Abstract: The arrangement of the measuring strain gages is the basis of obtaining load spectrum. However, the structure of landing gear is complicated and the available space for gluing strain gages is limited. To solve this problem, the typical locations are given, which can offer important references for other landing gears. According to the load-time history of landing gear, the typical segments are divided by mechanical characteristics of landing gear and the load spectra of different segments are compiled. For some landing gears, they often jump off the ground after the first landing impact and the maximal load of flight direction occurs during the second landing impact occasionally. Therefore, a new and efficient compilation method of landing impact segment is put forward. By changing the sequence of landing impact of load-time history, the analy-sis during landing impact and relations between different direction loads are easily studied, and the damage caused by the load remains the same, which shows that the efficiency of compilation of load spectrum is greatly improved.

Key words: landing gear, load-time history, compilation of load spectrum, landing impact, strain gages