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153 Cards in this Set

  • Front
  • Back
How does corrosion endanger aircraft or reduce the margin of safety?
Corrosion reduces the strength and changes the mechanical characteristics of the material.
All maintenance personnel must be formally trained in what program?
Corrosion control.
What is the primary factor to consider when selecting materials for constructing an aircraft?
Weight-to-strength ratio.
The decay of metals as they combine with oxygen is known as what type of corrosion?
Metal corrosion.
What does an intact coat of paint provide to naval aircraft?
Protection from corrosive environments.
In an electrochemical attack, electron flow is established in which direction?
Electron flow is established from the anode to the cathode.
How will heat, humidity, and moisture affect the electrochemical reactions that cause metal to corrode?
They speed the corrosion process.
Why are thick structural sections most susceptible to corrosive attack?
Thick sections are more likely to have variations in their composition, particularly if heat-treated during fabrication.
In relation to corrosion, what affect does moisture have on avionics equipment?
Moisture is the single largest contributor to avionics corrosion.
Which NAVAIR publication is entitled Aircraft Weapons Systems Cleaning and Corrosion Control?
NAVAIR 01-1A-509.
NAVAIR 16-1-540 provides what information?
NAVAIR 16-1-540 provides information on cleaning and corrosion prevention and control of avionics equipment.
Information on the preservation of Naval aircraft and aircraft engines can be found in what publication?
NAVAIR 15-01-500, Preservation of Naval Aircraft.
What information can you find in NAVAIR 01-IA-507?
General uses for cements, sealants, and coatings.
At a minimum, how often must aircraft be cleaned?
Every 14 days.
What should happen to a good corrosion preventive program when carrier-based aircraft return to a shore activity after a deployment?
A period of intensive care should follow the deployment cycle to bring the aircraft back up to standard.
Operating units that have the best safety records, maximum use of aircraft, and lowest operating costs will also have what program?
A good corrosion prevention program.
What must be done on a daily basis with unpainted aircraft surfaces and actuating rods?
They must be cleaned or wiped down.
What are the most serious hazards in handling, using, and storing aircraft cleaning materials?
Flammability and toxicity
Why is there a requirement to use a respirator when working with solvents?
Inhaling toxic vapors can seriously affect the brain and central nervous system.
What must be done specifically when storing solvents that contain more than 24% chlorinated materials?
They must be kept in specially marked containers.
Where must flammable liquids be stored when not in use?
In a separate building or-flammable liquids storeroom.
By what four means is dry-cleaning solvent applied?
It is applied by spraying, dipping, brushing, or wiping.
Safety solvent is currently referred to by what name?
1,1,1-trichloroethane.
What material must be avoided as a substitute to aluminum oxide abrasive cloth and why?
Silicon carbide paper because it is sharp and the individual grains can penetrate steel surfaces.
Why is the conformable applicator cleaning pad better than a mop or bristle brush when cleaning aircraft surfaces?
Because it conforms to the surface, the applicator allows easier application of a constant scrubbing pressure on curved skin panels.
Types I, II, and IV of what cleaning compound are to be used on tactical paint schemes?
MIL-C-85570.
What is the first step in efficiently cleaning an aircraft?
Select the proper cleaning agent for the method of cleaning chosen.
When cleaning an aircraft what are the two directions in which cleaning compound and rinsing are applied?
Upward and outward.
What substance may be used to spot-clean lightly soiled areas?
Dry-cleaning solvent.
Why should dry-cleaning solvent not be used in oxygen areas or around oxygen equipment?
It is not oxygen compatible and will cause explosion or fire.
In emergencies when regular waterproof canvas covers are not available, what materials can you use as covers and shrouds?
A polyethylene sheet, polyethylene-coated cloth, or metal foil barrier materials.
The ground handling requirements for an aircraft can be found in what publication?
The maintenance instructions manual (MIM).
What technical publication covers emergency reclamation procedures for naval aircraft?
NAVAIR 01-1A-509.
State the levels and terms of preservation used for naval aircraft.
Level I—Short term, up to 90 days.
Level II—Mid-term, up to 1 year.
Level III—Long term, indefinitely.
Corrosion-preventive petroleum, class 3, provides protection for what type of surfaces?
Antifriction bearings, shock-strut pistons, and other bright metal surfaces.
What level of preservation is required if an aircraft is scheduled to remain idle for more than 14 days but less than 90 days?
Level I preservation.
MIL-C-16173, corrosion preventive compound, is available in three grades. Which grade(s) is/are easily removed with dry-cleaning solvent?
