JOINT FLEET MAINTENANCE MANUAL

I-4F-5
COMFLTFORCOMINST 4790.3 REV A CH-1
TABLE 1. SUMMARY OF SIGNIFICANT UNDERWAY TRIAL REQUIREMENTS
Sea Trials Initial Tightness Dive Transit Deep Dive
Policy References Appendix D,
paragraph 2 of this
chapter.
Appendix F,
paragraph 1 of this
chapter.
Appendix F,
paragraph 2 of this
chapter.
Start Depth Surface Surface to 400 ft. Surface to 400 ft.
Conduct Depth Periscope depth or
about 150 ft for SSN
688 Class (155 ft for
SSN 774 Class),
(160 ft for SSN 21
and SSBN/SSGN
726 Class) if sea
state dictates for
trim. Remaining
events of Appendix
D, paragraph 2 of
this chapter no
deeper than 200 ft.
Maximum Keel
Depth
Finish Event Surface from 200 ft
with EMBT blow.*
Surface to 400 ft
but not to exceed
deepest depth
previously escorted
or valve cycling
accomplished.
Additional trials
and testing
permitted within the
Independent Ship
Exercise, crew rest
and other
requirements of this
instruction.
200 ft increments to
one half Maximum
Authorized
Operating Depth,
then 100 ft
increments to
Maximum
Authorized
Operating Depth.
200 ft. One half test depth. Maximum
Authorized
Operating Depth.
Rendezvous with
escort.
Escort Required Yes** No Yes**
Water Depth 400 ft per reference
(p)
Deep dive will be
terminated with an
EMBT blow from
Maximum
Authorized
Operating Depth
Appendix F section
2.
Unlimited. Reference (p).
* May be delayed to permit additional testing, commencing pre-transit valve operating cycling or transit
submerged. However, first surface after initial tightness dive must be by EMBT blow from 200 feet.
** An escort is required on the initial tightness dive and on subsequent first dive to any deeper depths, i.e.,
the first dive to any depth requires an escort. EMBT blow escort requirements given in paragraph
4.4.3.c of this chapter.