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Rescue Swimmer Lanz 14 > LOX > Flashcards

LOX Flashcards

1
Q

LOX characteristics

A
  1. boils at -297F(183C)
  2. 1 cubic ft of lox expands to 860 cubic ft of gas at 70F(21C) sea level(860 times)
  3. 1.14 times heavier than water and weighs 9.527 lbs per gallon
  4. 25 liters of lox converts to 18,974 liters of gaseous O2
  5. pale blue liquid, exists in liquid state from temps -182.5 C- 297F

M13520.1C 5-5

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2
Q

LOX cart

A
  1. servicing cart 1200lbs, designed to store 50 gL of lox.
  2. space b/w the inner and outer shell on the cart is called the annular space
  3. 300 psi lox in system
  4. operates 270-455psi in static system/ 270-340psi under continuous breathing
  5. 6 supply regulators in flight station, 4 in cargo compartment
  6. service cart wheels to 12-15 psi
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3
Q

LOX USES

A
  1. @ 30,000ft and above 100% O2 will be delivered
  2. LOX qty(A) light comes on when supply drops below 5.0 L
  3. LOX qty LOW (C) light comes on when supply drops below 2.5 L
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4
Q

_____ shall be used specifically as a thread sealant

A

teflon tape

molybdenum disulfide shall be used on stainless steel flared fittings and on those applications where teflon tape cannot be used

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5
Q

When warmed to ambient temperature LOX expands to a gas ___ times its liquid volume

A

860:1

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6
Q
  1. What Is used to lubricate the parking brake on the LOX cart
  2. What do you lubricate the handbrake release handle and linkage with?
A
  1. mil-m-7866 graphite
  2. Lubricating oil mil-prf-6086 grade M

MPC 350020.0 p.19

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7
Q

In what manner shall the vent valve be when the cart is parked or being transported?

A

LOX carts shall be parked with the vent valve open and transported with the vent valve closed

TO 00-25-172 p. 4-14

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8
Q

What PPE is required for servicing LOX

A

Face shield, gloves(thermal insulated or leather welding), coveralls(cotton), apron(impermeable cotton duck, coated with rubber, boots

M13520.1C 5-6

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9
Q

LOX trailer inspect interval

A

Inspect, clean, grounding reel- 30 days reference AFTO 37C2-8-3-13, NAVAIR 19-25D-33, AFTO 37A19-3-2, AFTO 37C2-8-3-11
inspect, clean, lubricate- 90 day
inspect, clean, lubricate- 180 day

CGTO PG-85-00-310-A 5-3

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10
Q

How close should fire protection be when servicing

A

50 ft

MPC 350020.0 P. 5

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11
Q

What is the LOX safety zone

A

20 ft radius

MPC 350020.0 P. 5

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12
Q

If LOX spills on asphalt or concrete expansion joint sealant, stop servicing or other operations within a __ __ __ of area…..do not walk or roll equipment over the area of spill for at least __ __

A

20 ft radius
30 minutes

MPC 350020.0 P. 6

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13
Q

What do you wash the service cart filler valve and airplane fill build up valve with

A

Octagon OCC(NOC)

MPC 350020.0 P. 6

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14
Q

What are the parking rules for the cart

A
  1. 25 ft from any structures having fire resistant or non-combust
    ible exterior walls with automatic fire extinguishing systems
  2. 50 ft from combustible structures sources of ignition, heavy
    traffic areas or smoking areas
  3. 75 ft from airplane parking, fueling, or defueling areas
  4. parked with vent valve open and transported with it closed
  5. parked with the rear end is higher than the front end or the control
    panel is higher than the towing end

MPC 350020.0 P. 6

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15
Q

What are the tires inflated to

A

12-15 psi

MPC 350020.0 P. 10

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16
Q

What do you lubricate the cover hinge and latch of the servicing tank with

A

MIL-PRF-6086

MPC 350020.0 P. 17

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17
Q

What do you lubricate the handbrake release handle and linkage with

A

MIL-PRF-6086

MPC 350020.0 P. 19

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18
Q

No reading above __ __ should be read for electrical resistance for the static points

