CVR: – Cockpit Voice Recorder
The Federal Aviation Administration (FAA) has directed the larger commercial aircraft and some smaller commercial, corporate, and private aircraft to be equipped with two “black boxes” that record information about a flight. One of these the Cockpit Voice Recorder (CVR), records sounds in the cockpit and radio transmissions, for example the pilot’s voices and engine noises. Meanwhile, the Flight Data Recorder (FDR), monitors parameters such as airspeed, altitude and heading. In case of an aircraft accident, both the recorders installed helps to reconstruct the events leading to the accident and are usually installed in the most crash survivable part of the aircraft, the tail section. The newer ones use digital technology and memory chips while the older analog units used one-quarter inch magnetic tape as a storage medium.
The “cockpit area microphone” of the CVR recorder is usually positioned on the overhead instrument panel between the two pilots. The examiner usually checks CVR for the stall warnings, engine noise, landing gear extension and retraction, and Communications with Air Traffic Control. The recording of automated radio weather briefings, conversation between the pilots and cabin crew, conversation with the base station are also investigated in caes of accidents. A CVR committee which is formed to listen the recording usually consist of members from the FAA, NTSB, and the pilots union, manufacturer of the airplane, operator of the aircraft, manufacturer of the engines.