MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
M-7-235C
Rev. D
17/37
RIGGING PROCEDURES
1. LEVELING:
Laterally:
The airplane can be accurately leveled laterally using the front spar attach bolts.
Turn these two bolts so that a flat on the head is "up". Fabricate two equal length
spacers (1½ inch minimum length) which can be placed on the bolt heads. Place
a 48 inch level across the two spacers and block under the landing gear to center
the bubble.
Longitudinally: Using a level thirty six (36) inches long or longer, place it on the leveling lug
and leveling mark thirty one (31) inches to the rear of the leveling lug on the
bottom of the right wing root.
Raise the tail to bring bubble to center.
2. DIHEDRAL ANGLE:
To check dihedral angle at the front spar, remove both top wing root fairings to expose the
front spar attach bolts. Stretch a string along the top of the wing above the front spar, from
wingtip to wingtip, and draw it tight. String can be attached to tie down fittings underneath the
wing to hold tautness. Be careful to protect the edges of the wingtips from string chafing.
Find the row of flush rivets on the top of each wing from wingtip to wingtip at the front spar
location. Measure from the forward wing to fuselage attach bolt centerline, for both left and
right wings, outboard 127.5 inches along the top of each front wing spar. Using masking tape
or equivalent, tape the string down on the rivet centerline at this point.
At the inboard end of the front spar, measure the distance from the top rear edge of the
spar cap to the string for both wings. Adjust the front wing struts so as to have a measure-
ment of 2 3/4 inches on each wing (plus or minus 1/8 inch) at this location. It is recommended
that the rear struts be removed while adjusting dihedral. The wing must be supported while
the front strut is being adjusted. For rear strut adjustment, see section on washout.
CAUTION: Be sure that the strut fork is not extended more than
1 inch of threads from the
strut end to the end of the fork threads (not including the jam nut)
. There must be at least 1
3/8 inch of thread engagement into the strut.
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.
