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Printed page 32. PDF page 32.
events mentioned after 09:36:27 are only based on the analysis of the CVR (recording and spectral analysis). The Engine No. 1 N1 frequency could not be heard on CVR and was therefore could not be analysed. 1.1.9.3. From 09:36:28 toOpen official document at PDF page 32Final investigation report: PIA 8303, AP-BLD
Printed page 33. PDF page 33.
09:38:39 and from 09:38:46 the Engine sound could no longer be detected from the CVR spectral analysis. The minimum Engine No. 2 N1 speed was 42 % from CVR spectral analysis. A single "Stall" synthetic callout followed 1 s laterOpen official document at PDF page 33Final investigation report: PIA 8303, AP-BLD
Printed page 53. PDF page 53.
However, availability of CVR helped in limited analysis of Engine parameters through spectral analysis. CVR and DFDR were synchronized and UTC time in DFDR was used as a standard reference throughout the investigation process. After the end of DFDR recordingOpen official document at PDF page 53Final investigation report: PIA 8303, AP-BLD