MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
MT-7-420
9/02
6
blocking them. Accumulated water can be dangerous, so check behind the baggage compart-
ment frequently.
Interior:
Cont’d
Textile upholstery may be cleaned using a vacuum cleaner. Grease and oil spots on the
upholstery should be treated with a spot remover or dry cleaning fluid. Do not use soap and
water on textile materials.
Vinyl upholstery may be cleaned using soft whisk broom or suds of any mild soap (castile or
olive oil base) in lukewarm water. Use water sparingly as the upholstery otherwise requires a
long time to dry if water trickles through the seam stitches.
For best results, stains, especially those caused by grease or paint, should be removed
from upholstery as soon as possible or they may become “set”" and hard or impossible to re-
move. "Set" stains should be removed carefully with a clean cloth dampened in denatured al-
cohol. Stains caused by shoe polish can best be removed with turpentine. However, such
cleaning agents are liable to affect the dust-repellent finish of the vinyl if used in excess of the
actual requirements. Never use volatile solvents such as lacquer thinner, acetone, etc. on up-
holstery.
The cleaning should be completed by wiping the surface of the vinyl dry with a clean cloth,
particularly in the seam. No attempt should be made to apply preservatives such as wax, pol-
ish, or varnishes, as these will not be absorbed by vinyl, but will merely collect dust. There are
protective treatments made especially for vinyl which are commercially available and quite satis-
factory.
Leather upholstery should be cleaned by leather cleaning methods using leather-cleaning
products.
INSPECTION GUIDES
Airframe Inspection
At 25 Hour Total Time, perform 50 Hour Inspection as described below:
At 50 Hour Total Time and every 50 hours thereafter, perform 50 Hour Inspection as de-
scribed below
:
1. Check battery for general condition and electrolyte level.
2. Check all main electrical connections.
3. Check fluid level in brake reservoirs.
4. Check the entire fuselage, tail surfaces and wing skins for cracks, security of fair-
ings and general condition.
