TM 55-1510-220-10
Figure 2-1. General Exterior Arrangement (Sheet 1 of 6)
GEAR RELAY on the overhead circuit breaker panel
(fig. 2-27).
b.
Landing Gear Down Position-Indicator Lights.
Landing gear down position is indicated by three green
lights on the left subpanel, placarded GEAR DOWN.
These lights may be checked by operating the
ANNUNCIATOR TEST switch. The circuit is protected
by a 5-ampere circuit breaker, placarded LANDING
GEAR IND, on the overhead circuit breaker panel (fig.2-
27).
c.
Landing Gear Position Warning Lights. Two red
bulbs, wired in parallel and activated by microswitches
independent of the GEAR
DOWN position indicator annunciators, are positioned
inside the clear plastic grip on the landing gear control
switch. These annunciators illuminate whenever the
landing gear switch is in either the UP or DN position
and the gear is in transit. Both bulbs will also illuminate
should either or both power levers be retarded below
approximately 79 to 81% N1 when the landing gear is
not down and locked. To turn the switch annunciators
OFF during single engine operation, the power lever for
the inoperative engine must be advanced to a position
which is higher than the setting of the warning horn
microswitch. Extending the landing gear will also turn
the annunciators off, provided the gear is down and
locked. Both red annunciators indicate the same
warning conditions, but two are provided for a fail-safe
indication in the event one bulb burns out. The
Change 2 2-2
