When ordering a part, first step to accomplish to locate an item if youdo not know the part number when using TO 4-2

Reference chapter 2, Maintenance Parts List.

(802) What is one purpose of the environmental control unit (ECU) on the periodic maintenance semitrailer?

Prevent liquids from freezing and sensitive equipment from temperatures.

(801) What is the purpose of the periodic maintenance semitrailer auxiliary power unit (APU)?

Provide a secondary means of supplying power to the semitrailer

What action(s) occur(s) when the STOP button is pressed in on the payload transporter (PT) hoist control pendant?

Two brakes actuate to halt the movement of the hoist

Where would you locate the manufacturer’s code and part number information when completing block 1 of the Form 1348–6

In the manufacturer’s catalog or on their website

What will occur if auxiliary power switch S–15 is closed on the portable air conditioner (PAC)?

The missile trailer will operate using the power source selected by the PAC

(805) What is the purpose of the payload transporter (PT) auxiliary power unit (APU)?

Provide power for the PT ECU and hoist when no site power isavailable

(809) What is the overarching objective of reconditioning emergency storage batteries?

Improving cell voltage characteristics and ensuring proper battery capacity

(808) What conversion occurs when a battery is charged?

Electrical energy into chemical energy

How is the priority of receiving an item through the supply system determined if the item is already located on base?

Determine the priority based on how soon the item is needed

What functionality does the launch tube’s C-rail provide when operating the guided missile maintenance platform (GMMP)?

Allows support structure move left and right inside the launch tube.

How does the electronic control amplifier in the guidance section liquid cooler at the launch facility (LF) operate?

sends electronic pulses to control valve to increase/decrease coolant flow

What is the purpose of the six electrical heater elements in the transporter-erector ECU?

Maintain the temperature of the missile downstage above 68 degrees .

(806) What is the purpose of the third stage of the payload transporter (PT) ECS 3-stage heating unit?

To maintain the temperature of the PT semitrailer above 65.5 degrees

(803) What is the purpose of the limit switch on the hoist of the mechanical maintenance truck?

To stop the hoist automatically once the hook is fully retracted.

(808) What causes a flooded lead-acid battery to gas?

Electrical current causes water molecules to separate into H and O

How does the rust inhibitor test kit function when testing the rust inhibitor concentration of brine solution?

Additional rust inhibitor added if color is too light

The purpose of running the PT APU under aload for 30 minutes during periodic inspection is to ensure the

APU is capable of supporting the electrical load of the PT trailer.

purpose of verifying that + voltage test point is in the spade shapeof each cell of an e-storage battery is to ensure

the polarity of each cell is correct.

What is the purpose of the (DC) alternator on the periodic maintenance semitrailer auxiliary power unit (APU)?

Charge the APU starting battery.

Why is it important to ensure that (DIFM) items are returned to the supply point in a timely manner?

DIFM are limited in quantity, could cause a shortage in the supply system

Which step is required for correcting a problem with a standard reporting designator (SRD)?

Contact the database administrator for the (IS) that your unit uses

Why will the RC of PT ACU fail to operate if the temp outside PT trailer is >43.5 degrees MANUAL COOL is selected?

Outside temp sensor S–16 open no need to run compressor if temp this low

purpose of checking electrolyte level of e-battery on anequalization charge after 15 mins and every 15 mins of 1st hour

Prevent possible electrolyte overflow

The purpose of temperature sensor S–13 in the (PT) environmental control system (ECS) is to illuminate the

red light on panel if the temp of the PT trailer not between 50-80 degrees

How does the guidance section liquid cooler at the launch facility (LF) remove heat from the missile guidance set (MGS)?

coolant chiller unit circulates cool liquid that removes heat from the MGS

(807) What is the purpose of the INCH function of the payload transporter (PT) hoist?

Precision 0.030 inches movements of the hoist can be made.

At what point during an equalization charge, can the emergency storage batteries be left unattended?