A

10 ohms

MPC 350020.0 P. 18

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19
Q

What do you lubricate the grease fitting at the bottom of the handbrake lever mechanism and caster wheel swivel joint, pivot sleeve, and locking pin with

A

Automotive Grease MIL-PRF-10924

MPC 350020.0 P. 23

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20
Q

What do you coat the 2 screws that secure the static grounding cable to the grounding clip with

A

Silicone sealant MIL-A-46146

MPC 350020.0 P. 24

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21
Q

How many turns for the 50ft and 75ft grounding reel

A

50ft- 36 full turns
75ft- 47 full turns

AFTO 37A19-3-2 5-3

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22
Q

How close should the fire protection equipment be to the LOX servicing operation

A

50 ft

MPC 121401.0 p.2
HC 130J

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23
Q

What should be turned off when servicing LOX

A

Electrical systems not required for servicing

MPC 121401.0 p.2
HC 130J

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24
Q

How large is the radius of the safety zone during oxygen servicing

A

20ft

MPC 121401.0 p. 2
HC 130J

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25
Q

What maintenance and other servicing operations do you not service oxygen concurrently with

A

Fuel, oil, water-alcohol, hydraulic fluid, environmental fluid, or any systems containing such hydrocarbon based products

MPC 121401.0 p.2
HC 130J

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26
Q

What do you do when LOX has come in contact with skin

A

Transport immediately to nearest medical facility. Do not attempt to rewarm affected body parts

MPC 121401.0 p.3
HC 130J

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27
Q

Do not allow LOX to come in contact petroleum products, asphalt, or concrete expansion joint sealant for what reason

A

Fire or explosion may result.
If it occurs stop all operations with 20ft radius of spill and do not walk or roll equipment over the are for at least 30 minutes, waiting until all fog or frost has disappeared.

MPC 121401.0 p.3
HC 130J

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28
Q

What do you wash the service cart filler valve(hose adapter) and the airplane fill-buildup-vent valve with

A

Octagon OCC (NOC)

MPC 121401.0 p.3
HC 130J

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29
Q

When parking or storing carts with containers of LOX or gaseous oxygen carts shall be parked as follows

A
  1. At least 25 ft from any structure having fire resistant or non-combustible exterior walls or with automatic fire extinguishing systems
  2. At 50 ft from any combustible structure or sources of ignition including heavy traffic areas where equipment is in operation or smoking areas
  3. At 75ft from airplane parking fueling or defueling areas
  4. LOX carts shall be parked with the vent valve open and transported with the vent valve closed

MPC 121401.0 p.3
HC 130J

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30
Q

How should the cart be positioned when servicing a plane

A

As far away from plane as allowed by length of hose. Ensure the front of the cart, tow hitch, is facing aft of the aircraft with control panel positioned perpendicular to servicing port

MPC 121401.0 p.4
HC 130J

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31
Q

What is the first step after positioning the LOX cart

A

Set service cart parking brake(automotive type parking brake)

MPC 121401.0 p.4
HC 130J

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32
Q

What do you do before positioning oxygen cart(LOX)

A

Conduct ramp inspection within a 20ft radius of servicing are, ensuring area is free of petroleum products

MPC 121401.0 p.4
HC 130J

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33
Q

What is 2nd step after positioning LOX cart to plane

A

Connect ground wire from service cart to same static ground that the airplane is grounded to

MPC 121401.0 p.4
HC 130J

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34
Q

What do you clean aircraft filler valve with

A

Oxygen cleaning compound Octagon OCC (NOC), using a lint free cloth

MPC 121401.0 p.5
HC 130J

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35
Q

When purging service hose what pressure do you build to and maintain

A

40 psi (+-5)

MPC 121401.0 p. 5
HC 130J

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36
Q

How many and what valves to you open and close when purging the service hose

A

4
Build up valve, vent valve, service valve, service drain valve

MPC 121401.0 p.5
HC 130J

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37
Q

What valve is used to maintain the 40(+-5)psi needed for purging and serving oxygen system

A

Buildup valve(and/or vent valve for purging)

