* Open to single or twin-engined jets
* Must be built largely in India (Adds Lockheed Martin's comment)
By Sanjeev Miglani
NEW DELHI, April 6 (Reuters) - India is seeking to buy around 110 fighter jets, the air force said in a request for information issued on Friday, marking the first step toward a long-delayed deal that could be worth more than $15 billion.
Boeing, Lockheed Martin, Saab and Dassault Aviation are among the manufacturers expected to compete.
The aircraft must be built largely in India as part of Prime Minister Narendra Modi's drive to build a domestic industrial base.
The air force said in a notice that "85 percent will have to be made in India by a Strategic Partner/Indian Production Agency".
Lockheed has offered to move its F-16 production line in Fort Worth, Texas, to India and make it the only plant worldwide to produce the F-16 for not only India but also other countries, said Vivek Lall, vice president, strategy and business development at Lockheed Martin.
Lockheed has teamed with India's Tata Advanced Systems to build the planes locally while Sweden's Saab has entered into a partnership with the Adani Group, a resources conglomerate. The other contenders have not announced their local partners.
The tender will be open for makers of both single engine and twin-engined combat jets, in a widening of the field. The Eurofighter Typhoon and Russian aircraft are also potential contenders under the new requirements.
A spokesman for Dassault Aviation which makes the twin-engine Rafale declined to comment.
Earlier, the defence ministry had sought expressions of interest from single-engine manufacturers which effectively restricted the contest to Lockheed's F-16 and Saab's Gripen fighter jets.
But in February the government asked the air force to open up the competition to twin-engined aircraft, in the latest flip-flop in policy that has delayed the acquisition process for years and left the air force short of hundreds of planes.
India began its search for new planes for the Indian air force in 2003 to replace its Soviet-era MiG fighters.
The request for information is open until July, the air force said. A request for proposal will then be issued followed by bid evaluations and contract negotiations. The process could take years, officials say. (Additional reporting by Cyril Altmeyerhenzien in Paris; editing by Jason Neely and Eric Meijer)