What component on the New Generation Heater activates the HCU?
Oil pressure switch
Burner control unit
Heat control switch
The HCU on the New Generation Heater starts the main air fan for output air when
A heat setting is selected
Constant flame is established
The temperature gauge reads COOL
The inside temperature reaches 140°F
When should you use starting aids to start the New Generation Heater?
During the engine start up with the ignition switch in PREHEAT position
Never, as it will result in serious engine damage
When the temperature gauge reads COOL
When ambient temperature is below 32°F
Repair of ground heater equipment should never be attempted
Without first talking with the operator
Without first consulting your supervisor
Unless accurate technical data is available
Unless in the presence of an experienced mechanic
The amount of heat required to raise the temperature of one pound of a substance one degree Fahrenheit is known as
British thermal unit
Heat that can be felt and added or subtracted to a substance without changing its state is called
Heat added to gaseous substance is known as
The relationship between pressure and the boiling point of a liquid is seen when
Pressure increases, it raises the boiling point
Pressure increases, it lowers the boiling point
The boiling point increases, it raises the pressure
The boiling point increases, it lowers the pressure
The factors that have the greatest bearing on the temperature of a refrigerant are the boiling of a liquid and the amount of heat applied and the
Temperature of the vapor
Type of heat transfer
Moisture in the air
What component on the MA-3D air conditioner allows the operator to control the overall volume of air leaving the unit?
Blower control switch
Airflow control switch
Evaporator control switch
Temperature control switch
What type of solution is used in the MA-3D aftercooler system to carry heat away from the conditioned air stream?
Pure water solution
Ethylene glycol/water solution
Refrigerant that leaves the evaporator coil in the MA-3D air conditioner is further changed into a
Low pressure gas
High pressure gas
Low pressure liquid
High pressure liquid
After the refrigerant leaves the compressor on the MA-3D air conditioner, it passes through the oil separator and into the
Receiver inlet valve
When starting the MA-3D air conditioner, hold the safety override switch until
30 psi oil pressure is registered on the engine oil pressure gauge
You release the start switch
The engine warms up
The engine starts
What component on the MA-3D air conditioner receives input from sensors for suction pressure and leaving air temperature?
Air cooler fan
Air volume controller
Temperature control knob
What component on the MA-3D air conditioner shuts off the compressor when the suction pressure drops below 5 psi?
Low pressure cutout
High pressure cutout
What type of refrigeration system leak occurs when the pressure within the system is less than atmospheric pressure?
When performing refrigerant recovery, be sure
To use vacuum pumps
To use the HCU
The output air is between 150°F – 185°F
The refrigerant has become a low-pressure vapor for compressor use
The air cycle machine of an A/M32C–10D air conditioner consists of
An air compressor fan only
An expansion turbine only
A heat exchanger and an expansion turbine
An expansion turbine and a compressor fan
The component of a A/M32C–10D air conditioner that extracts energy from the bleed air on the air cycle machine is the
The compressor switch on the ACE 802S must be held in the HOLD position when engaging the compressor in order to
Ensure the engine is at governed speed before engaging compressor.
Allow the oil and discharge pressures to stabilize.
Defrost the evaporator.
Build-up oil pressure.
What action occurs in the evaporator of the ACE 802S air conditioner?
Condensing refrigerant absorbs heat from the air stream.
Boiling refrigerant absorbs heat from the air stream.
Condensing refrigerant loses heat to the air stream.
Boiling refrigerant loses heat to the air stream.
What system on the ACE 802S air conditioner “supercharges” the compressor?
What valve must be opened prior to starting the engine on the ACE 802S?
What must be accomplished to avoid damage prior to operating the ACE 802S air conditioner in the HEATING mode after COOLING mode operation?
Permit refrigerant pressure to equalize.
Perform maximum refrigerant pump down.
Place heating/cooling switch in HEATING position.
Place the reversing valve lever in the HEATING position.
In troubleshooting, what is the first step that must be completed when a unit comes in with a write-up in the forms?
Isolate the problem.
Perform a service inspection.
Perform an operational check.
Recognize the write-up as a malfunction.
How can a restriction in a refrigerant system be identified?
