May 23 (Reuters) - About 3,000 striking workers at RTX's

Pratt & Whitney are slated to vote on a contract offer

from the engine maker next week, the company and the union

representing the workers announced on Friday, one day after

negotiations resumed.

The nearly three-week-long strike has significantly slowed

production at two of the company's plants in Connecticut.

Union representatives have said the workers' top priority is

getting Pratt to commit to keep work for Lockheed Martin's ( LMT )

F-35 fighters in the state. Members of the International

Association of Machinists and Aerospace Workers overwhelmingly

rejected the first contract offer on May 4.

"On Tuesday, our members will decide if we achieved our

objectives around job security, wage security, and retirement

security," IAM leaders said in a message sent Friday to members.

"This new proposal has significant changes/improvements in all

three of these core areas."

A Pratt spokesperson declined to comment on the specifics of

the offer.

The strike is the first in more than 20 years at the

enginemaker's Connecticut sites, where it produces engines for

the F-35 and about 70% of the company's geared turbofan engine,

which is used in European planemaker Airbus'

strong-selling A320 neo family.

Pratt has reassigned some engineers to production lines as

part of its contingency plan, which was first reported by

Reuters.