• It should provide assurance that the residual safety risks associated with the operation of the GBAS continue to be managed to acceptable level.
• It should ensure that lessons learnt from the initial operating period are captured.
• It should be able to identify any issues experienced and remedial action to address those issues.
• It should ensure that any outstanding tasks for activities within the Safety Case have been appropriately addressed.
• It should validate that assumptions are still applicable.

The Post Implementation Review should involve the review of:

• Service Requirements and whether the GBAS has met those Service Requirements.
• Operational practices for the GBAS.
• Implementation process and areas for improvement.
• Hazards associated with the operation of the GBAS and whether existing risk assessments remain valid.
• Any occurences or system related issues.
• Any safety related issues.
• Whether the safety benefits envisaged from the implementation of the GBAS have been met.