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Military

AL0993 Practice Exercise Answer Key & Review
Lesson 4: Testing, Inspection, Maintenance, and Storage Procedures


True - False
  1.   To find out what kind of metal is in used oil, the wave length of the light from burning it is measured.

  True
  2.   Troubleshooting charts to analyze, isolate, and correct engine malfunctions are found in the engine TM.

  True
  3.   In selecting a method for cleaning an engine, make sure that anodizing or dichromating is not removed from the surface.

  True
  4.   If an exhaust gas temperature system needs troubleshooting, a jetcal analyzer is used.

  True
  5.   The symbol "D" on a maintenance allocation chart means direct support maintenance.

  False
  6.   Special instructions are required at specific intervals between scheduled inspections.

  False
  7.   Maintenance and inspection of gas turbine engines are appreciably more difficult than those of reciprocating engines.

  False

Cluster True - False
Each of the following groups of questions is related to the statement that precedes them.

FIRST GROUP
Various safety precautions must be taken during engine maintenance to prevent serious injury, illness, or death. Which of the following are among them?

  8.   These precautions are listed in the technical manual for the engine you are working on.

  True
  9.   Turbine exhaust gases are low enough in temperature and velocity that exhaust areas are not hazardous.

  False
10.   Cadmium plated tools are permissible for use on gas turbine engines.

  False
11.   Metals subject to high temperatures must not be marked with a lead pencil.

  True
12.   If combustion chamber parts have been exposed to fuels containing tetraethyl lead, anyone handling them should wear gloves and a face mask.

  True
13.   Lubricating oil requires no special precautions.

  False
SECOND GROUP
Testing an engine is a necessity, both before it is sent to the user and after it is in use. Evaluate the following statements by marking them True or False.
14.   The engine manufacturer runs the engine in a test cell before it is shipped to the user.

  True
15.   When an engine is run in a test cell, different demands are placed on it than when it is installed on an aircraft.

  False
16.   Ambient temperature and pressure affect the weight of the air entering the engine.

  True
17.   No corrections of engine problems are made during testing.

  False
18.   An engine may also be tested by a mobile engine test unit.

  True
19.   If an engine fails a test run in a test cell, not only is it disassembled and checked for faults, but many previous engines are also.

  True
20.   Engine information obtained during testing does not become a part of the engine record.

  False
THIRD GROUP
About cleaning compressor rotor blades, the reference text tells you that:
21.   The temperature-sensing element on the T53 engine is cleaned with a spray of clean, fresh water.

  False
22.   A steady increase in EGT during normal operation is one indication that the compressor rotor blades may need cleaning.

  True
23.   If the engine has been operating in salt-air areas, spraying it with fresh water is all the cleaning necessary.

  False
24.   Always refer to the TM for the specific engine to find the exact procedure for cleaning it.

  True
25.   The T53 engine does not have to be run after it is cleaned.

  False
26.   The engine TM specifies a definite performance point at or below which the compressor blades must be cleaned.

  True
FOURTH GROUP
These statements are on gas turbine engine overhaul and repair, storage, and preservation. Evaluate them by marking them True or False.
27.   An engine does not go into the flyable storage category until it has not been operated for six days.

  False
28.   After the TBO for an engine is established, it is not changed.

  False
29.   No special tools are needed to disassemble an engine.

  False
30.   Permanent storage is a depot-level function.

  True
31.   When disassembling or assembling an engine, instructions in the TM must be followed precisely.

  True
32.   The degree of preservation of an engine is governed by the length of time it is expected to be in storage.

  True
FIFTH GROUP
Which of the following statements agree with the information on engine vibrations given in your text?
33.   Forced vibrations are invariably caused by improper assembly of the components.

  False
34.   In a gas turbine engine, imbalance of rotating parts is the main cause of vibrations.

  True
35.   A vibration transducer is used to analyze the force generated by the amount of imbalance and the rotating speed.

  True
36.   Imbalance is measured in mils.

  False
37.   The Engine Vibration Test Data Sheet gives the figures for maximum permissible engine vibration.

  True
38.   Externally excited vibrations may also be caused by imbalance of rotating engine components.

  False
Matching

In questions 39 through 44, match the statements in column I with the laws or principles of physics in column II by selecting the proper letter under each question. Each item in column II may be used once, more than once, or not at all.

39.   Uses P-D-680 Type 1.
  D.  Dry-cleaning solvent.
40.   Used on steel and stainless steel.
  B.  Solvent immersion.
41.   Uses heated trichloroethylene.
  A.  Vapor degreasing.
42.   Removes heavy greases from aflexible hose.
  D.  Dry-cleaning solvent.
43.   Condenses on metal surfaces.
  A.  Vapor degreasing.
44.   Uses MIL-C-19853.
  B.  Solvent immersion.

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