MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
M-4-180V
16
Rev. A
4/13/16
To check the dihedral angle at the front spar, proceed as follows:
Stretch a string along the top of the wing above the front spar, from wing tip to wing tip,
and draw it tight. Check the dimension vertically from the top of the spar at root end fitting.
The correct dihedral dimension should be three (3) inches
±
1/8.
Using a level (without any spacer blocks) hold it spanwise against the bottom of the wing
under the front spar just outboard of the fuselage.
Note the position of the bubble and do the same on the other wing. Readjust the front
struts until both wings show the same amount deviation from level being careful with each
adjustment to set the left strut out the same number of turns as the right one is set in, or
vice-versa.
3. WASH OUT:
To adjust the wash-out in the wings, proceed as follows:
Put a leveling protractor chordwise on the underside of the wing root and adjust it to a
zero degree reading. Now put the protractor chordwise just inboard of the wing tip and
adjust the rear strut to give ½
°
trailing edge up, difference from the wing root angle.
4. TAIL ASSEMBLY:
With the airplane in level position, the stabilizers should be leveled at their rear spars.
The hinge line should be straight from tip to tip. The vertical stabilizer should be plumb at
the hinge.
5. AILERONS:
Adjust the ailerons to streamline position by placing a straight edge on the bottom of the
wing chordwise at the inboard end of the aileron. Then adjust the turnbuckles in the aileron
system so the control wheels are centered and there is a gap of zero to ¼ inch between the
straight edge and the trailing edge of the aileron.
5. AILERONS: Cont’d
Check the aileron travel for 20
°
±
1
°
up and 20
°
±
1
°
down. Adjust turnbuckles to stay
within these limits. Proper cable tension is 15 to 25 lbs.
6. FLAPS:
Adjust the first notch flap position to be aligned with the aileron trailing edge with the
ailerons centered. Check the flap travel for 20
°
±
3
°
down for the first notch, 35
°
±
3
°
down
for second notch and maximum travel of 40
°
. Adjustment, if needed, may be accomplished
by adjusting turnbuckle at the flap control lever or behind the baggage compartment.
7. RUDDER:
