Materials and Processes and Ground Operations and Servicing Flashcards
1
Q
Magnetic particle inspection is used primarily to detect
A
flaws on or near the surface
2
Q
What are the visual indications when identifying stress fractures with magnetic particles testing?
A
Very fine, sharp lines will not buildup as a result of flaw depth
3
Q
Liquid penetrant inspection method may be used on which of the following?
2. Ferrous metals
3. Non-ferrous metals
5. Non-porous plastics
A
2, 3, 5
4
Q
Which of these nondestructive testing methods is suitable for the inspection of most petals, plastics and ceramics for surface and subsurface defects?
A
Ultrasonic inspection
5
Q
Which of the following defects are not acceptable for metal lines?
A
Dents in straight section that are 20% of tube diameter
6
Q
What non-destructive testing method requires little or no part preparation, is used to detect surface or near-surface defects in most metals, and may also be used to separate metals or alloys and their heat treat conditions?
A
Eddy current inspection
7
Q
What method of magnetic particle inspection is used most often to inspect aircraft parts for invisible cracks and other defects?
A
Continuous
8
Q
How many of these factors are considered essential knowledge for x ray exposure?
A
Material thickness and density and the type of defect being detected
9
Q
The testing medium that is generally used in magnetic particle inspection utilities ferromagnetic material that has
A
high permeability and low retentivity
10
Q
Which statement relating to the residual magnetizing inspection method is true?
A
It may be used only with steels which have been heat treated for stressed applications
11
Q
A mechanic has completed a bonded honeycomb repair using the potted compound repair technique. What non-destructive testing method is used to determine the soundness of the repair after the repair has cured?
A
Metallic ring test
12
Q
What two types of indicating medium are available for magnetic particle inspection?
A
Wet and dry process materials
13
Q
Which of the following materials may be inspected using the magnetic particle inspection method?
A
Iron alloys
14
Q
One way a part may be demagnetized after magnetic particle inspection is by
A
slowly moving the part out of an AC magnetic field of sufficient strength
15
Q
Which type of crack can be detected by magnetic particle inspection using either circular or longitudinal magnetization?
A
45 degrees
16
Q
Which of the following methods may be suitable to use to detect cracks open to the surface in aluminum forgings and castings?
A
Dye penetrant inspection and eddy current inspection
17
Q
To detect a minute crack using dye penetrant inspection usually requires
A
a longer-than-normal penetrating time
18
Q
Which of the following is a main determinant of the dwell time to use when conducting a dye or fluorescent penetrant inspection?
A
The size and shape of discontinuities being looked for
19
Q
When checking an item with the magnetic particle inspection method, circular and longitudinal magnetization should be used to
A
reveal all possible defects
20
Q
In magnetic particle inspection, a flaw that is perpendicular to the magnetic field flux generally causes
A
a large disruption in the magnetic field
21
Q
If dye penetrant inspection indications are not sharp and clear, the most probable cause is that the part
A
was not thoroughly was before developer was applied
22
Q
- An aircraft part may be demagnetizing by subjecting it to a magnetizing force from alternating current that is gradually reduced in strength.
- An aircraft part may be demagnetized by subjecting it to a magnetizing force from direct current that is alternately reversed in direction and gradually reduced in strength
A
Both No.1 and No.2 are true
23
Q
The pattern for an inclusion is a magnetic particle buildup forming
A
parallel lines
24
Q
A part which is being prepared for dye penetrant inspection should be cleaned with
A
a volatile petroleum base solvent
25
Under magnetic particle inspection, a part will be identified as having a fatigue crack under which condition?
The discontinuity is found in a highly stressed area of the part
26
In performing a dye penetrant inspection, the developer
acts as a blotter to produce a visible indication
27
What defects will be detected by magnetizing a part using continuous longitudinal magnetization with a cable?
Defects perpendicular to the long axis of the part
28
Circular magnetization of a part can be used to detect which defects?
Defects parallel to the long axis of the part
29
1. In nondestructive testing, a discontinuity may be defined as an interruption in the normal physical structure or configuration of a part
2. A discontinuity may or may not affect the usefulness of a part
Both No.1 and No.2 are true
30
What type of corrosion may attack the grain boundaries of aluminum alloys when the heat treatment process has been improperly accomplished?
Intergranular
31
Which of the following describe the effects of annealing steel and aluminum alloys?
Decreases internal stresses and softening the metal
32
Which heat treating process of metal produces a hard, wear-resistant surface over a strong, tough core?
Case hardening
33
Which heat-treating operation would be performed when the surface of the metal is changed chemically by introducing a high carbide or nitride content?
Case hardening
34
Normalizing is a process of heat treating
Iron-base metals only
35
Which of the following occurs when a mechanical force, such as rolling, hammering, or bending is repeatedly applied to most metals at room temperature?
The metals become strain or work hardened or cold worked
36
The reheating of a heat treated metal such with a welding torch
can significantly alter a metals properties in the reheated area
37
Why is steel tempered after being hardened?
