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Session VIII Discrepancy. 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 .

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Presentation Transcript
presentation objectives
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.

Presentation Objectives
definition 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.

Definition of Critical

CRITICAL

critical discrepancies
a. 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

Critical Discrepancies

CRITICAL

definition of urgent
This term is used for

those discrepancies

where failure to report

will result in no danger of

loss of life or vessel

damage, but may

contribute to a grounding

or a stranding.

Definition of Urgent

URGENT

urgent discrepancies
a. 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.

Urgent Discrepancies

URGENT

definition 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.

Definition of Routine

ROUTINE

routine 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 Discrepancies

ROUTINE

routine discrepancies1
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.

Routine Discrepancies

ROUTINE

operational requirements
Contrast

Vegetation

Background

lights

Operational Requirements
inspection and maintenance
Dayboard surface and backing materials will deteriorate due to the effects of weathering by:

wind,

rain,

freezing temperatures, and

sunlight.

Inspectionand Maintenance
backing material
Delaminationshould not have progressed over more than 25 percent of the backing material.

Material should not be sufficiently warpedto 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.

Backing Material
films numbers letters borders
Delaminationof the film should not progress over10%of the surface area.

Material shouldnotbecracked, checkedor abraded so as to provide a dull or roughened top surface.

Material attached shouldnot havepeeled over more than10%of the surface area.

Films, Numbers, Letters, & Borders
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.

Fading
more fading
. . . more FADING

NEW

FADED

REPLACE

more fading1
. . . more FADING

REPLACE

NEW

FADED

slide25

END OF

SESSION VIII