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1.5.1 Background
1.5.1.1 A number of operational hazards can develop on or near offshore helidecks or onshore heliports that can be minimized through procedures for proper notification or visual warning to pilots. Examples of hazards include but are not limited to:
 a) Perforating operations: subparagraph 1.6.
 b) H2S gas presence: subparagraph 1.7.
 c) Gas venting: subparagraph 1.8; or,
 d) Closed helidecks or heliports: subpara-graph 1.9 (unspecified cause).
1.5.1.2 These 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 informa-tion. ANY POTENTIAL HAZARD should be communicated to helicopter operators or company aviation departments as early as possible to allow the NOTAM to be activated.
1.5.1.3 To supplement the existing NOTAM proce-dure 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.

1.6 Drilling Rig Perforating Operations: Heli-deck/Heliport Operational Hazard Warn-ing(s)/Procedure(s)
1.6.1 Background. 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.
1.6.2 Recommended Practices
1.6.2.1 Personnel Conducting Perforating Op-erations. 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, helicop-ter 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 subparagraph 1.9.1.2 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.
1.6.2.2 Pilots
 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 1,000 feet) 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

Federal Aviation Administration Twentieth Edition
1.7 Hydrogen Sulfide Gas Helideck/Heliport Operational Hazard Warning(s)/Procedures
1.7.1 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.
1.7.2 Recommended Practices
1.7.2.1 Pilots
 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 protective air pack, exit to an area upwind, and notify the suspected source field of the hazard.
　
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