Aircraft mechanics and aviation maintenance technicians (AMTs) work in one of the most acoustically complex occupational environments in any industry — test cell engine runs, ramp operations during active aircraft turns, rivet guns and pneumatic tools in hangar bays, and the sustained noise of ground support equipment create a combined exposure profile that varies dramatically by task and location throughout a single shift. The CDC estimates 22 million U.S. workers face hazardous occupational noise each year, and aircraft mechanics are a meaningful segment of that total.
Soundtrace provides automated audiometric testing, real-time noise monitoring, and HPD fit testing in a unified platform for employers across the industries where aircraft mechanics work.
OSHA 1910.95 applies to aircraft maintenance technicians employed in general industry hangar and MRO operations. FAA has no occupational noise standard equivalent to OSHA's HCP requirements — OSHA is the governing framework for AMT hearing conservation. Engine test cell operations and active ramp work routinely produce TWAs that exceed OSHA's 90 dBA PEL for the duration of the task.
Measured Noise Exposure Levels
| Operation | Typical Noise Level | OSHA Max Duration |
|---|---|---|
| Engine run-up / ground test (nearby) | 120–140 dBA | Seconds without HPD |
| Engine test cell (observation area) | 100–115 dBA | Under 30 minutes |
| Rivet gun (structural repair) | 105–118 dBA | Duration of riveting |
| Pneumatic impact wrench (aircraft) | 100–110 dBA + impulse | Duration of use |
| Aircraft APU (nearby on ramp) | 95–105 dBA | Duration of APU operation |
| Ground power unit (GPU) | 88–98 dBA | Full turn duration |
| Hangar bay ambient (active maintenance) | 84–94 dBA | Full shift |
| Sheet metal fabrication (repair shop) | 90–100 dBA | Duration of task |
| Angle grinder (composite/metal repair) | 95–105 dBA | Duration of use |
OSHA Requirements
Under 29 CFR 1910.95, employers must implement a hearing conservation program when any worker's 8-hour TWA meets or exceeds 85 dBA. Required elements:
- Noise monitoring to establish documented TWA for each exposed worker
- Baseline audiogram within 6 months of first qualifying exposure (preceded by 14 hours of quiet)
- Annual audiograms compared to baseline for standard threshold shift (STS) detection
- Hearing protection provided at no cost in a variety of types and styles
- Annual training covering noise hazards, HPD use, and audiometric results
- Recordkeeping per 1910.95(m) — noise measurements, audiograms, training documentation
See: OSHA 1910.95: All 6 Elements Explained
FAA Fitness-for-Duty vs. OSHA Hearing Conservation: Two Separate Obligations
FAA medical certification requires pilots and some other certificate holders to meet hearing standards for fitness for duty. This is entirely separate from OSHA's occupational hearing conservation requirements, which govern employer obligations to protect AMT workers from noise-induced damage during maintenance operations.
An AMT who meets FAA hearing standards for their A&P certificate may still be experiencing occupational NIHL accumulation that is detectable on OSHA audiometric surveillance — particularly in the high-frequency range above the speech frequencies FAA certification evaluates. The FAA medical exam is not a substitute for OSHA hearing conservation program audiometry.
An aircraft mechanic who has spent 15 years doing engine run-ups and rivet work without a systematic hearing conservation program has accumulated cochlear dose that an FAA Class 3 medical may not detect until it reaches speech-frequency involvement — at which point both the occupational damage and the WC liability are already severe.
See: Hearing Protection Fit Testing: What Employers Need to Know and Workers' Compensation for Occupational Hearing Loss
Workers' Compensation Exposure
Occupational hearing loss WC claims are routinely filed years or decades after the causative exposure. Without a documented baseline audiogram, employers cannot establish what hearing the worker had at hire — making every dB of loss present at claim filing presumptively attributable to the current employer.
A complete audiometric record, maintained from day one of employment, is the only document that allows an employer to separate their noise exposure period from everything that came before and after.
See: Workers' Compensation for Occupational Hearing Loss and Noise-Induced Hearing Loss: The Employer's Complete Guide
Frequently Asked Questions
Yes, when their 8-hour TWA meets or exceeds 85 dBA. Many aircraft mechanics in active operations regularly meet or exceed this threshold. OSHA 1910.95 requires employers to enroll qualifying workers in a hearing conservation program including audiometric testing, hearing protection, training, and recordkeeping.
Noise-induced hearing loss (NIHL) is the primary occupational hearing condition. It typically presents first as a 4,000 Hz notch on audiometry before progressing to involve 3,000 and 6,000 Hz. The loss is permanent and irreversible once established, which is why early detection through annual audiometry is critical.
Yes. Occupational hearing loss is compensable in all U.S. states when a worker can establish that their hearing loss was caused or contributed to by workplace noise exposure. Claims are routinely filed years or decades after the exposure period. Employers with complete audiometric records and documented noise measurements are far better positioned to contest causation or support apportionment.
A compliant hearing conservation program includes noise monitoring to document TWA, baseline and annual audiograms, hearing protection at no cost, annual training, and complete recordkeeping. Individual HPD fit testing — measuring each worker's personal attenuation rating (PAR) — is the only method that verifies actual protection rather than assuming label NRR performance.
Hearing protection must provide adequate attenuation for the actual measured TWA. Individual fit testing verifies each worker's personal attenuation rating (PAR). At higher exposure levels — above 100 dBA — double protection combining earplug and earmuff is often required to achieve adequate attenuation.
In-house audiometric testing for aviation operations
Soundtrace delivers OSHA-compliant audiometric testing and noise monitoring for aviation employers — automated STS detection, 30-year cloud retention, and licensed audiologist supervision.
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