JOINT FLEET MAINTENANCE MANUAL

COMFLTFORCOMINST 4790.3 REV A CH-1
(3) Communicate with the escort (if escort required) at each 100 feet depth increment or at ten
minute intervals, whichever is sooner. If communications are lost, return to a depth at which
communications can be re-established before continuing (Note 2).
k. At depths listed for hull valve cycling in reference (i) and at the Maximum Authorized Operating
Depth:
(1) Check accuracy of gages and repeaters (Note 3).
(2) Conduct operational test of signal ejectors (Note 4).
(3) Check shaft bearings and stern tubes for excessive heating, leakage and noise. Sealol shaft
seals must be tested at each depth and for the required time, as specified in the approved class
test form.
(4) Cycle rudder and planes through full throw to check for binding. Cycling of rudder and planes
through full throw should be limited to 90% of test depth (Note 5).
(5) Operate all Main Seawater/Auxiliary Seawater hull and back-up valves and those other
seawater system valves worked during the availability (using remote closures, as applicable,
from flooding control stations) that are required to maintain propulsion and other functions
vital to the ship's operation at increments of depth specified in reference (i).
(6) Operate trim and drain pumps, discharging to sea.
(7) Cycle main vents to check for binding.
NOTE: REQUIRED SYSTEMS ARE LISTED IN PARAGRAPH 4b OF REFERENCE (i). OBSERVE
RESTRICTIONS ON OPERATION OF SYSTEMS LISTED IN PARAGRAPH 4d OF
REFERENCE (i). BALL VALVE TRASH DISPOSAL UNITS (TDU) (WITHOUT REMOTE
CLOSURES) WILL NOT BE OPERATED BELOW 200 FEET.
l. Surface fully with EMBT blow in accordance with the applicable URO MRC. Check air bank pressures
before and after blow.
m. Transmit completion of deep dive message.
3. The following tests and evolutions will be carried out submerged following the deep dive:
a. Steering and diving operation at full speed (Note 6).
b. Full power run (Notes 6, 7 and 8).
c. Steep angles - operate ship through several depth changes using large up and down angles to check
operation of ship machinery (Note 7).
I-6D-2