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MM1 CH 588 Aircraft elevator > CH 588 Aircraft Elevator and Doors > Flashcards

CH 588 Aircraft Elevator and Doors Flashcards

1
Q

What NSTM is Aircraft Elevators and Deck Edge Elevator and Hanger Division Doors

A

Ch 588

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2
Q

During the life cycle use of a Navy ship, questions concerning the design and maintenance of the aircraft elevator systems and deck edge elevator and hangar division door systems will be promulgated by

A

the Fleet and
Maintenance activities

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3
Q

The Technical Warrant Holder for the aircraft elevator system and deck edge/hangar division doors is

A

NAVSEA 05Z44

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4
Q

When considering stowed elevator overall combined aircraft and/or material parking loads, the total weight limit on the platform surface when locked and stowed is

A

125 percent of the rated load capacity of the elevator

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5
Q

The ends of the wire ropes attach to the platform at two or more hitch points. This arrangement provides

A

a 2:1 ratio of platform movement to traveling sheave movement.

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6
Q

The hoist wire ropes are

A

1-½-inch diameter

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7
Q

Most aircraft elevators utilize stored energy high-pressure hydraulics, up to

A

2,800 psi normal operating pressure

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8
Q

With high-pressure accumulators and air flasks these systems require hydraulic fluid that is a

A

fire-resistant phosphate ester type in accordance with MIL-H-19457

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9
Q

Without stored energy high-pressure accumulators and air flasks. These systems do not require fire-resistant fluid and utilize

A

a petroleum-base type hydraulic fluid in accordance with MIL-PRF-17672.

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10
Q

What controls the flow to and from the hydraulic engine

A

The main control valve

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11
Q

The main pumps draw from the exhaust tank and charge the

A

high-pressure accumulators

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12
Q

All aircraft elevator main pumps are

A

variable displacement, axial piston pumps.

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13
Q

ACE main pumps are controlled by a

A

limit or float/level switches on the high-pressure accumulators

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14
Q

Ship’s high-pressure air system is used to

A

pressurize hydraulic fluid

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15
Q

As hydraulic fluid enters the accumulators or tanks, the gas has no escape and is

A

compressed

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16
Q

In the high-pressure accumulators, what separates the hydraulic fluid from the compressed air

A

a piston

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17
Q

In the high pressure system, what protect the system from over pressurization.

A

relief valve

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18
Q

The rate of fluid flow into the sump and supply/storage tanks must not

A

exceed the venting capacity of the tank vents

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19
Q

Excessive pressure in the supply/storage
tank can lead to

A

rupture of the tank

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20
Q

Excessive pressure in the sump tank can cause

A

rupture of the tank or the pump cases

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21
Q

Normal system internal fluid leakage and drainage from components in the
hydraulic system are

A

collected directly in the vented exhaust tank.

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22
Q

Make-up fluid from the supply/storage tank is transferred

A

as necessary directly to the exhaust tank

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23
Q

The sump pump takes fluid from the sump tank and

A

discharges the fluid to the exhaust tank

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24
Q

The fluid cooling system takes fluid from the exhaust tank

A

and pushes it through a filter and a seawater cooler

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25
Q

If platform speed is low

A

hydraulic flow is increased

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26
Q

If platform speed is excessive

A

hydraulic flow is decreased

27
Q

Aircraft elevator systems use some type of mechanical feedback device

A

shift the main control valve spool.

28
Q

A simplified mechanical feedback device use a

A

planetary gear system

29
Q

When a command is initiated at the control station to raise or lower the platform

A

the solenoid-operated directional control opens and hydraulic fluid is permitted to flow.

30
Q

What compensates for supply pressure variations and provides a constant flow
rate to the hydraulic motor, resulting in a constant speed output from the motor

A

The servo control manifold

31
Q

When a high-speed command is issued from the control stations, pilot pressure shifts the directional control valve to the appropriate position and

A

opens the slow speed valve to allow fluid flow to or from the hydraulic engine.

