TM 1-1510-225-10
2-24
Figure 2-6. Circuit Breaker Panel F3 ANG (Sheet 5 of 5)
e. Landing Gear Warning System. The
landing gear warning system is provided to warn the
pilot that the landing gear is not down and locked
during specific flight regimes. Various warning modes
result, depending upon the position of the flaps.
With flaps in the UP or APPROACH positions
and either or both POWER levers retarded below
approximately 80% N1, the warning horn will sound
and the landing gear switch handle indicator lights will
illuminate. Silence the horn by pressing the
WARNING HORN SILENCE switch, located on the left
POWER lever. However, the lights in the landing gear
switch handle cannot be canceled. The gear warning
silence switch is a magnetically held switch. Once
actuated it will stay in the UP position until both
POWER levers are advanced above 86% N1. The
landing gear warning system will be rearmed if both
POWER levers are advanced above 86% N1.
With the landing gear retracted and flaps beyond
the APPROACH position, the warning horn and
landing gear switch handle lights will be activated
regardless of the power setting. The horn cannot be
silenced in this case, until either the landing gear is
lowered or the flaps are retracted to the UP or
APPROACH position.
f. 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 deactivates the landing gear control circuits,
cabin pressurization circuits, and the flight hour meter
when the shock strut is compressed. This switch also
activates a downlock 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 handle on the pilot's
subpanel. If the override is used, the landing gear
warning horn will sound intermittently and two parallel-
wired red indicator lights, located in the landing gear
