Aviation Mechanic - General, Airframe, and Powerplant › II. Airframe › Task H. Aircraft Instrument Systems

AM.II.H.K12

Knowledge

Instrument range markings.

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 - Airframe p. 10-79
Chapter 10: Aircraft Systems › Instrument Installations & Markings › Instrument Range Markings
Instrument Range Markings Many instruments contain colored markings on the dial face to indicate, at a glance, whether a particular system or component is within a range of operation that is safe and desirable or if an undesirable condition exists ... marking will no longer be aligned properly with the calibrated instrument dial. The broken slippage mark indicates this to the pilot or technician. The colors used as range markings are red, yellow, green, blue, or white. The markings…
Aviation Maintenance Technician Handbook - Airframe p. 10-80
Chapter 10: Aircraft Systems › Maintenance of Instruments & Instrument Systems
know what maintenance is required and to access the approved procedures for meeting those requirements. Figure 10-136. Instrument range markings. In the following paragraphs, various maintenance and servicing procedures and suggestions are given. The discussion follows the order…
Aviation Maintenance Technician Handbook - Powerplant p. 10-21
Chapter 10: Engine Maintenance & Operation › Installation & Testing › Engine Instruments
Torquemeter. Instrument markings, ranges of operation, minimum and maximum limits, and the interpretation of these markings are general ... instruments. Generally, the instrument marking system consists of three colors: red, yellow, and green. A red line, or mark, indicates a point beyond which a dangerous operating condition exists. A red arc indicates a dangerous operating range due generally…