All three. Grades I, II and IV.
When is general-purpose lubrication oil VV-L-800 used?
It is used when a water-displacing, low temperature, lubricating oil is required.
What type of corrosion-preventive compound MIL-C-81309 is used on avionics and electrical equipment?
Type III.
What level of engine preservation requires the fuel system to remain at least 95 percent full of fuel for a period not to exceed 90 days?
Level I.
What technical corrosion manual should you use for support equipment?
Ground Support Equipment Cleaning and Corrosion Control, NAVAIR 17-1-125.
What are the two sealants recommended for use on support equipment?
Silicone sealant MIL-A-46146, type I, and
Polysulfide sealant MIL-S-81733 or MIL-S-8802.
The tarnishing of silver is a common example of what type of corrosion?
Uniform or direct surface attack
Pitting is the most common effect of corrosion on what alloys?
Aluminum and magnesium alloys.
Pitting corrosion is first noticeable as what color deposit on a metal surface?
White or gray powdery deposit.
How can concentration cell corrosion be controlled or even prevented?
Avoid the creation of crevices during repair work.
Define inter-granular corrosion.
Inter-granular corrosion is an attack on the grain boundaries of alloys under specific conditions.
What is usually the cause of dissimilar metal corrosion?
It is usually the result of faulty design or improper maintenance practices.
What are some examples of internal stress corrosion?
Stress induced by press-and-shrink fits and those in rivets and bolts.
What causes fatigue corrosion?
Fatigue corrosion is caused by the combined effect of corrosion and stress applied in cycles to a component.
What is the cause of fretting corrosion?
A slight vibration, friction, or slippage between two contacting surfaces that are under stress or heavy load.
Filiform corrosion occurs on what types of metals?
Steel, aluminum, and magnesium.
The corrosion-prone areas for each specific aircraft are detailed in what publication?
Applicable periodic maintenance information cards (PMICs).
What are the three requirements for a corrosion cell to form?
A cathode, an anode, and an electrolyte.
Cockpit fasteners should be touched up with what color paint?
Black paint to prevent glare.
In water entrapment areas of an aircraft, drains are required to be inspected how often?
Daily.
What publication should you refer to for information about structural corrosion?
NAVAIR 01-1A-509.
Hydrated ferric oxide is commonly known as what kind of corrosion?
Iron rust.
What are the three types of aluminum surfaces insofar as corrosion removal is concerned?
Clad, anodized, and exfoliated.
How should you remove corrosion from clad aluminum surfaces?
Hand polish the corroded areas with MIL-P-6888 metal polish.
What is the primary type of aluminum used on naval aircraft?
Non-clad aluminum alloys.
What are the approved tools for cleaning anodized aluminum surfaces?
Aluminum wool or fiber bristle brushes.
Who should evaluate any loss of structural strength in critical areas of an aircraft?
An aeronautical engineer.
What manual should you refer to for tolerance limits for dimensions of critical structural members?
Structural repair manuals for the specific aircraft model.
Where is titanium most often used on a aircraft?
In the engine exhaust areas.
Copper and copper-based alloys are used in avionic systems for what applications?
Contacts, springs, connectors, printed circuit board runs, and wires.
What must you do before starting corrosion removal?
Conduct an inspection and evaluation of the suspected area.
How should you remove moderate corrosion?
Extensive hand sanding or light mechanical sanding.
What is the most desirable method of mechanical corrosion removal?
VACU-Blast dry honing portable machine.
What is the preferred surface preparation method for many of the components of support equipment?
Abrasive or grit blasting.
What should you use during the abrasive process to prevent flash rusting?
Sodium Nitrite MIL-S-24521.
Information regarding corrosion removal limitations can be found in what publications?
The applicable aircraft Structural Repair Manual (SRM) or the “Corrosion” section of the Maintenance Instruction Manual (MIM)
What is the purpose for chemically treating a surface for painting?
Chemical conversion coatings increase a surfaces resistance to corrosion and improve paint bonding to the surface.
When failure of the coating occurs, you should remove corrosion and touch up the bare magnesium with what chemical treatment solution?
MIL-M-3171.
What is the primary purpose of any paint finish?
The protection of the exposed surfaces against decay.
When using paint removers, you should wear what type of protective clothing?
You should wear eye protection, gloves, and a rubber apron.
What safety precaution must be taken before cleaning and stripping old finishes on aircraft?
Ensure the aircraft is properly grounded.
What type of motor should you use to power a flap brush?
Use a NO LOAD 3200 rpm pneumatic drill motor.
