| True-False
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| 1. |
To find out what kind of metal is in used oil, the wave length of the light from burning it is measured.
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| 2. |
Troubleshooting charts to analyze, isolate, and correct engine malfunctions are found in the engine TM.
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| 3. |
In selecting a method for cleaning an engine, make sure that anodizing or dichromating is not removed from the surface.
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| 4. |
If an exhaust gas temperature system needs troubleshooting, a jetcal analyzer is used.
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| 5. |
The symbol "D" on a maintenance allocation chart means direct support maintenance.
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| 6. |
Special instructions are required at specific intervals between scheduled inspections.
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| 7. |
Maintenance and inspection of gas turbine engines are appreciably more difficult than those of reciprocating engines.
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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?
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| 8. |
These precautions are listed in the technical manual for the engine you are working on.
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| 9. |
Turbine exhaust gases are low enough in temperature and velocity that exhaust areas are not hazardous.
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| 10. |
Cadmium plated tools are permissible for use on gas turbine engines.
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| 11. |
Metals subject to high temperatures must not be marked with a lead pencil.
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| 12. |
If combustion chamber parts have been exposed to fuels containing tetraethyl lead, anyone handling them should wear gloves and a face mask.
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| 13. |
Lubricating oil requires no special precautions.
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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.
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| 14. |
The engine manufacturer runs the engine in a test cell before it is shipped to the user.
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| 15. |
When an engine is run in a test cell, different demands are placed on it than when it is installed on an aircraft.
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| 16. |
Ambient temperature and pressure affect the weight of the air entering the engine.
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| 17. |
No corrections of engine problems are made during testing.
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| 18. |
An engine may also be tested by a mobile engine test unit.
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| 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.
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| 20. |
Engine information obtained during testing does not become a part of the engine record.
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THIRD GROUP
About cleaning compressor rotor blades, the reference text tells you that:
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| 21. |
The temperature-sensing element on the T53 engine is cleaned with a spray of clean, fresh water.
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| 22. |
A steady increase in EGT during normal operation is one indication that the compressor rotor blades may need cleaning.
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| 23. |
If the engine has been operating in salt-air areas, spraying it with fresh water is all the cleaning necessary.
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| 24. |
Always refer to the TM for the specific engine to find the exact procedure for cleaning it.
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| 25. |
The T53 engine does not have to be run after it is cleaned.
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| 26. |
The engine TM specifies a definite performance point at or below which the compressor blades must be cleaned.
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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.
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| 28. |
After the TBO for an engine is established, it is not changed.
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| 29. |
No special tools are needed to disassemble an engine.
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| 30. |
Permanent storage is a depot-level function.
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| 31. |
When disassembling or assembling an engine, instructions in the TM must be followed precisely.
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| 32. |
The degree of preservation of an engine is governed by the length of time it is expected to be in storage.
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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.
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| 34. |
In a gas turbine engine, imbalance of rotating parts is the main cause of vibrations.
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| 35. |
A vibration transducer is used to analyze the force generated by the amount of imbalance and the rotating speed.
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| 36. |
Imbalance is measured in mils.
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| 37. |
The Engine Vibration Test Data Sheet gives the figures for maximum permissible engine vibration.
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| 38. |
Externally excited vibrations may also be caused by imbalance of rotating engine components.
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