2 consecutive temp readings of cell #3 of batteries within 100of each other

In regard to the Air Force supply system, what is the purpose of a national stock number (NSN)

To identify an item as a standardized materiel item of supply

What is the purpose of the 208(VAC) 3-phase power supplied to the hydraulic pusher unit by the site power cable?

Operation of the hydraulic pump motor.

What action must be taken prior to attempting to start the (TE) auxiliary power unit (APU) in cold weather?

The preheaters must be energized for a minimum of 30 seconds

(802) Why does the periodic maintenance trailer rear heating system require two phases of power?

Both phases meet at a common resistive element to produce heat.

How does pressure indicator light DS–1 on the pumping unit of the hydraulic pusher set (HPS) operate?

Off when the hydraulic fluid filter is clogged.

What component of the periodic maintenance semitrailer requires 120/208 volts alternating current (VAC), 3-phase power?

The environmental control unit (ECU).

How is the sodium chromate solution composition checkout accomplished?

The color of solution matched against the colors on a chromate comparator

The purpose of performing capacity calc on e-batteries that have just completed a discharge cycle is to

batteries rejected, discharged a second time, or returned to service

What is the objective of resource stewardship?

Responsibly managing resources under your control

(808) What occurs during the float charge of an emergency storage battery?

Charger provides enough energy to overcome internal losses of the battery

What purpose does the guided missile maintenance platform (GMMP) serve?

Allows technicians to perform mxs from nearly anywhere in the launch tube.

How does the portable air conditioner (PAC) provide environmental control?

Air heated by electric heaters or cooled by PAC then sent through a duct

What is the purpose of the VENT function of the periodic maintenance semitrailer environmental control unit (ECU)?