Frosting at the outlet
Sweating of the outlet
Increased suction pressure
Loosen fittings to check flow
Oil in the rotary vane compressor
Lubricates the connecting rods
Has high viscosity and is very inflammable
Forms a seal between the vanes and the stator
Permits it to be typed as a high pressure unit
What provides pressurized oil to the rotor blades of the MC-2A rotary sliding vane compressor?
On the MC-2A rotary sliding vane compressor, the minimum pressure valve does all of the following except
Ensure minimum pressure within the oil chamber.
Ensure minimum pressure to the condensate drain.
Prevent receiver air from flowing back to the compressor by working as a check valve.
Increase the efficiency of the felt pads by ensuring they receive a constant minimum air pressure.
What medium is used to cool the MC-2A rotary vane compressor?
What is the air output of the MC-2A rotary sliding vane compressor?
High volume, high pressure
High volume, low pressure
Low volume, high pressure
Low volume, low pressure
The valves on a reciprocating compressor are operated by
Oil-moisture traps are required on a multi-stage reciprocating compressor to
Cool the compressed air
Ensure even compression of the air
Introduce moisture to the compressed air
Remove moisture from the compressed air
During an inspection on an LN2 cart, you should look at all of the following except the
Engine oil level
Unit for cleanliness
Front end alignment
When LOX carts are being transported, what position should the vent valve be in?
How is the air compressor in the SGNSC categorized?
What component on the SGNSC removes nitrogen from the ambient air?
To start the SGNSC, the operator must place the ignition switch in the start position for no more than
At what storage cylinder pressure, in psig, should the SGNSC nitrogen booster compressor stop?
The proper level of the gauge of the hydraulic reservoir should be
2/3 to 3/4 inch from the bottom of the glass
2/3 to 3/4 inch from the top of the glass
1/2 inch from the bottom of the glass
1/2 inch from the top of the glass
During an operational check of an SGNSC you find that the engine starts, is running at 3,000 rpm, but the nitrogen purity does not reach 95.5% within 30 minutes. What is a probable cause of this malfunction?
Warming door is not lowered for cold weather operating conditions
Low oil level in the feed air compressor lubricant separator tank
Booster compressor defective
Poor air ventilation
What is important to keep in mind when performing maintenance on the SGNSC?
When filling and bleeding the hydraulic system of the MJ-2A-1 hydraulic test stand, the reservoir selector valve must be in the
The purpose of the low pressure pump on the MJ-2A-1 is to ensure a constant flow of fluid to the
Low pressure filters
High pressure pump
In the MJ-2A-1 hydraulic test stand, the output volume of the high pressure pump is controlled by the
Flow control valve
If the position of the reservoir selector valve is changed in the hydraulic test stand during operation, the operator may cause the
Flowmeter to be damaged
Aircraft reservoir to overfill
Flow control valve seals to rupture
Return system pressure to decrease
What engine system safety device on the MJ-2A-1 hydraulic test stand sounds the warning horn in the event of an engine system malfunction?
Water level switch
Fuel level indicator
Fuel pressure switch
When setting the controls for operation of the MJ-2A-1 hydraulic test stand, what control must you set in the OPEN position?
Compensator control valve
Return system bypass valve
Supply shut-off valve
System selector valve
When filling and bleeding the MJ-2A-1 hydraulic test stand, the system should be pressurized and bled until
A solid line of fluid can be seen in the sight tube.
The sight tube is filled with bubbles.
Sight tube fluid turns a milky color.
Sight tube fluid is blue in color.
What is the most important logical step in troubleshooting a malfunction?
When a line is to be disconnected you
Ensure there is no pressure in the system.
Replace it with the same type of line.
Mark the location of the line.
Seal all openings.
The volume of oil delivered from the variable displacement hydraulic pump to the fixed displacement hydrostatic motor of the MJ-1B bomblift determines the
Direction of movement of the lift arms
Speed of movement of the lift arms
Direction of movement of the truck
Speed of movement of the truck
What prevents over pressurization of the steering system of the MJ-1B bomblift?
What valve on the MJ-1B bomblift prevents collapsing of the cantilever lifting arms in the event of hydraulic pressure failure?
As soon as the engine of the MJ-1B starts, you should check for sufficient
During an operational check of the MJ-1B bomblift, all hydraulic components should exhibit
A smooth movement with no binding or no jumping
Fast steady movements with minimal jumping
Some settling once the actuator is released
Small amounts of residue
What is the purpose of the rear control shutoff valve on the MHU-83C/E bomblift?
