JOINT FLEET MAINTENANCE MANUAL

TERM DEFINITION
APPENDIX D
GLOSSARY OF TERMS
COMFLTFORCOMINST 4790.3 REV A
Alpha Trial Builder's Propulsion Trial; Acceptance Trial for SSN Propulsion Plant; Initial
Tightness Dive (SSN); Dive to Maximum Authorized Depth (Selected SSN
platforms).
Acceptance Trials (AT) Trials and material inspections conducted underway by the INSURV Board for ships
constructed in a private industrial activity to determine suitability for acceptance of a
ship by the Navy.
Accepting Authority The officer designated by the Chief of Naval Operations (CNO) to accept a vessel
for the Navy, normally NAVSEA.
Bravo Trial Normally the initial Dive to Test Depth; Noise Trial (SSN); Weapons testing
(Surface Combatants).
Builder's Trials (BT) Evaluation trials and inspections conducted underway by the builder to assure the
builder and the Navy that the ship is, or will be, ready for Acceptance Trials. These
trials should be a comprehensive test of all ship's equipment and be similar in scope
to Acceptance Trials. For nuclear powered surface ships this is the Acceptance Trial
for the Nuclear Propulsion plant.
Charlie Trial Combat Systems and retesting (SSN); Acceptance Trials (DDG).
Combined Trials (CT) Combined Trials are a combination of an Acceptance Trial with a Final Contract
Trial. The INSURV Board normally conducts Combined Trials for nuclear powered
submarines.
Deep Dive The first dive to maximum operating depth. This depth will not necessarily coincide
with the design test depth of the hull. See definition of Maximum Operating Depth.
Delivery The date the Navy accepts the ship from the shipbuilder. This requires a
recommendation from the INSURV Board to accept/deliver the ship. Delivery of
the ship is based on Acceptance Trials and satisfactory correction or resolution of
deficiencies.
Dock Trial Dock Trials are those ship trials conducted at the Industrial Activity to determine the
ability of the ship, from a material standpoint, to conduct Sea Trials safely.
Fast Cruise A period immediately prior to underway trials during which Ship's Force operates
the ship for dockside training. Fast Cruise shall, as far as is practical, simulate at-sea
operating conditions.
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