Safety Investigation Report 2018:2 Analysis/2.3 Medical Human Factors/2.3.4
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SAFETY INVESTIGATION REPORT MH370 (9M-MRO)
2.3 MEDICAL/HUMAN FACTORS ISSUES
2.3.4 Human Factor Aspects of Air Traffic Control Recordings
- 1) Voice analysis
No Cockpit Voice Recorder (CVR) and Flight Data Recorder (FDR) analysis could be done as the wreckage is yet to be found. From the available information, the speech segments for the first 3 sets of audio recordings (Airway Clearance Delivery, Lumpur Ground and Lumpur Tower) were those of the FO before take-off and the 4th and 5th sets of the audio recordings (Approach Radar and Lumpur Radar) originated from the PIC after take-off.
The Team has noted nothing unusual in the conversations by the PIC and the FO with the assigned traffic Controllers. The last sentence of “Good Night Malaysian Three Seven Zero” was spoken by the PIC at 1719:30 UTC [0119:30 MYT]. - 2) Air Traffic Control Recordings
Radiotelephony recordings between the flight crew and the Air Traffic Controllers were analysed for voice recognition and it was verified that the words spoken before take-off and after take-off were that of the FO and PIC respectively. The Team has made comparison of the voice sample analysis recorded previously and found no evidence that there was any stress or anxiety detected in the conversations. It was noticed that the PIC made the same statement of “maintaining flight level three five zero’ twice at 1701.17 UTC [0107.57 UTC [0107.56 MYT]. However, the Team did not find any significance of that statement spoken twice by PIC in a short interval of 6.39 minutes.