Disable both heating and cooling functions and circulate ambient air

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Questions 64

Answers

1
When ordering a part, first step to accomplish to locate an item if youdo not know the part number when using TO 4-2
Reference chapter 2, Maintenance Parts List.
Locate index number that points to the visual representation of the item.
Locate the index and sheet number in the numerical index
Reference chapter 2, Numerical Index.
2
(802) What is one purpose of the environmental control unit (ECU) on the periodic maintenance semitrailer?
Prevent liquids from freezing and sensitive equipment from temperatures.
Prevent damage to the crankcase heater and blower motor in the unit
Maintain aerospace vehicle equipment (AVE) at a specified temperature
Maintain missile downstages at a specified temperature
3
(801) What is the purpose of the periodic maintenance semitrailer auxiliary power unit (APU)?
Charge the starting batteries of the tractor.
Provide a secondary means of supplying power to the semitrailer
Provide power to the tractor engine immersion heater
Charge the APU starting batteries.
4
What action(s) occur(s) when the STOP button is pressed in on the payload transporter (PT) hoist control pendant?
Control of hoist is automatically transferred to the launch tube pendant
Hoist speed will automatically default to INCH
Two brakes actuate to halt the movement of the hoist
Control of the hoist is transferred to the opposite pendant
5
Where would you locate the manufacturer’s code and part number information when completing block 1 of the Form 1348–6
In the applicable technical order
In the applicable civil engineering manual.
In the manufacturer’s catalog or on their website
In Air Force Handbook (AFH) 23–123
6
(808) What is the discharge rate in ampere-hours (Ah) of a launch facility (LF) emergency storage battery?
18 Ah.
600 Ah.
1,450 Ah
27.5 Ah
7
(803) The purpose of the site power cable located on the mechanical maintenance truck is to provide
power to under-hood components and the passenger compartment
power to the truck’s hoist.
power to the direct current (DC) lights in rear cargo compartment.
starting power for the truck’s engine
8
What will occur if auxiliary power switch S–15 is closed on the portable air conditioner (PAC)?
The PAC will operate on auxiliary power provided by the site power cable
The PAC will only respond to commands provided by the remote-control unit.
The missile trailer will operate using the power source selected by the PAC
The PAC will operate on power provided by the auxiliary power unit (APU).
9
(805) What is the purpose of the payload transporter (PT) auxiliary power unit (APU)?
Charge the starting batteries of the PT tractor.
Provide power for the PT ECU and hoist when no site power isavailable
Operate the main hydraulic pump
Extend the environmental flaps over the open launch tube.
10
(809) What is the overarching objective of reconditioning emergency storage batteries?
Decreasing battery discharge and recharge times.
cradle-to-grave data is collected on every battery utilized on a site
Collecting useful data on overall capacity of all batteries in the fleet
Improving cell voltage characteristics and ensuring proper battery capacity
11
(808) What conversion occurs when a battery is charged?
Reciprocating motion into chemical energy
Electrical energy into chemical energy
Linear energy into rotational energy
Chemical energy into electrical energy.
12
How is the priority of receiving an item through the supply system determined if the item is already located on base?
Cross-reference the UND with how soon the item is needed
Cross-reference the (UND) with the force activity designator (FAD)
Cross-reference the priority code with the (UMMIPS) designator.
Determine the priority based on how soon the item is needed
13
What functionality does the launch tube’s C-rail provide when operating the guided missile maintenance platform (GMMP)?
Allows electrical signals move threw the support structure/bucket assembly
Raises and lowers the bucket assembly.
Allows support structure move left and right inside the launch tube.
Provides connection between the bucket assembly and the support structure.
14
How does the electronic control amplifier in the guidance section liquid cooler at the launch facility (LF) operate?
sends differing voltages to coolant pump to control rate of coolant flow
controls flow of coolant through the system based on pulses from d-box
sends electronic pulses to control valve to increase/decrease coolant flow
amplifies signals from the control valve to control rate of coolant flow
15
Which copy of the Department of Defense (DD) Form 1348–1A,kept by the receiving organization for their records
1
4
2
3
16
What is the purpose of the six electrical heater elements in the transporter-erector ECU?
Maintain the temperature of the missile downstage above 72 degrees
Ensure the ECU does not freeze up during the winter months.
Maintain the temperature of the missile downstage above 68 degrees .
Ensure the crankcase of the refrigerant compressor remains warm.
17
(806) What is the purpose of the third stage of the payload transporter (PT) ECS 3-stage heating unit?
