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The initial provisioning list is based
on assumptions of fleet operating
parameters, and reliability rates and
removal intervals of all components. This
list then has to be constantly refined by
using the reliability data of the parts
gained by the reliability analysis
capability of various M&E IT systems.
“AuRA will take into account removal
intervals, as well as repair and transit
times so that excessive inventory is not
held. This process gets refined with
operational experience of the fleet. It will
also take into account the utilisation of
the aircraft, with data coming from the
airline operations module of the system,”
says Hughes. “The constant reassessment
of the inventory also has to consider the
upgrading of part dash numbers and fleet
upgrades.”
Besides provisioning estimates and
their refinement, airlines then also have to
consider claiming warranties from
OEMs. Under traditional paper systems it
was almost impossible for a typical
airline inventory management team to
check for remaining warranties on every
part removed during line maintenance.
Warranty information on each part is
loaded when each serial number is loaded
into the system. “This involves the
integration of component purchasing and
tracking. As each part is acquired, VISaer
allows its warranty information, relating
to the time in which a warranty can be
claimed, to be loaded,” explains Bruch.
“Warranties are therefore followed
automatically with accumulated FH and
FC utilisation, since the warranty time
remaining for any part can be looked
up.”
When parts are removed their
AIRCRAFT COMMERCE ISSUE NO. 36 • AUGUST/SEPTEMBER 2004
32 I MAINTENANCE & ENGINEERING
Jouve’s AirGTI creates hyperlinks between OEMs’
manuals that include the illustrated parts
catalogue, aircraft maintenance manual and
fault isolation manual.
remaining warranty time can be
examined, and checked against warranty
contract parameters. Warranty claims can
thus be analysed and made automatically.
Health monitoring
Health monitoring is a process carried
out by engine manufacturers to assist
with the planning and management of
engine maintenance. Engine health
monitoring has traditionally been carried
out by airline engineering departments,
and parameters recorded manually in
flight were passed by flight crews to
engineering departments for analysis.
This traditional system recorded few
parameters and involved manual
interpretation, and so was limited in its
ability to accurately predict the
deterioration in engine performance and
need for removal for a shop visit or
maintenance.
All major engine OEMs have
developed sophisticated engine health
monitoring products to go with their
engine maintenance and support services.
Rolls-Royce (RR) provides total care and
non-total care engine support packages,
and DS&S provides engine health
monitoring services to go with these.
Core Alert is DS&S’s engine health
monitoring service. RR keeps a database
of all engines it manages. The data kept
include information on engine utilisation,
flight hour (FH): flight cycle ratios, style
and environment of operation, life and
remaining lives of life limited parts and
exhaust gas temperature (EGT) margin.
These data are used to allow decisions to
be made with respect to engine
management and the timing of
maintenance events. RR has a 24/7
customer support desk, which is used to
capture performance data and provides
engineering expertise to interpret it.
Aircraft in flight send engine performance
and parameter data via ACARS for shortand
long-term engine health monitoring.
RR’s 24/7 desk provides the short-term
health monitoring service.
RR provides customers with technical
support by putting engines that are
displaying technical problems ‘on watch’.
It also makes suggestions for short-term
maintenance and technical fixes, as well
as making suggestions to alter engine
removal plans. Also to be added is a
service where customer airlines will be
given suggestions for line maintenance to
be performed to deal with in service
problems.
Health monitoring data are then
passed to DS&S, which uses the data
from a large number of parameters to
analyse engine performance and make
long-term decisions with respect to
maintenance management.
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