The police service uses the same model Eurocopter EC-135 which was involved in the Glasgow air crash last month.
The grounding came as it was announced on Thursday that a tenth person had died in hospital after a police helicopter crashed into the Clutha bar in beside the River Clyde in the city.
Joe Cusker, 59, died at Glasgow Royal Infirmary almost two weeks after the tragedy.
An initial report from the Air Accident Investigation Branch said it had found "no evidence of major mechanical disruption" on the helicopter.
Bond Air Services, which operates 22 UK air ambulance and police helicopters, on Thursday, announced it was grounding its 22 services after a fault was discovered during a flight on Wednesday.
The company said that it was doing so as a "precautionary measure" while a diagnosis of the problem was carried out.
The aircraft's manufacturer, Eurocopter, said it was not telling other operators of the EC-135 to ground their helicopters.
The PSNI has three helicopters, one of which is a Eurocopter EC-135 and told UTV it has not grounded its aircraft and it continues to operate as normal.