The design and testing of a microprocessor-controlled speech warning system utilized for playing back the warning messages is presented.The system is implemented using hardware circuitry 1nvolvi ng softwar e control. This research is concerned with the development of a new -approach system which is intended as a replacement for an early traditional system called Taped-Message Equipment, which employs magnetic tape and electro-mechanical technologies . The system is designed to Introduce intelligence into the helicopter nstruments to improve safety and reliability during flight. The concepts of adaptive delta modulation (ADM) and microprocessor techniques are applied in system design. An important type of adaptive delta modulation speech coding technique known as Continuously Variable Slope Delta modulation (CVSD) , is used for recording the messages into memory and then playing them back . The system consists of the following three main units : Message-Recording unit. EPROM-Programming unit, and the Message- Playback unit, the circuits of these units have been designed and tested separately and collectively. The system performance is evaluated for various messages by estimating the average short-time power spectral density . and by examining the speech quality by a subjective intelligibility test . The tests reveal encouraging results by comparing the synthetic speech obtained with natural speech.