Factual Information 2015:1.11 Flight Recorders/1.11.3
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.
1.11.3 Underwater Locator Beacons (ULB)
Both crash-protected recorders were equipped as provided by the regulations with underwater locator beacons (ULB) whose transmission time is at least 30 days, on the 37.5 kHz frequency, operating depth up to 20,000 ft. (6096 m) and activated with fresh or salt water immersion. Detail specifications are as per below:
- Manufacturer: Dukane
- Model: DK-100 / DK-120
- Operating Frequency: 37.5 kHz ± 1 kHz
- Operating Depth: Surface to 20,000 ft. (6,096 meters)
- Pulse Length: 10 milliseconds + 10%
- Pulse Repetition Rate: Not less than 0.9 Pulse/Sec
- Operating Life: 30 days (minimum)
- Battery Life In Beacon: 6 Years
- Acoustic Output, Initial: 1060 dynes/cm² rms pressure at 1 meter (160.5 dB)
- Acoustic Output After 30 Days: 700 dynes/cm² rms pressure at 1 meter (157.0 dB)
- Operating Temperature Range: +28°F (-2.2°C) to +100°F (+37.8°C)
- Actuation: Fresh or salt water
- Radiation Pattern: Rated output over 80 percent of sphere
- Size: 1.30 inches (3.30 cm) diameter x 3.92 inches (9.95 cm) long (less mount)
- Weight, Beacon: 6.7 ounces (190 grams)
- Storage Temperature Range: -65°F (-54°C) to 160°F (71°C)
The SSFDR was attached with a ULB as below:
- S/N: SC26210
- ULB Expiry Date: December 2012
The SSCVR was attached with ULB as below:
- S/N: Not Recorded
- ULB Expiry Date: June 2014
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.