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Presentation Presentation ObjectivesObjectives
To acquire a general knowledge of the responsibilities of the Auxiliary on how discrepancies and verification checks are performed.
To become familiar with the three categories of AtoN discrepancies.
To learn how to recognize a discrepancy on an aid to navigation.
Definition of CriticalDefinition of Critical
This term is used for those
discrepancies where failure
to report by the most
expeditious means may
result in loss of life or
damage to a vessel.
Critical DiscrepanciesCritical Discrepanciesa. Aid totally covered or
shrouded in ice.
b. Light signal showing improper characteristics or rhythm.
c. Light signal obscured or extinguished.
d. Sinking or submerged buoy.
e. Buoy off station, adrift, missing, capsized or stranded.
f. Vandalism of aids.
g. Aids damaged by vessel collision.
h. Collapsed bridge structures.
i. RAdar beaCON not operating.
j. Lantern damaged
Definition of UrgentDefinition of UrgentThis term is used forthose discrepancieswhere failure to reportwill result in no danger of loss of life or vesseldamage, but maycontribute to a groundingor a stranding.
Urgent DiscrepanciesUrgent Discrepanciesa. Daymark(s) missing
or damaged by causes other than vandalism.
b. Sound signal failure.Bell, Gong, Horn, etc.
c. Light burning dim or showing reduced intensity.
d. Lights partly or totally obscured by dayboards.
e. Bridge light outages.
f. Inoperative draw on swing, lift or retractable bridges.
Definition of RoutineDefinition of Routine
Term is used for those
discrepancies where failure to
report will result in very low
likelihood of grounding or
stranding, but corrective
maintenance is necessary.
Routine DiscrepanciesRoutine Discrepancies
a. Aid obscured by foliage or other objects that should be removed.
b. Faded daymarks, whether located on aids in the water or on the shore.
c. Extensive bird fowling on aid.
d. Delaminating of Dayboards.
e. Dayboard missing.
f. Improper dayboards per Light List.
g. Extensive deterioration or rotting of supports.
h. Leaning structure—more than 15 degrees.
And there’s more. . .
Routine DiscrepanciesRoutine Discrepancies
i. Missing vent valve.
j. Bird nest on aid that is obstructing light or panels
k. Retroreflective material is peeling, missing or inadequate.
l. Numbers are obliterated or not easily read or identified.
m.Peeling paint interfering with the ability to see the aid or recognize its proper color.
n. Whistle, tapper, or bell missing.
Check after storms.
Panels are designed to break away so that high
winds or waves will
not take out the pile.
Inspection and Maintenance Dayboard surface and backing
materials will deteriorate due to the effects of weathering by: wind, rain, freezing temperatures, and sunlight.
Backing Material Delamination should not have
progressed over more than 25 percent of the backing material.
Material should not be sufficiently warped to visibly detract from the signal.
Mounting points should not be softened or deteriorated to the degree that the board may come loose during a storm.
Films, Numbers, Letters, & Borders
Delamination of the film should not progress over 10% of the surface area.
Material should not be cracked, checked or abraded so as to provide a dull or roughened top surface.
Material attached should not have peeled over more than 10% of the surface area.
Fading There is no practical way to measure
fading.
Replacement is based on the judgment of servicing personnel.
It must display the intended signal until the next scheduled service.