If Hobbs Times have been entered accidentally in FOS you are able to clear them from the Times Tab in FOS by following the steps below.  

1. Open the Flight Log where the hobbs times were entered by mistake or incorrectly.  

2. Amend the Flight Log and clear or adjust the hobbs times that have been entered. Click OK to save the record.  

3. Open the Aircraft Record and navigate to the AC Log.  

4. Select the most recent user entered log entry (in some cases there may only be one user created logbook entry that was made when initially using FOS). 

5. Click on the Recalculate A/C Log button.

7. Navigate to the Times Tab and click on the Recalc Button. The Hobbs Times will now be either cleared or reflected correctly.