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JOINT FLEET MAINTENANCE MANUAL

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COMFLTFORCOMINST 4790.3 REV A<br />

(5) Specific written approval by the TYCOM is not required to operate outside the upper limits of<br />

the SOE, i.e., shallow and fast, while conducting the following operations during Sea Trials or<br />

tests in accordance with an agenda approved by the ISIC, Ship Program Manager or higher<br />

authority:<br />

(a) Conducting full power runs or cavitation curves.<br />

(b) Ship Program Manager sponsored acoustic trials in accordance with an approved<br />

acoustic trial agenda.<br />

(6) The first underway will be limited in scope. The initial tightness dive will be a deliberate,<br />

planned, step-by-step evolution as defined in Appendix D of this chapter, using conservative<br />

angles and moderate speed. The maximum water depth for this dive shall be 400 feet, as<br />

prescribed by Appendix D of this chapter.<br />

c. Escort.<br />

(1) The submarine shall be accompanied by an escort properly equipped with sonar<br />

communication equipment. The escort ship must have the capabilities identified in Appendix<br />

E of this chapter. Specifically an escort is required for:<br />

NOTE: FOR ALPHA SEA TRIAL, A BACK-UP ESCORT WILL BE ASSIGNED AND READY IN<br />

CASE OF FAILURE OF THE PRIMARY ESCORT.<br />

(a) Initial tightness dive after construction and the first dive to any deeper depth.<br />

(b) Initial deep dive after construction.<br />

(c) Emergency Main Ballast Tank (EMBT) blow test under the following conditions:<br />

• Blow for first time from each depth. Trial agenda will specify depths.<br />

• Any blow from greater than 400 feet. Rationale is to give submarine added protection<br />

to prevent interference from any surface contact.<br />

NOTE: IN ALL CASES, HULL STRENGTH/TIGHTNESS AND VALVE OPERATIONS WILL HAVE<br />

BEEN TESTED TO A DEPTH EQUAL TO OR GREATER THAN EMBT BLOW DEPTH<br />

BEFORE TESTING EMBT BLOW SYSTEM.<br />

(d) The second and subsequent underway periods if major hull and system work has been<br />

accomplished since the last Sea Trial.<br />

(2) Alternate Escort. If a surface ship meeting the requirements of Appendix E of this chapter is<br />

not available, then a submarine with the required capabilities will be assigned. In any event,<br />

each situation must be examined on a case basis and approval by the TYCOM must be<br />

obtained to conduct the initial tightness or test depth dives.<br />

I-4-6

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