To maintain the temperature of the PT semitrailer between 60 and 100degrees
To maintain the temperature of the PT semitrailer above 65.5 degrees
To provide heat regardless of the temperature of the PT semitrailer.
ACU refrigerant compressor crankcase stays above 43.5 degrees
18
(803) What is the purpose of the limit switch on the hoist of the mechanical maintenance truck?
To ensure the hoist does not exceed its maximum lifting capacity.
To feed the chain back into the container as the hoist hook is retracted.
To stop the hoist automatically once the hook is fully retracted.
To ensure the hoist does not extend too far out of the rear of the truck.
19
(808) What causes a flooded lead-acid battery to gas?
Heat causes the electrolyte to boil and release steam
Air at the bottom of a battery released when placed under anload
Oxygen gas released from intense heat generated when discharged.
Electrical current causes water molecules to separate into H and O
20
How does the rust inhibitor test kit function when testing the rust inhibitor concentration of brine solution?
Additional rust inhibitor added if color is too light
Additional ethylene glycol added if number is too low
Additional rust inhibitor added number is too high
Additional ethylene glycol added if number is toohigh
21
What temperatures must a brine chiller being tested on the (BCTS) maintain under both LOW and HIGH heat loads?
31 to 39 on LOW; below 39 on HIGH
31 to 33 on HIGH; below 39 on LOW
31 to 39 on HIGH; below 39 on LOW
31 to 33 on LOW; below 39 HIGH
22
The purpose of running the PT APU under aload for 30 minutes during periodic inspection is to ensure the
APU does not consume more than 30 gallons of diesel fuel per hour
APU is capable of supporting the electrical load of the PT trailer.
engine oil is at temp and has been circulated prior to draining it.
heater of the PT environmental control system will provide adequate heat.
23
purpose of verifying that + voltage test point is in the spade shapeof each cell of an e-storage battery is to ensure
each cell is installed into the steel tray of the battery correctly
the polarity of each cell is correct.
the battery possesses the proper negative-to-positive polarity.
each cell possesses the proper voltage.
24
What is the purpose of the (DC) alternator on the periodic maintenance semitrailer auxiliary power unit (APU)?
Charge the APU starting battery.
Provide power to the tractor engine immersion heater
Provide a secondary means of supplying power to the semitrailer
Charge the starting batteries of the tractor.
25
Why is it important to ensure that (DIFM) items are returned to the supply point in a timely manner?
DIFM are limited in quantity, could cause a shortage in the supply system
So that the item can be shipped out for depot-level repairs
Only 10 DIFM items exist throughout the entire missile field
So that the item can be shipped out for base-level repairs
26
How does the ventilation subsystem of the (BCTS) provide different rates of airflow to a unit being tested?
One two-speed fan
One variable speed 9,000 CFM fan
One 3,000 cubic foot per minute (CFM) fan and one 6,000 CFM fan
One variable speed 3,000 CFM fan.
27
Which step is required for correcting a problem with a standard reporting designator (SRD)?
Submit an Air Force Form 1230, (SRD) Candidate Informationto SRD manager
Cross-reference the (UND) with how soon the item is needed
Contact the database administrator for the (IS) that your unit uses
Determine the UND and force activity designator (FAD).
28
What should use for the commercial description for block 8, Description of Item Requested whenpreparing the Form 1348-6
A single leading adjective only.
A proper noun
Multiple adjectives, separated by commas.
A pronoun.
29
Why will the RC of PT ACU fail to operate if the temp outside PT trailer is >43.5 degrees MANUAL COOL is selected?
Refrigerant cool too fast at temp LPC S–3 will not close
Refrigerant in crankcase of RC is a liquid at temp compressor damage occur
Refrigerant liquefy early in the condenser coil at temp wouldbackup to RC
Outside temp sensor S–16 open no need to run compressor if temp this low
30
Besides condensing air, what does the brine chiller test stand (BCTS) provide to the brine chiller unit being tested?
Controls and refrigerant
Controls and a heat load.
Refrigerant and a heat load
Brine and refrigerant
31
purpose of checking electrolyte level of e-battery on anequalization charge after 15 mins and every 15 mins of 1st hour
Ensure that the electrolyte temperature has not exceeded 115 degrees
Prevent possible electrolyte overflow
. Ensure that the battery charger output has not exceeded 43.2 (VDC)
Prevent excessive gassing
32
(803) What control buttons are on the hoist control pendant of the mechanical maintenance truck?
UP, DOWN, and STOP only
UP, DOWN, LEFT, and RIGHT only
UP and DOWN only
UP, DOWN, SLOW, FAST, and STOP only
33
The purpose of temperature sensor S–13 in the (PT) environmental control system (ECS) is to illuminate the
red light on panel if the temp of the PT trailer not between 50-80 degrees
red light on the panel if the internal temp of the PT trailer >45
green light on panel if the temp of PT trailer is between 45-75 degrees
