AAIB Report: Airbus A319-111, Obscured pilot vision caused by misted oxygen mask
During a smoke and fumes event on an Airbus A319-111 (G-EZNM) the pilots鈥� oxygen masks misted up shortly after donning. This was due to a combination of the environment in which they were stowed, the crews鈥� breathing rate and the condition of the lenses, 11 May 2019.
During a smoke and fumes event on an Airbus A319-111 (G-EZNM), the lenses of both pilots鈥� oxygen masks misted when donned, obscuring their vison. 皇冠体育app commander removed his mask so he could see the flight instruments. 皇冠体育app aircraft diverted to Birmingham and landed without further event.
皇冠体育app investigation found that the masks misted up due to a combination of the environment in which they were stowed and the condition of the lenses. 皇冠体育app source of the smoke was probably an accumulation of dust in the transformer rectifier unit (TRU).
皇冠体育app aircraft manufacturer has added a cleaning procedure for the TRU in the Aircraft Maintenance Manual. 皇冠体育app operator has added a practical demonstration on the use of the mask and its selectors during its recurrent training cycle.