5-37. RIGGING AND ADJUSTMENT OF WING FLAPS.
a. Place the flap handle in the full forward position. (Flaps Up)
b. To adjust the flap up stop and step lock, loosen the jam nut of the right torque tube stop screw, located in
the floor opening along the outer end of the flap torque tube, and turn the stop screw to obtain approximately .60
of an inch between the stop fitting and the bearing block as measured along the top side of the screw. (Refer to
Figure 5-15.) It may be necessary to loosen the adjustment screw of the left stop.
c. Place a .125 spacer between the stop fitting and the end of the screw. Determine that when pressure is
applied down on the flap, it will remain in the uplock position. If it extends, turn the adjustment screw out a few
threads at a time until the flap remains in the up lock position with the spacer inserted. Tighten the jam nut.
d. Rotate the left stop adjustment screw until it contacts the stop fitting. Tighten the jam nut.
e. Set the flap control cable tension (handle next to floor, 0 degrees) as given in Table V-l at the turnbuckle
that is attached to the lower end of the flap handle in the floor tunnel. To do this and if not previously removed,
remove the flap handle cover and enough tunnel carpet to remove the tunnel cover just aft of the handle. Adjust
and resafety the turnbuckle.
—NOTE-—
Do not rotate the torque tube while retensioning the cable or tighten tight enough
to allow the tube to be pulled away from its stops.
underside of the wing and flap as close as possible to the outboard end of the flap without contacting any rivets.
The tool must be positioned parallel with the wing ribs with the aft end of the tool even with the trailing edge of
the flap. (This tool may be fabricated from dimensions given in Figure 5-19.)
g. With the flap control rod connected between the torque tube crank arm and the flap, check that the surface
of the wing contacts the tool at its forward surface and at the spacer, and the aft end of the flap contacts the aft
end of the tool. The flap is neutral at this position.
h. Should the three points not contact, loosen the jam nuts on each end of the control rod and rotate the rod
until the three points contact. Apply a slight up pressure against the trailing edge of the flap while making this
adjustment. After adjustment, retighten the jam nuts.
i. Check and adjust the other flap in a like manner.
—NOTE—
In the event of wing heaviness during flight, the flap on the side of the heavy wing
can be adjusted down from neutral to remedy this condition by lengthening the
control rod. Check the inspection hole in each rod end to ascertain that there are
s u fficient threads remaining and a wire cannot be inserted through these holes.
Rod ends without check holes,- maintain a minimum of .375 of an inch thread
engagement. Do not raise the flap of the other wing above neutral.
required, readjust the torque tube stop screw in or out as required. After readjusting the screw. it will be
necessary to review steps c thru i.
k. Check operation of the flap and flap handle ratchet mechanism.
l. Install access plates and panels.
PIPER AIRCRAFT
PA-28-161 CADET
AIRPLANE MAINTENANCE MANUAL
Issued: FEBRUARY. 28, 1989
S U R FACE CONTROLS
1H5
