CH 588 Aircraft Elevator and Doors

Question 1

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

Answer 1

Ch 588

Question 2

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

Answer 2

the Fleet and
Maintenance activities

Question 3

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

Answer 3

NAVSEA 05Z44

Question 4

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

Answer 4

125 percent of the rated load capacity of the elevator

Question 5

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

Answer 5

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

Question 6

The hoist wire ropes are

Answer 6

1-½-inch diameter

Question 7

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

Answer 7

2,800 psi normal operating pressure

Question 8

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

Answer 8

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

Question 9

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

Answer 9

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

Question 10

What controls the flow to and from the hydraulic engine

Answer 10

The main control valve

Question 11

The main pumps draw from the exhaust tank and charge the

Answer 11

high-pressure accumulators

Question 12

All aircraft elevator main pumps are

Answer 12

variable displacement, axial piston pumps.

Question 13

ACE main pumps are controlled by a

Answer 13

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

Question 14

Ship’s high-pressure air system is used to

Answer 14

pressurize hydraulic fluid

Question 15

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

Answer 15

compressed

Question 16

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

Answer 16

a piston

Question 17

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

Answer 17

relief valve

Question 18

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

Answer 18

exceed the venting capacity of the tank vents

Question 19

Excessive pressure in the supply/storage
tank can lead to

Answer 19

rupture of the tank

Question 20

Excessive pressure in the sump tank can cause

Answer 20

rupture of the tank or the pump cases

Question 21

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

Answer 21

collected directly in the vented exhaust tank.

Question 22

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

Answer 22

as necessary directly to the exhaust tank

Question 23

The sump pump takes fluid from the sump tank and

Answer 23

discharges the fluid to the exhaust tank

Question 24

The fluid cooling system takes fluid from the exhaust tank

Answer 24

and pushes it through a filter and a seawater cooler

Question 25

If platform speed is low

Answer 25

hydraulic flow is increased

Question 26

If platform speed is excessive

Answer 26

hydraulic flow is decreased

Question 27

Aircraft elevator systems use some type of mechanical feedback device

Answer 27

shift the main control valve spool.

Question 28

A simplified mechanical feedback device use a

Answer 28

planetary gear system

Question 29

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

Answer 29

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

Question 30

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

Answer 30

The servo control manifold

Question 31

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

Answer 31

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

Question 32

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.

Answer 32

The sigpot valve

Question 33

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

Answer 33

compensator valve

Question 34

If the flow rate increases beyond a certain value,

Answer 34

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

Question 35

As the flow through the spigot valve increases,

Answer 35

so does the pressure drop across the valve

Question 36

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

Answer 36

to reduce fluid flow to the spigot valve

Question 37

Machinery guard safety color code should be in accordance with

Answer 37

OPNAVINST 5100.19.

Question 38

The first run of each shift or operating period should be

Answer 38

at slow speed

Question 39

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

Answer 39

electric operation

Question 40

If pressure is lost in the accumulators,

Answer 40

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

Question 41

To lower the platform

Answer 41

hydraulic fluid can be bled out of the hydraulic engine.

Question 42

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

Answer 42

MRC

Question 43

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

Answer 43

Type Commander

Question 44

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

Answer 44

MIL-PRF-18458

Question 45

Prior to lubrication, the wire rope should be cleaned using

Answer 45

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

Question 46

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

Answer 46

Solvents

Question 47

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

Answer 47

5% tolerance

Question 48

All deck edge aircraft elevator wire ropes should be replaced every

Answer 48

10 to 12 years

Question 49

The newly installed wire ropes should be tensioned again after

Answer 49

6 months of service to compensate for any constructional stretch

Question 50

Fittings should not be tightened while the system is pressurized because

Answer 50

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

Question 51

At the start of each shift’s operations

Answer 51

Air should be bled from all hydraulic bleed valves

Question 52

Sump and supply/storage tank vents should be inspected every

Answer 52

60 days

Question 53

What testing are not required for aircraft elevators

Answer 53

static and dynamic

Question 54

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

Answer 54

20 cycles

Question 55

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

Answer 55

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

Question 56

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

Answer 56

two at slow speed and three at rated speed.

Question 57

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

Answer 57

8 lb/in2 to demonstrate fluid tightness.

Question 58

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

Answer 58

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

Question 59

Deck edge elevator doors are designed to open or close in

Answer 59

60 seconds

Question 60

Hangar division doors are designed to open or close in

Answer 60

20 seconds

Question 61

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

Answer 61

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

Question 62

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

Answer 62

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

Question 63

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

Answer 63

disengaged manually during door operation.