Method for evaluating takeoff operation airworthiness of ultrahigh altitude civil airport
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An airworthiness and airport technology, which is applied in the field of airworthiness evaluation for take-off and operation of ultra-high altitude civil airports, can solve problems such as unairworthiness and unsuitability for building airports, and achieve the effect of improving safety
Inactive Publication Date: 2022-03-04
CHINA ACAD OF CIVIL AVIATION SCI & TECH
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Since the aircraft certification altitude of 14,500 feet refers to the barometric altitude, not the altitude, even if the altitude of the airport is slightly less than 14,500 feet, the barometric altitude may exceed the operating envelope under certain conditions, so even if the altitude is slightly less than 14,500 feet There are also situations where it is not airworthy, and of course there are situations where it is not suitable for building an airport.
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Embodiment 1
[0029] Such as figure 1 As shown, an evaluation method for the airworthiness of take-off and operation of an ultra-high altitude civil airport, the method is as follows:
[0030] A. Collect the surface pressure QFE, and calculate the standard field pressure QFE according to the certified altitude a of the aircraft and the altitude z of the airport REF ;
[0031] B. Judgment difference Δ=QFE-QFE REF , if the difference Δ is greater than zero, it is airworthy, otherwise it is not airworthy.
[0032] Standard field pressure QFE in step A REF It is calculated from the corrected sea level pressure QNH and the reference coefficient K, and its calculation formula is as follows:
[0033] QFE REF =QNH / k 5.256 ;
[0034] Among them, the corrected sea level pressure QNH is calculated according to the following formula:
[0035] a=z+145442.15×(1-(QNH / P 0 ) 0.1902631 );
[0036] P in the above formula 0 Be the sea level air pressure under the standard atmospheric condition, in ...
Embodiment 2
[0050] This embodiment is basically the same as the embodiment, the difference being that step A collects the surface air pressure QFE of the proposed ultra-high altitude airport site. During implementation, the surface air pressure QFE is collected at least once every month for at least one year and the number of times is equal to each month, and the surface air pressure QFE is collected at least once in each hour of the current month. The method of collecting the surface air pressure QFE is the same as that in Embodiment 1 The same as Table 1, that is, collect at least once during 0-1 hours in January, collect at least once during 1-2 hours in January, and collect at least once during 2-3 hours in January..., that is, January Collect at least once every full hour from 1 to 24 o'clock. By analogy, at least one time is collected in every hour corresponding to 1-24 o'clock in February-December.
[0051] In this embodiment, a proposed airport whose altitude is also 4500m, that ...
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Abstract
The invention discloses a method for evaluating takeoff operation seaworthiness of an ultrahigh-altitude civil airport, which comprises the following steps of: A, acquiring scene pressure QFE, and calculating standard scene pressure QFEREF according to an approved height a of an aircraft and an airport elevation z; and B, judging that the difference value delta is equal to QFE-QFEREF, if the difference value delta is greater than zero, the airworthiness is realized, and otherwise, the airworthiness is not realized. According to the method, the parameter QFEREF is introduced as a reference, and the scene air pressure QFE collected in real time is compared with the reference, so that the airworthiness of the aircraft in the take-off operation of the ultrahigh-altitude civil airport is judged, the situation that an airport site with the altitude slightly higher than 4420 m but good clearance conditions is missed due to a one-step site selection mode is avoided, and the airport site selection accuracy is improved. And an effective judgment can be made on the condition that the built airport with the altitude slightly smaller than 14500 feet is not airworthiness due to low air pressure height in special weather, so that the running safety of the aircraft is improved.
Description
technical field [0001] The invention relates to an evaluation method for the airworthiness of take-off operation of an airport, in particular to an evaluation method for the airworthiness of take-off operation of an ultra-high altitude civil airport. Background technique [0002] The number and construction scale of airports in the western region of my country are smaller than those in the eastern region, due to unfavorable factors such as large terrain fluctuations, low air density, low oxygen concentration, low ambient temperature, poor clearance conditions, and rapid weather changes. Most of the aircraft operating at ultra-high-altitude airports use Boeing B737 series and Airbus A319 series. The commonality of these two models is that the certified altitude is 14,500 feet (4420 meters). meters, the two aircraft cannot operate. Therefore, the location of the airport is limited to areas with an altitude of 4,420 meters and below, and for areas above 4,420 meters, a "one si...
Claims
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