MPC 121401.0 p.5
HC 130J

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38
Q

What manual can you find LOX system servicing information

A

CGTO 1C-130J-2-35JG-00-1

MPC 121401.0 p.2
HC 130J

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39
Q

What is the number for the LOX servicing cart

A

TMU-27/M

MPC 121401.0 p.2
HC 130J

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40
Q

What fire extinguisher is used when servicing LOX

A

HALON 1211 (150 pounds)

MPC 121401.0 p.2
HC 130J

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41
Q

What directive gives proper protective equipment/clothing approved for lox and the material and tools being used

A

TO 00-25-172

TO 15X-1-1 P. 18 XVI

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42
Q

What is the standard workbench size

A

34in high by 30in wide by 72in long

2-1/2 X 2-1/2 feet cubicles of work area for each mechanic

TO 15X-1-1 P. 31(2-3)

43
Q

What is the minimum size of the oxygen equipment fitting area

A

50 sq ft it allows for the fitting of 2 people

TO 15x-1-1 p. 33(2-5)

44
Q

No open flames or smoking for aminimum distance of ____ ft. from oxygen source

A

50 ft

TO 15X-1-1 p. 5-2

45
Q

If the pressure falls below this value, moisture is very likely to accumulate in the cylinders.

A

5 pounds per square in(PSI)

TO 15X-1-1 p 5-2

46
Q

What type of boots should be worn for LOX

A

leather boots with close fitting tops of approximately 8 inches in height and preferably neoprene soles and heels are recommended.

TO 15X-1-1 P 5-3

47
Q

The pressure relief assembly in a LOX system should consist of one re-seatable relief valve and one rupture disk in parallel. Dewars should be equipped with rupture disks set for pressures about ____ percent above the working pressure of the vessel.

A

25 %

TO 15X-1-1 P 5-4

48
Q

Oxygen cylinders, when empty, are required to have ___ to ___ pounds per square inch gauge(psig) pressure

A

5-24

TO 15X-1-1 p 5-4

49
Q

What do you do with parts removed from the lox cart for maintenance

A

Sealed in polyethylene bags and all anti seize tape must be removed and replaced on threaded parts. When replacing anti seize tape start with the 3rd thread from the end

Navair 19-25D-33 p.65

50
Q

What do you clean and dry LOX cart tank integral parts(breathing oxygen equipment) with

A

Clean-ultrasonic cleaning with solvent, agitate
Drying-purge and blow dry components with oil free gaseous nitrogen

NAVAIR 19-25D-33 p. 121

51
Q

How long do you pass hot dry nitrogen through the TMU/27 cart tank during a hot purge

A

At least 2 hours at moderate flow

NAVAIR 19-25D-33 p. 122

52
Q

What should the pressure be regulated to for the aircraft inner tank otherwise the use of the overboard vent system is required

A

5-40 psi

T.O. 37C2-M.-127 p. 4-1

53
Q

Apply tape to male pipe threaded fittings beginning with the _____ thread from the end of the fitting

A

Second
This is for shipping a lox storage or transfer tank. Im not sure if this is for the the fittings on the aircraft system or the tank being transferred Navair 19-25d-33 says third thread on TMU/27 cart.

T.O. 37C2-8-1-127 p.3-1

54
Q

What do you do with the lox and pressure in a tank being shipped

A

Purge all lox and charge tank with 15-25 psi of nitrogen

T.O. 37C2-8-1-127 p. 3-1

55
Q

What manual hold the LOX safety precautions that all personnel shall adhere to

A

TO 15X-1-1

TO 1C-27J-2-2CL-4 p. 3

56
Q

LOX boil off can be reduced by positioning the storage tank how

A

The rear end is higher than the front end

MPC 350020.0 p.8 Note

57
Q

Due to the high volume of gaseous oxygen required for purging, it is recommended that when using the LMO5HP liquid oxygen storage cylinder, it should not be more than _____ percent full.

A

75 percent

MPC 351010.0 p. 4

58
Q

Position LMO5HP liquid oxygen storage cylinder (1) approximately ___ feet from aircraft oxygen servicing panel

A

15 ft

MPC 351010.0 p.4

59
Q

EQUIPMENT SUPPLYING GASEOUS OXYGEN FOR HOTPURGING MUST HAVE SUFFICIENT QUANTITY TO MAINTAINA CONSTANT FLOW AT 90 PSI FOR how long

A

100 minutes

MPC 351010.0 p. 4

60
Q

Ensure electrical power cart has enough fuel to supply power for at least ____ minutes.

