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KMID : 0383119590070010063
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Journal of Aerospace Medicine
1959 Volume.7 No. 1 p.63 ~ p.65
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AN AIRCRAFTF INCIEDENT DUE TO RAPID DECOMPRESSION AT 34,000 FEET ALTITUDE
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김의식:Kim Eui-Sik
:Sun Yun-Huan/:Ko Haen-Sam
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Abstract
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FOREWORD
Cabin pressurization brought a problem of rapid or explosive decompression caused by sudden loss of cabin pressure.
When rapid decompression takes place, the organs filled with gases will be affected by expansion which follows the fundamental gas laws.
The gas filled organs are nasal cavities, paranasal sinuses, tympanic cavities, respiratory system and gastrointestinal tract.
Rapid decompression does not produce ear pain or sinus pain provided that no pathologic conditions of nasal cavities, paranasal sinuses nor stenosis of the Eustachian tube exist.
The symptoms caused by rapid decompression are mainly due to the increase of intrathoracic and intraabdominal pressure. The increase of intrathoracic and intraabdominal pressure causes impairment of cardiac filling, decrease of cardiac output, sudden drop of arterial blood pressure and increase of venous pressure.
Spinal fluid pressure increases within normal limits with the increase of intrathoracic pressure.
CASE REPORT
The pilot was 30 years old. With a bang almost all of the canopy was lost at 34, 000 feet. The pilot felt that the upward push of his body, heard his own voice of groaning produced automatically and the next moment he lost his consciousness.
After a moment he recovered his consciousness and could notice the fog at the bottom of the cockpit.
But at that time he took the fog for fire and checked fire warning light and other instruments. The readings were normal. Checking the instruments and noticing a severe wind blast, became aware of the rapid decompression.
He covered his eyes with his visor when he began diving and leveled off at 9.000 feet. It took 2 minutes to reach 9.000 feet from 34.000 feet.
2 minutes after the rapid decompression he landed at the base. Immediately after the landing he noticed severe abdominal pain but the degree of pain was such that conversation was not disturbed. Intake of camphorated opium tincture and whisky if a min wear glass 33, or visor when rapid decompression takes place, then temporary important of vision will be a problem due to fogging lenses or visor.
It is important to fix the body with lap belt and shoulder harness at all time during flight. A visor is indispensable to prevent wind blast.
The Change of the Eosinophil level due to Flying Training
Aero-Medical Laboratory Tae Jun Lee 100 persons of pilot cadets in the course of combat pilot training and instructor pilots were taken as subjects. They were divided into 2 groups; one was eos inoph-
ilia group urethra parasite, the other´ was none parasite groups.
Blood specimens were taken at 3 hours periods of 12 hours, from 7 am to p.m The basal counting is based on the value of 7 a. m. and diurnal changes of eosinophil level is expressed as percentage.
The eosinophil level on rest day, flying day and link training day was observed respectively and comparatively.
1. Flying level C hour flight) as compared with control level on rest day in pilot cadets showed the most remarkable decrease at 1 p.m. and no distinguishable difference at 4 &7 p. m.
2. More marked eosinopenia was resulted in pilot cadets of 1 hour fling than that in instructor pilots of 2 hours flying.
3. There were, no notable differences between link training level and control level.
4. Eosinophil response due to flying was expressed also sufficiently in parasite group, but decreasing rate in comparison with no parasite group was rather small.
5. Considering the ability of pilots, it. appears to be interesting phenomenon that individual differences of eosinophil response in the same group and, under the same flying time were fairly marked.
Mathematical Formula Expressing Human Tolerance To Ionizing Radiation
Sung Jang Chung
The ´author theoretically constructed a mathematical formula expressing approximately human tolerance to ionizing radiadiation. The formula expresses the mortality of humans in terms of intensity of radiation and duration of exposure in whole body external irradiation. Data concerning maximum permissible doses were presented, which were derived from the above formula.
Further more reliable data on human tolerance are needed to derive a complete formula.
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KEYWORD
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