Four Sukhoi Superjet 100s operated by Aeroflot have been cleared for flight after being temporarily restricted to fix technical snags.
Russia's federal aviation regulator, Rosaviatsia, has reinstated airworthiness certificates on all four twinjets.
"Deficiencies detected have been eliminated in co-operation with the airline," says Sukhoi's civil aircraft division.
Aeroflot has 10 Superjets. The regulatory action followed landing-gear retraction issues on two Aeroflot aircraft, while two others had previously suffered slat problems.