This document provides instructions for using the Plant Maintenance End User Manual to generate reports on Mean Time to Repair (MTTR) and Mean Time Between Repair (MTBR). It explains how to access the report using transaction code MCJB, select equipment, and view breakdown statistics including number of breakdowns, downtime length, MTTR, and MTBR. MTTR is calculated by dividing total breakdown time by number of breakdowns. MTBR is calculated by subtracting breakdown times from the total time between acquisitions and dividing by the number of breakdowns. The report also shows the number of actual machine breakdowns versus the number of reported breakdowns.

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End User Manual
Plant Maintenance
General Information
 Plant Maintenance End User Manual
 MTTR/MTBR Report
Author  Janaka Pathmendra
Date Last Updated  JUNE 2014

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Plant Maintenance Report MTTR/MTBR
Transaction code –MCJB
Mean Time to Repair (MTTR) and Mean Time Between Repair (MTBR).
This is a useful Report, The key figure values are reading directly from the notification database. In this
way, it is possible to obtain detailed information on a breakdown for each period, for example, the
notification number or the start/end of the malfunction.
In addition, the key figures "number of breakdowns reported'" and "total downtime" are displayed in the
standard analyses, the "number of actual breakdowns" is displayed, which is for example not the same as
the "number of breakdowns reported"
Enter the MCJB T-code ,then you can see this interface.
If you know the Equipment, you can enter the Equipment number and execute.
For example if you want Banbury 01 MTTR/MTBR Data.

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Enter the Equipment number and execute.
If not you can select the get variant button then there are display created list .you can select the line item.
As an example CKITL MIX has selected & you can see,

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For each technical object entered in the selection screen per period in the breakdown, you obtain the
following data:
o Number of breakdowns
o Length of downtime
o Mean Time to Repair
o Mean Time between Repair
The average duration of a machine breakdown, MTTR (Mean Time To Repair), is calculated from the
individual history of a piece of equipment. This gives the following formula:
MTTR= Length of breakdown /Numbers of breakdown
MTTR=Total breakdown time 15Hours in month /two break downs in month
MTTR=15H/2
MTTR is 7.5
The key figure MTBR is calculated in hours.
The following example shows how the MTBR is calculated:
Acquisition date of Banbury 01- 01.01.2014
First breakdown 10.01.2014
Downtime 10 hours
Second breakdown 20.01.2014

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Downtime 5 hours
Number of breakdowns 2
20.01.2014 - 01.01.2014 =19Day
Hours=19 x 24 =456 Hours
First Break down time is 10Hours
MTBR = (19 * 24 - 10) / 2
= (456 - 10) / 2
= 223 hours

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In this link, have any more data, Function location, Equipment, Reported by, Malfunction start
date & time, Malfunction end date, time & Breakdown duration etc.
Note-When you create the notification you must set the breakdown tick for calculate the
MTTR/MTBR & Breakdown report.

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We distinguish between the following:
 Number of machine breakdowns reported
 Number of actual machine breakdowns
The reported breakdowns are important from a business point of view, whereas the actual
breakdowns are of interest from a technical viewpoint.
For Example when Banbury 01 Dump mill already breakdown & at that time, Banbury 01 came
breakdown. There are two-machine breakdown reported. However, there is a one actual machine
breakdown.
By using the breakdown statistics you can analyze the causes of a particular breakdown more
closely. The focus in this case is on the distribution of duration of the various breakdowns or
repairs, and on how these were caused. The aim of these analyses is to find out the cause behind a
short or long breakdown period, or the period between two consecutive breakdowns. An indicator
in the first screen of the notification indicates that a malfunction report or a maintenance request
contains a machine breakdown.