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1.9 (unspecified cause).
1.5.1.2These and other operational hazards are
currently minimized through timely dissemination of
a written Notice to Airmen (NOTAM) for pilots by
helicopter companies and operators. A NOTAM
provides a written description of the hazard, time and
duration of occurrence, and other pertinent information.
ANY POTENTIAL HAZARD should be
communicated to helicopter operators or company
aviation departments as early as possible to allow the
NOTAM to be activated.
1.5.1.3To supplement the existing NOTAM procedure
and further assist in reducing these hazards, a
standardized visual signal(s) on the helideck/heliport
will provide a positive indication to an approaching
helicopter of the status of the landing area.
Recommended Practice(s) have been developed to
reinforce the NOTAM procedures and standardize
visual signals.
AIP ENR 6.2−3
United States of America 15 MAR 07
Federal Aviation Administration Nineteenth Edition
1.6Drilling Rig Perforating Operations:
Helideck/Heliport Operational Hazard
Warning(s)/Procedure(s)
1.6.1Background.A critical step in the oil well
completion process is perforation, which involves the
use of explosive charges in the drill pipe to open the
pipe to oil or gas deposits. Explosive charges used in
conjunction with perforation operations offshore can
potentially be prematurely detonated by radio
transmissions, including those from helicopters. The
following practices are recommended.
1.6.2Recommended Practices
1.6.2.1Personnel Conducting Perforating
Operations.Whenever perforating operations are
scheduled and operators are concerned that radio
transmissions from helicopters in the vicinity may
jeopardize the operation, personnel conducting
perforating operations should take the following
precautionary measures:
a)Notify company aviation departments, helicopter
operators or bases, and nearby manned platforms
of the pending perforation operation so the Notice to
Airmen (NOTAM) system can be activated for the
perforation operation and the temporary helideck
closure.
b)Close the deck and make the radio warning
clearly visible to passing pilots, install a temporary
marking (described in subparagraph1.9.1.2 with the
words NO RADIO" stenciled in red on the legs of
the diagonals. The letters should be 24 inches high
and 12 inches wide. (See FIG ENR 6.2−1.)
c)The marker should be installed during the time
that charges may be affected by radio transmissions.
1.6.2.2Pilots
a)Pilots when operating within 1,000 feet of a
known perforation operation or observing the white
X with red NO RADIO" warning indicating
perforation operations are underway will avoid radio
transmissions from or near the helideck (within
1,000feet) and will not land on the deck if the X is
present. In addition to communications radios, radio
transmissions are also emitted by aircraft radar,
transponders, radar altimeters, and DME equipment,
and ELTs.
b)Whenever possible, make radio calls to the
platform being approached or to the Flight Following
Communications Center at least one mile 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").
FIG ENR 6.2−1
Closed Helideck Marking − No Radio
ENR 6.2−4 AIP
15 MAR 07 United States of America
Nineteenth Edition Federal Aviation Administration
1.7Hydrogen Sulfide Gas Helideck/Heliport
Operational Hazard Warning(s)/Procedures
1.7.1Background.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.
1.7.2Recommended Practices
1.7.2.1Pilots
a)Ensure approved protective air packs are
available for emergency use by the crew on the
helicopter.
b)If shutdown on a helideck, request the
supervisor in charge provide a briefing on location of
protective equipment and safety procedures.
c)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
　
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