4 ms·

According to Flightradar24, https://twitter.com/flightradar24/status/1742136715253313938 https://twitter.com/flightradar24/status/1742136715253313938, the Japan

by mrabcx 3y ago

According to Flightradar24, https://twitter.com/flightradar24/status/1742136715253313938 https://twitter.com/flightradar24/status/1742136715253313938, the Japanese coast guard aircraft was not equipped with a ADS-B transponder. Probably because it's not a requirement for military aircraft. That can explain why the ATC and/or JAL was not aware of the exact location of the plane.

Dalewyn 3y ago
Minor nitpick, but the Japan Coast Guard is not a military (and so the concerned aircraft isn't military). It serves under the Ministry of Land, Infrastructure, Transport and Tourism; unlike the JSDF which serves under the Ministry of Defense.
- alistairSH 3y ago
  Curious, what's the rule for USCG and transponders? USCG is part of DHS and considered a military branch (despite not being in DoD alongside the other military branches and having a primarily law-enforcement mission).
  - manquer 3y ago
    Civilian transponders would give away the position of the craft to smugglers and others trying to evade the coast guard. I would expect they would have the ability to switch off their transponders at minimum for missions.
throw0101d 3y ago
It has a transponder, and previous flights for it were recorded: * https://www.flightradar24.com/data/aircraft/ja722a https://www.flightradar24.com/data/aircraft/ja722a * Via: https://twitter.com/flightradar24/status/1742136715253313938 https://twitter.com/flightradar24/status/1742136715253313938 * https://www.planespotters.net/airframe/de-havilland-canada-dhc-8-300-ja722a-japan-coast-guard/34j0y1 https://www.planespotters.net/airframe/de-havilland-canada-d...
- icehawk 3y ago
  It has a mode-s transponder. If you look at, say ADSBExchanbe you can see the signal source is MLAT https://globe.adsbexchange.com/?icao=867bee&lat=36.840&lon=137.104&zoom=8.5&showTrace=2024-01-01 https://globe.adsbexchange.com/?icao=867bee&lat=36.840&lon=1...
rootusrootus 3y ago
I'm most curious about why the JAL plane couldn't see it. An airliner has a pretty bright headlight, and the CG plane should have had lighting on it as well that would distinguish it from the runway lighting. Clearly, as usual, accidents like this require a number of things to all go wrong at the same time.

by mrabcx 3y ago

Dalewyn 3y ago

Minor nitpick, but the Japan Coast Guard is not a military (and so the concerned aircraft isn't military). It serves under the Ministry of Land, Infrastructure, Transport and Tourism; unlike the JSDF which serves under the Ministry of Defense.

alistairSH 3y ago
Curious, what's the rule for USCG and transponders? USCG is part of DHS and considered a military branch (despite not being in DoD alongside the other military branches and having a primarily law-enforcement mission).
- manquer 3y ago
  Civilian transponders would give away the position of the craft to smugglers and others trying to evade the coast guard. I would expect they would have the ability to switch off their transponders at minimum for missions.

throw0101d 3y ago

It has a transponder, and previous flights for it were recorded: * https://www.flightradar24.com/data/aircraft/ja722a https://www.flightradar24.com/data/aircraft/ja722a * Via: https://twitter.com/flightradar24/status/1742136715253313938 https://twitter.com/flightradar24/status/1742136715253313938 * https://www.planespotters.net/airframe/de-havilland-canada-dhc-8-300-ja722a-japan-coast-guard/34j0y1 https://www.planespotters.net/airframe/de-havilland-canada-d...

icehawk 3y ago
It has a mode-s transponder. If you look at, say ADSBExchanbe you can see the signal source is MLAT https://globe.adsbexchange.com/?icao=867bee&lat=36.840&lon=137.104&zoom=8.5&showTrace=2024-01-01 https://globe.adsbexchange.com/?icao=867bee&lat=36.840&lon=1...

rootusrootus 3y ago

I'm most curious about why the JAL plane couldn't see it. An airliner has a pretty bright headlight, and the CG plane should have had lighting on it as well that would distinguish it from the runway lighting. Clearly, as usual, accidents like this require a number of things to all go wrong at the same time.