040-999 30-10-00Jan 10/90
PIPERAIRCRAFT
PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. Airfoil-Description and Operation (continued)
PneumaticBootand Flow Strip Locations
Figure3 (Sheet 1 of 2)
EFFECTIVITY:
040-999
Jan 30-10-00Jan 10/90
PIPERAIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
A. Airfoil -Description and Operation (continued)
11. Installation(continued)
WingLeadingEdgeCenterline
Flow Strip Flow Strip
± 0.060
Tolerance
Wing
Leading Edge
PneumaticBootand Flow Strip Locations
Figure3 (Sheet 2 of 2) (continued)
EFFECTIVITY:
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30-10-00 PAGE 23
30-10-0010/90Jan
PIPER AIRCRAFT
PA-42-720(Advanced Trainer)
MAINTENANCEMANUAL
A. Airfoil-Description and Operation (continued)
11.Installation (continued)
(d)AdhesionTest
Using excess boot material trimmed from ends of wing and empennage deicers, prepare a test specimenfor each deicer installed. The specimenmust be a 1 x 8 inch thick strip of boot materialcementedto wing skin adjacent to installed boot. Leave 1 inch of strip uncemented to attach clamp. Four hours or more after installation, attach spring scale to uncemented end of each strip and measure force required to remove strip at rate of 1 inch per minute. Apply pull 180 degrees to surface. A minimum of 5 pound tension (pull) is required to remove test strip. If less than 5 pounds is
required, acceptance of boot adhesionis based on the following tests:
1.
Carefullylift one comer of boot enough to attach spring clamp.
2.
Attach spring scale to clamp. Pull up 180 degrees to surface to boot is removed diagonally.
3.
If a force of 5 pounds per inch of width can be exerted, the installation isconsidered satisfactory. (Width increases as corner peels back.)
4.
Re-cementcomer.
NOTE: Reasons for improper adhesionaredirty surfaces and cement not reactivated properly or mixed thoroughly. Corrosionof metal skin can occur if proper adhesion is not attained, especially around rivet heads and metal skin splices.
If adhesion requirements are met, airplane can be flown immediately. Do not inflate deicers within 12 hours of installation or until adhesion strength of 8 -10 pounds is obtained.
12.Maintenance
Clean deicers with mild soap and water solution. In cold weather, wash boots in warm hanger, if possible. If cleaning is done outdoors, use heated soap and water solution. If water freezes on boots, use portable ground heater to thaw. Use Benzol or non-leaded gasolineas alternatives. Moistencleaningcloth in solvent. Scrub lightly and with clean, dry cloth, wipe before cleaner soaks into rubber. Sparingly use petroleum productswhich damage rubber.
13. Icex Application
B.F.Goodrich Ices is a silicone base material specificallycompoundedto lower adhesion strength between ice and rubber surfaces of deicers. Icex will not harm rubber and offers added ozone protection. Properly applied and renewed at recommended film
intervals,Icex provides a smooth polished which evens out microscopic irregularitieson rubber parts surfaces. Ice formations also have less chanceto cling and ice is removed faster and cleaner when deicers are operated. Icex will not prevent or remove ice formations, but keeps it from getting a strong foothold. Before applying Icex, thoroughly clean deicer or other rubber surfaces with rag dampened with non-leadedgasolinefollowed by scrub wash of mild soap and water. Allow time for surfaces to dry. Shake Icex can well. Hold nozzle approximately 12 inches from surface and spray sparingly. If applicationis too heavy, resulting sticky surfacepicks up runway dust and inhibits ice removing efficiency. Due to natural abrasive effects on leading edges of deicers during flight, reapply Icex to wings and empennagedeicers every 150flighthours.
EFFECTIVITY: 040-999
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PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Airfoil-Description and Operation (continued)
14. ResurfacingConductiveCement
(a) Materials
The following materials are required to remove andreplace damaged coating:
(1.) Fine grit sandpaper.
(2.) Two inch paint brush.
(3.) One inch masking tape.
(4.) Conductive Neoprenecement (No. A-56B, B.F. Goodrich Co.).
(5.) Isopropyl Acetate, Federal Specification
TT-1-720.
(6.) Alternate solvent-(Toluolor Toluene).
CAUTION: CEMENTS AND SOLVENTS USED FOR RESURFACING ARE FLAMMABLE AND FUMES ARE SLIGHTLY TOXIC. CONDUCT ALL WORK IN A WELL VENTILATED AREA AWAY FROM SPARKS OR FLAMES. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：夏延飞机维护手册 Cheyenne IIIA PA-42-720 AMM 2(20)
