Assignment 11 Troubleshooting And Power Plant Inspection Repai And Testing 14008

Front 1

To allow comparison with MIMs
serviceability limits during
borescoping, you should record which
of the following information?

Back 1

Area, magnitude, and direction
of damage

Front 2

Cleaning the engine compressor by
water washing is required before any
borescope inspection so sulfidation
does not hide damage.

Back 2

false

Front 3

Which of the following programs
defines the engine repair
capabilities of an AIMD power plants
section?

Back 3

Gas Turbine Maintenance Program

Front 4

Which of the following conditions
determine the different maintenance
actions for specific engines?

Back 4

Degree of difficulty and
frequency of repair

Front 5

What degree of gas turbine engine
repair, if any, is the same as
complete engine repair (CER)?

Back 5

first

Front 6

Which of the following is a purpose
for cleaning engine parts?

1. Remove sulfidation from turbine blades
2. Prepare surfaces for repair
3. Permit a inspection
4. Each of the above

Back 6

4. Each of the above

Front 7

The selection of cleaning materials
and processes is determined by the
degree of cleanliness required and
nature of soil only.

Back 7

false

Front 8

Which of the following practices
should you follow when steam
cleaning parts?

1. Avoid heat buildup
2. Thoroughly dry all parts after
cleaning
3. Apply a corrosion prevention
compound
4. All of the above

Back 8

4. All of the above

Front 9

Which of the following cleaning
processes would you use to remove
paint and rust?

Back 9

Decarbonizing

Front 10

Cleaning magnesium and steel parts
in the same cleaning tanks could
cause which, if any, of the
following problems?

Back 10

Corrosion damage to magnesium
parts

Front 11

Which of the following is NOT a
reason to mark engine parts?

Back 11

Legibility

Front 12

When using abrasive blasting you may
use only the wet type.

Back 12

false

Front 13

Temporary markings maintain
identification of parts after a
modification to that part.

Back 13

false

Front 14

Marking of hot section components
that are directly exposed to the gas
path may be accomplished using which
of the following items?

Back 14

Layout dye

Front 15

Any temporary marking method that
you use that leaves a heavy carbon
deposit on hot section components
may cause which of the following
types of corrosion?

Back 15

Intergranular

Front 16

Which of the following methods of
marking provides permanent markings?

Back 16

Metal stamp, vibropreen, and
acid-etching

Front 17

Using engine stands and special
fixtures to support the engine
during disassembly and buildup
provides which, if any, of the
following advantages?

Back 17

Prevents stress and allows
proper alignment of parts

Front 18

Nuts and bolts used in the hot
section of an engine are normally of
what type?

Back 18

Special heat–resistant material

Front 19

When a complete replacement of the
entire compressor case is
accomplished, it is also necessary
for you to replace the compressor
rotor.

Back 19

false

Front 20

Growth

Back 20

elongation of the blade

Front 21

Gall

Back 21

transfer of metal to one surface to another

Front 22

Bow

Back 22

bent blade of ragged edge

Front 23

blend

Back 23

smooth repair into the sorrounding contour

Front 24

When, if ever, is the straightening
of bowed compressor vanes
permissible on the inner half of the
blade?

Back 24

never

Front 25

When blending compressor vanes, you
should use which of the following
procedures?

Back 25

Grind/file the blade lengthwise

Front 26

What material should you use to
polish a reworked area to make it
feel like the original?

Back 26

a file

Front 27

At what location is the code letter
stamped on a blade?

Back 27

Next to, but not after, the part
number

Front 28

Compressor stator vanes are blended
to minimize stress that tends to
concentrate in that of the following
areas?

Back 28

Dents, scratches, and cracks

Front 29

When parts of the vane are damaged
beyond maximum repair limits, they
should be sent to which of the
following facilities?

Back 29

Overhaul activity

Front 30

Damage to the tailing edge of hollow
vanes can be blended if what portion
of the weld seam remains after the
repair?

Back 30

1/3

Front 31

Provided there is no indication of
pieces breaking away, cracks are
allowed without repair on what type
of vane?

Back 31

The concave surface of rubberfilled
vanes

Front 32

When inspecting combustion liners,
what, if any, is the maximum
allowable number of air hole cracks
per section (0.125 inch or less)?

Back 32

three

Front 33

When inspecting combustion liners,
what, if any, is the maximum
allowable number of air hole cracks
per section (0.125 inch or less)?

Back 33

crossover tubes

Front 34

Cracks in the combustion chamber
support may be repaired using which
of the following methods?

