handle from the EMERGENCY position until
directed to do so by the catapult officer.
No person is to perform any actions
required by the main-control-console operator.
Under no circumstances is the shuttle to be
maneuvered aft before the launching valve
cutout valve is rotated to the EMERGENCY
position, as such action can cause an accident.
The catapult crew must not approach
the aircraft until it has been UNTENSIONED
and is clear of the shuttle throat.
After the launch bar has been raised, the catapult
officer gives the THROTTLE BACK signal to the pilot,
and the aircraft is removed from the catapult.
The launching officer should not signal the
pilot to THROTTLE BACK until he or she has
positively determined that the catapult shuttle is
forward of the launch bar, except for the
following emergency condition: If the launch
bar cannot be raised without sending personnel
under the turned-up aircraft, the launching
officer should positively determine that the
catapult is in the safe condition, then step in
front of the aircraft wing and give the
THROTTLE BACK signal to permit safe
removal of the aircraft.
After the aircraft is removed from the
catapult, reduce the steam receivers to no-load
pressure; then operate the control system
through the entire operating cycle to determine
and eliminate the cause of hangfire before
INTERMEDIATE LAUNCHINGS. Intermediate
launchings are carried out in the same general manner
as the first launching. If the catapult is being operated
as one of the interlocked pair, the first catapult to reach
STANDBY is fired first. Care must be taken through a
prolonged series of launchings to make sure the cylin-
der elongation is maintained as prescribed by NAEC.
Operate the water-brake pump to obtain desired
vacuum and water pressure. Maintain the level of the
water in the water-brake reservoir within 6 inches of the
safety screen. Maintain the water tank temperature
between 40 and 180°F. If water in the tank rises above
180°F, add water through the tank fill lines. Drain off
hot water through the tank overflow line.
Maintain the water-brake pumps in operating
condition. The bearing temperature should not exceed
180°F. Watch for a sudden rise in temperature. Gland
leak-off is to be several drops per minute, but there
must not be an excessive flow.
Maintain a close watch of the inlet elbow pressure.
An increase of 10 psi above normal operating pressure
or a maximum of 70 psi indicates a possible restriction
in the annulus ring and calls for a shutdown for
Maintain proper charging pressures in all parts of
the hydraulic system throughout a series of launchings.
Adjust pressure as required to maintain at
Monitor the entire catapult system closely for
broken or loose parts, the piping and valves for leaks,
and the cable system for damage and wear. Keep all
tools and loose gear clear of the retraction engine and
Maintain a close watch on all temperatures; adjust
as required to maintain at prescribed settings. Watch all
equipment located in the control console room closely.
Check for loose nuts and bolts, leaks in valves and
piping, and any malfunction in the operating units.
Operation of the catapult must be conducted with
steam pressures prescribed by the catapult officer.
Maintain steam receivers at launching pressure as
specified by the catapult officer.
Maintain communication with all stations. Keep a
catapult log at the control console, and keep the shot
logs up to date.
LAST LAUNCHING. Certain procedures must
be followed to secure the catapult after the last aircraft
Under normal operating conditions, the catapult
must always be secured with the pistons bottomed in
the water brakes and with the pumps secured.