To relieve its internal stresses and reduce its brittleness
38
What aluminum alloy designations indicate that the metal has received no hardening or tempering treatment?
3003-F
39
Which material cannot be heat treated repeatedly without harmful effects?
Clad aluminum alloy
40
What is descriptive of the annealing process of steel during and after it has been annealed?
Slow cooling; low strength
41
Torque values for aircraft bolts normally consider
the threads to be clean and dry
42
What is generally used in construction of aircraft exhaust collectors, stacks and manifolds?
Stainless steel
43
What metal has special short time heat properties and is sued in the construction of aircraft firewalls?
Titanium alloys
44
Unless otherwise specified or required, aircraft bolts should be installed so that the bolt head is
upward or in a forward direction
45
Alclad is a metal consisting of
pure aluminum surface layers on an aluminum alloy core
46
A fibre type, self locking nut must never be used on an aircraft if the bolt is
subject to rotation
47
Self-locking nut may be used on aircraft provided that
the bolt or nut is not subject to rotation
48
The Society of Automotive Engineers (SAE) and the American Iron and Steel Institute use a numerical index system to identify the composition of various steels. In the number '4130' designating chromium molybdenum steel, the first digit indicates the
basic alloying element
49
Aircraft bolts with a cross or asterisk marked on the bolt head are
standard steel bolts
50
Which statement regarding aircraft bolts is correct?
In general, bolt grip lengths should equal the material thickness
51
Generally speaking, bolt grip length should be
equal to the thickness of the material which is fastened together
52
When the specific torque value for nuts is not given, where can the recommended torque values be found?
AC 43.13-1B
53
A particular component is attached to the aircraft structure by the use of an aircraft bolt and castle tension nut combination. If the cotter pin hole does not align within the recommended torque range, the acceptable practice is to
change washers and try again
54
A bolt with a single raised dash on the head is classified as an
AN corrosion resistant steel bolt
55
How is a clevis bolt used with a fork end cable terminal secured?
With a shear nut tightened to a snug fit, but with no strain imposed on the fork and safetied with a cotter pin
56
Where is an AN clevis bolt used in an airplane?
Only for shear load application
57
A bolt with an X inside a triangle in the head is classified as an
NAS close tolerance bolt
58
The core material of Alclad 2024-T4 is
heat treated aluminum alloy, and the surface material is commercially pure aluminum
59
The aluminum code 1100 identifies what type of aluminum?
99 percent commercially pure aluminum
60
Aircraft bolts are usually manufactured with a
Class 3 fit for the threads
61
In the four digit aluminum index system number 2024, the first digit indicates
The majoring alloying element
62
How is the locking feature of the fibre type locknut obtained?
By the use of an unthreaded locking insert
63
Why should an aircraft maintenance technician be familiar with weld nomenclature?
In order to gain familiarity with the welding technique, filler material, and temperature range used
64
Why is it considered good practice to normalise a part after welding?
To relieve internal stresses developed within the base metal
65
What materials do you normalize?
Ferrous
66
Holes and a few projecting globules are found in a weld. What action should be taken?
Remove all the old weld and reweld the joint
67
What would leftover weld be called?
Leg
68
Which condition indicated a part has cooled too quickly after being welded?
Cracking adjacent to the weld
69
Select a characteristic of a good gas weld
The weld should taper off smoothly into the base metal
70
One characteristic of a good weld is that no oxide should be formed on the base metal at a distance from the weld of more than
1/2 inch
71
In examining and evaluating a welded joint, a mechanic should be familiar with
likely ambient exposure conditions and intended use of the part, along with the type of weld and original part material composition
72
On a fillet weld, penetration requirement include what percentage of the base thickness?
25 to 50 percent
73
Which tool can be used to measure the alignment of a rotor shaft or the plane of rotation of a disk?
Dial indicator
74
Identify the correct statement
Dividers do not provide a reading when used as a measuring device
75
Which tool is used to measure the clearance between a surface plate and a relatively narrow surface being checked for flatness?
Thickness gauge
76
Which number represents the vernier scale graduation of a micrometer?
.0001
77
What numerican weight does the number 5 represent in 64,592?
100
78
Which tool is used to find the centre of a shaft or other cylindrical work?
Combination set
79
If it is necessary to accurately measure the diameter of a hole approximately 1/4 in diameter, the mechanic should use a
small hole gauge and determine the size of the hole by taking a micrometer reading of the ball end of the gauge
80
What tool is generally used to set a divider to an exact dimension?
Machinist scale
81
What tool is generally used to calibrate a micrometer or check its accuracy?
Gauge block
82
What precision measuring tool is used for measuring crank pin and main bearing journals for out of round wear?
Micrometer caliper
83
The side clearances of piston rings are measured with a
thickness gauge
84
How can the dimensional inspection of a bearing in a rocker arm be accomplished?