green light on panel if the temp of PT trailer exceed 70.5 degrees
34
How does the guidance section liquid cooler at the launch facility (LF) remove heat from the missile guidance set (MGS)?
coolant chiller unit removes heat from coolant returning from the MGS.
electronic control amplifier controls flow by sending >/< voltage to pump
control valve controls coolant flow based on signals receives from the MGS.
coolant chiller unit circulates cool liquid that removes heat from the MGS
35
(807) What is the purpose of the INCH function of the payload transporter (PT) hoist?
left/right or back/forward movements won't register so load won't swing
movements be made because hoist will move a maximum of 2 feet per minute
Precision 0.030 inches movements of the hoist can be made.
Causes hoist to move in any direction at a maximum of 1 inch per second.
36
At what point during an equalization charge, can the emergency storage batteries be left unattended?
After 1 hr when temp readings of cells are below 115 degrees Fahrenheit.
2 consecutive temp readings of cell #3 of batteries within 100of each other
When the charger output is between 42.2 and 43.2 volts direct current (VDC)
After 1 hr when temp readings of cells are below 95 degrees Fahrenheit.
37
In regard to the Air Force supply system, what is the purpose of a national stock number (NSN)
provide standards between common parts used in the federal supply system
To identify an item as a commonly purchased item from a local vendor
ensure different parts that serve the same purpose are coded accordingly
To identify an item as a standardized materiel item of supply
38
What is the purpose of rectifier CR–1 in the portable air conditioner (PAC) control panel?
The PAC will operate on auxiliary power provided by the site power cable.
The missile trailer will operate using the power source selected by the PAC
Converts 30 VAC into 24 VDC.
Converts 120 volts alternating current (VAC) to 30 (VDC)
39
What is the purpose of the 208(VAC) 3-phase power supplied to the hydraulic pusher unit by the site power cable?
Operation of the hydraulic pump motor.
Illumination of pressure indicator light DS–1
Function of distribution circuit breaker CB–1.
Operation of the differential pressure switch SW–1.
40
What action must be taken prior to attempting to start the (TE) auxiliary power unit (APU) in cold weather?
The immersion heater must be energized for a minimum of 30 minutes
The TE container must be in the horizontal position.
A pre-start checkout.
The preheaters must be energized for a minimum of 30 seconds
41
(802) Why does the periodic maintenance trailer rear heating system require two phases of power?
Each phase energizes an independent heating coil to provide more heat.
Because of the two stages of heating that can be selected on the thermostat
Both phases meet at a common resistive element to produce heat.
To rotate the smaller two-phase motor for the blower fan
42
Besides data collection, what does the maintenance data collection process include?
Documentation, validation, and retrieval of data.
Inventory sheets and (IMDS) work packages
Storage and retrieval of data
Retrieving, data keeping, and data analyzing
43
How does pressure indicator light DS–1 on the pumping unit of the hydraulic pusher set (HPS) operate?
Off when the hydraulic fluid filter is clogged.
Illuminates when the hydraulic fluid filter becomes too clogged
Off as long as power is applied to the HPS.
Always illuminated as long as power is applied to the HPS.
44
What component of the periodic maintenance semitrailer requires 120/208 volts alternating current (VAC), 3-phase power?
The monorail hoist
The environmental control unit (ECU).
The belly water tank heater
The rear heater uni
45
How is the sodium chromate solution composition checkout accomplished?
The color of solution matched against the colors on a chromate comparator
The test strip display certain color based on the strength of the solution
The test strip display a number that correlates to strength of the solution
The color of the solution is matched against colors on the test strip
46
The purpose of performing capacity calc on e-batteries that have just completed a discharge cycle is to
time at which battery set switched from discharge to equalization charge.
determine when set of batteries reached a discharge rate of 92 (±2) amps.
batteries rejected, discharged a second time, or returned to service
the time at which the batteries reached a terminal voltage of 28.5 (VDC)
47
What is the objective of resource stewardship?
Retaining receipts and vouchers to ensure successful audits
Ensuring operating stock is supplied with low-demand, high-cost items
Responsibly managing resources under your control
Ensuring supply point shelves are stocked with high-demand items
48
(808) What occurs during the float charge of an emergency storage battery?
battery draws high amps from charger and regains 70 percent of its charge
Charger provides enough energy to overcome internal losses of the battery
charger draws high amps battery; battery regains 30 percent of its charge
battery draws high amps from charger and regains 50 percent of its charge
49
What purpose does the guided missile maintenance platform (GMMP) serve?
