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This paper describes a method for performing safety analysis on an Integrated Modular Avionics system in a manner which supports the incremental development and change of system components. This is achieved by analysing each component in the context of the overall system design and then finding derived safety requirements. Each IMA component (hardware, software or both) is then examined to determine how these safety requirements are met, and a contract is formed which captures the rely/guarantee conditions between that component and any component which relies on it. This contract captures the behaviour which must be preserved by a component following incremental change.