MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
MT-7-420
9/02
5
SECTION II
GENERAL MAINTENANCE
CLEANING AND CARE OF AIRCRAFT
Keeping the performance, speed and durability that was built into your aircraft at the factory
requires more than casual attention. The accumulation of dirt and oil on the outside and debris
inside does affect these factors and can be a fire hazard as well. The first step to proper main-
tenance is a clean aircraft.
Exterior
Frequent washing is good for your aircraft finish, especially during the first few months. Use
any quality car wash with a soft cloth or sponge and plenty of clean water-do not use dishwash-
ing detergent. Drying should be done with a chamois. Accumulation of oil, grease and exhaust
carbon deposits should be removed frequently by using a soft cloth soaked in mineral spirits or
other neutral cleaner.
For general polishing, apply a good quality car polish or wax according to instructions.
Clean Plexiglas with plenty of soap and water using grit free soft cloth, chamois or sponge. Use
of a dry cloth on Plexiglas will not only cause scratches but will also build up an electrostatic
field which will attract dust to the surface. Blotting with a clean damp chamois will remove the
charge and the dust. After cleaning, polishing with a good Plexiglas cleaning product such as
"Mirror Glaze" will keep the glass clean and help polish out minor scratches.
Experience has shown that airplanes based at coastal airports or where there is an other-
wise corrosive atmosphere require special treatment to prevent corrosion, specifically "electro-
lyte corrosion". Salt water and chemicals act as an electrolyte between dissimilar metals and
can start a strong corrosive action over a short period of time. Maule makes every effort to
separate dissimilar metals with primers and coatings during manufacture, but there are some
locations (such as rivets in wing skins) where this is impossible. To combat corrosion it is im-
portant that the external painted surfaces be kept clean and well waxed. Wash the airplane
with fresh water frequently to remove any salt or chemical film. Periodically, coat the wings,
flaps and ailerons internally with a quality corrosion preventative, several of which are available.
Floatplanes require more extensive preservation techniques which are well known in the field.
Interior
Floorboards should be vacuumed frequently and can be cleaned with any good rug cleaner.
Care should be taken in the disposal of candy wrappers, paper scraps, cigarette butts, etc.
These can work their way under the floorboards and become a fire hazard and moisture trap.
NOTE: While washing the aircraft, ascertain that all drain holes are open. Clean out any debris
