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SWE > Cleaning and Corrosion Prevention and Control - 1-1-691 > Flashcards

Cleaning and Corrosion Prevention and Control - 1-1-691 Flashcards

1
Q

In sea water the corrosion reaction is accelerated by a factor of __ or more.

A

1,000

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2
Q

__ or __ results from a direct chemical attack on a metal surface and involves only the metal surface.

A

Uniform surface corrosion, etching

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3
Q

__ occurs when different metals are in contact with each other and an electrolyte, such as salt water.

A

Galvanic corrosion

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4
Q

The most common corrosion on aluminum and magnesium alloys is called __.

A

pitting

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5
Q

__ is an attack on the grain boundaries of the metal.

A

Intergranular corrosion

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6
Q

__, is an advanced form of intergranular corrosion where the surface grains of a metal are lifted up by the force of expanding corrosion products occurring at the grain boundaries.

A

Exfoliation

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7
Q

__ corrosion occurs when the electrolyte has a different concentration from one area to another.

A

Crevice

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8
Q

__, is the intergranular or transgranular cracking of a metal caused by the combined effects of constant tensile stress (internal or applied) and corrosion.

A

Stress corrosion cracking

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9
Q

7075-T6 aluminum alloy can fail by stress corrosion cracking when a stress which is only __ of its rated strength is present across the thickness of its metal grains or the short transverse grain direction.

A

10%

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10
Q

__ is the cracking of metals caused by the combined effects of cyclic stress and corrosion and is very similar to stress corrosion cracking.

A

Corrosion fatigue

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11
Q

__, is a special form of oxygen concentration cell

corrosion or crevice corrosion which occurs on metal surfaces having an organic coating system.

A

Filiform corrosion

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12
Q

Filiform occurs when the relative humidity

of the air is between __ and __, and when the surface is slightly acidic.

A

78%, 90%

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13
Q

Filiform corrosion can be prevented by storing equipment and aircraft in an environment with a relative humidity below __.

A

70%

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14
Q

__ is a special form of concentration cell corrosion which occurs in combination with surface wear.

A

Fretting Corrosion

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15
Q

Corrosion in the absence of water that can occur at high temperatures, such as those found in turbine engine compressors and hot sections.

A

High Temperature Oxidation (Hot Corrosion)

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16
Q

__ are the lightest structural metals used for aircraft and missile airframes.

A

Magnesium alloys

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17
Q

Effective sacrificial coatings that prevent corrosion on ferrous alloys are __ or __

A

cadmium plating, low hydrogen embrittling zinc nickel

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18
Q

Titanium and titanium alloys have many uses in aircraft and missiles at temperatures up to __.

A

1,000° F (540° C)

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19
Q

Growth of molds and bacteria is also inhibited by temperatures above __.

A

104° F (40° C)

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20
Q

Normal sea winds carry from __ to __ pounds of sea salt per cubic mile of air.

A

10, 100

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21
Q

During sandstorms small sand particles are often blown as high as __ feet.

A

10,000

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22
Q

Ideal growth conditions for most fungi

and bacteria are temperatures of __ and relative humidities of __ .

A

+68° to +104° F (+20° to +40° C), 85 to 100%.

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23
Q

If using closed-loop water recycling systems for washing aircraft, water shall meet the following requirements and be tested every __ days

A

30

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24
Q

All locations within __ miles of salt water are considered severe and require __ day wash.

A

1.25, 30

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25
Q

Clear water rinsing shall not be accomplished outside

when the temperature is at __ or below.

A

40° F (4° C)

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26
Q

All aircraft stationed within 1.25 miles (2 km) of salt

water require a Clear Water Rinse at least once every __ unless washed first.

A

15 days

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27
Q

Aircraft making two or more take-offs and or/landings, including touch-and-go landings, when the runway approach is under __ require a CWR after the aircraft completes the last flight of the day.

A

3,000 feet and over salt water

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28
Q 
Any aircraft (primarily transient aircraft) performing only a single takeoff and/or landing requiring low-level flight (below 3,000 feet) over salt water in a single day are excluded from CWR unless there are \_\_ or more occurrences within a 30 day
period.
A

ten

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29
Q

Search, rescue, and recovery missions or any other low-level flight operations that require aircraft to operate over salt water at altitudes under 3,000 feet require a CWR after __.

A

the aircraft completes the last flight of the day

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30
Q

To be most effective, cleaning materials are applied full strength with no pre-rinsing of the surface, allowed to dwell __ minutes

A

5 to 15

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31
Q

The dwell time for all types of P-D-680 should be held

to a minimum (__)

A

less than 15 minutes

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32
Q

Steam cleaning __ be used on aircraft and missiles at all levels (Organizational/Unit, Intermediate, or Depot) of maintenance.

A

shall not

33
Q

Use of hot water (__) for rinsing during aircraft washing operations is strongly recommended as it provides much more efficient rinsing and is known to reduce man-hours for aircraft washing operations by approximately __.

