malfunctions
DESCRIPTION
Malfunctions. They drive everything! Written and presented by: Jacqui Chapman. Introduction. The number and complexity of malfunctions are the cornerstone to the depth of simulation required. The Question. Why is it different from operator training? - PowerPoint PPT PresentationTRANSCRIPT
Malfunctions
They drive everything!
Written and presented by: Jacqui Chapman
Introduction
The number and complexity of malfunctions are the cornerstone to the depth of
simulation required.
29th April 2009 3WATS 2009
The Question
Why is it different from operator training?What is the function of maintainer training?
29th April 2009 WATS 2009 4
Operator vs. Maintainer Training
Cause and EffectWhere the emphasis is on the effects of a
malfunction and it is how an operator reacts to it that is all important
Where the cause of the malfunction is what a maintainer is trying to discover,
using the effect as part of a fault diagnosis procedure.
29th April 2009 WATS 2009 5
Training
Form, Fit, Feel, Fidelity and FunctionForm – shape of..Fit – well suitedFeel – ascertain by touchFidelity – precision in reproductionFunction – mode of activity by which a thing
fulfils its purposeMalfunction requirements will help drive
the final solution
29th April 2009 WATS 2009 6
Maintenance Tasks
Scheduled MaintenanceMalfunction Diagnosis
Malfunction Rectification
29th April 2009 WATS 2009 7
Level of Maintenance
1) Confirm that there is a malfunction and isolate
2) Interpretation of monitoring data3) Identify the component that has
malfunctioned
29th April 2009 WATS 2009 8
Malfunction Simulation1) Confirmation of Failure
29th April 2009 WATS 2009 9
Malfunction Simulation2) Interpretation of Health and Usage Monitoring System
29th April 2009 WATS 2009 10
Malfunction Simulation3) Use of test equipment, failure flow charts
29th April 2009 WATS 2009 11
Procedural vs. ‘Free Play’
Fault Propagation– Does the simulation need to display
secondary effects?Diagnosis and Rectification
– Does the simulation need to react to deviation?
• No – procedural• Yes – Free play
29th April 2009 WATS 2009 12
29th April 2009 WATS 2009 13
Confirmation of Failure
29th April 2009 WATS 2009 14
IF Engine > x rpm AND Power > 24V dc THEN
Pressure Indicators = 3000 psi
No Trigger to CWS
Flying Controls, Landing Gear & Brakes respond correctly
IFEND
IF Engine > x rpm AND Power > 24V dc AND no fault applied THEN
Pressure Indicators = 3000 psi
No Trigger to CWS
Flying Controls, Landing Gear & Brakes respond correctly
IFENDELSE IF fault applied THEN
Pressure Indicators = 0 psi
Trigger the CWS
Flying Controls, Landing Gear & Brakes do not respond
END IF
Interpretation of HUMSIf HUMS connected and switched on then
HUMS unit = ON
ProceduralIf no fault applied then
If HUMS O/P = thenSystem responseHUMS displayElse if fault a then If HUMS O/P = thenSystem responseHUMS display …
Freeplay
• Switching off systems• Disconnecting connectors• Incorrect selection of
HUMS unit• Failures in other system
impacting original system
29th April 2009 WATS 2009 15
Use of Test Equipment
29th April 2009 WATS 2009 16
If STTE connected and switched on thenSTTE unit = ON
ProceduralIf no fault applied then
If STTE O/P = thenSystem responseSTTE display
Else if fault a then If STTE O/P =
thenSystem responseSTTE display …
Freeplay
• Switching off systems• Disconnecting connectors• Incorrect selection of
HUMS unit• Failures in other system
impacting original system
One Solution
Object Orientated Design
– All components emulated
Get propagation automatically
29th April 2009 WATS 2009 17
29th April 2009 WATS 2009 18
Simulate vs. Emulate
Simulate is to have the appearance, form, feel and function of…
Emulate is to attempt to equal functionality without necessarily providing form and feel.
29th April 2009 WATS 2009 19
29th April 2009 WATS 2009 20
Conclusion
Understand the level of malfunction coverage required
Understand what the maintainer is being trained to do in reaction to a malfunction
Form, Fit, Feel, Fidelity and Function
29th April 2009 WATS 2009 22
