MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
MT-7-420
9/02
22
SURFACES AND CONTROLS
AILERONS AND FLAPS:
The ailerons and flaps are aluminum alloy structures covered with 2024-T3.
The aileron control system consists of a chain drive connecting the two control wheels
and is attached to the necessary cables which are routed over pulleys through the fuselage
and into the wing section to the aileron horns.
The flap control system consists of a control lever which has four active positions, (-7
°
,
0
°
, 24
°
, 40
°
). This is connected to the control cables (and spring cartridge located directly
behind cargo area) which are routed over pulleys through fuselage and connected to chain
drive located directly above the cabin area. This chain drive is connected to a torque tube
which operates the flap through a push-pull rod attached to the inboard hinge fittings.
ELEVATORS:
The elevator has chrome molybdenum (4130) internal structure covered with Ceconite
fabric. Inspect for corrosion. Drain grommets should be kept open. The hinge attachments
should be lubricated with light engine oil. Accumulations of dust and dirt on hinges should be
removed.
STABILIZERS:
The stabilizers have chrome molybdenum steel (4130) internal structures covered with
Ceconite fabric. Inspect for corrosion including elevator hinges and struts.
RUDDER:
The rudder structure is very similar to the elevators. No maintenance other than inspec-
tion for corrosion is needed. The hinges should be cleaned and lubricated with light engine
oil at frequent intervals. The cable attachment points should be checked for wear and corro-
sion.
TRIM AND RUDDER TABS:
These surfaces have low carbon steel frames with aluminum alloy skin (2024-T3).
These surfaces need no maintenance other than inspection for corrosion. The hinges
should be lubricated at frequent intervals using light engine oil.
