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| H484 SERIES |
The Howell Instruments' microprocessor-based
engine monitors combine accuracy and
dependability with multi-channel monitoring
capability. Engine management with
state-of-the-art technology enhances fleet
operations and safety, while reducing
operating costs.
In addition to allowing the operator to view
engine and airframe parameters in real time,
the unit can be programmed to display data in
any of the following modes.
- Identification and Usage Data
- Exceedance Monitoring
- Trend Monitoring
- Flight Profile Data
Display
The digital display includes one, thirty (30)
character line of green alphanumeric
characters.
Data Access Connector
The Data Access Connector is provided for
uploading and downloading data.
Exceedance Monitoring
The H484 can monitor selected parameters for
out-of-limit conditions. The engine
manufacturer's operating limits are
programmed into the unit, which tracks engine
operation in real time under operational
conditions. When an exceedance is detected, a
latching ball flag on the face of the unit is
set, informing maintenance personnel that an
out-of-limit event has occurred. The unit
also has the capability of providing an
output signal to a cockpit Advisory/Warning
Panel. The H484 normally records the date and
time of the event, a frame (or frames) of all
parameters pertinent to the event, the
duration of the exceedance, the peak value of
the offending parameter and, if applicable,
the level of maintenance required based upon
the severity of the event.
Flight Profile Data
Flight profile data can be collected in a
Timed Recording Mode or a Profile All Mode.
The Timed Recording Mode collects a frame of
data at a selectable fixed time interval. The
Profile All Mode collects start and shutdown
records at a rate of one per second. All
other operational data is gathered using data
compression techniques to minimize the space
of data collected.
Data Reduction
A menu-driven ground station software package
helps operators reduce flight data using an
IBM compatible PC. Data file management is
straightforward, easy to interpret, and it
provides storage for data records.
Input Signals
Four cards are dedicated to the processing of
input signals.
- The frequency card can monitor up to
five frequency inputs. The frequency range
is 3.5 Hz to 30 KHz.
- The low level analog card is capable of
monitoring two thermocouples and two
RTDs.
- The high level analog card can monitor
three high level DC analog signals.
- The discrete card monitors up to six
discrete inputs. These discrete inputs can
be voltage or ground. This card also has
the capability of outputting two 28 VDC@1
Amp discrete signals that are software
programmable.
Expansion
Expansion card slot number 1 is addressable
and is capable of accommodating any of the
cards listed above as well as cards of
special design.
Expansion card slot number 2 is addressable
and is capable of monitoring four dedicated
signals such as synchro and pulse
displacement fuel flow meters. This expansion
slot also has the capability of interfacing
with ARINC 429, MIL STD 1553, and RS 232 data
busses. This capability allows the H384 to
interface with:
- Howell Automatic Engine Data
Acquisition System (AEDATS)
- Howell JETCAL2000® Analyzer
- Aircraft Air Data Computers
- Personal Computers
- Air Frame Data Buss
Vibration measurement capability is also
available as an option.
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