Logic Flow ChartsLogic flow charts have the event sequences asdetermined by the logic circuits. The charts are, ineffect, pictures of the logic equations. They maybe usedalong with the logic equations found in chapter 3 of theS9234-series technical manuals.Timing DiagramsTiming diagrams are for all significant timingrelationships.The diagrams show the exact timingrelationships and the origin of all significant timingsignals.Interconnecting DiagramsInterconnecting diagrams show the internal cablingbetween the consoles and the electronic enclosures.These diagrams identify the cabling and components byreference designations.Troubleshooting Functional DependencyDiagramsTroubleshooting fictional dependency diagrams(TFDDs) show the fictional dependency of one circuitupon another. The TFDDs are setup in pyramid fashion.The vertical chains of boxes show contributing branchesof the signal development. They also show thefictional dependency through successive levels. Thebox at the top represents the function output of theequipment and reflects the results of all of the boxesbelow it.Circuit Card Locator and FunctionInformation PlatesCircuit card locator and function information plates(troubleshooting matrices) present the maintenanceinformation you need to isolate a specific circuit cardlocation. The matrix for troubleshooting is on the insideof the door of each electronic cabinet assembly (ECA).The matrix relates the ship functions to thesupporting circuit card within the ECA. The shipfunction column lists the ship function controlled ormonitored. The qualifier column identifies the specificfunction listed in the function column. The type columnidentifies the function as a control, status, or alarmfunction. The card location column contains the cardlocations within the ECA. An X in the card locationcolumn indicates that the circuit card is in that locationin the ECA card rack. The listings in the ship functioncolumn relate to the identities of the discrete panelreadouts rather than the fictional groupings. Thetroubleshooting matrix can be used in conjunction withthe demand display directories.TROUBLESHOOTING EQUIPMENTThe tools and test equipment needed to properlyadjust, align, calibrate, and troubleshoot the ECSSequipment are listed in volume 1, chapter 6, of all theS9234-series technical manuals. This is a list of all testgear, tools, and consumables needed. However, itdoes not necessarily mean that all of them have to beused on each piece of equipment. Equivalent tools andtest gear with superior measuring capabilities may besubstituted for the items shown by a double asterisk (**)before the name.THE ALLISON 501-K17 GTEMaintenance and troubleshooting procedures forthe Allison 501-K17 GTE are similar to the proceduresused for the LM2500 engine. In all cases, you must usethe proper EOSS, PMS, and technical manuals whenconducting any maintenance or troubleshooting.Volume 2 of the Model 104/Model 139 Gas TurbineGenerator Set technical manual is divided into twoparts. Part 1 contains all the necessary information,procedures, and diagrams for locating a malfunction.Part 2 contains the corrective maintenance proceduresfor adjustment and alignment, repair, and removal/replacement of components.When entering and working within the engineenclosure, follow the proper EOSS procedures and allstandard safety precautions at all times.COMPONENT CHANGEOUTGas turbine-powered ships are outfitted with all theequipment necessary to remove and replace enginecomponents.As a senior petty officer, you will besupervising component changeouts. As with any job,you must plan and organize before starting the project.Since most GTE problems occur while the ship isunderway, corrective maintenance must be performedimmediately.If you insist upon strictly followingstep-by-step procedures as set forth in the technicalmanual, you will save time by preventing errors. Do notrely upon your memory for component changeouts.2-28
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