CATAPULT CONTROL SYSTEMS
LEARNING OBJECTIVES: Describe the
components of the catapult control systems.
Describe the function of the catapult control
The control system of a steam catapult consists of
those panels, lights, and switches that are used to
operate a catapult throughout the various operational
ELECTRICAL CONTROL SYSTEM
The electrical control system for a steam catapult
consists of various control panels that govern the
operation of the catapult in conjunction with control
components of other systems.
Included among the components of the catapult
electrical control system are various push buttons,
switches, solenoids, relays, circuit breakers, fuses, and
lights. The ICCS, CCP, and the main control console is
the focal point of all functions of the catapult electrical
Electrically operated solenoid valves produce
mechanical operation of valves throughout the catapult.
Buttons actuate some solenoid valves, while others
function automatically during catapult operation.
Various changes that occur during catapult operation
are sensed by limit switches and pressure switches.
Operation of these switches actuates lights at various
control panels. The following paragraphs briefly
describe some of these components. For information on
the function and interrelationship of the electrical
components in a specific system, study the schematic
diagrams in the technical manual for that particular
type of catapult.
A solenoid (fig. 4-51) is an electromagnet formed
by a conductor wound in a series of loops in the shape
of a helix (spiral). Inserted within this spiral or coil are a
soft-iron core and a movable plunger. The soft-iron
core is pinned or held in position and therefore is not
movable. This movable plunger (also soft iron) is held
away from the core by a spring in the de-energized
When current flows through the conductor, a
magnetic field is produced. This field acts in every
respect like a permanent magnet having both a north
and south pole.
As shown in figure 4-51, the de-energized position
of the plunger is partially out of the coil, because of the
UNLOCKED POSITION - APPROACHING SHUTTLE
LATCHED & LOCKED TO SHUTTLE
UNLOCKED - SHUTTLE FREE TO MOVE FORWARD
3. Manual-release arm
4. Latch spring
5. Grab latch
6. Shuttle clevis pin
7. Cam detent
8. Cam follower
9. Lock block
10. Manual-release-arm stop
11. Bridle-tensioner buffer cap
12. Manual-release disengaging lever
Figure 4-50.Grab operation sequence.