Adf Loop Antenna Installation; Marker Beacon Antenna Installation; Fiberglas Repair; Fiberglas Touch-Up And Surface Repairs - Piper PA-24 Comanche Service Manual

PIPER COMANCHE SERVICE MANUAL
4-42. Installation Of ADF L.o, Anto"ftll. (Fixed and Rotor type)
a. Locate the ADF loop anteana mountinc open.iq on the bottom of the fllSelace and conneet
the two antenna couplings to the unit from inside the fllSelace. This will pertain to both types
of antennas.
b. Place the corrector loop over U.- antenaa loop and install the foUl No. 8-32 mounting
screws, then install loop bousiftl with eilht"ft No. 8-32 _chi..
IC,.. . .
c:.
If the
fixed type loop is \lied, instaUation will consist only of c:onnectiftl the antenna
leads and mou.ntinc unit to the fu. . lap surface.
4-43. Instollotio..
Of
Morlter B.aCOll A"te"fto.
a. )'fount the lIIlIrker beacon antenna on the bottOlb rur skin of the fus.lap forward section.
b. Connect the antenna lead·in wire to tbB insulator mounted on the bottom rear skin of the
fUllelale.
4-~.
Fiber,las Repairs. The repair proc.dur. in this tDlnual will describe the methods (or
the repair o( fiberpu reinforced structure.. PIlralrapb
4-4S
dHcribe. Touc:J!.up and SlUface
Repairs such as blisters, . n seams. delaminationa. cavities. __ 11 hole,
and minor damaces
that have not harmed the fiberala. cloth material. PIlralraph
4-46
dHcribes Fracture and Patch
Repairs such as punctlUe. break. and holes that bave penetrated tnrOlllh the structure and darn.
aCed the fiberllas cloth. A repair kit. pan number 756 729. that will furnish the necessary
material for such repairs is available throulh Piper Aircraft Distributors.
HOTE
Very carefully foHow res in and catalyst mixine instructions
furnished with repair kit.
4-45. Fib.r,la. Touch·Up And
Surface Repelrs.
a. Remove wax. oil and dirt from around the damepd .,.a with acetone. :wethylethylketone
or equivalent and remove paint to 1"1 coat.
b. The damased area may be scraped with a fine blade knife or a pewer drill with a burr
attachment to rOl1lhen the bottom and sid. of the dalllllpd area. Feather the eelle surrounding
the scratch or eavity, Do not undercut the ed.e.
(If
the Icratch or cavity is shallow and pene·
trates only the surface coat, continue to Ite, h.)
c. Pour a small amount of resin into a jar lid or on a piece of cardboard, just enouch to fill
the area being worked on. :\fix an equal amount of milled fib.rela with the resin. usinC a putty
knIfe cr stick. Add
catal~t.
accordiftl to kit instruction, to the resin and mix thorouchly. A
hypodermic needle :nay be used to inject leI into small cavities not requirinc fiberllas millings
mixed with the gel.
d. Work the mixture of resin. fibers and catalyst into the dameleel area. lISing the sharp
point of a putty knife or stick to press
it
into the bottom of the hole and to puneture any air
bubbles which mlly be present. Fill the scratch or hole above the surround inc undamaged area
about It 16
inch.
e. Lay a piece of cellophane or waxed paper over the repair to cut off air and start the cure
of gel mixture.
f. Allow the gel to cure 10 to 15 minutes u.ntil it feels rubbery to the touch. Remove the
cellophane and trim flush with the surface. using a sharp ruor biade or knife. Replace the
STRUCTURE
ISSUEC: 8/18/72
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