A20s Not Quiet Enough. Ideas?

Cockpit noise in high-decibel piston aircraft presents a genuine occupational health challenge for flight instructors and working pilots who accumulate significant hours in aircraft like the Piper SuperCub, where cabin noise levels routinely exceed 100 dB(A) — well above the FAA's recommended 85 dB(A) threshold for extended exposure. Active noise reduction headsets such as the Bose A20 are engineered primarily to attenuate low-frequency continuous noise, which they accomplish effectively in most training and general aviation platforms. However, in exceptionally loud aircraft with high engine harmonics, exhaust proximity, and minimal soundproofing, even premium ANR headsets may not provide sufficient protection to prevent cumulative fatigue and long-term auditory risk.

The double-protection approach — foam earplugs worn beneath an ANR headset — is a recognized strategy used by military aviators and ground crews operating in high-noise environments, and it does meaningfully reduce overall sound exposure. The intelligibility problem this pilot encounters is common and solvable. The solution lies not in removing the foam plugs, but in increasing the intercom and radio volume output to compensate. Most intercom systems, including panel-mounted units and headset-integrated controls on the A20, allow volume adjustment that can offset the added attenuation. Custom-molded earplugs with filtered acoustic channels, such as those made by Etymotic or Sensear, are another option — they provide consistent and significant noise attenuation while preserving speech-frequency clarity better than standard foam plugs, making them particularly well-suited for this dual-layer application.

Beyond immediate comfort, the fatigue this instructor describes is a documented physiological response to sustained high-amplitude noise exposure, not merely an inconvenience. Auditory fatigue can degrade cognitive performance, increase stress response, and reduce situational awareness — all meaningful concerns in a dual-instruction environment where clear communication between instructor and student is operationally critical. The FAA Civil Aerospace Medical Institute has noted that noise-induced hearing loss remains prevalent among general aviation pilots, particularly those accumulating hours in loud piston and tailwheel aircraft over careers spanning decades. CFIs flying high-hours in SuperCubs, Citabrias, and similar aircraft face disproportionate exposure risk compared to those flying newer, better-insulated platforms.

Broader solutions worth evaluating include aftermarket cabin noise treatments such as mass-loaded vinyl or acoustic foam applied to firewall and floor panels, which can reduce structure-borne and airborne noise before it reaches the headset entirely. Some operators of particularly loud aircraft have also transitioned to in-ear monitor-style headsets combined with custom-fit earplugs that incorporate the receiver directly into the ear canal, effectively bypassing the need for an over-ear cup altogether and achieving high passive attenuation with clear audio. These systems, while less common in general aviation training fleets, are used in aerobatic and experimental aircraft communities where cabin noise levels are similarly extreme. For any pilot spending regular professional hours in high-noise environments, annual audiometric testing is a prudent practice regardless of headset choice, as early detection of threshold shift remains the most actionable defense against permanent occupational hearing loss.