TORONTO -- A helicopter manufacturer has missed its deadline for the delivery of first batch of military helicopters to replace the aging Sea Kings.

Sikorsky International Operations was supposed to deliver 28 of the CH-148 Cyclones in June.

The Globe and Mail reports that Public Works and Government Services Canada, which is handling the order, confirmed the company did not have the helicopters ready.

The new helicopters are to replace the nearly half-century old Sea Kings, which have been plagued by technical problems, leading to crashes and regular groundings.

Sikorsky was supposed to begin delivering the replacement choppers in 2008, but that deadline was extended to last month.

Ottawa has been trying to replace the Sea Kings since the 1980's.