Aviation Mechanic - General, Airframe, and Powerplant › I. General › Task K. Inspection Concepts and Techniques

AM.I.K.S2

Skill

Use micrometers.

Study note

Get a short, cited explanation of this element written from the FAA handbooks: the core idea, the numbers that matter, common test traps, and a quick self-check.

From the FAA library

Aviation Maintenance Technician Handbook - Powerplant p. 10-11
Chapter 10: Engine Maintenance & Operation › Dimensional Inspection › Piston & Piston Pins
piston is to be reused, or a new piston is to be used, measure the outside of the piston by means of a micrometer. Measurements must be taken in several directions and on the skirt, as well ... clearance between the piston pin and the bore of the piston pin bosses using a telescopic gauge and a micrometer. Use the magnetic particle method to inspect the pin for cracks. Since the pins are often case hardened, cracks show…
Aviation Maintenance Technician Handbook - Powerplant p. 10-11
Chapter 10: Engine Maintenance & Operation › Dimensional Inspection › Valves & Valve Springs
Minor pitting on valve faces can sometimes be removed by grinding. Inspect the valve for stretch and wear using a micrometer or a valve radius gauge. [Figure 10-14] If a micrometer is used, stretch is found as a smaller…
Aviation Maintenance Technician Handbook - General p. 11-23
Chapter 11: Hand Tools & Measuring Devices › Layout and Measuring Tools › Using a Micrometer
readings that would require use of the Vernier scale for accurate readings to ten-thousandths of an inch. Using a Micrometer The micrometer must be handled carefully. If it is dropped, its accuracy may be permanently affected. Continually sliding work ... free to revolve the thimble for adjustment. A variation of the micrometer is the dial indicator, which measures variations in a surface by using an accurately machined probe mechanically-linked to a circular hand whose movement indicates thousandths…