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11.8 Non-directional beacons (NDB)
NDBs should have a periodic maintenance programme, which includes annual calibration for proper output based on the specific Manufacturer’s published procedures.
All NDBs, whether onshore or offshore, should have aeronautical navigation frequencies that have been provided by the specific country of operations CAA or authorized communications agency. Frequencies provided from other sources are not recommended for air navigation purposes.
11.9 Helicopters & helidecks
11.9.1 General
ICAO Annex 14, Volume II, titled “Heliports” should be used in all design considerations, con-struction or major rework of existing heliports or offshore helidecks, if no local regulatory guidance exists.
11.9.2 Size – definition
As a minimum any heliport or helideck should be sufficient in size to accommodate the largest heli-copter using the helideck or heliport for single helicopter operations.
The ‘D’ value, where ‘D’ is the largest overall dimension of the helicopter with the rotors turning, will define the maximum size of helicopter able to use the helideck.
The “D” dimension will normally be measured from the most forward position of the tip path plane of the main rotor to the most rearward position of the tip path plane of the tail rotor.
11.9.3 Helidecks
Design references
1) All new helidecks should conform to the standards of ICAO “Aerodromes” Annex 14, Vol II, if no local regulatory guidance exists, and should be designed to accommodate the larg-est helicopter anticipated for use during the life of the structure. For practical implementa-tion guidelines and practices CAP 437, “Offshore Helicopter Landing Areas” and the ICAO Heliport Manual should be used.
2) Criteria for mobile offshore drilling unit (MODU) helidecks are contained in the International Maritime Organization’s (IMO) Code for the Construction and Equipment of Mobile Offshore Drilling Units. These criteria may be applied to other mobile offshore units.
3) Shipboard helidecks such as tankers and seismic vessels should conform to the International Chamber of Shipping’s (ICS) “Guide to Helicopter/Ship Operations.”
Size
1) For all new-build helidecks
a) New build helidecks shall conform to the minimum size recommended in ICAO Annex 14, unless the local guidance provides for variances.
1) Helidecks mounted on the bow of FPSOs may require larger than normal diameters, up to 1.5 D (D = overall length of the helicopter with rotors turning), due to pitch, roll, and heave considerations. Advice from the OGP Member’s Aviation Advisor should be sought before completing design on FPSO helidecks.
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:
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飞机管理指导方针 Aircraft management guidelines(61)
