SAP MTBR & MTTR - Maintenance



SAP MTBR & MTTR

Background:

1. SAP can provide Mean Time To Repair (MMTR), and Mean Time Between Repairs (MTBR) metrics.

2. The key to obtaining valid results is (as normal) valid input.

3. However, there are also some special situations and requirements that should be known.

Input Required:

1. Malfunction Data must be provided on a Notification.

a. Any of the Notification types (M1, M2, M3) can be used.

2. All of the Malfunction Data must be provided on each Notification

a. Malfunction Start Date

b. Malfunction End Date

c. Breakdown Indicator must be selected

d. Breakdown Duration

e. [pic]

f. Breakdown Time will be calculated automatically from the Start and End Date and Time if you hit Enter [pic].

Number Of Breakdowns Calculation:

1. Notifications for the same Technical Object with overlapping Malfunction Start and End Dates and Times are counted a single Breakdown.

Breakdown Duration Calculation:

1. Notifications for the same Technical Object with overlapping Malfunction Start and End Dates and Times have special processing as represented in this picture:

a. [pic]

MTTR:

1. Breakdown Duration (1+…+n) / Number of Breakdowns

2. Example

a. First breakdown 10 hours

b. Second breakdown 5 hours

c. Number of breakdowns 2

d. MTTR = 10 +5 / 2 = 7.5 hours

MTBR:

1. ((Start Time of Breakdown n – Start Time of Breakdown n-1 ) – Breakdown Duration n-1) / Number of Breakdowns

2. Example

a. Start-up date of pump A 01.01.94

b. First breakdown 10.01.94

c. Downtime 10 hours

d. Second breakdown 20.01.94

e. Downtime 5 hours

f. Number of breakdowns 2

g. MTBR = (19 * 24 - 10) / 2 or X + Y (hr) / 2

h. = (456 - 10) / 2 or (216 + 240 - 10) / 2

i. = 223 hours

Start Up Date:

1. Start-Up Date on the General Tab of an Equipment Record is used to determine when the equipment began service.

2. [pic]

3. A missing Start-Up Date forces the calculation to determine the beginning service date from the End Date of the first malfunction.

a. The first malfunction is not taken into account when it is used to determine the beginning of service.

b. Malfunctions that overlap the first malfunction are not included in the Breakdown Counts, Durations, or Time Between calculations.

c. Recording a Start-Up Date after Breakdowns are entered correctly reverts the calculations after the next Breakdown Notification is entered

4. Time 00:00:00 is used for the beginning of service time.

5. It is recommended that Start-Up Date be set on all Equipment and Functional Locations in order to obtain clear results from the MTBR calculation.

Running The Breakdown Analysis Report (MCI7):

1. The Functional Location selection criteria can only be used to find Notifications that only have a Functional Location as the Reference Object.

2. A Functional Location selection criteria will not find Notifications that include Equipment as a Reference Object.

3. The Equipment selection criteria must be used to find Notifications that include Equipment as a Reference Object.

References:

1. OSS Note 80311

2. SAP Library Help article “Key Figures for Breakdown Statistics”

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