Oil itself is the source of which of the following types of contamination?
carbon
Which of the following conditions causes fuel to flow into an oil system?
a ruptured fuel-oil cooler
Synthetic oils have a shelf life for which of the following reasons?
Old oil will cloud or form contaminants
What is the NATO number for the primary oil used in jet engines?
0-156
In the wet-sump lubrication system, oil is stored in an oil tank BEFORE being cooled.
false
Which of the following lubrication systems are you most likely to encounter in the fleet?
dry-sump
Which of the following components is found on dry-sump lubricatioin systems but usually not on wet-sump systems?
oil cooler
Which of the following statements is NOT true concerning the advantages of the dry-sump lubrication system?
No external oil cooler is required
What is the capacity of the dry-sump oil tank?
3.25 gallons
Oil tank flapper valves are most likely to be closed under which of the following flight conditions?
when decreasing aircraft speed
Which of the following statements is correct concerning components used for handling foaming oil?
all oil tanks provide an expansion space for foaming
Scavenge elements of all types of oil pumps used in the system have greater pumping capacity than the pressure elements for what reason?
to prevent oil from collecting in the bearing pumps
What are the three most common types of oil pumps?
gear, gerotor, and piston
Under which of the following circumstances does oil flow through the relief valve of the gear-type oil pump?
pressure pump output is too high
What factor determines the output pressure of the gerotor-type oil pump?
engine rpm
Check valves are used to prevent hazardous accumulations of oil due to which of the following actions?
gravitational force after the engine is shut down
The main oil filters strain the oil at what point in the system?
just as it leaves the pressure pump
What component receives the oil after it flows through the last-chance filter and onto bearing surfaces?
spray nozzles
All magnetic chip detectors illuminate a warning light in the cockpit, indicating a possible engine failure.
false
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?
inlet air duct
What governs the ability of an oil cooler to cool the oil that passes through it?
the amount of air passing through it
In an engine using a fuel-oil heat exchanger, oil temperature is governed by a thermostatic valve that regulates the flow of...
oil through the heat exchanger only
What is the best method of oil jet delivery for the lubrication system?
solid oil spray
What component is usually included on the scavenge oil line?
pressure gauge
What unit prevents pressure within the oil tank from rising above or falling below the outside pressure?
The oil tank vent
What is the purpose of the oil tank vent system pressure relief valves?
to assure a positive flow to the oil pump
Which of the following are examples of the three main types of seals used in jet engines oil systems?
synthetic, carbon, and labyrinth
Synthetic seals come in many shapes and are reusable.
false
Which of the following oil seals is usually spring-loaded?
carbon
Which of the following types of oil seals used in the jet engine bearing support housing can be pressurized to minimize oil leakage?
carbon and labyrinth
In aircraft equipped with an electrical metal chip detector, what indication alerts the pilot to metal contamination in the oil?
a warning light
Why is the immediate location of any leak important?
part failure or loss of an engine may result
Which of the following publications will give you additional information about packing shelf life?
NAVSUP Pub 4105
It is important to keep seals and packings in their original unopened packages for which of the following reasons?
Seals and packings deteriorate when exposed to light and moisture when opened?
Flattening or creases of seals and packings occur after opening?
It is important for identification purposes only?
Both 1 and 2 above
What is the greatest difficulty encountered when a gasket, packing or seal is replaced?
installing it properly
During which, if any, of the following maintenance actions should you use a direct pressure reading gauge?
before and after making any oil pressure adjustments
Which of the following actions is required for screens removed from a screen and spacer type oil filter?
Route old screens to AIMD for ultrasonic cleaning
What is the most probable cause of high oil pressure in the internal oil system?
low oil temperature
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?
replace engine
Metal particles found in mag plugs are always cause for engine removal...
false
An engine may be retained in service after metal particles are found in the oil filter based on which of the following considerations?
Kind of metal?
Quantity of metal?
Shape of metal?
All of the above
To identify copper in engine systems use...
Nitric acid
To identify steel in engine systems use...
Permanent magnet
To identify tin in engine systems use...
soldering iron
A silver particle dropped in nitric acid produces what reaction?
a whitish fog
Which of the following acids is used to detect if chromium is present in particles found in engine oil strainers?
hydrochloric acid
Which of the following items is used to determine if aluminum is present in particlels found in oil strainers?
hydrochloric acid
What two methods are used for early detection of oil contamination?
magnetic chip detector and the Navy Oil Analysis Program
What activity provides information concerning sampling points, techniques, and intervals for the NOAP program?
CFA
All activities operating aeronautical equipment are required to participate in the Navy Oil Analysis Program. Which of the following people/activities have the authority to relieve them from the requirement?
cognizant field activity (CFA)
Wear metals are generated by the relative motion between metallic parts in moving contact in an unlubricated mechanical system.
false
For normally operating equipment, wear is produced at what rate?
constant rate
During initial break-in, new or newly overhauled engine assemblies tend to produce which of the following concentrations of wear metals?
high
What is the total number of methods of spectrometric oil analysis?
two
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?
high-voltage spark
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?
light energy
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.
false
A sudden increase of wearr metals in one component and a decrease in another component should be considered a problem related to...
improper sampling of both components
Oil sampling intervals shoudl NOT vary from that specified for a given type/model/series of equipment by more than what prescribed amount?
+/- 10%
Which of the following is NOT considered a routine sample under the oil analysis program?
Samples requested by the CFA?
Samples taken followiing an accident?
Samples taken before and after the replacement of a major oil lubricating component?
each of the above
The two basic methods of taking fluid sample are the dip tube technique and what other technique?
drain
Which of the following is a necessary practice when performing the drain method to obtain a fluid sample?
Allow fluid to flow before taking samples
What form should you use when requesting an oil analysis of an oil sample at a labratory at a deployed site?
DD form 2026
Which of the following oil samples require(s) a logbook entry?
when changing monitoring laboratories
An oil analysis request includes which of the following information?
How sample was taken?
Reason for sample?
Oil added since last oil analysis?
All of the above
Which of the following publications contains complete information concerning the Navy Oil Analysis Program (NOAP)?
