technology today 2005 issue 4 - Raytheon

Hawker 4000 Mission Assurance:
Integrating Reliability, Maintainability,
System Safety and Supportability (RMSS)
into the Concurrent Engineering Process
Underlying Business Trends
In General Aviation
Global competition within general aviation
is dictating that reducing the operating cost
of our products is paramount to our success.
It is no longer acceptable for a design
to only achieve its aerodynamic performance
requirements; the design must also be
operational and supportable at a competitive
cost. Market movement is toward
guaranteed maintenance plans (GMP) with
significant penalties for non-performance
becoming essential to aircraft sales.
HAWKER 4000 Initiative To
Meet New Business Trends
Objective: To develop the capability within
the Hawker 4000 design team to introduce
and sustain a fully operational and supportable
airplane that meets customer objectives,
including aerodynamic performance,
reliability, maintainability, system safety and
supportability at a competitive cost.
Result: A Customer-Driven
Product
Aircraft owners today are looking for an
effective business tool as opposed to just
an executive conveyance. Many fly at utilization
rates approaching that of airlines.
On the Hawker 4000, the focus is on reliability,
maintainability, system safety, and
supportability (RMSS) design attributes that
provide a safe, reliable, and supportable
design in this competitive marketplace. Our
focus on quality RMSS technical performance
is integrated into every phase of the
design process. RMSS representation on all
design integrated product teams (IPTs) has
influenced the design to meet technical
12 2005 ISSUE 4 RAYTHEON TECHNOLOGY TODAY
performance requirements (market needs)
while being optimized for supportability
and reliability.
Customer satisfaction has been maximized
and partnerships achieved by incorporating
customer feedback acquired from the
Hawker 4000 Maintenance Advisory Team
(MAT). The MAT was assembled to provide
field experience input into the early design
process.
RMSS Attributes
Key RMSS design goals and attributes associated
with the Hawker 4000 include the
following:
Outstanding dispatch reliability
Operational availability of missionessential
equipment
Low maintenance man-hours/flight hour
Minimum time to repair. The Hawker
4000 incorporates many features that
focus on maintenance, readiness, and
Mission Assurance (getting the job done
on schedule). Some examples include:
– The Hawker 4000 will be certified for
both on-condition and fixed-interval
maintenance. By eliminating unnecessary
inspections, we optimize readiness
rates, minimize life cycle cost
(LCC), and sustain the appropriate levels
of inherent reliability and safety of
the equipment. The minimum routine
inspection interval for the Hawker
4000 is 600 flight hours.
– Line-replaceable units (LRUs) and linereplaceable
modules (LRMs) provide
for easy access, removal and replacement
and minimize both inventory
and maintenance downtime. Easy
accessibility is particularly important
for mission critical items, 98 percent
of which meet the requirement of
“one deep.”
– The Hawker 4000 uses electronic diagnostic
technology that provides a
built-in test (BIT) capability that detects
99 percent of mission-affecting failures
and fault isolates 98.5 percent of
those failures to a single LRU/LRM
with no removals required for diagnostic
purposes. This technology minimizes
maintenance downtime and
repeated “No Fault Found” cycles to
reduce the maintenance man-hours/
flight hour (MMH/FH).
– The Central Maintenance Computer
(CMC) provides technicians with a single
interface to most aircraft systems.
The CMC is accessed through a cockpit
multi-function display (MFD) or
alternatively through an external laptop
PC. BIT-detected failures are displayed
in “plain English” and aircraft
maintenance manual procedures
linked via CD-ROM can be viewed. A
full electronic maintenance library is
available on CD-ROM. The CMC also
provides the interface to an electronic
display for control system rigging.
– The Hawker 4000 avionics equipment
is easily accessed and located inside
the pressure vessel (a controlled environment)
allowing for improved reliability,
reduced maintenance downtime
and improved readiness.