All Robinson helicopters in the Philippines have been grounded by the Civil Aviation Authority of the Philippines (CAAP). The action follows a recent fatal accident that killed four (or five, depending on which account you believe).
The fleet (which means about 50 helicopters) has been grounded while the accident is investigated. If that happened in the US or the UK I would assume that the NTSB or CAA had discovered something serious that put the rest of the fleet at risk. The accident that lead to the grounding killed Rafael Nantes, a local Governor.