0.1 Background of the Crash
0.1.1 Weeks after the Learjet 45 carrying Maharashtra Deputy Chief Minister Ajit Pawar and four others crashed on January 28, the Aircraft Accident Investigation Bureau (AAIB) stated that both flight recorders (black boxes) sustained fire damage.
0.1.2 Data has been successfully retrieved from the Digital Flight Data Recorder (DFDR), while the Cockpit Voice Recorder (CVR) is undergoing detailed technical examination.
0.1.3 Due to prolonged exposure to intense heat, foreign technical assistance has been sought for further data retrieval and analysis.

0.2 What Are Black Boxes?
0.2.1 The aircraft flight recorder, commonly known as the black box, has existed in some form since the 1930s.
0.2.2 French engineer Francois Hussenot developed an early version that recorded flight parameters onto photographic film in a light-proof box.
0.2.3 The modern design is credited to Australian jet fuel expert David Ronald de Mey Warren, who created the ARL Flight Memory Unit in 1956.

0.3 The Two Recorders
0.3.1 Aircraft today are equipped with two devices: the Cockpit Voice Recorder (CVR) and the Flight Data Recorder (FDR).
0.3.2 The CVR records radio transmissions, cockpit conversations, crew communications and engine noises.
0.3.3 The FDR records over 80 technical parameters including altitude, airspeed, vertical acceleration and other flight characteristics.

0.4 Role in Crash Investigation
0.4.1 The FDR data enables investigators to reconstruct the flight path through video simulation, analysing altitude, power settings and instrument readings.
0.4.2 This helps visualise the aircraft’s behaviour before impact and identify anomalies.
0.4.3 Typically, it takes 10–15 days to analyse recovered data after a crash.

0.5 Crash Survivability Features
0.5.1 Recorders are housed in units made of strong materials such as steel or titanium and insulated against extreme heat, cold and wetness.
0.5.2 They are placed towards the tail end of the aircraft, which usually sustains the least damage in crashes.
0.5.3 The devices are equipped with a beacon that emits ultrasound signals for 30 days, aiding recovery in water crashes, though in rare cases like Malaysian Airlines MH370, recorders were not found.