Piper PA-34-200T Seneca II, Service Manual

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PIPER SENECA II SERVICE MANUAL
04/30/07 VII - LANDING GEAR AND BRAKE SYSTEM
1K23
7-32. ADJUSTMENT OF NOSE GEAR DOWN LIMIT SWITCH. (Refer to Figure 7-9.) The nose gear
down limit switch is mounted on a bracket located on the forward side of the cabin bulkhead.
a. With landing gear in the retracted position, pull the free-fall valve knob permitting the gear to
extend.
b. Check to determine that the downlock spring (1) returns the body end of the actuating cylinder
(2)
aft.
c. Ascertain that the downlock link assembly (3) is fully retracted and that the drag link arms (4) are
over center.
d. In this position, the nose gear green downlock light should energize when the master switch is
turned on and the gear selector lever is in the down position.
e. If the nose gear green downlock light does not energize, loosen the attachment screws of the switch
and rotate the switch toward the actuator tang until it is heard to actuate. Tighten the adjustment
screws.
7-33. ADJUSTMENT OF MAIN GEAR UP LIMIT SWITCH. A gear up limit switch is located in each
wheel well above the gear door hinge. The red “GEAR UNSAFE” light is extinguished when all three
gears have actuated their up limit switches and the gear selector is in the up position.
7-34. ADJUSTMENT OF MAIN GEAR DOWN LIMIT SWITCH. The gear down limit switch is mounted
on a bracket attached to the lower drag link of each main gear. The switch should be adjusted to allow it
to actuate when the downlock hook has entered the locked position and is within .025 to .035 inch of
contacting the pin thus turning the green light on in the cockpit. (Refer to Figure 7-10.) Adjustment, if
necessary, should be made as follows:
a. Determine that the main gear downlock is properly adjusted as described in Paragraph 7-24.
b. Raise the airplane on jacks.
c. Determine that the landing gear is down and pressure is relieved from the hydraulic system. To
relieve pressure, pull the free-fall knob out.
d. Raise the downlock hook assembly and place a .030 inch feeler gauge between the horizontal
surface of the hook that is next to the switch (the surface that contacts the downlock pin) and the
rounded surface of the pin. Lower the hook and allow it to rest on the feeler gauge.
e. Loosen the attaching screws of the switch and, while pushing up on center of the link assembly,
rotate the switch toward the hook until it is heard to actuate. Retighten the attaching screws of the
switch.
f. Manually move the hook assembly up from the pin until the hook nearly disengages from the pin.
Then with pressure against the bottom of the link assembly, move back to determine that the switch
actuates within .025 to .035 inch of full lock.
g. Turn the master switch on and raise and lower the landing gear by means of the gear selector switch
to determine the gear downlock and gear unsafe annunciator lights function properly.