beforeoperating deicers. Handle propeller carefullyto prevent damagingdeicers.
(h) Preparationand Application of Sealer
Propellerdeicers loosened due to adhesive bond breakdown by lubricants will not recement properly. Remove, clean, and reinstall deicers as follows:
(1.) Clean 0.500 inch wide area around circumferenceof propeller deicer down to bare metal usingMEK or acetone.
(2.) Clean outer 0.500 inch and 0.250 inch under deicers on all sides past loosened areas with MEK or acetone. For final cleaning, quickly wipe off solvents with clean, dry, lint-free cloth to avoid leavingfilm.
(3.) Recement loosened deicers surfaces.
(4.) Thoroughly mixfiller, sealer, or paint in proper proportions by weight as follows:
(a.) 82-075A/B: one part A/one part B.
(b.) 82-076-1/2: twelve parts 1/one part 2.
(c.) EC-1031/EC-801:twelve parts 1031/one hundredparts801.
(d.) C-19861/C21871/C-16176:onepart 19861/seven parts 21871/two and two-thirds
parts 16171.
EFFECTIVITY:
30-60-00AGE 15
Jan 10/90
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
B. MaintenancePractices (continued)
11. Deicer Boots (continued)
(h)Preparationand Application of Sealer (continued)
(5.) Place masking tape approximately 0.125 inch beyond cemented area around propeller deicer to allow application of filler directly to metal. Apply one even brush coat of 82-075A filler (or EC-801 sealer) over 0.125 inch of bare metal, cemented area, and boot for propeller deicers.
(6.) Ensure fillet filler completely covers area between propeller deicer strap and blade (Figure 402). Immediately remove marking tape from propeller. Allow filler to dry for 6 hours.
(7.) Apply new marking tape approximately 0.125 inch beyond filler to allow application of sealer directly to mounting surface. Apply one even brush coat of 82-076-1/2 sealer (or C-19861/C16176 paint) over 0.125 inch of mounting surface and 0.250 inch of deicer (Figure 402).
(8.) Ensure sealer completely covers area between deicer strap and blade on propeller (Figure 403). Remove masking tape immediately. Allow sealer to dry for 24 hours before starting engine.
82-076-1/-2 Sealer or C-19861/21871/16176 Paint
1/8 Deicer
CementedArea
Filler 82-075 A/B or Sealer EC-801
Sealer Application (Prop Boot)
Figure 402
SpecialAttention Should Be Given To This DistanceWhen Locating The Boot For Final BondingTo Propeller.
I
Seal
SealerApplication (Lead Strap)
Figure 403
EFFECTIVITY:
040-999
PAGE 16
Jan 10/90 30-60-00
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
B. Maintenance Practices (continued)
11. DeicerBoots (continued)
(i) Wrinkled Deicers (Figure 404)
If deicer edge is wrinkled or loose, recement edge. Use MEK or Toluol to loosen bond 1/4 inch
beyond loose or wrinkled area. Apply one coat of EC1300L or EC1403 cement to deicer and
bonding surfaces and allow to air dry for 1 hour. Apply second coat of EC1300L or EC1403
cement to both surfaces. Allow to dry. Retackify with MEK or acetone and press down with
fingers to work out wrinkles or secure loose edges. If material has stretched and will not
cement flap, replacedeicer.
Wrinkled Deicer Figure 404
When performing resistance check, electrically isolate propeller deicer circuits (if prop is installed) from rest of airplane wiring as follows: (1.) Remove brush block and disconnect timer and engine wire harness at convenient location
or retract brushes. Slip sheet of paper between brushes and slip rings.
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