Replacing an aircraft's tach meter or Hobbs meter
This tutorial shows you how to handle instances where an aircraft's tach meter or Hobbs meter is replaced.
Entering an adjustment record
- Go to Aircraft -> Aircraft Logbook. Click Add Entry.
- In the Basic section, enter the date and aircraft ID of the meter replacement.
- Select Maintenance from the Category drop-down.
- From the Meter Replacement field in the Times section, select either New Tach Meter or New Hobbs Meter as appropriate.
- Enter the final reading of the old meter in the applicable field.
- Enter the initial reading of the new meter (which may be 0.0) in either the Engine Tach field or Hobbs time field, as appropriate.
- Click "Save Record".
How it works
ZuluLog assumes there is zero aircraft time between the final reading of the old meter, and the initial reading of the new meter. Therefore, the system will use the difference between the two as an "offset" when calculating the total time of components and maintenance schedules.
Let's assume that:
- Engine #1 on N1234 has a 400 tach hour inspection schedule. The inspection was last completed on Nov 1, 2014, at 1233.0 tach hours.
- On Mar 15, 2015 the tach meter was replaced. The final reading of the old meter was 1300.0 and the initial reading of the new meter was 10.0.
- The latest tach reading on the aircraft is 50.0 as of today.
Here's how the system calculates the time remaining until the engine's next 400-hour inspection:
Hours_since_inspection = Previous_inspection_to_meter_reset + Meter_reset_to_current
or, in our example,
Hours_since_inspection = (1300.0 - 1233.0) + (50.0 - 10.0)
Hours_since_inspection = 67 + 40 = 107.
Hours_remaining = 400 - 107 = 293
Tach_reading_at_expiration = Current_reading + Hours_remaining = 50.0 + 293.0 = 343.0
Therefore, the engine's next 400-hour inspection will be due at a meter reading of 343.0, which is 293.0 hours from now. You can view the results of these calculations on the pop-up panel from Aircraft/Component Status, or from the Aircraft/Component Status PDF reports.