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Mean right and left ear hearing level thresholds (dB HL)
| Aircraft type | Ear | Frequency (kHz) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| 0.25 | 0.5 | 1 | 2 | 3 | 4 | 6 | 8 | ||
| Fixed wing | Right | 10.3 | 11.2 | 10.5 | 8.7 | 12.6 | 13.6 | 17.3 | 16.7 |
| Left | 9.2 | 11.4 | 11.6 | 9.6 | 15.2 | 13.6 | 23.7 | 21.2 | |
| Rotary wing | Right | 7.4 | 9.8 | 9.9 | 7.4 | 11.0 | 12.6 | 10.5 | 8.7 |
| Left | 7.7 | 9.4 | 10.2 | 8.6 | 11.1 | 12.6 | 13.3 | 10.8 | |
