Which of the following statements with regard to Black Boxes in modern aircraft is/are correct? 1. T

Question

Which of the following statements with regard to Black Boxes in modern aircraft is/are correct? 1. They carry a beacon emitting red light pulses for underwater detection. 2. They record both cockpit voice and flight data. 3. Their memory units are made using either stainless steel or titanium.

Accepted Answer

Statement 1 is incorrect — black boxes have an Underwater Locator Beacon (ULB) that emits acoustic (ultrasonic) pulses at 37.5 kHz, not light pulses. Statement 2 is correct — "black box" collectively refers to the Cockpit Voice Recorder (CVR) and Flight Data Recorder (FDR). Statement 3 is correct — the Crash-Survivable Memory Unit (CSMU) outer armor is made of stainless steel or titanium with thermal insulation, surviving up to 3,400 Gs and 1,100°C.