APU Sound Model Tutorial. Overview. KC-135R APU Sound Recording/Analysis V + Modeling. KC-135R APU. KC-135R Has Two APU’s Units are Located in Open Aft Cabin Area Sound Level is Significant in Cockpit. Notes on Recording. Need Calibrated SPL Microphone
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Brighter Colors Are Greater Amplitudes
Bleed Air Valve Open
Turbine Discrete Blade Passing Frequency
(DBPF – NTSB term)
Removed Turbine DBPF