The company is underway with work to replace the bridge's truss end links at the North East main span. A fracture in the structure caused the bridge to be closed to all traffic in December last year.
While temporary brackets were installed in February to provide extra support, the truss end links are being replaced with a new permanent sliding bearing arrangement which will be fixed to the tower beneath the existing end post.
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Amey said structural health monitoring which was installed during initial repairs will continue to be developed to provide engineers with ongoing live data.
The company added a small number of overnight contraflows will be required to allow the replacement work below deck level to proceed.
Mark Arndt, Operating Company Representative for the Forth Bridges Unit, said: "We're delighted to be commencing work on the full replacement of the truss end links with a completely new redesigned arrangement.
"The repairs carried out last winter were necessary to get the bridge back open to traffic as quickly and safely as possible. Since then we've been planning and preparing for this permanent replacement and it's remarkable that the team has reached this point less than nine months since the original defect was discovered.
"We'll press on now to get the job done with minimum disruption to bridge users."
Work at the North East main span is expected to be complete by the end of this year.
(LM/CD)
