TRAX MANUALS > Engineering > Engineering Module - E/C > Engineering E/C, Update Menu > Engineering Control > Engineering Control, Schedule Tab > Part Number Engineering Control Actuals Calculations

Part Number Engineering Control (P/N E/C) Actuals calculations are based on different scenarios as the Actuals are not coming from any particular P/N Control for the part. The Created Date, Effective Date and Install Date combinations explicitly determine what the P/N E/C's Actuals will reflect in the planning window. This becomes especially important with newly created retroactive P/N E/Cs. The following topics will cover all of the possible scenarios and demonstrate the results:

• Scenario 1: P/N E/C Created prior to Serial Number being brought into TRAX
• Scenario 2: P/N E/C created while the P/N S/N is currently installed on an Aircraft
• Scenario 3: P/N E/C created after the P/N S/N is Installed/Removed multiple times from various Aircraft but its Effectivity predates the P/N being Installed/Removed

Note: In Trax Version 12.5, the Calendar Days drop down has replaced the Calendar Days checkbox. The Calendar Days drop down appears regardless of the Planning Switch PN_EC_INSTDAYS setting, however the available drop down options are dependent upon if the switch is set to Yes or No. When Calendar Days is set to Yes, the planning forecast will account for and track:
1. Off-wing days, between installations and removals; and
2. Manually entered days that represent historical time accruals.

Note: In TRAX Version 11, the Calendar Days checkbox has replaced the P/N E/C Use E/C Effective Date checkbox. The Calendar Days checkbox is only available if Planning Switch PN_EC_INSTDAYS is set to Yes.

For more information, refer to Switch P/N_E/C_INSTDAYS via the Planning Switches Training Manual.

For more information on this change of functionality between TRAX Version X, Version 11, and Version 12.5, refer to P/N E/C Calendar Days Planning via the Engineering - E/C Training Manual.