Additional Information
By the end of 1970-ies f-4J fighters were in service for almost ten years, which affected. To extend the service life, in 1975, a modernization program was launched, similar to the previous program "Bee Line", during which 288 f-4B aircraft underwent major repairs and re-equipment in the f-4N version. The main objective of the programme was to extend the life of the F-4J until it was replaced by the F/A-18 and F-14. All was upgraded 265 (according to some sources 248) aircraft that received the designation F-4S.
the Main changes affected the power elements of the structure and chassis. In the aviation center of the US Navy in San Diego aircraft underwent major repairs. The power elements of the wings and fuselage, as well as the landing gear carefully examined and where necessary, strengthened. The wiring of the on-Board network was completely replaced, and stainless steel pipelines were installed in the hydraulic system.
In order to increase maneuverability, two-position slats were installed, which provided an improvement in aerobatic performance up to 50% compared to the F-4J. Slats were produced automatically, depending on the angle of attack, as was provided manual control. The slats were made two-section: one part was located on the fixed part of the wing, and the other on the folding. Of some technical difficulties, the slats were not installed on the first 43 F-4S, but later, and these machines were completed.
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