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out on approach. Ensure all communications are
complete outside the 1,000 foot hazard distance. If no
response is received, or if the platform is not radio
equipped, further radio transmissions should not be
made until visual contact with the deck indicates it is
open for operation (no white “X”).
g. Hydrogen Sulfide Gas Helideck/Heliport
Operational Hazard Warning(s)/Procedures
1. Background. Hydrogen sulfide (H2S) gas:
Hydrogen sulfide gas in higher concentrations
(300−500 ppm) can cause loss of consciousness
within a few seconds and presents a hazard to pilots
on/near offshore helidecks. When operating in
offshore areas that have been identified to have
concentrations of hydrogen sulfide gas, the following
practices are recommended.
2. Recommended Practices
(a) Pilots
(1) Ensure approved protective air packs
are available for emergency use by the crew on the
helicopter.
(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 10−2−1
Closed Helideck Marking − No Radio
AIM 2/19/04
10−2−4 Special Operations
(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 150/5390−2A, “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 − 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
Advisory Circular AC 150/5390−2A, 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.
(c) Wind socks or indicator should be clearly
visible to provide upward indication for the pilot.
i. Helideck/Heliport Operational Warning(s)/
Procedure(s) − Closed Helidecks or Heliports
1. Background. A white “X” marked diagonally
from corner to corner across a helideck or
heliport touchdown area is the universally accepted
visual indicator that the landing area is closed for
safety of other reasons and that helicopter operations
are not permitted. The following practices are
recommended.
(a) Permanent Closing. If a helideck or
heliport is to be permanently closed, X diagonals of
　
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