MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
MT-7-420
9/02
9
11. Remove all inspection covers/plates and inspect all visible control cables, pulleys,
bellcranks, electrical wires and connections, fuel lines and fittings, nuts, bolts, etc.
for security, chafing, leaks, etc.
(CAUTION: If a wing has been removed and reinstalled, or a new wing installed, visually
inspect the routing of aileron cables through the inspection hole cover located on under-
side of wing, aft of rear spar and outboard of wing strut attach brackets. Ascertain that
cables are not routed over the strut attach brackets and are properly routed through the
fairleads and around pulleys. Ref. Maule Service Bulletin No. 12.)
12. CAUTION: At inspection hole in tail, visually check the pivoting action at the control
cable attachment points over the full range of rudder and elevator travel. This ac-
tion should be such that there are no bending loads imparted to the turnbuckles
(which are designed for straight tension load only). Any binding which causes bend-
ing of the turnbuckles should be removed. Any cable attachment parts which dis-
play appreciable corrosion must be replaced before further flight. NOTE: Pivot
points must be cleaned and lubricated with any lightweight lubricating oil. Following
lubrication, the cable attachments, including the turnbuckles, must be heavily coated
with a good preservative such as :
Black Bear Paralketone Preventative
LPS 3, Heavy Duty Rust Inhibitor
Black Bear Co. (preferred)
LPS Laboratories, Inc.
Long Island City, NY
Tucker, GA
NOTE: Maule Service Bulletin No. 9 covers corrosive resistant parts replacement and is
particularly recommended for airplanes operating in a potentially corrosive environment.
Compliance to this SB provides for larger stainless steel turnbuckles and corrosion resis-
tant steel fasteners and attachment details for the elevator cables.
13. CAUTION: Special attention should be given to the horizontal stabilizer strut lower
attach tubes which are welded to the lower longerons. The seal on the inside of the
lower strut attach stub tubes can deteriorate with age which could cause corrosion
on the interior of the attach stub tubes, especially on floatplane models. It is rec-
ommended that the stabilizer struts be removed to inspect attach stub tubes at each
annual. If there is visible external corrosion around the attach stub tubes, or the in-
ternal seal appears loose or cracked, remove the seal, clean the inside of the tube
and visually inspect the inside for corrosion. If corrosion is found, repair in accor-
dance with AC 43.13-1B. After repair, or if no corrosion is found, fill entire tube with
silicone rubber to seal tube from moisture. Inspect the struts for dents, corrosion, or
punctures and replace if necessary. Reinstall struts with new hardware and docu-
ment in aircraft records.
14. Lubricate all chains and points of rotation on sprockets, pulleys and bellcranks.
15. Inspect and lubricate all control surface hinges and control horn connections.
16. Lubricate door hinges and latches and seat tracks.
