Defining Condition Limits—Exercises
Main Exercise
Purpose: The purpose of this lesson is to learn how to
define condition based maintenance.
Purpose: The purpose of this exercise is to learn how to
register a maintenance plan based on condition monitoring.
The rule says that the landing wheel should be replaced when tyre tread depth is less than 3 millimeters. If
the tread depth is less than 1 millimeter it is critical. Normal tread depth of a new tyre is 20
millimeters. The wheel should also be replaced if tread depth is reduced by more
than 4 millimeters between two consecutive measurements. You need a Tread Depth
Gauge to do the measurement which should be done every 4 weeks.
An instruction for wheel replacement has been registered in a previous lesson,
the operation number
is n032212. An instruction (nX32213) on how to do the tyre tread check, will be
defined in this exercise.
Windows:
Condition Monitoring Program
Instruction
Steps: To complete this exercise, perform the following steps.
- Open the
Condition Monitoring Program window and query (F3) for your wheel,
Part
Number X32WHE7002, Rev n.
- Click the
Condition Limit tab and create a new record (F5).
- Place cursor in the Condition Category field and use the
Zoom
function to create a new Condition Category called nTYRE.
- Use this category, and then specify Condition Code TREAD - Tread
depth.
- Enter Standard Value at 20mm and specify Warning Limit Min. to 3
millimeters and Danger
Limit Min. to 1 millimeter.
- Specify the Change Limit to 4 millimeter and Measure Frequency to 4
weeks.
- Optionally, you can enter additional information
on the condition limit in the Task Remark field. When a task is created for the
interval maintenance, this information will be transferred to the Task Remark
field of the corresponding task record on the maintenance order.
- Save the information (F12).
- Click the
Instructions tab and select Condition Category
nTYRE
and Condition Code TREAD.
- Then you are ready to define the instruction for tread measurement.
- Click the
Operations
tab.
- Create new record (F5) and specify a new operation for the tread depth
measurement. Specify Operation Number n032213 of Type XCHK on
your Wheel Assy revision "n". Specify Location, Strategy
and Competency requirement of a mechanics for 0.2 hours.
- Specify Product Number 7X7 and Model Number X747-90n.
- Specify Function Number 3200, Sub Function 3220 and Bottom Level 3224
(Tyre)
- Double-click on the Work Description field and enter a brief
description on how to measure the tread depth by using a depth gauge. Save
the information (F12).
- Click the
Tools and Facilities tab, create new record (F5) and
specify the Tread Depth Gauge for 0.2 hours. Save the information (F12).
- Then you have to connect the instruction for wheel replacement.
- Open the
Instruction window and query (F3) for Operation
Number n032212.
- Click the
Connect Task Codes tab and then click the
Condition Limit
sub tab and connect this instruction by
specifying Cond Category nTYRE and Cond Code TREAD.
- Save the information (F12).
- Re-open the
Condition Monitoring Program
window and click
the
Instructions
tab.
- Refresh the information and verify that there are 2 operations attached
to this condition measurement, one for doing the measurement and one for
replacing the wheel when limits are exceeded.