Telescopic gauge and micrometer
85
The twist of a connecting rod is checked by installing push-fit arbors in both ends, supported by parallel steel bars on a surface plate. Measurements are taken between the arbor and the parallel bar with a
thickness gauge
86
The clearance between the piston rings and the ring lands is measured with a
Thickness gauge
87
What may be used to check the stem on a poppet-type valve for stretch?
Micrometer
88
What tool can be used to determine piston pin out-of-round wear?
Micrometer caliper
89
During starting of a turbine powerplant using a compressed air start, a hung start occured. Select the proper procedure
Shut off the fuel
90
A hung start in a get engine is often caused by
the start cutting off too soon
91
Which statement below reflects a typical requirement when towing some aircraft?
If the aircraft has a steerable nosewheel, the torque-link should be set to full swivel
92
Which statement is/are true regarding tiedown of small aircraft?
Nylon or dacron rope is preferred over manilla rope
93
When approaching the front of a idling engine, the hazards area extends forward of the engine approximately?
25 feet
94
Which of the following is the most satisfactory extinguishing agent for use on carburetor or intake fire?
Carbon dioxide
95
If a radial engine has been shutdown for more than 30 mins, the propellor should be rotated through at least two revolutions to
check for hydraulic lock
96
The priming of a fuel injected horizontally opposed engine is accomplished by placing the fuel control lever in the
FULL-RICH position
97
The most important condition to be monitored during start after fuel flow begins in a turbine engine is the
EGT, TIT or ITT
98
Which of the following conditions has the most potential for causing engine damage when starting or attempting to start a turbine engine?
Hot start
99
How is a flooded engine, equipped with a float type carburetor, cleared of excessive fuel?
Crank the engine with the starter or by hand, with the mixture control in cutoff, ignition switch off and the throttle fully open, until the fuel charge has been cleared
100
Generally when an induction fire occurs during starting of a reciprocating engine, the first course of action should be to
continue cranking to start the engine if possible
101
If a fire develops in an engine during the start procedure, you should
continue cranking to start the engine and extinguish the fire
102
When starting and ground operating an aircraft's engine, the aircraft should be positioned to head into the wind primarily
For engine cooling purposes
103
When approaching the rear of an idling turbojet engine, the hazard are extends aft of the engine approximately?
100 feet
104
If a hot start occurs during starting of a turbojet power plant, what is the likely cause?
The fuel/air mixture was excessively rich
105
What effect will aviation gasoline mixed with jet fuel have on turbine engine?
The tetraethyl lead in the gasoline forms deposit on the turbine blades
106
1. Jet fuel is of higher viscosity than aviation gasoline and therefore holds contaminants better
Only No.1 is true
107
When towing a large aircraft
a person should be in the cockpit to operate brakes
108
Weathervaning tendency is greatest when taxiing
a tail-wheel-type airplane in a direct crosswind
109
When taxiing an airplane with a quartering tailwind, the elevators and
upwind aileron should be held in the down position
110
When taxiing (or towing) an aircraft, a flashing red light from the control tower means
move clear of the runway/taxiway immediately
111
A person should approach or leave a helicopter in the pilot field of vision whenever the engine is running to avoid
the tail rotor
112
In the fully articulated rotor system, the blades are attached to the hub with multiple hinges. How are the blades hinged?
They are hinged in a way that allows them to move up or down, and fore and aft
113
When taxiing (or towing) an aircraft, a flashing white light from the control tower means
return to starting point
114
When taxiing (or towing) an aircraft, a alternating red and green light from the control tower means
OK to proceed but use extreme caution
115
When stopping a nose-wheel type airplane after taxiing, the nosewheel should be left
pointed straight ahead
116
When first starting to move an aircraft while taxiing, it is important to
Test the brakes
117
The color of 1100L fuel is
Blue
118
How are aviation fuels, which possess greater antiknock quantities than 100 octane, classified?
By performance numbers
119
Why is ethylene dibromide added to aviation gasoline?
To scavenge lead oxide from the cylinder combustion chambers
120
Both gasoline and kerosene have certain advantages for use as turbine fuel. Which statement is true in reference to the advantages of each?
Kerosene has a higher heat energy per unit volume than gasoline
121
What must accompany fuel vaporization?
An absorption of heat
122
Characteristics of detonations are
rapid rise in cylinder pressure, excessive cylinder head temperature, and a decrease in engine power
123
A fuel that vaporizes too readily may cause
Vapor lock
124
A fuel that does not vaporize readily enough can cause
hard starting
125
Jet fuel number identifiers are
type numbers and have no relation to the fuels performance in the aircrafts engine
126
The main differences between grades 100 and 100LL are
lead content and color
127
Characteristics of aviation gasoline are
high heat value, high volatility
128
Tetraethyl lead is added to aviation gasoline to
improve the gasoline's performance in the engine
129
A fuel that does not vaporize readily enough can cause
hard starting
