The term ‘reasonably foreseeable’ is used in the ACOP. This would include, for example, a catastrophic failure, a ship collision, a helicopter ditching near the installation, and a person falling from the installation during overside working. It would not, for example, include such things as a jumbo jet crashing into the installation.
Source: Prevention of Fire and Explosion, and Emergency Response on Offshore Installations, Offshore Installations (Prevention of Fire and Explosion, and Emergency Response) Regulations 1995, Approved Code of Practice and guidance (UK HSE L65), Second Edition, 1997. Regulatory Guidance