ATP-dependent DNA helicase involved in DNA damage repair by homologous recombination and in genome maintenance. Capable of unwinding D-loops. Plays a role in limiting crossover recombinants during mitotic DNA double-strand break (DSB) repair. Component of a FANCM-MHF complex which promotes gene conversion at blocked replication forks, probably by reversal of the stalled fork. ATP + H2O = ADP + H(+) + phosphate Interacts with the MHF histone-fold complex to form the FANCM-MHF complex. Belongs to the DEAD box helicase family. DEAH subfamily. FANCM sub-subfamily.