Malfunctions
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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?

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Malfunctions

Malfunctions

They drive everything!

Written and presented by: Jacqui Chapman


Introduction

Introduction

The number and complexity of malfunctions are the cornerstone to the depth of simulation required.

WATS 2009


The question

The Question

  • Why is it different from operator training?

  • What is the function of maintainer training?

WATS 2009


Operator vs maintainer training

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.

WATS 2009


Training

Training

Form, Fit, Feel, Fidelity and Function

  • Form – shape of..

  • Fit – well suited

  • Feel – ascertain by touch

  • Fidelity – precision in reproduction

  • Function – mode of activity by which a thing fulfils its purpose

  • Malfunction requirements will help drive the final solution

WATS 2009


Maintenance tasks

Maintenance Tasks

  • Scheduled Maintenance

  • Malfunction Diagnosis

  • Malfunction Rectification

WATS 2009


Level of maintenance

Level of Maintenance

  • Confirm that there is a malfunction and isolate

  • Interpretation of monitoring data

  • Identify the component that has malfunctioned

WATS 2009


Malfunction simulation

Malfunction Simulation

  • Confirmation of Failure

WATS 2009


Malfunction simulation1

Malfunction Simulation

  • Interpretationof Health and Usage Monitoring System

WATS 2009


Malfunction simulation2

Malfunction Simulation

  • Use of test equipment, failure flow charts

WATS 2009


Procedural vs free play

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

WATS 2009


Malfunctions

WATS 2009


Confirmation of failure

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

ELSE IF fault applied THEN

Pressure Indicators = 0 psi

Trigger the CWS

Flying Controls, Landing Gear & Brakes do not respond

END IF

Confirmation of Failure

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

WATS 2009


Interpretation of hums

Interpretation of HUMS

If HUMS connected and switched on then

HUMS unit = ON

Freeplay

Switching off systems

Disconnecting connectors

Incorrect selection of HUMS unit

Failures in other system impacting original system

  • 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 …

WATS 2009


Use of test equipment

Use of Test Equipment

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

WATS 2009


One solution

One Solution

  • Object Orientated Design

    • All components emulated

      Get propagation automatically

WATS 2009


Malfunctions

WATS 2009


Simulate vs emulate

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.

WATS 2009


Malfunctions

WATS 2009


Conclusion

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

WATS 2009


Malfunctions1

Malfunctions

They drive everything

[email protected]

www.pennantplc.co.uk

WATS 2009


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