A pressure altimeter is one of the critical components in an aircraft. The device is deployed in measuring height above specific pressure levels. The device compares the atmospheric pressure outside the aircraft to a standard pressure of 29.92” Hg of the normal air at the seal level. Altimeter devices in aircraft are fitted with stacks of sealed aneroid wafers containing an internal pressure of 29.92” Hg (Bo et al., 2017) . The wafers contract or expand depending on static pressure in the altimeter case. The angle of an aircraft elevation is indicated in the pressure altimeter. An increasing static pressure compresses the wafers causing them to collapse. On the other hand, a lower static pressure provides for the expansion of the wafers. The concept of "high to low or hot to cold, look out below" is deployed to evaluate the impact on nonstandard temperature and pressure. Aircraft flights could turn out hazardous in the absence of means of providing for adjustment of altimeters to a nonstandard pressure. For instance, it could be dangerous to fly from regions of high pressure to areas of low pressure without adjustment of the altimeter device (Carrere et al., 2016) . This implies that the aircraft's actual altitude would turn out to be lower than the indicated altitude. The phrase "high to low or hot to cold, look out below" is used to remember the dangerous condition as pilots adjust from an area of low pressure to areas of high pressure without any alteration to the altimeter. The real aircraft attitude is high than the indicated altitude. There are several procedures that should be put in place to reduce altimeter errors related to weather during flight preparation. Many altimeter devices are subject to elastic, mechanical, and temperature errors. These errors need to be checked before the flight.
References
Bo, L., Chao, X., Xiaohui, L., & Wenli, W. (2017, October). Research and experimental validation of the method for barometric altimeter aid GPS in challenged environment. In 2017 13th IEEE International Conference on Electronic Measurement & Instruments (ICEMI) (pp. 88-92). IEEE.
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Carrere, L., Faugère, Y., & Ablain, M. (2016). Major improvement of altimetry sea level estimations using pressure-derived corrections based on ERA-Interim atmospheric reanalysis. Ocean Science , 12 (3), 825-842.
