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 1 E20