What is a Navy cranial?
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The U.S. Navy Flight Deck Crewman Sound Attenuating Helmet Assembly is commonly called “the cranial” (see Figure 3, left insert). The HGU-24/P cranial includes a sound-powered microphone and headset assembly for communication while the HGU-25(V)2/P cranial does not include communications capability.
What sound is 40 decibels?
Comparative Examples of Noise Levels
| Noise Source | Decibel Level | Decibel Effect |
|---|---|---|
| Library, bird calls (44 dB); lowest limit of urban ambient sound | 40 | One-eighth as loud as 70 dB. |
| Quiet rural area. | 30 | One-sixteenth as loud as 70 dB. Very Quiet. |
| Whisper, rustling leaves | 20 | |
| Breathing | 10 | Barely audible |
What is a white shirt on an aircraft carrier?
Also known as “brake riders,” they man the cockpit during repositioning on the flight deck and hangar deck. White shirts consist of safety and medical personnel, catapult final checkers and catapult and arresting gear quality- assurance inspectors, and administrative personnel.
What is noise notch pattern of hearing loss among military personnel?
Examples of Noise-Notch Patterns of Hearing Loss Among Military Personnel. An upturn at 8000 Hz, a characteristic of the noise notch, could be seen in the Navy data, but Air Force personnel were not tested at that frequency. The average hearing thresholds were higher with greater length of service or at older ages.
What are the sources of hazardous noise in the military?
Obvious sources of potentially hazardous noise are weapons systems and jet engines, but vehicles, other aircraft, watercraft, communication systems, and industrial-type activities also serve as sources of potentially damaging noise. Suggested Citation: “3 Noise and Noise-Induced Hearing Loss in the Military.” Institute of Medicine. 2006.
Who is responsible for noise surveys for Marine Corps facilities?
The Navy is also responsible for noise surveys for Marine Corps facilities. To date, data on sound pressure levels are routinely collected at Navy and Marine Corps facilities but are not routinely transferred to a central database.