Malfunctions  They drive everything! Written and presented by: Jacqui Chapman

 Introduction  The Question  One Solution  Emulating Malfunctions  Data  Conclusion 29 th April 2009WATS 20092

Introduction The number and complexity of malfunctions are the cornerstone to the depth of simulation required. 29 th April 20093WATS 2009

The Question  Why is it different from operator training?  What is the function of maintainer training? 29 th April 2009WATS 20094

Operator vs. Maintainer Training Cause and Effect  Where 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. 29 th April 2009WATS 20095

Training Form, Fit, Feel, Fidelity and Function FForm – shape of.. FFit – well suited FFeel – ascertain by touch FFidelity – precision in reproduction FFunction – mode of activity by which a thing fulfils its purpose MMalfunction requirements will help drive the final solution 29 th April 2009WATS 20096

Maintenance Tasks  Scheduled Maintenance  Malfunction Diagnosis  Malfunction Rectification 29 th April 2009WATS 20097

Level of Maintenance 1)Confirm that there is a malfunction and isolate 2)Interpretation of monitoring data 3)Identify the component that has malfunctioned 29 th April 2009WATS 20098

Malfunction Simulation 1)Confirmation of Failure 29 th April 2009WATS 20099

Malfunction Simulation 2)Interpretation of Health and Usage Monitoring System 29 th April 2009WATS

Malfunction Simulation 3)Use of test equipment, failure flow charts 29 th April 2009WATS

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 29 th April 2009WATS

29 th April 2009WATS

Confirmation of Failure 29 th April 2009WATS 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 IFEND ELSE IF fault applied THEN Pressure Indicators = 0 psi Trigger the CWS Flying Controls, Landing Gear & Brakes do not respond END IF

Interpretation of HUMS If HUMS connected and switched on then HUMS unit = ON  Procedural If no fault applied then If HUMS O/P = then System response HUMS display Else if fault a then If HUMS O/P = then System response HUMS display …  Freeplay Switching off systems Disconnecting connectors Incorrect selection of HUMS unit Failures in other system impacting original system 29 th April 2009WATS

Use of Test Equipment 29 th April 2009WATS If STTE connected and switched on then STTE unit = ON  Procedural If no fault applied then If STTE O/P = then System response STTE display Else if fault a then If STTE O/P = then System response STTE 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 29 th April 2009WATS

29 th April 2009WATS

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. 29 th April 2009WATS

29 th April 2009WATS

Data  Emulation/Simulation is only as good as the data that goes to build it –Develop from technical data –Use real equipment software Develop a good working relationship with the data provider 29 th April 2009WATS

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 29 th April 2009WATS

Malfunctions  They drive everything   th April 2009WATS