Factual Information 2015:1.11 Flight Recorders/1.11.2
This page contains an extract from MH370/01/15 Factual Information which accompanied the (first) Interim Statement released by The Malaysian ICAO Annex 13 Safety Investigation Team for MH370 on 8th March 2015.
1.11.2 Solid State Cockpit Voice Recorder (SSCVR)
The solid state cockpit voice recorder is in the Electronic Equipment Rack, E7, in the aft cabin above the ceiling and located adjacent to the SSFDR (Figure 1.11B below).
The solid state cockpit voice recorder (SSCVR) has a recording capacity of at least two hours in standard quality and thirty minutes in high quality. The voice recorder system receives flight deck sounds and flight crew communications. It keeps this audio in a solid state memory.
Four audio channels go to the SSCVR. Channel 1, 2, and 3 audio is from the audio management unit (AMU). Each channel carries audio from one crew member’s flight interphone audio. The audio on each channel is the sum of these signals:
- Hot mic audio (microphone audio when there is no press-to-talk [PTT])
- Received audio as selected on the crew member’s audio control panel (ACP)
- Side tone audio to the crew member
Channel 4 audio is from the Cockpit Area Microphone (CAM). The CAM sends flight deck area audio to the SSCVR.
The SSCVR operates any time power is available on the Left AC transfer bus. This bus is not powered from batteries or the Ram Air Turbine (RAT).
Details of the SSCVR installed and the specifications are as follows:
- Manufacturer: Honeywell
- Model: SSCVR Model 6022
- Part Number (P/N): 980-6022-001
- Serial Number (S/N): 2677
- Date last installed on aircraft: 26 August 2012
- Weight: 5.9 kg
- Electricity Consumption: 8 W, 115 VAC 400 Hz
- Impact Shock: 3400 G for 6.5 ms
- Fire Temperature: Max 1100°C (30 min)
- Deep Sea Pressure and Sea Water Immersion: 20,000 ft.
Source: Malaysian ICAO Annex 13 Safety Investigation Team for MH370, 8 March 2015, Factual Information MH370/01/15
The Factual Information was updated in 2018 by the Safety Investigation Report MH370/01/2018 which added new content but did not include all of the previous data.