MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
MX-7-420
19
Rev. A
10. RUDDER TAB:
This tab is interconnected with the aileron system to automatically coordinate rudder
with aileron to reduce adverse yaw. The tab should normally be streamlined with the
rudder when the aileron and rudder controls are centered.
The tab may be used to adjust rudder trim. In normal cruise, it is desirable to have
the ball centered with the “Rudder Trim” control out to first line. This allows for inflight
adjustment of rudder trim in cruise. Rudder trim may be adjusted by changing the posi-
tion of the tab cables located just over the front doors on the inside of the airplane.
The tab travel is 48
°
±
4
°
right or left. Proper cable tension is 5 to 10 lbs.
CAUTION: Make sure tab is free at extreme aileron travel.
NOTE: The “Rudder Trim Control” on the instrument panel pulls on a spring attached
to the right rudder pedal. It is not connected to the tab on the rudder.
LUBRICATION
1. Main wheel bearings - Use good quality wheel bearing grease.
2. Oleo shock struts – For P/N 4015B oleo spring, use New Holland No.134 hydraulic oil or
Ford Tractor No. ESN-M2C134-D. 10W30 engine oil may also be used. For P/N 4161B
oleo spring use API GL-4 or GL-5 85W-140 gear oil.
3. Landing gear hinges – Use engine oil.
4. Control Column - Apply light coat of graphite base lubricant to aileron balance chain, tor-
que tube and control guide. Use lightweight lubricating oil on all other bearings.
5. Control pulley bearings and control surface hinges - Use lightweight lubricating oil.
6. Flap bellcrank and mechanism - Use lightweight lubrication oil.
7. Aileron and flap hinge - Use lightweight lubricating oil.
8. Elevator and trim tab - Use lightweight lubricating oil.
9. Tailwheel - Good quality wheel bearing grease to tailwheel bearings through zerk fitting.
Same for fork spindle roller bearings, if necessary. See tailwheel maintenance section
under "Landing Gear, Wheels and Brakes".
