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Military

AL0993 Practice Exercise
Lesson 7: Solar T62 Auxiliary Power Unit

Instructions The following items will test your understanding of the material covered in this lesson. There is only one correct answer for each item. When you have completed the exercise, check your answers with the answer key that follows. If you answer any item incorrectly, review that part of the lesson which contains the portion involved.  
True-False
  1.   An hour meter attached to the engine records the operating time of the engine.

True
False
  2.   In the turbine assembly, the shaft is supported by a forward ball bearing and an aft roller bearing.

True
False
  3.   The OVSP light on the instrument panel goes on when the horsepower reading reaches 70 percent.

True
False
  4.   Both models of the T62 invariably burn JP-4 gasoline.

True
False
  5.   Lubrication system pressure is maintained at 15 to 25 psi by a pressure relief valve.

True
False

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

FIRST GROUP
The T62 electrical system supplies power for the ignition and engine electrical accessories. Evaluate the following statements by marking them true or false.
  6.   The spark plug used for ignition operates all the time the engine is running.

True
False
  7.   The speed switch is actually two switches in one housing.

True
False
  8.   The ignition exciter converts input current to an intermittent high-energy current.

True
False
  9.   All current in the APU is dc.

True
False
10.   A switch shuts the engine down if the exhaust is too hot.

True
False
11.   The tachometer generator and the speed switch are mounted on the accessory drive assembly.

True
False
SECOND GROUP
In a description of the T62 APU, you find the following information.
12.   The T62 APU is an item of ground support equipment.

True
False
13.   It has its own hydraulic starter motor.

True
False
14.   Each model of the T62 has different temperature limits.

True
False
15.   The T62T-2A has a higher input speed than the T62T-16A.

True
False
16.   It develops approximately 70 shaft horsepower.

True
False
17.   Its compressor and turbine rotor are mounted back-to-back on a single shaft.

True
False
THIRD GROUP
Which of the following information about the T62 fuel system is correct?
18.   The flyweight assembly in the governor housing allows a small amount of fuel to flow at all times.

True
False
19.   For combustion, atomized fuel from the start fuel nozzle is ignited by the spark plug.

True
False
20.   As compressor pressure increases, so does fuel flow to the main fuel injectors.

True
False
21.   Fuel flow to the fuel injectors is not affected by ambient air pressure.

True
False
22.   When the fuel pressure switch opens, it actuates the mechanism to start the engine.

True
False
FOURTH GROUP
About the operation of the T62, the reference text tells you that:
23.   During starting, when the hydraulic starter rotates the compressor, air is drawn into the engine inlet.

True
False
24.   The start fuel solenoid valve is opened when the speed of the APU reaches 75%.

True
False
25.   Power for the reduction drive assembly comes directly from the compressor.

True
False
26.   Fuel from the start fuel nozzle is ignited by a spark plug.

True
False
27.   Fuel goes into the combustor through six vaporizer tubes.

True
False
FIFTH GROUP
If any of the APU operating limitations are exceeded, protective devices shut the APU down.
28.   An overspeed switch is set at 110 percent.

True
False
29.   When the instrument panel "Low Oil Press" light comes on, the pilot must switch off the APU immediately.

True
False
30.   Oil pressure must be more than 6 psi.

True
False
31.   If the APU shuts off, the cockpit control switch must be moved to the STOP position before restarting the engine.

True
False
32.   The overspeed switch shuts off the engine fuel flow.

True
False
33.   The pilot shuts off the APU when the instrument panel OVSP light turns on.

True
False
Matching

Match the specifications in column I with the model to which they apply in column II by writing the proper letter by each question. Each item in column II may be used once, more than once, or not at all.
  Column I Column II
34.   Has a housing, liner, and nozzle shield.
  1. Accessory drive assembly.
  2. Reduction drive assembly.
  3. Combustor assembly.
  4. Turbine assembly.
  A. B. C. D. 
35.   Is the major difference between the two T62 models.
  A. B. C. D. 
36.   Intake air passes through its inlet assembly.
  A. B. C. D. 
37.   Six self-tapping screws center the lining in the housing.
  A. B. C. D. 
38.   Its gears drive the hydraulic starter.
  A. B. C. D. 
39.   A ring gear transmits the drive from the planetary gears to the output shaft.
  A. B. C. D.