* ECB chief says 2016 will be another challenging year
* Draghi's remarks echo sentiment among some U.S. peers
* ECB economist says would act to counter further shock (Re-casts, adds minutes)
By Francesco Canepa and John O'Donnell
FRANKFURT, April 7 (Reuters) - Top European Central Bank officials drew the boundaries of future action on Thursday, saying the bank had no plan to transfer "helicopter" money directly to Europeans but remained willing to take smaller steps to counter global slowdown.
"We are not considering anything of that sort. So it's not on the table in any shape or form," ECB Vice President Vitor Constancio told lawmakers in the European Parliament, commenting on the concept of making direct payments to citizens, cited by some as a last resort.
His remarks, echoing those of the central bank's chief economist, Peter Praet, establish an effective outer limit on ECB action although a range of lesser measures, such as extending ECB buying of government bonds, remain open.
Since the Chinese economy, once the engine of global growth, began to falter, the prospects are fading for big exporting nations such as Germany, the bedrock of the euro zone.
In an attempt to revive the 19-member currency bloc's fortunes, the ECB has rolled out ever more ambitious money-printing schemes to buy bonds and other assets and it will soon start to even pay banks to borrow its money so long as they lend more.
Despite taking this action, however, many in Frankfurt remain concerned, not least because of the bleak outlook for the global economy.
Echoing his U.S. peers' worries about an uncertain future, Mario Draghi wrote on Thursday in the ECB's annual report that the year ahead would be a challenging one.
"We face uncertainty about the outlook for the global economy. We face continued disinflationary forces. And we face questions about the direction of Europe and its resilience to new shocks," he wrote.
"NO SURRENDER"
Draghi's downbeat tone was similar to that of policymakers at the Federal Reserve, minutes of whose mid-March policy meeting, released on Wednesday, said "participants generally saw global economic and financial developments as continuing to pose risks".
Draghi insisted that "the ECB does not surrender to excessively low inflation", a message that suggests willingness to act.
Such action could involve a revamp of the ECB's bond-buying scheme, for instance, ECB chief economist Praet said on Thursday.
But the ECB's freedom of manouevre is limited by the need for the support of 19 sometimes-reluctant central bank chiefs from the bloc's member states.