- The colored marks on aircraft instruments that indicate the ranges of operation of that system as specified in manufacturers’ manuals. The ranges and colors most often used arei. A red radial line, which means, “Do not exceed the parameter beyond this.”ii. A green arc, indicating the normal operating range.iii. A yellow arc, which indicates the caution zone.iv. A blue radial line, which is used only in an ASI (air-speed indicator), shows the best single-engine-rate-of-climb speed.v. A white arc, which also is used only in an ASI, shows the flap-operating speed.Range marking on an air speed indicator.
Aviation dictionary. 2014.
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