Piper Cherokee LANCE, Service Manual

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PIPER CHEROKEE SIX / LANCE SERVICE MANUAL
07/15/06 VIA - LANDING GEAR AND BRAKE SYSTEM
(PA-32R-300)
2D21
6A-31. ADJUSTMENT OF NOSE GEAR UP LIMIT SWITCH. The gear up limit switch is mounted on a
bracket above the point where the right side of the upper drag link attaches to the engine mount. (Refer
to Figure 6A-10.)
a. To facilitate adjustment of the limit switch, disconnect the gear doors or remove the bottom cowl, as
desired.
b. Retract the landing gear hydro-electrically by turning the master switch on, raising the emergency
gear extension lever and moving the gear selector handle to the up position. Retain the emergency
extension lever in the up position and turn the master switch off.
c. Block the nose gear in the up position and then slowly release the emergency extension lever. This
will relieve hydraulic pressure and the main gears will drop.
d. Rig the nose gear up limit switch so that the switch activates when the nose gear is within .12 of an
inch of full up travel per rigging instructions given in paragraph 6A-12.
e. Loosen the lower attachment screw of the switch bracket and rotate the switch toward the actuator
tang until it is heard to actuate. Retighten the bracket attachment screw of the switch.
f. Manually move the gear up and down only as far as necessary to ascertain that the switch actuates
at the correct position. Remove the block from under the gear and allow it to slowly extend.
g. Retract the gear hydro-electrically and ascertain that the red gear unsafe light will go out when the
gear has retracted and the pump has shut off.
6A-32. ADJUSTMENT OF NOSE GEAR DOWN LIMIT SWITCH. The gear down limit switch is mounted
on the horizontal support tube of the engine mount that runs between the right attachment points of the
gear housing and upper drag link.
a. Ascertain that the gear is down and locked.
b. The down limit switch should actuate only after the leading edge of the downlock hook, when
moving to the locked position, has passed the downlock roller by .06 of an inch. (Refer to Figure
6A-10.) Position the hook at this location in relation to the roller by moving the actuator piston
manually toward the up position. The downlock spring may be disconnected, if desired.
c. Loosen lower attachment screw of the switch mounting bracket and move bracket toward the
downlock hook until it is heard to actuate. Retighten the bracket attachment screw.
d. Manually move the hook from the locked to the unlocked position and ascertain that the switch
actuates at the correct location of the hook.
e. Retract and extend the gear hydro-electrically by turning the master switch on, raising the
emergency gear extension lever and moving the gear selector handle to the up position. As the gear
begins to retract the green light below the selector should go out and the red gear unsafe light at the
top of the instrument panel should come on.
6A-33. ADJUSTMENT OF MAIN GEAR UP LIMIT SWITCH. A gear up limit switch is located in each
wheel well above the gear door hinge. There is no adjustment of these switches other than checking that
the gear, when retracting, will actuate the switch within .88 of an inch ot full up. Switch operation turns
the red gear unsafe light out.