PURPOSE

The arresting gear of tackle-hydraulic type is designed for arrestment of an aircraft, when it is landing on a deck. This purpose is achieved by building up a pressure in the arresting cylinder and throttling the fluid displaced from the cylinder through a variable throttling valve.

DESIGN

The core of the arresting gear is a hydraulic plunger brake joined by the arresting cable with the cross-deck receiving cable via the 18-multiple tackle block, the system of blocks and damping devices.

The arresting gear has the following component parts:

• Arresting engine including:

- hydraulic brake (cylinder-piston rod) with the tackle system creating an arresting force;

- control valve with the mass selector supporting a required pressure in the arresting cylinder according to an aircraft mass;

- hydropneumatic accumulator with the return system accumulating some part of the aircraft kinetic energy. As a result, the arresting gear returns in its initial position and the receiving cable becomes tensioned in the initial position;

- cooling system for taking away the heat liberated at arrestment;

- hydraulic and pneumatic pipelines with the valve system connecting hydraulic and pneumatic elements of the arresting engine.

• Damping device of hydraulic type for reducing overloads at the arrestment initial stage.

• Receiving device including:

- receiving cable for an aircraft arrestment;

- cable hoist and lifting blocks for supporting the receiving cable at a required height.

• Transmitting device including the arresting cable, angle blocks and cable anchor dampers transmitting an arrestment force from the hydraulic brake to the receiving cable.

• Make-up unit for filling-in and replenishment of the arresting engine and damping devices with the working fluid.

• Control boards and units monitoring the arresting gear condition, controlling the mass selector, damping devices, cable hoists and lifting blocks as well as returning the arresting engine in the initial position.

Parameter

Value

Aircraft arresting distance (from the receiving cable initial position to the point of the hook engagement with the receiving cable at the moment, when an aircraft stops its forward movement), m, not over

90…105

Maximum speed of received aircraft relative to the deck at the moment of the hook contact with the receiving cable (disregarding a ship`s speed), km/h, not over

240

Minimum mass of received aircrafts at a speed of 240 кm/h without engines thrust, t

10

Aircraft deceleration at arrestment by the article, g, not over

4.5

Time of lifting the receiving cable, s, not over

15

Working cycle of the article (aircraft arrestment time plus time of the arresting engine return in its initial position), s, not over

25

Time of arrestment mode change by the selector within mass range from 10 to 30 t:

by electric drive, s, not over

by manual drive, s, not over

21

35

Maximum deflection of an aircraft center of mass from the landing strip axis over the whole arresting distance, m, not over

12

Permissible deflection of the hook engagement point with the receiving cable from the landing strip axis, m:

operational

limiting

±3

±5

Power consumption, кW:

mechanisms electric drives – three-phase a.c., 380 V, 50 Hz, not over

monitoring equipment – one phase a.c., 127 V, 50 Hz, not over

control equipment – d.c., 24 V, pulsation factor up to 10%, not over

7

1

0.8

Compressed high-pressure air to be consumed, MPa (кgf/сm2)

15 (150)

Article mass (without SPTA and working fluid), kg

82 000 ±4100

Arresting gears for take-off and landing systems