Sound pressure level measurements in nine different jet cockpits.
| Jet data | Sound pressure data | ||||||
| Type | Flight time (min) | ATC time (min) | ANFt dB(A)f | AMfFt dB(A)f | AMiFt dB(A)i | AMcATC dB(A)f | SNR dB(A) |
| A310-200 | 162 | 70 | 74.9 | 81.9 | 87.9 | 83.5 | 8.6 |
| A310-300 | 460 | 208 | 76.7 | 86.7 | 92.7 | 88.1 | 11.4 |
| B737-200 | 221 | 81 | 76.8 | 81.4 | 87.4 | 83.8 | 7.0 |
| B737-300 | 137 | 28 | 77.3 | 80.9 | 85.9 | 85.8 | 8.5 |
| B747 | 1144 | 344 | 79.9 | 84.8 | 89.9 | 88.0 | 8.1 |
| B757 | 357 | 134 | 75.1 | 83.7 | 89.9 | 86.0 | 10.9 |
| B767 | 294 | 112 | 74.4 | 81.6 | 87.9 | 83.8 | 9.4 |
| DC10 | 116 | 50 | 76.8 | 85.9 | 91.2 | 87.6 | 10.8 |
| MD11 | 153 | 73 | 75.0 | 84.6 | 90.3 | 85.8 | 10.8 |
AM, acoustic manikin; AMcATC, spectral-corrected values of AMfFt by ISO 11 904-2 and calculated to the ATC time; AN, free-field ambient noise; ATC, air traffic control; dB(A)f, sound pressure level with A-weighting and time constant: fast; dB(A)i, with time constant: impulse; Ft, flight time; SNR, signal-to-noise ratio.
ANFt measurement data during flight time are presented as well as data from an AM. Measurement data from Hoffmann.10
AMcATC are calculated values by using the ISO 11904-2 (11) and the ATC time.