32
Q

What has radial holes drilled along the length of a sleeve that allow more fluid flow and therefore greater elevator speed with increased displacement of the spool.

A

The sigpot valve

33
Q

The flow rate through the spigot valve, and therefore the maximum elevator speed, is regulated by the

A

compensator valve

34
Q

If the flow rate increases beyond
a certain value,

A

the pilot pressure moves the compensator valve to reduce fluid flow to the spigot valve

35
Q

As the flow through the spigot valve increases,

A

so does the pressure drop across the valve

36
Q

If the flow rate increases beyond a certain value, the pilot pressure moves the compensator valve

A

to reduce fluid flow to the spigot valve

37
Q

Machinery guard safety color code should be in accordance with

A

OPNAVINST 5100.19.

38
Q

The first run of each shift or operating period should be

A

at slow speed

39
Q

What is the the normal and preferred mode of operation since it is the only mode of operation that does not bypass any safety interlocks

A

electric operation

40
Q

If pressure is lost in the accumulators,

A

the sump pump(s) can be used to raise the unloaded elevator platform to the flight deck

41
Q

To lower the platform

A

hydraulic fluid can be bled out of the hydraulic engine.

42
Q

The schedule and criteria for wire rope inspection and lubrication is provided by

A

MRC

43
Q

Who shall report by letter or message to NSWCPD Code 431 and Carrier Planning Activity PMS 312C each time a set of elevator wire ropes is replaced

A

Type Commander

44
Q

The ropes lubricated with wire rope grease in accordance with MIL-PRF-18458

A

MIL-PRF-18458

45
Q

Prior to lubrication, the wire rope should be cleaned using

A

wire brushes, scrapers, compressed
air, MIL-PRF-680 Type III, or turbine oil in accordance with MIL-PRF-17331 (2190)

46
Q

What should be avoided because they also have a tendency to remove the internal lubricant

A

Solvents

47
Q

The tension of wire ropes within a hitch group should be maintained within a

A

5% tolerance

48
Q

All deck edge aircraft elevator wire ropes should be replaced every

A

10 to 12 years

49
Q

The newly installed wire ropes should be tensioned again after

A

6 months of service to compensate for any constructional stretch

50
Q

Fittings should not be tightened while the system is pressurized because

A

this could induce stresses that could cause the piping to rupture.

51
Q

At the start of each shift’s operations

A

Air should be bled from all hydraulic bleed valves

52
Q

Sump and supply/storage tank vents should be inspected every

A

60 days

53
Q

What testing are not required for aircraft elevators

A

static and dynamic

54
Q

The load test requires the test load to be moved through the complete operating range of the elevator for
a minimum of

A

20 cycles

55
Q

If the load test must be accomplished while the ship is at sea, the sea state must be

A

3 or less (Beaufort scale) and the test load should be 80 percent of the rated capacity

56
Q

A typical operational test consists of raising and lowering the platform with no load through five complete
cycles

A

two at slow speed and three at rated speed.

57
Q

New, modified, or overhauled sump tanks or reservoirs should be hydrostatically tested to

A

8 lb/in2 to demonstrate fluid tightness.

58
Q

Overhauled rams, cylinders, accumulators, valves, piping, fittings, and pressure tanks should be hydrostatically tested before installation to

A

135 percent of design pressure and then should be hydrostatically tested to
design pressure after installation to demonstrate that there is no leakage

59
Q

Deck edge elevator doors are designed to open or close in

A

60 seconds

60
Q

Hangar division doors are designed
to open or close in

A

20 seconds

61
Q

To open the door, the operator at the control station must

A

depress or turn the OPEN switch for the duration of door movement

62
Q

To close the door, the operator at the control station must

A

turn or depress the CLOSE switch for the duration of door movement.

63
Q

For emergency manual mode of operation, the locks for the door panels and the drive machinery brake must be

A

disengaged manually during door operation.

MM1 CH 588 Aircraft elevator (28 decks)

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