Logic Flow Charts
Logic flow charts have the event sequences as
determined by the logic circuits. The charts are, in
effect, pictures of the logic equations. They maybe used
along with the logic equations found in chapter 3 of the
S9234-series technical manuals.
Timing diagrams are for all significant timing
The diagrams show the exact timing
relationships and the origin of all significant timing
Interconnecting diagrams show the internal cabling
between the consoles and the electronic enclosures.
These diagrams identify the cabling and components by
Troubleshooting Functional Dependency
Troubleshooting fictional dependency diagrams
(TFDDs) show the fictional dependency of one circuit
upon another. The TFDDs are setup in pyramid fashion.
The vertical chains of boxes show contributing branches
of the signal development. They also show the
fictional dependency through successive levels. The
box at the top represents the function output of the
equipment and reflects the results of all of the boxes
Circuit Card Locator and Function
Circuit card locator and function information plates
(troubleshooting matrices) present the maintenance
information you need to isolate a specific circuit card
location. The matrix for troubleshooting is on the inside
of the door of each electronic cabinet assembly (ECA).
The matrix relates the ship functions to the
supporting circuit card within the ECA. The ship
function column lists the ship function controlled or
monitored. The qualifier column identifies the specific
function listed in the function column. The type column
identifies the function as a control, status, or alarm
function. The card location column contains the card
locations within the ECA. An X in the card location
column indicates that the circuit card is in that location
in the ECA card rack. The listings in the ship function
column relate to the identities of the discrete panel
readouts rather than the fictional groupings. The
troubleshooting matrix can be used in conjunction with
the demand display directories.
The tools and test equipment needed to properly
adjust, align, calibrate, and troubleshoot the ECSS
equipment are listed in volume 1, chapter 6, of all the
S9234-series technical manuals. This is a list of all test
gear, tools, and consumables needed. However, it
does not necessarily mean that all of them have to be
used on each piece of equipment. Equivalent tools and
test gear with superior measuring capabilities may be
substituted for the items shown by a double asterisk (**)
before the name.
THE ALLISON 501-K17 GTE
Maintenance and troubleshooting procedures for
the Allison 501-K17 GTE are similar to the procedures
used for the LM2500 engine. In all cases, you must use
the proper EOSS, PMS, and technical manuals when
conducting any maintenance or troubleshooting.
Volume 2 of the Model 104/Model 139 Gas Turbine
Generator Set technical manual is divided into two
parts. Part 1 contains all the necessary information,
procedures, and diagrams for locating a malfunction.
Part 2 contains the corrective maintenance procedures
for adjustment and alignment, repair, and removal/
replacement of components.
When entering and working within the engine
enclosure, follow the proper EOSS procedures and all
standard safety precautions at all times.
Gas turbine-powered ships are outfitted with all the
equipment necessary to remove and replace engine
As a senior petty officer, you will be
supervising component changeouts. As with any job,
you must plan and organize before starting the project.
Since most GTE problems occur while the ship is
underway, corrective maintenance must be performed
If you insist upon strictly following
step-by-step procedures as set forth in the technical
manual, you will save time by preventing errors. Do not
rely upon your memory for component changeouts.