Isolates the brake valve
Isolates the counterbalance valve
Cuts off fluid through the hydrostatic drive
Cuts off fluid through the rear control valves
What component on the MHU-83C/E bomblift supplies the brake valve and calipers with fluid?
Hydraulic system control valve
When verifying the proper operation of the centering mechanism on the MHU-83C/E bomblift, the unit should
Start in reverse
Move in neutral
Not start in reverse
Not move in neutral
You check the backup hydraulic system on the MHU-83C/E bomblift by
Closing the shutoff valve
Operating the hand pump
Closing the air bleed valve
Operating the system pump
If there is a discrepancy between the workcards and TO, you should refer to
Both the TO and workcards
How do you check the shift lock lever for proper operation?
An audible click will be heard and the locking lever will move downward.
The unit will not move in reverse and an audible click will be heard.
Locking lever will move upward and an audible click will be heard.
The unit starts and moves in both directions.
When troubleshooting the electrical system on the MJ-1B bomblift, what component will give you a visual indication that the alternator is charging?
Control panel light
The engine safety circuits on the FL-1D shutdown the engine by
Opening the fuel solenoid
Closing the engine intake air
Shutting off fuel to the engine
Tripping the protective circuit breaker
What is used to raise the mast on the FL-1D?
What must you do prior to raising or lowering the mast from the vertical or horizontal position on the FL-1D?
Secure all doors
Warm-up the engine
Set the master control switch to ON
Position the towbar to the left or right
When a unit comes in with a write-up, how do you verify a malfunction exists?
Operate the unit
Analyze the problem
Perform a service inspection
Give several probable causes
Where can you find test procedures for a particular component?
Unit manufacturer’s TO
Periodic inspection workcards
Service inspection workcards
Illustrated parts breakdown
On the outriggers of the split deck maintenance platform, what prevents accidental loss of cylinder extension?
Pilot check valve
What are the two lifting capacities of the davit (lift pulley) on the maintenance platform?
150 lbs. or 550 lbs
250 lbs. or 500 lbs
550 lbs. or 2000 lbs
1000 lbs. or 2000 lbs
What switch, when turned to the OFF position will prevent all control console functions
except platform lowering and engine operation?
Mode selection switch
When troubleshooting the split deck maintenance platform, how do you bypass the long scissors control cable and operate the control console while observing the test meter?
Plug the control console directly into the hydraulic control module.
Disconnect the control console from the hydraulic control module.
Energize the malfunctioning system.
Cut the scissors control cable.
While operating the split deck maintenance platform you realize the platform will not lower, the probable cause could be
Corroded battery cables
A defective control cable
The main disconnect switch is ON
The engine switch is in RUN position
What component provides manual speed adjustment on the AF/M32T-1 cabin leakage tester?
Fuel system relief valve
If the air intake of the AF/M32T-1 cabin leakage tester was restricted, what effect would it have on operation?
High blower output
Low blower output
High cabin pressure
Correct cabin pressure
What is the reservoir fluid capacity and system pressure of the hydraulic pump on the B-6, 10-ton hydraulic tripod jack?
2.1 gallons at 2250 psi
1.5 gallons at 2200 psi
1.1 gallons at 2235 psi
1.0 gallons at 1135 psi
What component on the B-1 adjustable aircraft maintenance platform allows the work platform and steps to remain parallel to the base at any desired platform height?
Stair support linkage
Hydraulic cylinder assembly
What controls the speed of retraction of the hydraulic cylinder assembly on the B-1 adjustable aircraft maintenance platform?
Handle on the bypass valve
Upper structure assembly
What type of mechanism does the B-4 adjustable aircraft maintenance platform utilize to raise and lower the platform?
What section of the towbar has a screw actuated fork assembly that is used to engage or disengage the aircraft nose gear?
Head adapter assembly
Main tube assembly
The purpose of the lift mechanism on the towbar is to
Adjust the forks
Stabilize the main tube assembly
Raise and lower the wheel assemblies
Engage or disengage the aircraft nose gear
What position would you put the valve handle in to precharge the supply tank of the PMU- 29/E oil cart?
When servicing the hydraulic cart, what prevents large particles in the fluid from entering the reservoir?
Within the universal jack tester control box, what is used to increase the strength of the signals to keep background noise to a minimum?
Analog digital converter