Table of Contents
Advertisement
Honeywell
The DA-884
Data Acquisition
Unit
based
analog/discrete
to digital
MAINTENANCE
MANUAL
GULFSTREAMIV
(DAU) is a multipurpose microprocessor-
conversion unite The DAUS receive all
engine
parameter
signals,
both
analog
and
discrete,
and
miscellaneous
signals
from
aircraft
sensors.
Each
DAU
is paired
with
an
engine
and
receives signals from only that engine.
In order to preclude the total
loss of engine sensor data, each DAU is configured in a dual manner.
The
duality inherent in each unit includes the following:
. Dual/independent analog input buffers
. Dual/independent A/D converters
. Dual/independent data processing
c Dual/independent output ports
- ASCBA
- ASCB B
. Dual/independent power supplies
With the exception of thermocouple and thermistor type sensors, the DAU
is independent of other users of the engine or aft data which it
receives. The failure or removal of a DAU or the failure of a single
channel in the DAU will not, with the above noted exceptions, affect any
other sensor users. This requirement is dictated by the dispatch
capabilities planned for the Gulfstream IV which require a stand-alone
standby engine instrument display.
Parameters transmitted out of the DAU will be via ASCB A or ASCB B, as
listed in Table 6-7. The data on these buses from a single DAU is
identical, since the A/D conversion and processing of the data are done
independently but in the same manner.
The utilization of the avionics standard communications bus allows the
data to be received directly by several independent system LRUS. These
include but are not confined to the following:
.
Fault Warning Computers (FWC)
Symbol Generators (SG)
Navigation Computers (NZ)
Performance Computers (PZ)
. Automatic Flight Guidance Computers (AFGC)
22-14-00
Page 198.11
Aug 15/91
Use or disclosure
of information
on this page is subject to the restrictions
on the title page of this document.
- Quick Links:
- Spz-8000 System Flow Diagram
Hide quick links:
Advertisement
Table of Contents
