Closed door flight test investigation of cabin noise exposure in the NRC Bell 412 helicopter
Bibliographic record
Abstract
Aircraft noise affects crew communication and comfort and continued exposure can lead to hearing loss if the personnel hearing protection is insufficient or improperly worn. Therefore, evaluation of the noise levels experienced by helicopter aircrew is essential in order to select optimum hearing protection solutions to enhance aircrew safety and reduce the potential for health issues in the long term. Cabin noise exposure of crew members was investigated in the NRC Bell 412 helicopter, the civilian variant of the CH-146 employed by the RCAF and the results were compiled with regard to the acoustic specifications of hearing protection devices in use during missions. The tests were conducted in accordance with standard test procedures ISO 5129:2001 “Acoustics - Measurement of sound pressure levels in the interior of aircraft during flight” and MIL-STD-1294A “Acoustical noise limits in helicopters”. Acoustic sound pressure levels (SPL) were recorded in the aircraft interior at different crew station locations during various flight conditions.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".