MIL-PRF-39015/3L, PERFORMANCE SPECIFICATION, RESISTORS, VARIABLE, WIRE-WOUND (LEAD-SCREW ACTUATED), NONESTABLISHED RELIABILITY, AND ESTABLISHED RELIABILITY STYLE RTR24 (19 MAY 1997)., This specification covers the associated requirements for style RTR 24, lead-screw actuated, wire-wound, variable resistors. Available in a +/- 5 percent resistance tolerance and terminal types L, P, W, and X.