[. If a take off or landing profile is 'certified' (accepted by the authorities as Cat A compliant) then it cannot by definition conflict with a mandatory (listed in the 'Limitations' section of the RFM) HV envelope.
2. My AW 139 has a Vertical Helipad profile with optional TDPs between 35 and 70 feet and a Short Field Take Off (vertical ascent to TDP) with TDPs between 85 and 400 feet ATS, published as Cat A compliant.
3. These profiles are clearly in conflict with the HV envelope.
4. The size of the HV envelope is variable according to WAT inputs but the TDP options are not WAT-dependent.
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Geoff
I wonder how you can make statements like these. A Cat A profile, by definition and by certification rules, can never interfere with the H-V area because if this would happen, the fundamental requirement of a safe landing, could not be achieved.
Since you have to demonstrate that at any point of the take off profile before TDP you can safely land after engile failure or you can carry out a Continued Take Off after an engine failure at or after TDP, there is no way H-V can interfere with Cat A.
The AW139 Cat A profiles (6 different techniques) have been certified and are compliant with these rules.
I strongly reccomend you to carefully study RFM Supllement, this will avoid to rush to not correct conclusions.