JOINT FLEET MAINTENANCE MANUAL

COMFLTFORCOMINST 4790.3 REV A
(4) Assume maintenance responsibility upon receipt. (PMS installation should be scheduled to
support OCT).
NOTE: IN SOME INSTANCES SYSTEMS MAY BE TURNED OVER THAT REQUIRE TEMPORARY
SUPPORT SYSTEMS. THE INDUSTRIAL ACTIVITY WILL PROVIDE OPERATING
INSTRUCTIONS, DRAWINGS (AS NECESSARY) AND OPERATING INDOCTRINATION
TO SHIP'S FORCE. FOLLOWING THE REMOVAL OF TEMPORARY SUPPORT
SYSTEMS, SHIP'S FORCE AND THE SHIPBUILDER SHOULD BE PREPARED TO
CONDUCT ADDITIONAL WALK-THROUGHS.
3.7.1 Sound Silencing Programs Unique to New Construction (MHC/SSN only).
a. Isolation System Survey. During the construction process, the shipbuilder, through Noise Reduction
Program requirements, periodically inspects the ship to identify incorrect installation and poor
construction techniques relating to the silencing nature of the ship. It is imperative that no sound shorts
exist between sound isolated systems/components and the hull structure. Ship's Force can play a major
role in the inspection process by identifying deficiencies. This survey is the basis for acoustic
measurements to be completed in subsequent surveys. Additional information concerning submarine
noise reduction surveys is addressed in Volume VI, Chapter 23 of this manual.
b. (Submarines only) Topside and Housekeeping Survey. During the construction process, this survey is
completed to accomplish two aspects of silencing. First, the topside inspection checks the outside of
the pressure hull, especially flow exposed areas, to ensure that tones or rattles are not caused by loose
gear, fairing plates, and other discontinuities. Secondly, the housekeeping inspection checks the inside
of the pressure hull to ensure sound shorts do not occur as a result of installation of lockers and locker
doors, stowage, clogged ventilation ducts or filters, etc. This survey usually identifies problems
associated with items not covered by ship design, but those items typically handled by the ship.
c. Structureborne and Overside Surveys. Upon installation of Noise Critical components and their
associated operating systems, structureborne noise surveys are accomplished to check the acoustic
nature of the installation. Proper installation of isolation features and proper maintenance of the
component during any lay up is crucial to the success of this survey. Ship's Force must continually be
aware of the installation practices of the shipbuilder and thoroughly inspect the installation for sound
shorts and proper alignment prior to system/component turnover. The Overside Survey is accomplished
outside the hull (pressure hull for submarines) as an indication of radiated noise. Proper operation of
systems and components during this process is crucial to satisfactory acoustic levels. Reference (ad)
provides additional information concerning acoustic surveys for submarines.
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