Non-catalytic component of the WMM complex, a complex that mediates N6-methyladenosine (m6A) methylation of mRNAs, a modification that plays a role in the efficiency of mRNA splicing and is required for sex determination (PubMed:27919077, PubMed:28675155). In the heterodimer formed with Ime4/Mettl3, Mettl14 constitutes the RNA-binding scaffold that recognizes the substrate rather than the catalytic core (By similarity). Required for sex determination and dosage compensation via Sxl alternative splicing: m6A methylation acts as a key regulator of Sxl pre-mRNA and promotes female-specific alternative splicing of Sxl, which determines female physiognomy (PubMed:27919077, PubMed:28675155). M6A methylation is also required for neuronal functions (PubMed:27919077). Component of the WMM complex, a N6-methyltransferase complex composed of a catalytic subcomplex, named MAC, and of an associated subcomplex, named MACOM (PubMed:29535189, PubMed:28675155, PubMed:29555755). The MAC subcomplex is composed of Ime4/Mettl3 and Mettl14 (PubMed:29535189, PubMed:28675155, PubMed:29555755). The MACOM subcomplex is composed of fl(2)d, Flacc/Xio, Hakai, vir, and, in some cases of nito (PubMed:29535189, PubMed:29555755). Ubiquitously expressed in early embryonic stages with enrichment in the neuroectoderm at later stages. Flies have a reduced lifespan and exhibit multiple behavioral defects: flight and locomotion are severely affected and they spend more time grooming (PubMed:27919077, PubMed:28675155). They also display a mild held-out wing appearance resulting from failure to fold their wings together over the dorsal surface of the thorax and abdomen (PubMed:27919077, PubMed:28675155). Belongs to the MT-A70-like family.