PIPER SENECA II SERVICE MANUAL
01/01/09 VII - LANDING GEAR AND BRAKE SYSTEM
1K25
7-39. ADJUSTMENT OF LANDING GEAR UP/POWER REDUCED WARNING SWITCH.
The adjustment of this switch will require flying the airplane at 1000 feet AGL and at approach speed.
(Refer to the Pilot’s Operating Manual.) The following procedure should be used:
a. With the aid of a qualified pilot, fly the airplane to an elevation of 1000 feet above the ground and
come to approach speed with propellers set for high RPM. Retard the throttles to 14 ± 2 inches of
manifold pressure and mark the quadrant cover adjacent to the throttle levers, in such a manner so
that the levers can be returned to the same position after the airplane is landed and the engines shut
down.
b. Place the airplane on jacks (refer to Section II of this manual) and retract the landing gear.
c. Reposition the throttle levers at the location which gave the 14 ± 2 inches of manifold pressure per
Step a.
d. With the master switch turned on, loosen the two mounting screws securing the micro switch to the
bracket. Move the switch in the direction necessary to make the warning horn operate and tighten
the mounting screws.
e. With the warning horn operating, lower the landing gear to determine whether the horn ceases to
operate when the gear are down and locked. Turn OFF master switch and remove airplane from
jacks.
f. Flight test the airplane to ensure proper operation of the gear warning horn with the gear up and
power reduced below 14± 2 inches of manifold pressure.
7-40. REPLACEMENT OF LANDING GEAR UP/POWER REDUCED WARNING SWITCH.
(Refer to Figure 7-11.)
When replacing the switch, it is important to determine how many washers are positioned between the
micro switch and the bracket so that an equal amount are reinstalled. This is necessary since the switch,
when properly positioned, should be in the middle of the actuators located on each throttle cable.
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