The paper considers results of test application of the reliability design and technological analysis (RDTA) for the nose fairing pusher of the aerial vehicle. The methodology procedures allow the designer to justify his decisions from the early stages of the life cycle making it possible to timely identify possible causes of the potential failures and take the necessary measures to eliminate or mitigate their consequences. The methodology is intended mainly to analyze the highly responsible unique products; however, it is not yet widely used in the rocket and space technology due to its novelty, and the regulatory framework is missing. To test the methodology, one of the mechanisms for the aerial vehicle one-time response was selected, i. e. the nose fairing pusher, which went through a full cycle of analytical and experimental verification according to the organization standards, and was approved for operation. Despite positive results of the pusher regular testing, the analysis revealed structural elements in it that required measures to improve reliability. An important result of the RDTA application was that the designers did not perceive results of the analysis as criticism, which is typical, for example, when using the FMEA procedures, but regarded them as an integral part of the design work. Despite the received specific recommendations to improve the pusher reliability, it turned out that the RDTA methodology needs further development and improvement for using by a wide range of designers and specialists, and it is also necessary to develop guidelines or standards for application in the standard organization developments.