Back 34

Inert–gas welding

Front 35

Operating turbine blades are more
easily damaged than compressor
blades because turbine blades
operate under which of the following
extreme conditions?

Back 35

Heat

Front 36

High-temperature corrosion known as
sulfidation is caused by the
interaction of what chemical
compounds and elements?

Back 36

Fuel/air mixture, sodium and
sulfur only

Front 37

Sulfidation has a more harmful
effect on compression blades than on
turbine blades.

Back 37

false

Front 38

Which of the following conditions is
considered serious when the turbine
rotor is sulfidated?

1. Splitting
2. Delamination
3. Flaking
4. All of the above

Back 38

all the above

Front 39

When checking for stress rupture
cracks, you should check which of
the following sections on the
turbine blade?

Back 39

Across the leading and trailing
edges at right angles to the
edge length

Front 40

The leading edge of a first-stage
turbine blade of an engine has
stress rupture cracks. Which of the
following conditions is most likely
the cause of the cracks?

Back 40

An overtemperature condition

Front 41

What record would you refer to when
classifying replacement turbine
blades?

Back 41

The turbine rotor disc assembly
service record

Front 42

One hundred percent turbine blade
replacement is allowable provided
the pan weight of the replacement
blades matches the original weight
within what prescribed limit?

Back 42

±1 gram

Front 43

Hot spots found on the exhaust cone
can be attributed to what condition?

1. Improper combustion liner flame control
2. A malfunctioning fuel nozzle
3. Both 1 and 2 above
4. Engine operation at 100% rpm for long periods of time

Back 43

3. Both 1 and 2 above

Front 44

Engine adjustment is best
accomplished during controlled
operation of the engine. Manuals
and procedures are established for
the use of test facilities/test
cells by what authority?

Back 44

NAVAIRSYSCOM

Front 45

Operators of test facilities may be
certified by one of three methods.
Two of these methods are formal
training at NADEP and on–site
training provided by a NAESU
engineer. What is the third method?

Back 45

OJT under the direct supervision
of a certified test stand
operator

Front 46

All test cell operators must hold a
valid support equipment license that
contains which of the following
information?

Back 46

OPNPVINST 4790.2 (series)

Front 47

Engine test cells are equipped to
measure which of the following
parameters?

Back 47

All desired engine operating
parameters

Front 48

The enclosed test facility is
capable of handling how many pounds
of thrust during the engine
performance tests?

Back 48

17,000

Front 49

The enclosed test facility includes
test equipment made up of a total of
how many major assemblies?

Back 49

nine

Front 50

For which of the following reasons
is the variable height stand used
when testing an engine?

1. To support the engine
2. To restrain the engine
3. To position the engine
4. All of the above

Back 50

all the above

Front 51

By what means is the interlock
system started?

Back 51

Electrically, with the 28–volt
dc motor-generator set switch

Front 52

On the control board, when the
toggle is raised, the switch is in
what position?

Back 52

on

Front 53

The two mating pilot lights on the
interlock system indicate the key
switch position. What color light
indicates CLOSED?

Back 53

green

Front 54

Improper sizing and positioning of
the first stage augmenter may result
in which of the following problems?

1. Increase in EGT
2. Loss of thrust
3. Insufficient secondary airflow
4. All of the above

Back 54

all the above

Front 55

The fuel system of the enclosed test
facility is interlocked to the basic
interlock system, to the CO2 fire–
extinguishing system, and to what
other system?

Back 55

Exhaust gas cooling system

Front 56

Initial rotation of an engine during
starting may be accomplished by an
electrically operated starter motor
or what other starting method?

Back 56

Compressed air-operated turbine
starter

Front 57

For complete fire control coverage,
the CO2 system is electrically
linked to the interlock system. By
what means is the system linked to
the main fuel line valve of the
engine fuel supply?

Back 57

pressure conect

Front 58

What is the primary purpose of the
refrigeration system in the CO2 fire
system?

Back 58

To maintain a nominal storage
tank pressure

Front 59

Portable universal engine runup test
systems may be used at any site that
has which of the following
accommodations?

Back 59

adequate tie down

Front 60

At the end of an engine test, the
operator will record the engine
coast-down time. Which of the
following definitions best defines
coast–down time?

Back 60

Time elapsed from fuel cutoff to
complete engine stop

Front 61

Shorter than normal coast-down time
may be caused by which of the
following problems?

Back 61

Compressor rub due to elongated
blades

Front 62

All test cell operators must hold a
valid support equipment license that
contains which of the following
information?

Back 62

A particular engine and engine
test cell