SPEECH FUNCTIONS OF RADIOTELEPHONY IN AIR GROUND COMMUNICATION

This thesis deals with speech functions of radiotelephony in air ground communication. This study attempts to investigate the speech functions found in the air ground communication when the unusual situation or emergency occur i.e. what types of speech functions are used in air ground communication, why these types used as the way they are and in what context the speech functions is used as the ways they are. The data of the research were taken from actual language in air-ground communication collected from cockpit voice recorder (CVR), recorded in the black box. The findings indicate that there are fourteen types of speech functions used by pilots and controllers in air-ground communication, which consists of: Attribution, Material, Mental, Relation, statement, question, command, offer, answer, acknowledge, accept, compliment, contradiction, disclaimer. The data analysis shows that not all types of speech functions are used by pilots and controllers in air-ground communication. They use primary knower (k1), secondary knower (k2), primary knowers follow up (k1f), secondary knowers follow up (k2f), delayed primary knowers (dk1), delayed primary actor (da1), primary actor (a1), secondary actor (a2), primary actor follow up (a1f), secondary actor follow up (a2f). The reason of the speech function realized by pilots and air traffic controllers in air ground communication are as follow : the pilots dominantly position is a speaker not agent, the pilots was not knowed of the rules about lexicogrammar especially the fourteen systematically speech function, the pilot and air traffic controller use english phraseology prefer than plain language. And the air traffic controller dominantly used question and command becaused of the following; the controllers dominantly position as the listener or hearer in the interaction, the controllers need the information in the interaction via seeking their partner’s input or opinion, clarifying or confirming their partner’s communication including correcting erroneous information, the controllers has not discourses of knowledge especially the roles of speech function in the communication. The pilot or controller use speech function to accurately reflect their point of view and express the emotion and this can be achieved wth reference to social context in terms of context of situation, context of culture, and context of ideology.