* France deploys planes, boats, helicopters in expanded search
* More debris found, though no confirmed links to MH370
* Malaysian plane missing since March 2014
* Angry families want answers, demand Malaysia finds passengers (Adds China protests, comments from Malaysian transport minister, Australian deputy prime minister's office, paragraphs 8, 10-14)
By Al-Zaquan Amer Hamzah and Trinna Leong
KUALA LUMPUR, Aug 7 (Reuters) - Kuala Lumpur has asked for more help in the search for a Malaysia Airlines plane missing for more than a year, with France to send planes, boats and helicopters to scour the coast of a remote Indian Ocean island where debris washed up.
Investigators on the French-governed island of Reunion have collected a piece of wing that Malaysia has said came from MH370, the first real clue in one of the greatest mysteries in aviation history.
MH370, a Boeing (NYSE:BA) BA.N 777, disappeared in March 2014 en route from Kuala Lumpur to Beijing with 239 passengers and crew on board, most of them Chinese.
A piece of wing known as a flaperon was found on a Reunion beach last week. Malaysia said on Thursday paint colour and a maintenance seal were matches for MH370, the first piece of direct evidence that it had crashed in the sea.
The barnacle-covered piece of wing debris was flown to mainland France for investigation. Reunion is about 3,700 km (2,300 miles) west of the primary search area off the southwest coast of Australia.
Malaysian Transport Minister Liow Tiong Lai said he would seek expert advice before asking Australia, which is leading the underwater search, to modify its efforts.
France said on Friday it was ramping up its search off the coast of Reunion after additional debris, including a plane window and aluminium foil were found.
However, none of the new debris appeared to have come from MH370, a spokesman for Australian Deputy Prime Minister Warren Truss said.
The French decision to devote additional planes, helicopters, patrol boats and personnel to the area came as Malaysia also appealed to the governments of Mauritius and Madagascar, near Reunion, to help widen the search area.
The discovery of the flaperon sparked anger and scepticism among grieving Chinese families who want clearer answers and have accused Malaysia of withholding information. ID:nL3N10H2JQ
On Friday, about 50 family members staged a noisy protest near the Malaysian embassy in Beijing. They scuffled briefly with police who stopped them from entering a road leading to the embassy.
"Malaysia, find the passengers," the protesters chanted. Some carried signs that said: "Malaysia hides the truth, Malaysia delays the search".
Liow said he understood family members wanted answers about what happened to the passengers on board. "They're anxious, and we're also looking for answers," he told Reuters.
An initial search of a 60,000 sq km (23,000 sq miles) patch of sea floor has been extended to another 60,000 sq km but Australia has not been asked to extend its search area, Truss' spokesman said. Canberra had no plans to do so based on models of drift patterns any debris might have taken.
Brian Alexander, a lawyer with U.S. firm Kreindler & Kreindler LLC, which represents 48 families of MH370 passengers from around the world, said the flaperon alone would be unlikely to present enough evidence to inform a legal case about the cause of the crash.
"If they recover additional pieces and additional evidence, there could be a different dynamic from the legal perspective concerning airline manufacturers," Alexander said.