Allows technicians to perform mxs from nearly anywhere in the launch tube.
Provides a support bucket for raising and lowering tools into the (LER).
Provides a surface to stand on when the launch tube liner doors are open.
Allows support structure move left/right (traverse) inside the launch tube.
50
How does the portable air conditioner (PAC) provide environmental control?
Air heated by electric heaters or cooled by PAC then sent through a duct
Air heated aux power unit or cool air drawn outside and sent threw duct
Air heated by electric heaters or cool air from outside sent through duct
Air heated by aux power unit or cooled by the PAC and sent through duct
51
What is the purpose of the VENT function of the periodic maintenance semitrailer environmental control unit (ECU)?
Cooling the semitrailer until the user-specified temperature is reached
Disable both heating and cooling functions and circulate ambient air
Heating the semitrailer until the user-specified temperature is reached
Disable heating, cooling, and air movement functions of the ECU.
52
(808) The purpose of a battery is to convert
electrical energy into chemical energy.
chemical energy into electrical energy
rotational energy into linear energy.
reciprocating motion into chemical energy
53
What functionality does the power distribution box of the guided missile maintenance platform (GMMP) provide?
Actuates the bucket assembly away from the wall of the launch tube.
Allows the support structure to move left and right inside the launch tube
Allows electrical signals move threw the support structure/bucket assembly
Protects the GMMP electrical system against excessive current draw.
54
What form is used to order parts when the national stock number is known?
DD Form 431
Department of Defense (DD) Form 1348–1A.
AF Form 1230
Air Force (AF) Form 2005
55
What is the basic purpose of a supply system?
methods, equipment, and facilities to sustain a project, process or program
facilities and programs are sustained with purchases from local vendors.
Projects and programs are sustained using only government purchase cards
Ensuring supply point shelves are stocked with high-demand items
56
(808) What effect does grid corrosion have on the internal part(s) of a lead-acid battery
. Permanent crystals form on the negative battery plate.
Rust forms on both plates until they eventually contact one another.
Sediment fills bottom of battery causes shortcircuit between the two plates
The positive plate corrodes and eventually falls apart.
57
How will the portable air conditioner (PAC) operate when it is set to run in AUTO?
The PAC will continue to provide cool air regardless of the temperature
Heating and cooling systems maintain a temperature between 60 and 800
The PAC will continue to provide hot air regardless of the temperature
Heating and cooling systems maintain a temperature between 50 and1000
58
(808) What is the purpose of performing an equalization charge of an emergency storage battery?
supply remaining 70% of charge that the topping charge did not provide.
supply remaining 30% of charge that current charge did not provide.
To correct any cell voltage imbalances among different cells in a battery.
To correct any cell voltage imbalances among different batteries
59
(801) What is the purpose of the periodic maintenance semitrailer power distribution panel?
Select the power source that will be sent to the power distribution panel.
Distribute power to the site power receptacle
Provide power to the electrical loads in the semitrailer.
Provide power to the tractor engine immersion heater.
60
Besides sodium chromate powder, what substances make up the sodium chromate solution?
Ethylene glycol, sodium-hyroxide, and distilled water.
Dimethoxane, sodium-hyroxide, and distilled water
Dimethoxane, sodium-hyroxide, and rust inhibitor.
Dimethoxane, rust inhibitor, and distilled water.
61
What is the purpose of the yoke assembly of the guided missile maintenance platform (GMMP)?
Provides connection between the bucket assembly and the support structure.
Allows the support structure to move left and right inside the launch tube
Raises and lowers the bucket assembly.
Allows electrical signals move threw the support structure/bucket assembly.
62
What type of power do the components in the portable air conditioner (PAC) control panel operate?
30 volts alternating current (VAC), 1-phase, 60 Hertz.
120 VAC, 1-phase, 60 Hertz.
24 volts direct current (VDC).
208 VAC, 3-phase, 60 Hertz.
63
How does a thermocouple function?
A metal strip generates variable voltages depending on the temperature.
A bi-metallic strip generates resistances depending on the temperature
The junction of two dissimilar metals generates voltage depending on temp
The junction of two copper wires generates a standard voltage at all temp
64
(811) What purpose does the pumping unit of hydraulic pusher set serve?
Provides 55-tons of force used to open or close the launcher closure door.
Transfers hydraulic pressure from the pusher unit to the yoke assembly.
Supplies pressurized hydraulic fluid to the pusher unit.
Provides the link between the pusher unit and the launcher closure door

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