Second helicopter operations to obstructed helidecks
Include in local helideck procedures and/or Operator’s Operations Manual procedures to be fol-lowed when landing a second helicopter on a helideck that is normally only approved for one heli-copter (first helicopter has a maintenance fault, etc.). Items to be considered include the following:
a) Determine if alternate means, vessel, etc. can fulfil requirements.
b) Operations must be daylight only and must be allowed by the Operator’s Operations

Manual. c) Use smaller helicopter, if possible to fulfil requirements. d) Minimum obstruction clearance during landing or take-off must not be less than the greater
of .rd rotor diameter or 4 meters. Any such obstructions must be located within the area swept by the 8 o’clock forward through to the 4 o’clock position of the landing helicopter as viewed from the flight deck.
e)  The helicopter Captain has the final decision on whether or not to land on the obstructed deck.
f)  Before any flight takes place, the Operator will request confirmation from the installation that the helideck is structurally capable of supporting the weights of both the incoming helicopter and the helicopter or other obstruction on the helideck.
g)  Helicopter Operator and offshore manager shall discuss risks involved in the operation and reach agreement that the operation may be conducted safely when the applicable risk miti-gation measures have been applied.

Operational hazard considerations
A number of hazards can exist at offshore facilities and the local helideck procedures manual or the Operator’s Operations Manual should have written operational procedures for closing helidecks and have hazard warning systems for the hazards noted below. OGP Member Aviation Advisors can provide sample procedures if desired.
a)  Crane – helicopter operational procedures.
b) Helicopter/tanker operation.
c) Helideck/heliport operational hazard warning(s)/procedure(s).
d) Perforating operations.
e) Gas venting.
f) Hydrogen sulphide gas (if applicable for the area).

Helideck Local Procedures Manual
OGP Members’ operations with helidecks should have, for pilot use, a Local Procedures Manual detailing operational procedures, hazards, etc. for each helideck. These Manuals should include as a minimum the following: overhead and side views of the helideck, size/weight capability, markings, lighting (if installed), communications, weather capabilities, obstacles, turbulence issues, hazards, and any specific operational procedures. These often take the form of “approach” plates and, lacking other references, JAR Ops 3.220 with AMC 2 can be used.

HLO & HDA standards
UK Offshore Operators Association (UKOOA) publication “Guidelines for the Management of Offshore Helideck Operations” is a good source when considering requirements for management and operation of helidecks. This includes manning, competence and training of helideck personnel. Further guidance is available in the following documents:
a) UK CAA Publication - CAP 437 b) Offshore Petroleum Industry Training Organisation (OPITO) Training Manuals and Courses c) Helicopter Safety Advisory Conference - Recommended Practice.

11.9.4 Heliports
Design reference
ICAO Annex 14, Volume II, Heliports, should be used in all design considerations, construction or major rework of existing heliports, where no other local guidance exists.

Rejected takeoff area
a)  All heliports should have a rejected takeoff area or “Flyway” to allow for helicopter landing in the event of an aborted takeoff or return due to malfunction.
b)  The length of a flyway will vary by model helicopter, its gross takeoff weight, and the pre-vailing density altitude. These performance parameters are published in the applicable heli-copter flight manual.
　
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