188.8.131.52 Color. Except where NVIS compatibility is
required, the color of the caution signals shall be aviation yellow. Where
NVIS compatibility is required, the color of the caution signals shall be in
accordance with MIL-L-85762.
184.108.40.206 Legend. When illuminated, the legend shall be
translucent on an opaque background as shown on figure 1. The character
height of the legend shall subtend a viewing angle of not less than 20
minutes of arc when measured from the aft most point of the design eye line
(see 3.7). Character proportions
shall be in accordance with MIL-M-18012. The minimum horizontal separation
between two legends shall be two times the width of the widest character.
The minimum vertical separation between two legends shall be two character
heights. The minimum vertical separation between two lines in the same
legend shall be one-half the height of a character.
220.127.116.11 Luminance. The luminance of the light signals
shall be not less than 150 fL when the signals are operated at rated voltage
at the point of entry of the light source. No less than two lamps, operating
in parallel, shall be employed for each incandescent and light emitting
diode type legend caution light. When installed in the flight aircrew
station, the master caution signal shall be dimmed to 15 ± 3 fL and the
caution signals shall be automatically reduced to 1.0 ± 0.50 fL when the
pilot's primary interior light control is "ON". Caution signals shall be
capable of being dimmed to a luminance of 0.1 fL when NVIS compatibility is
required. The design shall preclude inadvertent dimming during daylight
conditions. When installed in other aircrew stations, the caution signals
shall automatically be dimmed to 15 ± 3 fL when the operator's primary panel
light control is "ON". Except when NVIS are being used within a crew
station, the dimmed caution signals shall be automatically reset to full
bright when any of the following conditions exist:
a. Main aircraft power is turned off.
b. Pilot’s primary light control is off.
c. High intensity lights are energized.
When an NVIS compatible lighting mode is being used
within a crew station, the lighting circuit logic shall preclude the system
from obtaining a luminance level which will degrade external vision or NVIS
18.104.22.168 Presentation. The master caution signal shall
have a steady "ON" light presentation unless a flashing presentation is
approved by the acquiring activity (see 6.3.1). All other caution
signals shall have a steady "ON" light presentation.
22.214.171.124 Master caution signal reset. The master caution
signal shall have a push-to-reset or voice reset capability which
deenergizes the master caution signal while the applicable caution signal