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Figure 9. Noise level (1/3 oct. bands) in an armoured vehicle: 121 dB SPL, 108 dBA (solid thick line); in a turboprop plane : 117 dB SPL, 99.2 dBA (solid thin line); under the pilot's headset to the turboprop plane with the voice communication system "ON": 117 dB SPL, 99.7 dBA (dashed line)

Figure 9. Noise level (1/3 oct. bands) in an armoured vehicle: 121 dB SPL, 108 dBA (solid thick line); in a turboprop plane : 117 dB SPL, 99.2 dBA (solid thin line); under the pilot's headset to the turboprop plane with the voice communication system