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Calendar Threshold 

[[2 Columned Table]]

|Noted Calendar Threshold | Phase-In Inspection Schedule for Items Exceeding Calendar Threshold|
| --- | --- |
|2 years | Within 1 year from Dec. 1, 1984|
|3 years | Within 1-1/2 years from Dec. 1, 1984|
|4 years | Within 2 years from Dec. 1, 1984|

Flight Threshold 

[[2 Columned Table]]

|Noted Flight Threshold | Phase-in Inspection Schedule for Items Exceeding Flight Threshold|
|---| --- |
| 1 | 1 flight |
| 2 | 1 flight |
| 4 | 2 flights|
| 8 | 4 flights|
| X |X/2 flights|

3. Scheduled Maintenance

a. Intent: The intent of the maintenance inspection plan is to establish maintenance programs for certain Orbiter components/installations for which no OMRSD FILE II, Vol. 3 time/cycle requirements exist. Component general condition is determined by sampling inspections, overhaul findings, rigging, and functional checks. 

b. Sampling Inspection: This concept is utilized to provide the most economical method of monitoring component condition for usage (i.e., wear) or age-related deterioration (i.e., corrosion). It requires tracking by component flights rather then vehicle flights. Therefore, when determining vehicle effectivity, read component flights and component installation time in place of vehicle flights and vehicle time. 

c. Sampling Inspection Method: One or more of the selected high flight/time components will be removed from the Orbiter at the specified flight/time (i.e., 30 flights or 6 years, whichever comes first) for transfer to logistics for inspection/disassembly/overhaul per IDMRD requirements. The logistics inspection will determine if the component is capable of continued satisfactory service. 

d. Sample Inspection Fails: If the inspection results reveal signs of distress, a complete inspection/refurbishment of all identical components will be scheduled prior to the specified flight/time (i.e., 25 flights or 5 years, depending upon the controlling figure used). This would establish a finite overhaul period. 

e. Sample Inspection Passes: If the inspection results reveal that the component was capable of continued satisfactory service, the next sampling inspection would be performed on the first component in the fleet to reach the next higher flight/sample time (i.e., 40

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