Complete information on the types and applications of aircraft paint systems is contained in what publication?
NAVAIR 01-1A-509.
After it is mixed, the storage life of epoxy-polyamide primer is limited to the amount that can be used in how many hours?
4 hours.
What is the standard, general-purpose, exterior protective coating for aircraft surfaces?
Aliphatic polyurethane, MIL-C-85285.
What are the two classes of spray guns?
Suction feed and pressure-feed spray guns.
When flammable materials are used, all sources of ignition must be at least how far away from the work location?
50 feet.
What is the greatest threat to the structural integrity of an aircraft?
Metal corrosion
Corrosion is detrimental to the integrity of an aircraft. It alters the structure of the materials that make up the aircraft in what manner?
Reduction in strength and change in mechanical characteristics
The materials used in the construction of an aircraft are chosen according to what characteristics?
Weight-to-strength ratio
Metal corrosion is defined as the deterioration of metal as it combines with which of the following elements?
Oxygen
On naval aircraft, what materials are used most often to separate susceptible alloys from the corrosive environment?
Paints
Which of the following is a description of the flow of electrons during electrochemical attack of a metal?
Electrons flow from the cathodic area to the anodic area, resulting in the deterioration of the anodic area
Which conditions affect the rate at which electrochemical reactions cause metals to corrode?
Heat, humidity, and moisture
Because of variations in their composition, which of the following aircraft surfaces is the most susceptible to corrosive attack?
Thick structural surfaces
Which of the following conditions is the single greatest contributor to avionics corrosion?
Moisture
Which of the following publications provides information on aircraft corrosion control for organizational-level maintenance?
NAVAIR 01-1A-509
Which of the following publications provides information on aircraft cleaning?
NAVAIR 01-1A-509
Which of the following publications provides information on avionics cleaning and corrosion prevention and control?
NAVAIR 16-l-540
Which of the following publications provides information on the preservation of aircraft engines?
NAVAIR 15-01-500
Which of the following publications provides information on the preservation of naval aircraft?
NAVAIR 15-01-500
Which of the following publications provides information on the general use of cements, sealants, and coatings used on aircraft?
NAVAIR 01-1A-507
When carrier-based aircraft are transferred to shore activities, what happens to the scope of most corrosion preventive programs?
It decreases
Normally, aircraft squadrons with the best corrosion preventive programs have which of the following benefits?
The best safety records
The most use of the aircraft
The lowest operating costs
As directed by NAVAIR, aircraft deployed aboard an aircraft carrier will be washed and cleaned a minimum of how often?
Every 14 days
Mandatory aircraft cleaning is always required after an aircraft is exposed to which of the following substances?
Fire-extinguishing materials
Unpainted surface of struts and actuating cylinder rods should be cleaned or wiped down at what prescribed interval?
Daily
When handling, using, and storing aircraft cleaning materials, what is/are the most serious hazard(s) you will meet?
Flammability and toxicity
When using hazardous chemicals, you should wear which of the following protective devices?
Gloves and aprons, a face shield, and an approved respirator
Solvents must be kept in specially marked containers if they contain more than what percent by volume of chlorinated materials?
24%
When volatile and flammable materials are not being used, they should be stored in which of the following areas?
Inside a separate building or flammable liquids storeroom
What solvent is generally used as an all-purpose cleaner in naval aviation maintenance?
Dry-cleaning solvent
Which solvent is an alternate compound for cleaning acrylics?
Aliphatic naphtha
Safety solvent is intended for use when a high flash point is required. You should NOT use safety solvent to clean which of the following areas of an aircraft?
Oxygen systems
To neutralize the effects of urine and waste products in the lavatories of aircraft, you should use which of the following cleaning agents?
Ammonium hydroxide or sodium bicarbonate
In an intermediate maintenance activity, an avionics/electrical maintenance branch that operates a “clean room” should use what type of MIL-C-81302 Freon cleaner?
MIL-C-81302, Type I
To produce a high-luster, long-lasting polish on an unpainted aluminum clad surface, you should use what mechanical cleaner?
Aluminum metal polish
Which of the following devices should you use to perform a fast and economical cleaning of an aircraft?
Conformable applicators
There are several steps that you must take before you can actually clean an aircraft. Which of the steps listed below is the first one you should take?
Select the correct cleaning agent for the method of cleaning that you will use
Which of the following cleaning compounds should be used to clean an aircraft that is painted with the tactical paint system?
MIL-C-85570
To ensure complete cleaning and rinsing of all aircraft surfaces, you should use which of the following washing sequences?
