Babcock International Group PLC (LON:BAB) said it would spend £10mln a year on restructuring its aerial emergency services businesses in Europe for Brexit.
The aerospace and defence company will also take a one-off tax cost of £10mln this year to ensure the businesses meet European operating requirements.
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The restructuring is to guarantee the company retains flying rights to provide emergency medical and fire fighting services across the European Union even if the UK leaves the bloc without a trade deal.
Babcock joins airlines such as easyJet PLC (LON:EZY) and British Airways-owner International Consolidated Airlines PLC (LON:IAG) in preparing for the event of a no-deal Brexit.
The group has signed partners in European markets where it operates to make sure those businesses are majority owned by EU nationals, allowing it to secure an air operating certificate.
Babcock also announced an exceptional charge of £30mln due to an adjustment to its pension liabilities.
Full-year earnings guidance maintained
The company said its expectations for underlying earnings for the year ending March 31 remain unchanged. An improved margin will offset a dip in estimated revenue to £5.2bn from £5.35bn last year.
Revenue dropped because Babcock is nearing the end of several major contracts such as building the HMS Queen Elizabeth aircraft carrier (QEC), and its South African business has been struck by delayed power station outages.
Revenue was also dragged lower by disposals and exits from small non-core businesses.
"We continue to make good operational and strategic progress and won some great new contracts in the period including an expansion into the aerial emergency services market in North America, a significant win in Australia and securing the next ten years for our rail business," said chief executive Archie Bethel.
"Whilst preparing for the UK exiting the EU and for our QEC and Magnox contracts coming to an end, we continue to grow our business across our three key markets of defence, aerial emergency services and nuclear."
In morning trading, shares fell 3.3% to 557.2p.