RIGGING AND ADJUSTMENT OF WING FLAPS
l. Place flap handle in full forward position.
2. If not done previously, remove rear seats.
3. To adjust flap up stop and step lock, loosen jam nut of right torque tube stop screw, located in floor
opening along outer end of flap torque tube, and turn stop screw to obtain approximately 0.60 of an
inch between stop fitting and bearing block as measured along top side of screw. (Refer to figure 27-
20.) It may be necessary to loosen adjustment screw of left stop.
4. Place a 0.125 spacer between stop fitting and end of screw. Determine that when pressure is applied
down on flap, it will remain in uplock position. If it extends, turn adjustment screw out a few threads
at a time until flap remains in uplock position with spacer inserted. Tighten jam nut.
5. Rotate left stop adjustment screw until it contacts stop fitting. Tighten jam nut.
6. Set flap control cable tension (handle next to floor, 0 degrees) as given in figure 27-22 at turnbuckle
attached to lower end of flap handle in floor tunnel. To do this and if not done previously, remove flap
handle cover and enough tunnel carpet to remove tunnel cover just aft of handle. Adjust and resafety
turnbuckle.
—NOTE—
Do not rotate torque tube while retensioning cable or tighten
tight enough to allow tube to be pulled away from its stops.
7. To check up-neutral position of flaps, place a flap rigging tool as shown in figure 27-2l against
underside of wing and flap as close as possible to outboard end of flap without contacting any rivets.
Tool must be positioned parallel with wing ribs with aft end of tool even with trailing edge of flap.
(This tool may be fabricated from dimensions given in chapter 95.)
8. With flap control rod connected between torque tube crank arm and flap, check that surface of wing
contacts tool at its forward surface and at spacer, and aft end of flap contacts aft end of tool. Flap is
neutral at this position.
9. Should three points not contact, loosen jam nuts on each end of control rod and rotate rod until three
points contact. Apply a slight up pressure against trailing edge of flap while making this adjustment.
After adjustment, retighten jam nuts.
l0. Check and adjust other flap in the same manner.
—NOTE—
In event of wing heaviness during flight, flap on side of heavy
wing can be adjusted down from neural to remedy this condition
by lengthening control rod Check inspection hole in each rod end
to ensure that there are sufficient threads remaining and a wire
cannot be inserted through these holes. For rod ends without
check holes, maintain a minimum of 0.375 of an inch thread
engagement. Do not raise flap of other wing above neutral.
11. Check flap for full down travel to degrees required in figure 27-22. If travel is not acceptable, readjust
torque tube stop screw in or out as required. After readjusting screw, it will be necessary to repeat
steps 4 through l0.
l2. Check operation of flap and flap handle ratchet mechanism.
l3. Install access plates and panels.
27- 52 - 00
Page 27 - 41
Reissued: August 1, 1986
1L16
PIPER AIRCRAFT
PA-28-236
MAINTENANCE MANUAL
To Next Page
Loading...
