TM 55-1510-220-10
Figure 2-1. General Exterior Arrangement (Sheet 3 of 6)
6). The switch, placarded STALL WARN TEST OFF
LDG GEAR WARN TEST, will sound the landing gear
warning horn and illuminate the landing gear position
warning lights when moved to the momentary LDG
GEAR WARN TEST position. The circuit is protected
by a 5-ampere circuit breaker, placarded LANDING
GEAR WARN, on the overhead circuit breaker panel
(fig. 2-27).
g.
Landing Gear Safety Switches. A safety switch
on each main landing gear shock strut controls the
operation of various aircraft systems that function only
during flight or only during ground operation. These
switches are mechanically actuated whenever the main
landing gear
shock struts are extended (normally after takeoff), or
compressed (normally after landing). The safety switch
on the right main landing gear strut activates the landing
gear control circuits, cabin pressurization circuits and
the flight hour meter when the strut is extended. This
switch also activates a down-lock hook, preventing the
landing gear from being raised while the aircraft is on
the ground. The hook, which unlocks automatically after
takeoff, can be manually overridden by pressing down
on the red button, placarded DN LOCK REL located
adjacent to the landing gear switch. If the override is
used and / the landing gear control switch is raised,
power will be supplied to the warning horn circuit and
the horn will sound. The safety switch on the left main
landing gear strut activates the left and
2-4
