21 seconds after external noise, 3 hydraulic systems of AZAL plane failed - REPORT

Four seconds after the first external noise the 3rd hydraulic system failed, followed by the failure of the 1st hydraulic system 6 seconds later, and the 2nd hydraulic system 21 seconds later.

As Report informs, this was noted in the preliminary investigation report conducted in accordance with the requirements of Annex 13 of the 1944 Chicago Convention on International Civil Aviation of the International Civil Aviation Organization regarding the AZAL plane crash.

"Due to adverse weather conditions the aircraft unsuccessfully attempted to land in Grozny two times, and then the captain decided to return to Baku. Following this decision, the (CVR) recorded two external noises, occurring with 24 seconds interval, over Grozny. Analysis of the CVR and FDR data showed that 4 seconds after the first external noise the 3rd hydraulic system failed, followed by the failure of the 1st hydraulic system 6 seconds later, and the 2nd hydraulic system 21 seconds later," reads the report.