servicelifeofdeicerwillbe extended. Applyrepairpatchas outlinedin paragraph (2) (a.).
(5)
DamageToFabricBackPlyOfDeicer During Removal-If cement haspulledloosefrom wingskinand adhered tothe back surface of deicer, removewith clean ragandMEK.In spotswherecoatinghas pulled off fabric, leavingbarefabric exposed, applyat leasttwo additionalcoatsof cement (P/N 74-451-24) and allow eachcoat to dry thoroughly.
EFFECTIVITY: 040-999
Jan 10/9030-10-00
PIPERAIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
A. Airfoil -Description and Operation (continued)
(a) Cold Repair (continued)
CHART 3 (Sheet 1 of 2) MATERIAL AND SUPPLIES FOR COLD REPAIR
PartNo.
74451-C (FSN1650-856-7939) 74-451-11
74-451-16
74-451-17
74-451-18
74-451-19 74-451-20
74-451-70 74-451-73 74-451-75 74-451-87
Quantity
1
1/1pt. can
30 pcs.
30 pcs.
10 pcs. 3 pcs.
(2) 1/2 pt.
2 1
6 1
*This cementwillgive best results with the patches in this kit.
The following items may be procured from the B. F. Goodrich Co., Akron, Ohio, or other manufacturer, as required:
74-451-21
74-451-22
74-451-23
74-451-24
(FSN 8040-628-4199 and/
or FSN8040-S141880)
74-451-74
74-451-100
6 ft. roll x 6 in. wide 15 ft. roll x 2 in. wide
4 ft. roll x 8 in. wide 1 quart
1 1
Description
Cold Patch RepairKit
(B. F. Goodrich Co.)
A-56-B Conductive
Cement
Small oval patch
1 1/4 x 2 1/2 in.
Medium oval patch
2 1/2 x 5 inch
Large oval patch
5x10 in.
Patch 5 x 19 inch.
*No. 4 Cement
(patching only)
Cement Brush I j2 in.
1/8 in. Steel Stitcher
Emery Buffing Sticks
Buffing Shield
Type 21 or 22 Fillet
Neoprene coated splicing
tape
Neoprene surface ply
§ EC-1403 cement and/or
EC-1300L
2 1/2 in. spongerubber
roller
2 in. dia. x 2 1/2 in. rubber
roller
§ EC-801 filler compound
§ Minnesota Mining and Manufacturing Company, Adhesives Division, 411 Piquette Ave., Detroit, Michigan.
EFFECTIVITY:
040-999
30-10-00 PAGE 11
Jan 10/90
PIPERAIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. Airfoil-Description and Operation (continued)
(a)ColdRepair(continued)
CHART3 (Sheet2 of 2)
MATERIALANDSUPPLIESFORCOLD REPAIR
Part No. Quantity Description
The following materialsmay be obtained fromlocal supply:
Toluol As required Clean,Lint-FreeCloths (preferablycheesecloth)
Rolls 1 in. MaskingTape
1 SharpKnife
6 ft. long SteelMeasuringTape
1 FineSharpeningStone As required SteelWoolPads Asrequired Hypodermicneedles (22gaugeorsmaller)
Methylethylketone(MEK) can be used instead of Toluol,howeverMEK causesvery rapid drying and -providesonly 10 seconds workingtimecompared with 40 seconds for Toluol.
(b)VulcanizedRepair
Vulcanizedrepairsmustbe made at an approveddeicerinstallationstation.Careful
considerationmustbe given to overall conditionof deicer. f large partsofdeicerstretcharea arecrackedorcheckedto a depth of over 0.005inch, do notrepair.Deicerswith slight checks in stretchareacan be coatedwithconductivecement.If checking isdeep but restrictedto smallarea,repair damaged area. Deicersswelledorsoftenedby contact withoilor other
harmfulagentsmustbescrapped.Determineifdamageisrepairableby depending upon carefuljudgmentofinspectorandexperienceandtrainingofworkman.
(c) MaterialsForVulcanizedRepairs
Theeffectivenessof any repairdependsonananalysisof damage andselectionof correct repairmaterial.Deicersarecompoundedto resistsunlightandweather,andretainflexibility. Useonlymaterialslistedin Chart 4 when makingvulcanizedrepairs.Selectmaterialsspecified foreachrepairandavoidsubstitution.Since many materialsaredustedwithsoapstone,wash all materialscarefullywithwashingorcleaningsolventbeforeuse. Chart5 liststoolsand equipmentsuitablefor repair work.
EFFECTIVITY:
040-999
Jan 1209030-10-00Jan 10/90 30-10-00
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
