Jet Aircraft Engine Lubrication Systems Assignment 6 14008 Aviation Machinist’S Mate 3 & 2

Front 1

Oil itself is the source of which of
the following types of
contamination?

Back 1

Carbon

Front 2

Which of the following conditions
causes fuel to flow into an oil
system?

Back 2

A ruptured fuel–oil cooler

Front 3

Synthetic oils have a shelf life for
which of the following reasons?

Back 3

Old oil will cloud or form
contaminants

Front 4

What is the NATO number for the
primary oil used in jet engines?

Back 4

0-156

Front 5

In the wet–sump lubrication system,
oil is stored in an oil tank BEFORE
being cooled.

Back 5

False

Front 6

Which of the following lubrication
systems are you most likely to
encounter in the fleet?

Back 6

Dry–sump

Front 7

Which of the following components is
found on dry–sump lubrication
systems but usually not on wet-sump
systems?

Back 7

Oil cooler

Front 8

Which of the following statements is
NOT true concerning the advantages
of the dry–sump lubrication system?

Back 8

No external oil cooler is
required

Front 9

What is the capacity of the dry–sump
oil tank?

Back 9

3.25 gallons

Front 10

Oil tank flapper valves are most
likely to be closed under which of
the following flight conditions?

Back 10

When decreasing aircraft speed

Front 11

Which of the following statements is
correct concerning components used
for handling foaming oil?

Back 11

All oil tanks provide an
expansion space for foaming

Front 12

Scavenge elements of all types of
oil pumps used in the system have
greater pumping capacity than the
pressure elements for what reason?

Back 12

To prevent oil from collecting
in the bearing pumps

Front 13

What are the three most common types
of oil pumps?

Back 13

Gear, gerotor, and piston

Front 14

Under which of the following
circumstances does oil flow through
the relief valve of the gear-type
oil pump?

Back 14

pressure pump output is too high

Front 15

What factor determines the output
pressure of the gerotor–type oil
pump?

Back 15

Engine rpm

Front 16

Check valves are used to prevent
hazardous accumulations of oil due
to which of the following actions?

Back 16

Gravitational force after the
engine is shut down

Front 17

The main oil filters strain the oil
at what point in the system?

Back 17

Just as it leaves the pressure
pump

Front 18

What component receives the oil
after it flows through the lastchance
filter and onto bearing
surfaces?

Back 18

Spray nozzles

Front 19

All magnetic chip detectors
illuminate a warning light in the
cockpit, indicating a possible
engine failure.

Back 19

False

Front 20

Some engines use an oil cooler made
of rectangular-sectioned aluminum
tubing spirally wound between two
flanges. This type of cooler acts
as what other component?

Back 20

Inlet air duct

Front 21

What governs the ability of an oil
cooler to cool the oil that passes
through it?

Back 21

The amount of air passing
through it

Front 22

In an engine using a fuel–oil heat
exchanger. oil temperature is
governed by a thermostatic valve
that regulates the flow of

Back 22

oil through the heat exchanger
only

Front 23

What is the best method of oil jet
delivery for the lubrication system?

Back 23

Solid oil spray

Front 24

What component is usually included
on the scavenge oil line?

Back 24

Temperature gauge

Front 25

What unit prevents pressure within
the oil tank from rising above or
falling below the outside pressure?

Back 25

The oil tank vent

Front 26

What is the purpose of the oil tank vent system pressure relief valves?

Back 26

To assure a positive flow to the
oil pump

Front 27

Which of the following are examples
of the three main types of seals
used in jet engines oil systems?

Back 27

Synthetic, carbon, and labyrinth

Front 28

Synthetic seals come in many shapes
and are reusable.

Back 28

False

Front 29

Which of the following oil seals is
usually spring–loaded?

Back 29

Carbon

Front 30

Which of the following types of oil
seals used in the jet engine bearing
support housing can be pressurized
to minimize oil leakage?

Back 30

labyrith

Front 31

In aircraft equipped with an
electrical metal chip detector, what
indication alerts the pilot to metal
contamination in the oil?

Back 31

A warning light

Front 32

Why is the immediate location of any
leak important?

Back 32

Part failure or loss of an
engine may result

Front 33

Which of the following publications
will give you additional information
about packing shelf life?

Back 33

NAVSUP Pub 4105

Front 34

It is important to keep seals and
packings in their original unopened
packages for which of the following
reasons?

