MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR M-5-220C
Rev. B 11/38
2. Examine all front cockpit electrical connections and wires, fuel lines and fittings,
control cable attachments and pulleys for security, leaks, chafing, etc.
MECH INSP
3. Remove rear seat, rear floorboard and panel behind baggage compartment.
4. Remove front seats and front and center floorboards.
5. Inspect all control cables, pulleys, fairings and electrical connections and wires
for security and chafing.
6. Open zippers in headliner and inspect all control cables, pulleys, fairleads and
electrical connections and wires for security and chafing.
7. Remove wing root fairings and inspect control cables, fairleads, fuel lines and
connections, and electrical wires and connections for security, chafing, and
leaks.
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 underside of wing, aft of rear
spar and outboard of wing strut attach brackets. Ascertain that cables are not over the strut attach
bracket and that they are properly routed through the fairleads and around the pulleys.
8. Remove wing strut fairings, top and bottom, and inspect attaching fittings and
bolts for security, corrosion, and cracks. Carefully inspect both sides of lift
struts for abrasion, corrosion, pinholes, and punctures. Any paint loss or minor
corrosion should be sanded down to bare metal with fine sandpaper and metal
primer should be applied. After the primer is dried, a finish coat of the desired
color may be added. Powder coating is recommended if complete strut is being
refinished.
If powder coating exterior of sealed strut assembly, remove plug from lower end before painting. Oil-
coat internal walls of strut as follows (to be done after painting only): Inject into strut approximately
one quart of Valoil or Lionoil Multi-purpose L-1, Linseed Oil, Paralketone, LPS-3, Randolph Tube Oil
No. 315, Tubeseal (Lineoil) or any other preservative oil conforming to Federal Spec. TT-S-176D, Mil-
C-82309E, Type II or Mil-C-6708, Type I. Reinstall plug and slosh oil until interior of strut is thorough-
ly coated. Remove plug and drain oil from strut. Reinstall plug. Optional: pressure test to 4 psi +/-1
for leaks using soap solution.
WARNING: Any unrepairable dents or punctures in strut are cause for replacement of the strut.
CAUTION: If aircraft has original unsealed struts, comply with Maule Service Bulletin No. 11 (AD# 98-
15-18) as required. (New sealed struts are identified by two weld spots located at upper end. Re-
moval of the upper cuff is needed to locate the weld spots). Also, do not replace lift struts with older
M-4 struts with the 7/16” dia. lower fork. 1/2” dia. fork is required for all later models.
CAUTION: Item (a)(4) of AD# 98-15-18 is very misleading as Maule never drills holes in struts to at-
tach cuffs, door clips or any hardware and it is illegal to do so since there are no approved holes in the
wing struts under the TC data. If aircraft has a modification added requiring a drilled hole in strut un-
der a #337, refer to AD for inspection requirements at the 24-month intervals. Also, inspect the area
around the holes(s) frequently for corrosion or cracking (ref. SL#58).
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