Hold back track filler blocks
The communications system among the various
catapult stations should be thoroughly checked out.
Sufficient sound-powered phones should be on hand to
replace those phones that are inoperative.
Hand signals used in the spotting and
launching of aircraft during catapult operations
are found in the Air-man manual, NAVEDTRA
12000 and in NAVAIR 00-80T- 105, the CV
Preliminary functional tests are performed by all
operating personnel. These tests consist of at least two
no-load launchings, during which the control system is
operated through its complete cycle. The functioning of
as many component parts of the catapult as possible
should be observed by personnel at the various stations
during the preliminary functional tests. All malfunctions
must be reported to the catapult officer or petty officer
During periods when no aircraft are to be launched
but the catapult is in a UP status, execute all preopera-
tional inspections, including firing of two no-loads,
using the lubrication system liberally before each launch
and retraction. This should be accomplished every 2
No-Load Test Launchings
No-load launching pressures are according to the
data given in the preoperational inspection on MRCS.
At no time must no-loads be fired with pistons out of
the BATTERY position.
Station sufficient personnel along the catapult track
to ensure safe operations while testing the catapult.
Perform the following steps before the no-load test
1. Remove and stow the track slot seal. Assure
that the launching area is clear.
2. Position all valves, gauges, and vents according
to tables in the current MRCs.
3. Check that all communications are complete.
4. Check that track covers and shuttle spreader are
5. Check the operation of all pumps and motors.
6. Visually check the condition of the water
brakes and piston spears.
7. Check to ensure that the water level in the
water-brake reservoir is within 6 inches of the bottom
of the safety screen.
8. Check the water-brake pump suction, discharge,
and cylinder elbow pressure. The pump gland should
not leak more than a few drops per minute. Check the
bearing temperature and watch for any sudden rise in
9. Maintain a close watch on all pressures and
temperatures and adjust as necessary.
10. With the retraction engine accumulator charged
to the required operating pressure, set the bridle
tensioner pressure regulator valve to give the required
tensioning force at the shuttle.
11. Ensure that the lube supply tank is filled to the
12. Turn the lubrication pump ON.
13. Assure that launching steam bypass valves (for
internal preheat) are CLOSED.
14. Charge the steam receivers to the appropriate
no-load pressure setting.
15. Be sure cylinder elongation is within scale for
the type of catapult.
16. Be sure the hydraulic system is filled, vented,
and properly charged, with no leakage from the piping.
17. On C-13 catapults, check that low-pressure air
is available to the air-operated solenoid valves.
The low-pressure air is secured to the deck
tensioner during no-loads. This is done to
prevent the tensioner piston from extending and
knocking out STANDBY or possibly causing
damage to the grab.