1. Seals and packings deteriorate
when exposed to light and
moisture when opened
2. Flattening or creases of seals
and packings occur after opening
3. Both 1 and 2 above
4. It is important for
identification purposes only

Back 34

3. Both 1 and 2 above

Front 35

What is the greatest difficulty
encountered when a gasket, packing,
or seal is replaced?

Back 35

Installing it properly

Front 36

During which, if any, of the
following maintenance actions should
you use a direct pressure reading
gauge?

Back 36

Before and after making any oil
pressure adjustments

Front 37

Which of the following actions is
required for screens removed from a
screen and spacer type oil filter?

Back 37

3. Route old screens to AIMD for
ultrasonic cleaning

Front 38

What is the most probable cause of
high oil pressure in the internal
oil system?

Back 38

Low oil temperature

Front 39

Which of the following corrective
actions is required for a turboprop
engine reduction gearbox with a
fixed orifice oil system and with
high oil pressure?

Back 39

Replace engine

Front 40

Metal particles found in mag plugs
are always cause for engine removal.

Back 40

False

Front 41

A silver particle dropped in nitric
acid produces what reaction?

Back 41

A whitish fog

Front 42

Which of the following acids is used
to detect if chromium is present in
particles found in engine oil
strainers?

Back 42

Hydrochloric acid

Front 43

Which of the following items is used
to determine if aluminum is present
in particles found in oil strainers?

Back 43

Hydrochloric acid

Front 44

What two methods are used for early
detection of oil contamination?

Back 44

Magnetic chip detector and the
Navy Oil Analysis Program

Front 45

What activity provides information
concerning sampling points,
techniques, and intervals for the
NOAP program?

Back 45

CFA

Front 46

During which, if any, of the
following maintenance actions should
you use a direct pressure reading
gauge?

Back 46

m

Front 47

Wear metals are generated by the
relative motion between metallic
parts in moving contact in an
unlubricated mechanical system.

Back 47

False

Front 48

For normally operating equipment,
wear is produced at what rate?

Back 48

Constant rate

Front 49

During initial break–in, new or
newly overhauled engine assemblies
tend to produce which of the
following concentrations of wear
metals?

Back 49

High

Front 50

What is the total number of methods
of spectrometric oil analysis?

Back 50

Two

Front 51

When using the atomic emission
method of spectrometric analysis,
which of the following heat sources
is used to energize the atomic
structure of metal elements
suspended in oil?

Back 51

High–voltage spark

Front 52

When using the atomic emission
method of spectrometric analysis,
which of the following heat sources
is used to energize the atomic
structure of metal elements
suspended in oil?

Back 52

high voltage spark

Front 53

When using the atomic absorption
method of spectrometric analysis to
determine the concentration of wear
metals in lubricating fluid, which
of the following items is absorbed
by the vaporized elements?

Back 53

light ebergy

Front 54

Spectrometric fluid analysis is
effective only for those failures
that are characterized by a normal
increase in the wear metal content
of the lubricating fluid.

Back 54

true

Front 55

A sudden increase of wear metals in
one component and a decrease in
another component should be
considered a problem related to

Back 55

improper sampling of both
components

Front 56

Oil sampling intervals should NOT
vary from that specified for a given
type/model/series of equipment by
more than what prescribed amount?

Back 56

±10%

Front 57

Which of the following is NOT
considered a routine sample under
the oil analysis program?

1. Samples requested by the CFA
2. Samples taken following an
accident
3. Samples taken before and after
the replacement of a major oil
lubricating component
4. Each of the above

Back 57

Each of the above

Front 58

The two basic methods of taking a
fluid sample are the dip tube
technique and what other technique?

Back 58

drain

Front 59

Which of the following is a
necessary practice when performing
the drain method to obtain a fluid
sample?

Back 59

AllOW fluid to flow before
taking samples

Front 60

What form should you use when
requesting an oil analysis of an oil
sample at a laboratory at a deployed
site?

Back 60

DD Form 2026

Front 61

Which of the following oil samples
require(s) a logbook entry?

1. Routine oil sample
2. Samples taken after a check
flight for engine change
3. When changing monitoring
laboratories
4. All of the above

Back 61

4. All of the above

Front 62

An oil analysis request includes
which of the following information?

Back 62

4. All of the above

Front 63

Which of the following publications
contains complete information
concerning the Navy Oil Analysis
Program (NOAP)?

Back 63

NAVMATINST 4731.1