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Effects of long-hose breathing.
Aviation, Space, and Environmental Medicine
|February 1, 1978
Summary
Aircrew breathing hoses require length limits based on altitude and activity. Longer hoses are acceptable at higher altitudes, but shorter hoses are recommended at lower altitudes and ground level to ensure safety.
Area of Science:
- Aerospace Medicine
- Human Factors Engineering
- Physiology
Background:
- Aircrew members require breathing apparatus with hoses connecting regulators to masks.
- New transport aircraft designs and cargo operations with open rear doors necessitate the use of longer breathing hoses.
Purpose of the Study:
- To investigate the impact of long breathing hoses on aircrew.
- To determine acceptable hose lengths based on altitude, work of breathing, oxygen consumption, and comfort.
Main Methods:
- Examined induced work of breathing through varying hose lengths.
- Assessed changes in oxygen consumption and subject comfort.
- Evaluated these factors in relation to altitude, hose length, and exercise levels.
Main Results:
- Above 18,000 ft, a 30-ft hose is acceptable for all work levels.
- Between 13,000-18,000 ft, an 18-ft hose is preferred.
- Below 13,000 ft, hose length should not exceed 12 ft; at ground level, 6 ft is recommended for non-sedentary activity.
Conclusions:
- Breathing hose length recommendations are altitude-dependent to optimize aircrew performance and safety.
- Rapid decompression scenarios limit hose length to 18 ft due to dead space concerns.
- Optimal hose length balances physiological demands with operational requirements for aircrew breathing systems.