A

90 minutes

351010.0 p. 4

61
Q

How far do you position the power cart from the LMO5HP liquid oxygen storage cylinder.

A

50 ft

MPC 351010.0 p. 4

62
Q

How far do you position the LMO5HP liquid oxygen storage cylinder from the aircraft being serviced

A

15 ft

MPC 351010.0 p. 4

63
Q

How soon after a hot purge do you service liquid oxygen system

A

Within 1 hour IAW MPC 121401.0

MPC 351010.0 P.6

64
Q

How much dwell time do you allow after LOX servicing

A

30 minutes

MPC 351010.0 p. 7

65
Q

How long do you purge the demand side of oxygen system

A

10 minutes

MPC 351010.0 p.7

66
Q

Oxygen cylinders and LOX containers should have their psi dropped to how much for shipping commercially

A

24 psi

TO 15X-1-1 p 3-2

67
Q

Air pressure should be regulated to less than what psi when using compressed air in the LOX environment

A

30 psi

TO 15X-1-1 P XVII

68
Q

The greatest danger during flight of lack of oxygen is at what altitudes

A

Between 20,000 and 30,000 ft

TO 15X-1-1 P 1-5

69
Q

Without oxygen at what altitude is night vision subnormal

A

10,000 ft

TO 15X-1-1 P 1-5

70
Q

After thoroughly cleaning oxygen components how do you check cleanliness

A

Under a black light

TO 15X-1-1 P 2-1

71
Q

Any cleaned parts that are stored more than ____ days prior to assembly shall be recleaned

A

30 days

TO 15X-1-1 P 2-1

72
Q

In those areas where spillage of LOX is likely to occur, the ventilation equipment shall have the capacity to provide ____ to ____ air changes per hour.

A

20-40

TO 15X-1-1 P 2-1

73
Q

What is considered to be the minimum size for an oxygen shop

A

1000 square ft

TO 15X-1-1 P 2-3

74
Q

For easy record keeping all charts, graphs, records, and other required material should be located within ____ feet of the desk.

A

3 ft

TO 15X-1-1 P 2-7

75
Q

There are three types of oxygen flight stations. What are they

A

Demand type, pressure demand type, and continuous flow type

TO 15X-1-1 P 3-1

76
Q

How do you distinguish between high pressure and low pressure cylinders

A

Low- yellow 300-475 psi
High- green 1800-2100 psi

TO 15X-1-1 P 3-3

77
Q

What is the chief advantage of a high pressure cylinder

A

Minimum amount of space utilized

TO 15X-1-1 P 3-3

78
Q

How are aircraft oxygen lines marked

A

Late models- marked with a single green band
Early models- marked with a band colored light green-yellow light green and distribution lines marked with a band colored light green

TO 15X-1-1 p 3-16

79
Q

How many threads do you apply anti seize table to for pipe tubing

A

First thread in the direction of spiral

TO 15X-1-1 p 3-18

80
Q

ABO has a minimum purity disregarding moisture content of what percentage by volume

A

99.5

TO 15X-1-1 p 5-1

81
Q

To remove residue from oxygen lines and fittings use a suitable cleaning compound and how do you dry

A

Air dry or force dry with heated nitrogen

TO 15X-1-1 p 5-2

82
Q

Oxygen cylinders depleted to what psi must be tagged out and segregated from other cylinders

A

5 psi

TO 15X-1-1 p 5-4

83
Q

For oxygen systems, how often should you change the purifier cartridge

A

Every 16 cylinders ( or every 2 carts)

TO 15X-1-1 p 6-1

84
Q

Any flame producing activity shall not be performed within how many feet of servicing activity

A

50 ft

TO 15X-1-1 p 6-8

85
Q

What size should the drip pan or sheet of metal be for overflow

A

4 x 4 ft

TO 15X-1-1 p 6-9

86
Q

How many turns of anti seize tape do you apply to the threads of the cylinder regulator

