JOINT FLEET MAINTENANCE MANUAL

COMFLTFORCOMINST 4790.3 REV A CH-5
(3) Communicate with escort at each 100 feet depth increment or at 10 minute intervals,
whichever is sooner. If communications are lost, return to depth at which communications can
be reestablished before continuing. (see Note 7).
k. At depths listed for hull valve cycling in reference (i) (as applicable) per NAVSEA approved Deep
Dive Test Form:
(1) Check accuracy of gages and repeaters.
(2) Conduct operational test of signal ejectors. (see Note 8).
(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. (see Note 9).
(5) Operate all hull and back-up valves (using remote closures, as applicable, from flooding
control stations) of seawater systems required to maintain propulsion and other functions vital
to the ship's operation at increments of depth specified in reference (i). Required systems are
listed in paragraph 4.b. of reference (i). Observe restrictions on operation of systems listed in
paragraph 4.d. of reference (i).
(6) Check operation of bulkhead flappers and watertight doors for binding.
(7) Operate trim and drain pumps, discharging to sea.
(8) Cycle components of each torpedo tube. Check for leakage. Establish integrity of torpedo
tubes by admitting sea pressure through equalizing lines or flooding connection before cycling
components (see Notes 3, 8 and 16).
(9) Vent negative tank inboard (if installed). (see Notes 3 and 10).
(10) Cycle main vents to check for binding.
l. At maximum authorized operating depth:
(1) Repeat item 2.k.(1) of this appendix - Depth gages and repeaters.
(2) Operate each signal ejector by impulse and hand, as applicable. (see Notes 3 and 8).
(3) Repeat item 2.k.(3) of this appendix - Shafting and bearings.
(4) Repeat item 2.k.(5) of this appendix - Hull and back-up valves.
(5) Repeat item 2.k.(6) of this appendix - Bulkhead flappers and watertight doors.
(6) Repeat item 2.k.(7) of this appendix - Trim and drain pumps.
(7) Repeat item 2.k.(8) of this appendix - Torpedo tubes. (see Notes 3 and 16).
(8) Repeat item 2.k.(9) of this appendix - Negative tank (if applicable).
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