Repairof Lead Strap
Figure 801
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MAINTENANCEMANUAL
B. MaintenancePractices(continued)
11.DeicerBoots(continued)
(d) Removalof Deicers
(1.) Disconnectpropellerdeicerterminalsat studs on spinnerbulkheadandlip deicer terminalsatboot. (2.) UseMEKorToluoltosoftenadhesionlinebetweenbootandmountingsurface. (3.) Startingatonecomerof deicer, loosendeicerenoughtograspwithvisegrips pliers or
similartool.
(4.) Applysteadypull on deicerto pull it off mounting surface.ContinueusingMEKor Toluol to soften adhesionlines. Unless deicerisdamagedbeyondrepair,cushionjawsofpullingtoolto prevent damagetodeicersurface.Removeslowlyandcarefully.
(5.) RemoveresidualcementfrombladeusingTurco3 or equivalent.
(e) Preparationof SurfacePriorto Installationof Deicer
Preparepropellerbladesurfacefor proper deicerbootsinstallationas follows: PropellerBladeProtection (1.) Markand cut maskingtape samesizeas propellerdeicerincludingfirstinchof leadstrip(Figure401). (2.) Placemark at bladehubend in line with bladeleadingedge. (Location of markis determinedby sighting alongleadingedge.) Startingat hub,centertape on markand sticktape leadingedge. Markpositionof deicer lead strapwhereit crosses hub.
NOTE:Alldeicersonsinglepropellermust be equallydistantfrom hub or rational balance.
(3.) Removetape and paint in markedoff area down to baremetal. Clean area thoroughlywith MEKor acetone. Forfinalcleaning,wipesolventoff quicklywith clean,dry,lint-free clothto avoidleavingfilm.
CAUTION: METALAND RUBBERPARTSMUSTBECLEANTO ASSURE MAXIMUM ADHESION.
(4.) Markcenterlineat propellerbladehubandon tape atoutboardedgeof marked area.
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PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
B. MaintenancePractices(continued)
11. Deicer Boots (continued)
(e) Preparation of Surface Prior to Installation of Deicer (continued)
Center Line
r-Pattern
Masking Tape
PropellerDeicer Installation Figure401
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PIPER AIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
B. MaintenancePractices(continued)
11.DeicerBoots (continued)
(f) Applicationof Cement
To apply cement on boots and mating surface, proceed as follows:
(1.) Mark centerline on glossy side of deicer with silver pencil.
(2.) Moisten clean cloth with MEK or acetone andclean unglazed surface of deicer, changing cloth frequently to avoid contamination
of clean area.
(3.) Thoroughly mix EC1300L or EC1403 cement and apply one even brush coat to unglazed back surface of deicer. Cement one inch of deicer lead strap. Allow to air dry for minimum1 hour at 40°F or above with relative humidity less than 70%. If humidity is 75% to 90%, allow 2 hours drying time. Do not apply cement if relative humidity is higher than 90%. Apply second even brush coat of cement.
NOTE: If deicer edges curl, apply masking tape to edges of glazed side before applying cementto unglazed side. Remove tape before installing deicer.
(4.) Apply even brush coat of EC1300L or EC1403 cementon cleaned surface of propeller blade immediately afterapplicationof second coat of cement of deicer. (Timing is importantas cement on both surfaces mustreach tack stage at same time.)
CHART 1 REQUIRED MATERIALS FOR REPAIR OF DEICERS
The materials and tools listed below are commercially available and are not supplied by B. F. Goodrich in kit form.
Item Amount
CementEC-1300L or EC-1403 (3M Mfg. Co.) 1 1/2 pt. for six blades
Sealer A56B (B. F. Goodrich) 1 pt. for six blades
Cleaning Solvent MEK (Methylethylketone) or Acetone
B. F. Goodrich Filler 82-075A and B or 3M Sealer
EC-801 and EC-1031
B. F. Goodrich Sealer 82-076-1 and -2 or Lowe
Brothers' paint C-19861, C21871 and C-16176
Cleaning Cloth -any clean, lint-free cloth
2 inch Rubber HandRoller
1/4 inch Metal Hand Stitcher
Scissors
Turco #3 (Turco Products Co.) 1 1/2 pt. for six blades
Masking Tape
EFFECTIVITY: 040-999
Jan 10/90PAGE30-60-00
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
B. MaintenancePractices (continued)
11. Deicer Boots (continued)
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