3,
Missile Functions
The launch relay in the missile supplies a signal to the arming
and fuzing section which unlocks tthe timers in the safing and arming device
and in the arming-fuzing timer assembly. The launch relay is energized
at the time of launch and is de-energized. by the physical separation of
the missile from the launch pad; the signal is supplied to the arming and
fuzing section through normally-closed contacts as the relay falls out.
Fallout of the relay also starts the program device. The launch relay is
interlocked electrically with other missile functions so that the launching
sequence is discontinued if the relay drops out prematurely, prior to the
start of thrust buildup.
The missile program device is a timer which utilizes a tape recording to deliver signals at predetermined intervals to various missile and
arming and fuziing components. A signal is generated by the guidance computer
for the ejection of an instrumented pod shortly before cutoff, Ejection of
this pod then starts a timer which provides the cutoff signal to the rocket
motor, and initiates the guidance check interval, during which missile velocities and displacement in certain planes must be correct in order to release one of the detents in the safing and arming device. Another signal
is supplieg 15 seconds after cutoff which releases the fourth detent in the
safing and arming device, allowing it to close arming switches, This same
signal activates the 26+volt batteries and starts the fuzing timers in the
arming and fuzing section.
Ground Equipment
The T-4007 Control and Monitor Panel is used in the bunker to con-
trol and/or monitor the warhead electrical systen, the safing and arming
device, and the arming and fuzing timer. This panel monitors the continuity
circuits in these three areas and operates the warhead armfsafe switch, In
normal sequence of operation, the safe conditon of the warhead arm/safe
switch is monitored first; the continuity circuits in the safing, arming,
and fuzing areas are monitored; and then the continuity circuit in the war-
head is monitored,
The warhead arm/safe switch is then armed. Electrical
interlocks prevent arming of this switch unless the continuity circuits are
satisfactory. In addition, resistors in the T-4007 limit the monitor
current to 28 milliamps nominal. This value is below the threshold operating level for all of the components in the areas being monitored, thereby
preventing any serious consequences in the event of a short cirmcit between
a continuity circuit and an active circuit.
ATOMIC ENERGY ACT 1954