MMR.
Flight Management Computer System
The FMC sends latitude, longitude, and magnetic track data to
the GPWC. The GPWC uses this data in the envelope
modulation function. If the FMC input is invalid, the GPWC
uses latitude, longitude and magnetic track data from the
ADIRS.
DFCS MCP
The digital flight control system (DFCS) mode control panel
(MCP) sends selected course data to the GPWC. This data is
used in mode 5 and the envelope modulation function.
Stall Management Yaw Damper
The stall management yaw dampers (SMYD) send this data to
the GPWC:
* Indicated angle of attack (AOA)
* Corrected AOA
* Stick shaker AOA
* Flap position
* Minimum operating speed.
The inputs from the SMYD are used primarily in wind shear
calculations.
DEUs
The display electronic units (DEUs) send this data from the EFIS
control panels to the GPWC:
* Range
* Terrain select
* Radio minimums
* Baro minimums.
Weather Radar Receiver-Transmitter
The weather radar RT sends predictive windshear caution and
warning data to the GPWC. The GPWC contains aural
prioritization logic that uses this data to determine which
system cautions and warnings to inhibit. The GPWS, TCAS, and
PWS systems are prioritized by the GPWC.
GPWC Outputs
The GPWC sends system status, caution, and warning data on
an ARINC 429 data bus to the DEUs. The DEUs show system
status, caution and warning annunciations on the captain and
　
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