Piper COMANCHE PA-24-180 Service Manual page 116

4-42. Installation Of AOF Loop Anteaia. (Fixed and Rotor type)
a. Locate the ADF loop antenna mounting opening on the bottom of the fuielage and connect
the two antenna couplings to the unit from inside the fuselage. This will pertain to both types
of antennas.
b. Place the corrector loop over the antenna loop and install the four No. 8-32 mounting
screws, then install loop housing with eighteen No. 8-32 machine screws.
c. If the fixed type loop is used, installation will consist only of connecting the antenna
leads and mounting unit to the fuselage surface.
4-43.
Installation Of Marker Beacon Antenna.
a. Mount the marker beacon antenna on the bottom rear skin of the fuselage forward section.
b. Connect the antenna lead-in wire to the insulator mounted on the bottom rear skin of the
fuselage.
4-44. Fiberglas
Repairs. The repair procedure in this manmal will describe the methods for
the repair of fiberglas reinforced structures.
Paragraph 4-45 describes Touch-up and Surface
Repairs such as blisters, open seams, delaminations, cavities, small holes and minor damages
that have not harmed the fiberglas cloth material. Paragraph 4-46 describes Fracture and Patch
Repairs such as puncture, breaks and holes that have penetrated through the structure and dam-
aged the fiberglas cloth. A repair kit, part number 756 729, that will furnish the necessary
material for such repairs is available through Piper Aircraft Distributors.
NOTE
Very carefully follow resin and catalyst mixing instructions
furnished with repair kit.
4-45.
Fiberglas Touch-Up And Surface Repairs.
a. Remove wax, oil and dirt from around the damaged area with acetone, Methylethylketone
or equivalent and remove paint to gel coat.
b. The damaged area may be scraped with a fine blade knife or a power drill with a burr
attachment to roughen the bottom and sides of the damaged area. Feather the edge surrounding
the scratch or cavity. Do not undercut the edge. (If the scratch or cavity is shallow and pene-
trates only the surface coat, continue to step h.)
c. Pour a small amount of resin into a jar lid or on a piece of cardboard, just enough to fill
the area being worked on. Mix an equal amount of milled fiberglas with the resin, using a putty
knife or stick. Add catalyst, according to kit instruction, to the resin and mix thoroughly. A
hypodermic needle may be used to inject gel into small cavities not requiring fiberglas millings
mixed with the gel.
d. Work the mixture of resin, fibers and catalyst into the damaged area, using the sharp
point of a putty knife or stick to press it into the bottom of the hole and to puncture any air
bubbles which may be present. Fill the scratch or hole above the surrounding undamaged area
about 1,16 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 until
it
feels rubbery to the touch. Remove the
cellophane
and trm flush with the surface, using a sharp razor blade or knife. Replace the
STRUCTURE
ISSUED: 8/18/72
1 E20
PIPER COMANCHE SERVICE MANUAL