PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
9. InspectionItem,Part, Description, Referenceand Action (continued)
(d) FuselageLowerRearFrame(F.S. 174.00 to 215.00)
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LEGEND A= BULKHEAD STRINGERCUTOUT O = BULKHEADEND
= CHANNEL
TypicalInspectionAreas
Figure605 (Sheet 4of 7)
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MAINTENANCE MANUAL
9. InspectionItem,Part, Description, Referenceand Action (continued)
(e) FuselageAft Section (F.S. 215.00 to 280.00)
Item 101
LEGEND
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MAINTENANCEMANUAL
9. InspectionItem, Part,Description,ReferenceandAction (continued)
(f) FuselageAft Section(F.S.280.00to 334.00)
4
Item
A1B-
Item85
LEGEND
A = BULKHEADSTRINGERCUTOUT
O = BULKHEADEND
= CHANNEL
TypicalInspectionAreas Figure605 (Sheet6 of 7)
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10/90
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MAINTENANCEMANUAL
9. InspectionItem, Part,Description,ReferenceandAction (continued)
(g) FuselageFloorboardInstallationandCabin Door Entrance
Cabin Door Entrance
Item55
LEGEND
= BULKHEAD STRINGERCUTOUT
O = BULKHEAD END
= CHANNEL
Typical Inspection Areas
Figure 605 (Sheet 7 of 7)
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MAINTENANCEMANUAL
A. Processes
1. Sealing Procedures
(a) Sealing of Nacelle Fuel Tank
The following procedures must be used for repairing leaks in the nacelle fuel tank. Using the specified materials allows the least amount of aircraft down time during repair.
(1.) Surface Preparation
(a.) In areas where the original sealant has been scratched, gouged, or otherwise damaged, remove damaged section of fillet with a sharp plexiglas scraper. Taper all cuts in the old sealant at a 45 ° angle.
(b.) The original sealant in the fuel tank will be fuel soaked and must be dried in the repair area. Use a vapor-proof heat lamp or hot air blower.
(c.) Thoroughly clean all areas to be repaired with solvent such as methylethylketone (MEK). A progressive cleaning procedure must be used. Wash a small area at a time and dry with a clean cloth before the solvent evaporates to prevent redeposition of the oil, fuel, etc, on the surface. Always pour solvent on washing cloth to maintain a clean solvent supply. Do not use reclaimed solvents.
WARNING: DO NOT ALLOW ALODINE SOLUTION TO COME IN CONTACT WITH HANDS, EYES OR CLOTHING.
(d.) Check damaged area for other repairs which have to be made before applying new sealant. Re-alodine aluminum surfaceswhere the original alodine coating has been removed.Apply alodine 1200 solution (undiluted) to affected area with a small nylon brush. Allow solution to dry until a light golden color appears. When a coating has beenformed, remove excess solution by wiping with a clean water moistened cloth; wipe dry.
(e.) Just prior to application of PR-1435-G sealant,the affected area must be recleaned with MEK (per instruction given in step (c.)).
(2.) Material Preparation
WARNING: PR-1435-G SEALANT CONTAINS FLAMMABLE AND VOLATILE SOLVENTS.KEEP SEALANT AWAY FROM HEAT,SPARKSAND FLAME. USE PROPER PRECAUTIONS WHEN APPLYING THIS SEALANT.
WARNING: AVOID ALL CONTACT OF SEALANT WITH YOUR BODY, ESPECIALLY CONTACTWITH OPEN BREAKS IN THE SKIN. POLYETHYLENE MITTS MUSTBE USED AND HANDS WASHED,BEFOREEATING OR SMOKING.
(a.) PR-1435-Gis a two-part polysulfidesealant which, when mixed, has a short applicationlife (15 minutes at 75°F and 50% relative humidity). For every 10°F rise in temperature,the time is reduced in half. For every 10°F drop in temperature, the time isdoubled. Highhumidity at time of mixing also shortens the application life.
Usingpremeasuredkits, mix the accelerator with the PR-1435-Gbasecompound. The mixing ratio is 7.5 parts base compound to 1 part accelerator by weight. Slowly mix accelerator into base compound by hand until a uniform gray-green color is obtained.
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PA-42-720(AdvancedTrainer)
MAINTENANCEMANUAL
A. Processes(continued)
1. SealingProcedures(continued)
(3.) Listof Materials
(a.) SealantMaterial-PR-1435-G(See91-00-00)
(b.) Solvent-Methylethylketone(MEK)
(c.) AlodineSolution1200
(d.) Smallnylonbrush
(e.) Cleanwhitegauzepads(4inchsquare)
(f.) Filletfairingtools (Referto 91-00-00)
(4.) SealantApplication
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