Underside of wings, fuselage, and tail, spraying water from the wing tips and fuselage ends, inboard to outboard, followed by the same sequence on the upper surfaces.
Surfaces that are lightly soiled with oil may be spot-cleaned by wiping them with which substance?
Dry-cleaning solvent
In an emergency when an aircraft is without a regular waterproof canvas cover, suitable covering and shrouding may be accomplished by the use of which materials?
Polyethylene sheet, polyethylene coated cloth, and metal foil barrier material
Where should you place the cowling and access panels when they are removed during a maintenance task?
On a pad or secure them to the aircraft
The size and composition of an emergency reclamation team is determined by what criteria?
Urgency of the situation
Under which of the following conditions is an aircraft most susceptible to a corrosive attack?
When it is not being flown or when it is in shipment
How many levels of preservation methods are used on naval aircraft?
Three
Level III preservation is used to preserve aircraft for what situation?
Long-term storage
Level I preservation should be applied to an aircraft when it is out-of-service for more than what minimum number of days?
14 days
Which aircraft-specific publication contains the requirements for Level I preservation?
Special MRCs
Which of the following is the main disadvantage of grade IV corrosion preventive compound (paralketone)?
It is easily removed by water spray
What preservative compound should be used to provide protection for shock struts?
Preservative hydraulic oil, MIL-H-46170
Piano-wire hinges require lubricating and corrosion protection. What water displacing, low-temperature, lubricating oil should you use?
Lubricating oil, general-purpose, preservative, VV-L-800
You should use corrosion preventive compound MIL-C-81309, type III, on which of the following equipment?
Avionic and electrical equipment
Which of the following is a laminated metal-foil material used for the protection of acrylics during cleaning?
Water vaporproof barrier material
You should check for corrosion and deterioration during which of the following routine inspections?
Daily, phase, and postflight
Corrosion may occur in several forms, depending on which of the following factors?
Metal involved,
Atmospheric conditions,
Corrosion-producing agents present
What type of corrosion forms threadlike filaments under organic substances (such as paint film).
Filiform corrosion
Fungus growths on the sealing materials of integral fuel tanks are what type of corrosion?
Microbiological corrosion
What type of corrosion is caused by slipping movement between two mating metal surfaces?
Fretting corrosion
What type of corrosion results in uniform etching of the metal surfaces?
Direct surface attack corrosion.
What type of corrosion forms shallow indentations or deep cavities of small diameter on metal surfaces?
Pitting corrosion
What type of corrosion is caused by the difference in concentration of the electrolyte or the active metal on the anode and cathode.
Crevice attack
What ype of corrosion results in corrosive attack along the grain boundaries of a metal alloy?
Intergranular corrosion
Metal fractures caused by the combined effects of corrosion and stress applied in cycles to a part are what type of corrosion?
Fatigue corrosion
What type of corrosion is caused by dissimilar metals in contact in a corrosive medium, such as salt water?
Galvanic corrosion
What type of corrosion results in lifting up of the metal surface caused by the force of expanding corrosion products occurring at the grain boundaries just below the metal surface.
Exfoliation corrosion
To identify all the corrosion-prone areas of your squadron’s aircraft, you should refer to which of the following publications?
Applicable periodic maintenance information cards (PMICS)
When avionic and structural corrosion is compared, which of the following effects is the main difference between avionic and structural corrosion?
Small amounts of corrosion can make avionic systems inoperable
Before performing any maintenance on avionic or electrical systems, you should make sure that you have completed which of the following actions?
Secure all external electrical power
What type of corrosion is usually found around electrical bonding and grounding straps?
Galvanic
You are inspecting an aircraft ejection seat. It is very important that even the slightest indication of corrosion be found for which of the following reasons?
Corrosion can weaken the structural soundness of the seat
Slight amounts may indicate problems that are not visible
Slight amounts may cause the seat to be inoperable
When inspecting engine frontal areas and cooling air vents, what types of discrepancies are you likely to find?
Dirt, dust, gravel, and rain erosion
One corrosion-prone area of an aircraft is the bilge area. What condition is the best insurance against corrosion in this area?
A clean, dry bilge area
What are the two purposes of chemically treating a surface after the removal of corrosion products?
To increase the surfaces resistance to corrosion
To improve the paint bond to the surface
True or False. The dry honing machine may be used on any aircraft skin or surface.
False.
What are corrosion damage limits?
Corrosion damage limits refer to the amount of metal that may be removed from a corroded part without impairing the strength and function of the part.