Why does it cost so much to overhaul an airspeed indicator? Last Updated: 02/20/2008
Overhauling an airspeed indicator is not as simple as you would think. A typical overhaul includes all of the following steps:
Total disassembly and inspection.
Determine and correct the cause of failure.
Ultrasonic cleaning of all jewels, pivots, and gears
Reassemble internal components.
Silk-screen dial and/or range mark
Calibrate the unit to manufacturers and/or FAA specifications
Assemble unit into case.
Verify calibration of final assembly.
Accomplish cosmetic touch-up.
Complete all FAA mandated paperwork and certifications.
The typical time required to overhaul an airspeed indicator can range from 1 hour for a simple unit to over 4 hours for complex units.
Calibration of an airspeed indicator is a complex process. Airspeed is a non-linear function, which must be displayed on a linear dial. There are at minimum seven calibration points that are all interactive with each other.