1. 542d Combat Sustainment Wing 562d Combat Sustainment Group-Metrology NCSLI Conference 5 – August 2008 Air Force Calibration Interval Analysis of Test, Measurement and Diagnostic Equipment (TMDE) Based on Maintenance Data Collection (MDC) Presented By: Scott Brockway Chief, Automated Applications Flight AFMETCAL 20080805

2. 542D COMBAT SUSTAINMENT WING Overview  Air Force Calibration Interval Analysis Timing and Data Recommended Intervals Engineering Judgment Recent Analysis Results

3. 542D COMBAT SUSTAINMENT WING Air Force Calibration Interval Analysis  Performed twice a year (Apr/Oct) All intervals centrally managed by AFMETCAL  Extracting and collecting data 3 unique AF data systems (70+ locations)  All data is combined in an MS Access database  Data filtered for analysis purposes  Truth table used to determine Pass/Fail Cal Condition Received, Action Taken, Cal Condition Returned  AF Goal – 85% Pass at end of cycle  Initial Calibration Intervals Based on similar items or commercial data – set at 12 months if cannot determine from above

4. 542D COMBAT SUSTAINMENT WING Air Force Calibration Interval Analysis  Determining the recommended calibration interval MDC data broken into 2 groups – Current –calibrated within its current cal interval – Historical – calibrated after current interval up to 5 years TMDE with 20 or more actions in current group are considered (30 or more actions add significance) Formula applied to each group (RP-1 derived) – Rec Cal Int = Cur Cal Int ((ln(.85)/ln(R*)) (where R* = Pass/Tot) Example:

5. 542D COMBAT SUSTAINMENT WING Air Force Calibration Interval Analysis  Making the final calibration interval determination Engineers receive database of recommended changes Responsible Engineer reviews EACH entry – Engineer makes final determination Considerations – Should not more than double or halve an interval – Should not change an interval for 1.5 times its new interval – Should be a multiple of 3 months (unless < 9 months) – Should not change interval out of cycle without supervisor approval  Calibration Interval due dates on Air Force Calibration stickers and certificates Not in conflict with ISO 17025 because all customers are internal customers

6. 542D COMBAT SUSTAINMENT WING Air Force Calibration Interval Analysis  The Air Force manages approx 680,000 pieces of TMDE – Performs approx 570,000 calibration actions per year  The latest calibration interval analysis affected the Air Force workload as follows: 2568 part numbers were reviewed 613 Calibration Intervals were updated 64,672 pieces of TMDE were affected – resulting in a decrease in Air Force calibration workload by 1,818 calibrations per year.

7. 542D COMBAT SUSTAINMENT WING Summary  The Air Force performs 2 separate calibration interval analyses per year covering items supported by the AFMETCAL program  Recommended calibration intervals are determined based on Maintenance Data Collection  Engineering judgment is used to determine the final calibration interval

8. 542D COMBAT SUSTAINMENT WING Discussion/Questions