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GENERAL ORALS
CHAPTER 12 - CLEANING AND CORROSION
Question | Answer |
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IS THERE ANY REQUIREMENT FOR CLEANING AND AIRCRAFT PRIOR TO AN ANNUAL OR 100 HOUR INSPECTION? | IT IS NOT ONLY GOOD, COMMON SENSE, BUT IT IS A LEGAL REQUIREMENT AS SPECIFIED IN FAR PART 43, APPENDIX D. |
DISCUSS THE GENERAL PRECAUTIONS THAT SHOULD BE OBSERVED WHEN WASHING AN AIRPLANE. | AVOID OR PROTECT AREAS, WHICH MAY BE DAMAGED OR CONTAMINATED, SUCH AS: PITOT AND STATIC PORTS, HINGES, SEALED AREAS, AND BEARINGS. |
WHAT ARE SOME OF THE MORE COMMON LIGHT-DUTY CLEANING AGENTS? | SOAP OR DETERGENTS AND WATER. |
WHAT MATERIALS ARE COMMONLY USED AS HEAVY DUTY CLEANERS? | SOLVENTS AND EMULSIONS. |
WHAT ARE THE PREFERRED CLEANERS FOR PLASTIC SURFACES SUCH AS WINDSHIELDS? | MILD SOAP AND WATER OR MANUFACTURER APPROVED CLEANER. |
WHAT TYPE OF CLEANING AGENTS SHOULD BE USED TO REMOVE GREASE, OIL, OR FUEL FROM AIRCRAFT TIRES? | SOAP AND WATER. |
GIVE AT LEAST THREE EXAMPLES OF THE FACTORS THAT CAUSE OR INFLUENCE CORROSION. | (1) THE ENVIRONMENTAL CONDITIONS (2) THE PRESENCE OF DISSIMILAR METALS. (3) THE TYPE OF METAL. (4) THE PRESENCE OF ELECTROLYTES AND/OR CONTAMINANTS. (5) THE CONDITION OF PROTECTIVE COATINGS. |
NAME AT LEAST THREE FORMS OF CORROSION. | (1) SURFACE. (2) INTERGRANULAR. (3) FILLIFORM. (4) DISSIMILAR METALS. OR (GALVANIC) (5) OXIDATION. (6) PITTING. (7) STRESS. (8) FRETTING. |
NAME AT LEAST ONE CAUSE OF FILLIFORM CORROSION. | (1) IMPROPER OR INCOMPLETE CURING OF A WASH PRIMER TO PAINTING. (2) FAILURE TO COMPLETELY WASH OFF ACIDIC SURFACE CONTAMINATION. |
WHAT ARE THE VISIBLE SIGNS OF FILLIFORM CORROSION? | BLISTERED PAINT SURFACES, WORM OR THREAD-LIKE TRACKS OR PATTERNS UNDER THE PAINT. |
WHAT ARE THE TWO PRIMARY FACTORS THAT MAY CAUSE DEVELOPMENT OF STRESS CORROSION CRACKS? | A CORROSIVE ENVIRONMENT AND SUSTAINED TENSILE STRESS. |
WHAT ARE VISIBLE SIGNS OF FRETTING CORROSION? | THE CORROSION RESIDUE HAS A DARK, SMOKEY APPEARANCE AND OFTEN APPEARS AROUND AND STREAMING BACK FROM RIVET HEADS. |
WHY ARE PIANO-TYPE HINGES PRIME SPOTS FOR CORROSION? | THE STEEL PIN AND ALUMINUM HINGE MATERIAL ARE DISSIMILAR METALS AND THE HINGE DESIGN TENDS TO TRAP MOISTURE AND CONTAMINANTS. |
WHAT IS THE BEST WAY TO PROTECT PIANO HINGES FROM CORROSION? | KEEP THEM CLEAN AND PROPERLY LUBRICATED. |
PROVIDE AT LEAST FOUR EXAMPLES OF PROCEDURES USED TO PREVENT CORROSION. | (1) CLEANING (2) LUBRICATION (3) TREATMENT (4) SEALING (5) INSPECTION (6) INSTALLING PROTECTIVE COVERS (7) KEEPING DRAIN HOLES FREE AND CLEAR |
DESCRIBE THE TOOLS THAT SHOULD BE USED TO REMOVE CORROSION FROM ANODIZED ALUMINUM SURFACES. | NYLON SCRUBBER PADS SUACH AS SCOTCH-BRITE, BRISTLE BRUSHES, ALUMINUM WOOL OR ALUMINUM WIRE BRUSHES. |
DESCRIBE THE EFFECTS OF USING STEEL BRUSHES OR STEEL WOOL TO REMOVE CORROSION FROM ALUMINUM SURFACES. | STEEL BRUSHES OR STEEL WOOL MUST NOT BE USED TO CLEAN ALUMINUM BECAUSE STEEL PARTICLES CAN BECOME EMBEDDED IN THE ALUMINUM AND CAUSE CORROSION. |
WHAT IS THE PURPOSE OF ALODINE? | ALODINE IS A CHEMICAL PROCESS THAT DEPOSITS A PROTECTIVE FILM ON ALUMINUM ALLOYS. THE FILM IMPROVES CORROSION RESISTANCE AND PAINT ADHESION. |
FOR WHAT REASON SHOULD YOU AVOID CLEANING ANODIZED ALUMINUM SURFACES WITH ALUMINUM METAL POLISH? | ALUMINUM METAL POLISH SHOULD NOT BE USED ON ANODIZED ALUMINUM SURFACES BECAUSE IT WILL REMOVE THE PROTECTIVE COATING. |
WHY SHOULD AIRCRAFT FABRICS AND PLASTICS BE CLEANED ONLY WITH RECOMMENDED CLEANERS? | RECOMMENDED CLEANERS CAUSE THE LEAST AMOUNT OF DETERIORATION OR DAMAGE. |
LIST AT LEAST FIVE (5) EXAMPLES OF AREAS IN AN AIRCRAFT THAT ARE PRONE TO CORROSION. | (1) BATTERY COMPARTMENTS (2) EXHAUST TRAIL AREAS (3) BILGE AREAS (4) VENT AREAS (5) LANDING GEAR & WHEEL WELLS (6) FUEL TANKS (7) WING FLAP RECESSES (8) AROUND & BELOW GALLEYS & LAVATORIES (9) PIANO HINGES (10) ANY AREA THAT CAN TRAP WATER |