Cockpit noise and pilot hearing loss: levels, limits and headsets

How loud is a cockpit?

On airliners the best published figures come from two studies. Müller and Schneider (BMJ Open, 2017) measured nine jet types and found ambient flight deck levels from 74.4 dB(A) in a B767 to 79.9 dB(A) in a B747. Lindgren and colleagues (International Journal of Audiology, 2008) measured gate-to-gate equivalent levels of 75 to 81 dB(A) across a Swedish airline's fleet, with short peaks of 105 dB(A) from the cabin call chime.

Light aircraft and helicopters are louder at the ear. The FAA's pilot safety brochure Hearing and Noise in Aviation (AM-400-98/3) lists 70 to 90 dB for a small single cockpit and 80 to 102 dB for a single-rotor helicopter cockpit. Those are ranges, not type figures; what reaches your eardrum depends on the headset and the volume you set.

Which noise limit applies to pilots?

NIOSH recommends 85 dBA as an 8-hour time-weighted average and calls exposures at or above it "hazardous". It uses a 3 dB exchange rate: every 3 dB more halves the allowed time, so 88 dBA reaches the limit in 4 hours, 91 dBA in 2 hours and 94 dBA in 1 hour (NIOSH 98-126, Table 1-1). NIOSH estimates an 8% excess risk of noise-induced hearing loss over a 40-year working life at 85 dBA, against 25% at 90 dBA.

OSHA's enforceable limit is 90 dBA for 8 hours with a 5 dB exchange rate, so 4 hours is allowed at 95 dBA (29 CFR 1910.95, Table G-16), and a hearing conservation program starts at an 85 dBA average. Under a 2013 FAA policy statement OSHA enforces that standard for cabin crew on aircraft in operation; flight crew are excluded and stay under the FAA.

The EU's Directive 2003/10/EC sets a lower action value of 80 dB(A), an upper action value of 85 dB(A) and an exposure limit of 87 dB(A), all as daily exposure over 8 hours. Article 3(2) says the limit takes account of the attenuation of the hearing protectors worn and the action values do not. Safe Work Australia's exposure standard is 85 dB averaged over 8 hours and 140 dB peak, with time halving for each 3 dB ("91 decibels over two hours is the same as 85 decibels over eight hours").

Does the radio in your headset add to the dose?

Yes. Müller and Schneider measured the communication level under the headset with an acoustic manikin and found it 7 to 11 dB(A) above the ambient noise, with a signal-to-noise ratio of about 10 dB(A). Corrected to time on the radio, the under-headset level ran from 83.5 dB(A) (A310-200) to 88.1 dB(A) (A310-300).

The same study audiogrammed 487 pilots and found the left ear worse at 3, 4 and 6 kHz, the gap growing with age. Pilots who mostly used the left ear for radio work showed mean left-right differences of 6 dB at 3 kHz, 7 dB at 4 kHz and 10 dB at 6 kHz. The authors conclude that active noise reduction lets you run the radio below the 85 dB(A) upper action value; in their discussion they put it below the 80 dB(A) lower action value.

What do passive and ANR headsets do?

The FAA brochure says communication headsets give about the same attenuation as earmuffs, sealed foam earplugs give 30 to 35 dB, and ANR works best on low-frequency noise. It recommends plugs with earmuffs or a headset above 115 dB and calls plugs plus an ANR headset the most protection current technology offers.

ANR has limits. Wagstaff and colleagues (Aviation, Space, and Environmental Medicine, 1998) measured sound within 5 mm of the eardrum in recorded helicopter noise and found substantial low-frequency reduction with ANR on, but somewhat higher mid-frequency levels, more so with communication noise added. Gower and Casali (Human Factors, 1994) found an ANR headset needed a higher speech-to-noise ratio for the same intelligibility, while noting it may protect more in low-frequency noise.

Do pilots lose more hearing?

The evidence is mixed. Lindgren's 664 Swedish airline pilots had hearing similar to a non-noise-exposed reference group at every age. Wagstaff and Arva (2009) followed 182 Norwegian airline pilots, helicopter pilots and air traffic controllers over 2 to 3 years and found small but significant threshold increases at 4 kHz in all three groups, with helicopter pilots no worse than airline pilots.

Other studies report more loss. Of 235 Spanish pilots examined at an aerospace medicine centre in Madrid, 64.3% had hearing loss, linked to age and flight hours (Nutrients, 2022). In 100 Iranian pilots (57 fixed-wing, 43 helicopter), 45 had some impairment, linked to age, experience and flight hours, with helicopter pilots worse (2025). These cross-sectional studies show association, not cause. The FAA notes that noise damage starts near 4,000 Hz, outside the conversation range, and can go unnoticed for some time.