Staff at Airservices Australia will soon vote on industrial action.

Frustrations are close to boiling over at the air navigation agency amid a push from bosses to cut conditions.

Professionals Australia, the union for engineers and scientists at the 3700-strong agency, says a protected action ballot will be held soon.

The union says Airservices wants to cut its internal Employee Grievance Board which would force staff to take disputes directly to the Fair Work Commission.

Additionally, there is concern that agency-funded, work-related study could also disappear under the new pay deal.

“For our members, performing highly technical and professional roles which require periodic and often expensive study and training, this change will directly impact upon how they perform their jobs,” Professionals Australia ACT organiser Brendan Forde has told Fairfax.

“Our members are open to considering changes to the enterprise agreement that improve the effectiveness and efficiency of Airservices. But the changes won’t achieve this.”

Airservices Australia says it wants a simplified enterprise agreement that is in line with the federal government’s tough workplace bargaining policy.

“We have been negotiating in good faith since August 2017 and our aim is to have a new agreement in place as soon as possible,” the agency said.

The Community and Public Sector Union (CPSU) is sending ballots to its members at the agency.

It says the Coalition government's bargaining policy is part of the impasse at the negotiation table.

“No worker in Airservices needs to be reminded that it has been nearly 12 months since you and your colleagues received a pay rise,” the union said.

“Airservices’ delaying tactics are unacceptable and cannot continue without consequence. The majority of CPSU members believe it is time to increase pressure on the government and Airservices to deliver an agreement which maintains your conditions, rights, entitlements and includes a fair pay increase.”

Airservices recently settled on agreements with air traffic controllers and aviation fire fighters, and Mr Forde says other workers are looking for similar deals.

“Our members simply want to be treated the same. All they want is a fair and reasonable enterprise agreement,” he said.