Piper PA-32R-301T SARATOGA S Maintenance Manual Download

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GENERAL

This section contains instructions for the overhaul, inspection, and adjustment of the various components

of the landing gear and brake systems; adjustments for the electrical limit, safety and warning systems.

With the exception of brakes, this section does not cover the hydraulic function of the landing gear.

This information may be found in the hydraulic section, chapter 29.

DESCRIPTION AND OPERATION

The PA-32R-301/301T is equipped with a retractable tricycle air-oil strut type landing gear which is

hydraulically operated by an electrically powered reversible pump. A selector handle on the instrument

panel to the left of the control quadrant is used to select gear up or down positions.
Gear positions are indicated by three green lights located above the selector lever for gear down and

locked position. A red light located at the top of the instrument panel indicates gear unsafe condition.

There is no indications that the landing gear has fully retracted other than all lights are out. When the

landing gear moves to the down position and each downlock hook moves into its locked position, a

limit switch is actuated to its normally closed (NC) condition. This will illuminate a green light

indicating that the individual gear is safely down and locked. The activation of all three downlock

switches will also shut off the hydraulic pump. As the instrument lights are turned on, the green lights

will dim. When the gear begins to retract and the downlock hook disengages, the down limit switch

actuates to the (NC) position and is in series with the (NC) circuit of the up limit switch allowing the

gear unsafe light to come on. The gear unsafe light will remain on until the gear is up and all up limit

switches are actuated to their normally open (NO) position.
The red gear unsafe light also operates simultaneously with the warning horn. Both serve a dual pur-

pose. Their primary purpose is to give warning when power is reduced below approximately 14 inches

of manifold pressure and the landing gear has not reached the down and locked position. This circuit is

controlled by the three paralleling down limit switches connected in series with the throttle switch. The

secondary function of the warning light and horn is to give warning when the gear selector handle is

up while the airplane is on the ground or airspeed is below that required to close the hydraulic valve

and the pump switch of the backup gear extender unit. Airplanes that have had the backup gear extender

unit removed, or the system not installed, will get the warning light and horn only when the flaps are

extended to 10 or more. A micro switch installed on a cam located on the flap torque tube will when

closed, give an indication that the gear is not down and locked regardless of the gear lever up or down

position. When the airplane is setting on the ground, the warning circuit is controlled through the (NO)

side of the safety switch (squat switch) located on the left gear and on the up position of the gear selector

lever. When the airplane is raised from the ground, such as in flight, far enough to move the safety

switch to its (NC) position, then current is directed in series through the hydraulic pressure switch, the

pump switch (providing airspeed has actuated the switch to its (NO) position), and the up positioned

selector lever. The up limit, safety, pressure and selector switch, and pump solenoids are all protected

by the landing gear control and warning circuit protector. (Refer to Chapter 91 for electrical schematic.)

– NOTE –

PA32R-301 airplanes with s/n’s 32R-8013001 thru 32R-
8613005 and 3213001, and PA32R-301T airplanes with s/n’s
32R-8029001 thru 32R-8029110, 32R-8029121 thru 32R-
8629006 and 3229001 thru 3229002 may be equipped with a
back-up landing gear extender. Refer to Piper Service Bulletin
No. 866A

Piper PA-32R-301T SARATOGA S, Maintenance Manual

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