In short, he or she can’t ! Section 9 gives no authority for the Project Manager to do this.
So off the top of my head you have these options :
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Clause 26.1 makes it clear that the main contract applies whether the Contractor subcontracts the work or not, so if the breach is ‘substantial’ enough at main contract level you could terminate at main contract level (but make sure it is substantial).
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With back-to-back provisions under the full subcontract (ECS) conditions and similar provisions under the short subcontract (ECSC), what is a minor default at main contract level may be a major default at subcontract level. You could encourage the main Contractor to take up this option.
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You could take out the subcontractor’s remaining scope from the Works Information, which would be a negative compensation event. If the main contract was under options A or B, this should strictly be assessed using the Shorter Schedule of Cost Components, although by agreement it could rates and lumps could be used (see clause 63.13/14). If the main contract was options C, D or E, it would be assessed as per that subcontract - which would probably be by the main Contractor terminating the subcontract due to the default of the Subcontractor.