A

2 turns to all threads but first 2 male threads

TO 15X-1-1 p 7-1

87
Q

Oxygen system post and pre flight inspects should be done with what requirements

A

Ch 7 of TO 15X-1-1 Manual

TO 15X-1-1 p 7-3

88
Q

How often should LOX systems be hot purged

A

200 hours

TO 15X-1-1 p 7-66

89
Q

What size limit on high pressure bottles require no hydrostatic testing

A

Less than 2 in diameter and less than 24 in length

TO 15X-1-1 p 7-68

90
Q

What is the oven temperature set to for drying oxygen systems

A

122 C, 250 F

TO 15X-1-1 p 8-3

91
Q

As a safety precaution to avoid the possibility of electrical power being applied or disturbance of static grounds during servicing of liquid oxygen (LOX) systems Two signs each should be placed approximately ____ (ft) from the right and left side, with one at the forward end of the aircraft and the second sign at the rear.

92
Q

In aircraft having the filler lines connected on one end of the cylinder and distribution lines connected to the opposite end of the cylinder, purging will be accomplished by connecting a servicing trailer to the aircraft filler valve and with all regulators open, passing oxygen through the system for at least ____ minutes with apressure of 50 psi at the filler valve.

A

30 minutes

TO 15X-1-1 P 9-4

93
Q

when transporting lox converters The effected equipment is designed to endure forces fully serviced of ____ G vertically downward, ____ G vertically upward, and ____ G laterally. Forces greater than those stated may be considered as damaging.

A

14 G
6 G
10 G

TO 15X-1-1 P 9-6

94
Q

When transporting lox converters A suitable vehicle for transporting the equipment is a pickup or an equivalent vehicle with an open bed that will accommodate an isolation container to protect personnel and other equipment. The speed of stated vehicle should be limited to ____ MPH when transporting the converters and rough terrain should be avoided.

A

15

TO 15X-1-1 P 9-6

95
Q

How long is the evaporation or heat loss tests on LOX converters

A

24 hours

TO 15X-1-1 p 9-15

96
Q

What is the criteria for the bands on oxygen tubing identifying burnished areas

A

Minimum of 2 inch max of 3 in. Black tubing gets a green band and green or unfinished tubing gets a black band

TO 15X-1-1 p 9-16

97
Q

What is the minimum purge time for the 5 and 10 liter converters

A

5 L- 20 minutes
10 L- 30 minutes
25 L and 75 L- 45 minutes

Plug power cable of purge kit into any source of 115 V ± 5 V, 60 or 400 cycle, with outlet rated at 1,200 watts minimum.

TO 15X-1-1 p 9-21

98
Q

When purging a converter 10 L or less what psi do you regulate the source supply pressure regulator to

25 L or more

A

100 +- 10 psi
130+- 5

TO 15X-1-1 p 9-24, 9-30

99
Q

The converter weight shall be calibrated to what

A

12 ounces of specified limit

TO 15X-1-1 p 9-25

100
Q

When inspecting the cleanliness of lox components how is the bright white light test completed

A

Light of 100 ft candles, hold the flashlight no more than 18 inches away

TO 15X-1-1 p 10-1

101
Q

Cylinders coded 3A or 3AA by the Department of Transportation (DOT) specification, Title 49 have a service life limit of how long

A

No life limit

TO 15X-1-1 p 7-68

102
Q

Cylinders coded 3HT require a hydrostatic test every ____ years and must be condemned at ____ years

A

Hydro-3
Condemned- 24

TO 15X-1-1 p 7-68

103
Q

Welded cylinder do not require a dot stamp or life limit but do require hydro every ____ years

A

5 years

TO 15X-1-1 p 7-68

104
Q

LOX rules

A
  1. clean copper, aluminum, or SST drip pans must be placed under outlet overflow vents of servicing units
  2. do not completely leave valves open, initially completely open valves then close them 1/4 turn to prevent valves from freezing in open posit.
  3. PPE- face shield, gloves, coveralls, apron, shoes.

Rescue Swimmer Lanz 14 (55 decks)

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