2.
Combined operations (e.g. involving closely positioned workover rigs or flotels) where the effects of windflow, exhausts and proximity on helicopter operations have not been considered. There may be conflict between flights to adjacent installations, however, bridge linked units can make a choice of helideck available.
3.
Lack of awareness on the part of the OIM of the impact of routine platform activities on helicopter operations can also be important. Gas turbine exhaust plumes are largely invisible to a helicopter pilot but can be detrimental to helicopter handling and performance. Information on the operational status of such equipment should be made available to pilots.
4.
Releases of hydrocarbon gas, whether due to an unforeseen accident, or as part of a controlled blowdown of process equipment, also represent a hazard to helicopters. Where a condition can exist which may be hazardous to the helicopter or the occupants, duty holders should install helideck status lights.
5.
Diesel exhaust emissions can also cause serious degradation to the quality of the flying environment. This is particularly so in respect of the fumes and airborne particulates associated with diesel exhausts. The thermal effects from diesel exhaust emissions on helicopter rotor, engine control and performance are generally less than from gas turbine exhausts operating at higher temperatures.
The sample strategy, outlined in Section 5.3, is provided to maximise coverage of the helideck assessment.
5.3 HELIDECK ASSESSMENT STRATEGY
When preparing risk and operability assessments the duty holder should particularly address the following issues by preparing a schedule of key factors likely to have an impact on the safety of helicopter operations. The schedule should include, but is not necessarily limited to:
.
The maintenance of unobstructed air flow over and under the helideck
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Consideration of the likely impact on the airflow situation due to changes in the topside layout that could range for example from temporary storage under the helideck to more permanent changes such as the addition of cladding to the drilling derrick
.
The operation of gas turbine units in situations where hot exhaust gasses may be emitted into the path of a helicopter
.
Flaring and blowdown of flammable gas which may be prejudicial to helicopter operations
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