A

120° to 140° F/49° to 60° C, 20%

34
Q

Cleaning solution for exterior painted/unpainted/interior surfaces/most exterior surfaces

A

MIL-PRF-87937

35
Q

Cleaning solution for control cables:

A

PRF-680

36
Q

Cleaning solution for landing gear exposed piston:

A

83282

37
Q

Cleaning solution for doors, linkages, cylinders:

A

680

38
Q

Use only __° flat fan spray nozzles. Ensure that the nozzle stand-off distance to the surface is always at least __ inches and never less.

A

40, 12

39
Q

What PSI for portable foam generating cleaning units?

A

30 to 70

40
Q

Dwell time for portable foam generating cleaning units?

A

1 minute

41
Q

During scheduled or unscheduled maintenance actions on aircraft, missiles, or equipment and their components, the area involved as well as those within __ inches (__ inches on each side) of the repair or treatment area shall be visually inspected for corrosion.

A

36, 18

42
Q

If corrosion is suspected, examine the area with a __X

magnifying glass and flashlight.

A

10

43
Q

Light corrosion:

A

1 mil (.001)

44
Q

Moderate corrosion:

A

10 mil (.010)

45
Q

First remove all corrosion visible through a __X magnifying glass, then removing an additional __ to ensure that all deposits have been eliminated.

A

10, two mils (0.0020 inch)

46
Q

Do not use brushes with a bristle wire gauge or diameter above __

A

0.010 inch

47
Q

Keep the sanding disc tilted to approximately a __ degree angle so that only one side of the disc is in contact with the metal surface.

A

10

48
Q

Generally, the coverage rate should be about __. (Sanding)

A

two square feet per minute

49
Q

Do not use flap brushes downto within __ of core.

A

2 inches

50
Q

Do not use __ to remove corrosion from installed fasteners.

A

rotary files

51
Q

Inspect nozzles periodically for wear and discard them when the orifice is worn to a diameter which is __ greater than the diameter when new.

A

50%

52
Q

Blast media used on aircraft and aircraft components shall be tested for contamination or purged every hours of equipment operation

A

80

53
Q

Sheet metal, __ or thinner, shall not be blasted.

A

0.0625 inch (16 gauge, U.S. Standard)

54
Q

Blasting media stream angle?

A

30° to 40°

55
Q

Nozzle distance from surface when blasting?

A

2-6 inches

56
Q

If corrosion has not been removed in a total blasting time of __ seconds on any one specific area, other mechanical methods of removal should be utilized.

A

60

57
Q

Dwell time for aluminum conversion coating?

A

1 - 5 minutes

58
Q

Dwell time for magnesium conversion coating?

A

1 - 3 minutes

59
Q

The area roto-peened shall not be larger than __ inches.

A

3 x 4

60
Q

When using a sealing gun, the nozzle tip must be pointed into the seam and maintained at a __ degree angle to the line of travel

A

45

61
Q

The application life of a sealant is the length of time that a mixed sealing compound remains usable at __ and __% relative humidity (RH).

A

77° F (25° C), 50

62
Q

Do not apply heat to sealants until __ minutes minimum have elapsed at ambient (room) temperature
after application to allow the contained solvents to flash off.

A

30

63
Q

Always __ to avoid contaminating the solvent supply.

A

pour solvent on the cloth

64
Q

The dry film thickness (DFT) of spray sealant coatings shall be in the range of __.

A

3 to 5 mils (0.003 to 0.005 in)

65
Q

For permanent structure, all faying surfaces, seams, and lap joints outside of fuel wet and high temperature
areas shall be protected with __

A

MIL-PRF-81733

66
Q

If, during normal maintenance, it becomes necessary to remove and replace components (wing planks, skin, spar caps, fasteners, fittings, etc.,) they shall be __ when reinstalled, even if they were not sealed originally.

A

sealed

67
Q

When the thickness of metal is reduced by more than 15 mils (0.015 in) in the removal of corrosion damage, fill the depression with __

A

MIL-PRF-81733

68
Q

Sealants shall not be stored in areas where the temperature exceeds __.

A

80° F (27° C)

69
Q

If a sealant has exceeded its original shelf life, then it shall not be used until __.

A

the update testing has been performed

70
Q

Sealants may be extended __ of their original shelf life after passing the required tests.

A

one-half

71
Q

Do not use __ to clean installed

steel control cables.

A

metallic wools

72
Q

Natural and synthetic rubber shall not be __.

A

painted or oiled

73
Q

Engines which are contaminated with small amounts of sea water entering the intake shall be cleaned using __

A

MIL-PRF-85704

74
Q

Cleaning and Corrosion Prevention and Control, Aerospace and Non-Aerospace Equipment

A

1-1-691

75
Q

Cleaning with compressed air can create airborne particles that may enter eyes or penetrate skin. Pressure shall not exceed __.

A

30 PSIG

76
Q

__ materials are specially formulated

to minimize corrosion of aircraft turbine engines.

A

MIL-PRF-85704

77
Q

__ shall not be used to clean bearings

A

Aqueous parts washers

78
Q

__ shall not be applied with atomizing spray equipment.

A

Solvents

SWE (9 decks)

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