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(2)

If shutdown on a helideck, request the supervisor in charge provide a
briefing on location of

protective equipment and safety procedures.

(3)

If while flying near a helideck and the visual red beacon alarm is
observed or an unusually strong

odor of "rotten eggs" is detected, immediately don the protective air
pack, exit to an area upwind, and notify the

suspected source field of the hazard.

FIG 10

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Closed Helideck Marking

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 No Radio

(b)  Oil Field Supervisors

(1)

If presence of hydrogen sulfide is detected, a red rotating beacon or
red high intensity strobe light

adjacent to the primary helideck stairwell or wind indicator on the
structure should be turned on to provide visual

warning of hazard. If the beacon is to be located near the stairwell,
the State of Louisiana "Offshore Heliport

Design Guide" and FAA Advisory Circular (AC) 150/5390

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2A, Heliport Design Guide, should be reviewed to

ensure proper clearance on the helideck.

(2)

Notify nearby helicopter operators and bases of the hazard and advise
when hazard is cleared.

(3)

Provide a safety briefing to include location of protective equipment
to all arriving personnel.

(4)

Wind socks or indicator should be clearly visible to provide upwind
indication for the pilot.

h.  Gas Venting Helideck/Heliport Operational Hazard
Warning(s)/Procedures

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 Operations Near Gas

Vent Booms

1.  Background.

Ignited flare booms can release a large volume of natural gas and
create a hot fire and

intense heat with little time for the pilot to react. Likewise,
unignited gas vents can release reasonably large

volumes of methane gas under certain conditions. Thus, operations
conducted very near unignited gas vents

require precautions to prevent inadvertent ingestion of combustible
gases by the helicopter engine(s). The

following practices are recommended.

2.  Pilots

(a)

Gas will drift upwards and downwind of the vent. Plan the approach and
takeoff to observe and avoid

the area downwind of the vent, remaining as far away as practicable
from the open end of the vent boom.

(b)

Do not attempt to start or land on an offshore helideck when the deck
is downwind of a gas vent unless

properly trained personnel verify conditions are safe.

3.  Oil Field Supervisors

(a)

During venting of large amounts of unignited raw gas, a red rotating
beacon or red high intensity

strobe light adjacent to the primary helideck stairwell or wind
indicator should be turned on to provide visible

warning of hazard. If the beacon is to be located near the stairwell,
the State of Louisiana "Offshore Heliport

Design Guide" and FAA AC 150/5390

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2A, Heliport Design Guide, should be reviewed to ensure proper

clearance from the helideck.

(b)

Notify nearby helicopter operators and bases of the hazard for planned
operations.

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Special Operations