RTCA DO 183:1983 Minimum Operational Performance Standards For Emergency Locator Transmitters-Automatic Fixed-Elt (Af), Automatic Portable-Elt (Ap), Automatic Deployable-Elt (Ad), Survival-Elt (S) Operating On 121.5 And 243.0 Megahertz Covers operational goals and applications, and recommends standards and test procedures for emergency locator transmitters.