this video is a must-watch if you’re following the Florida Learjet crash: A meteorologist and pilot wanted to know how is it that a plane equipped with Doppler radar did not see the storm ahead? Turns out that the onboard radar can tilt and if the pilots had tilted it downwards, they would have seen that stronger storm building up. How did they figure this out? They took the actual National Weather Service Doppler radar data from the storm, then recalibrated and resampled it to simulate exactly what a Learjet’s onboard Collins WXR-840 X-band radar (the 3 cm wavelength system many of these jets carry) would have seen at 35,000 feet in −47 °C air. The result is striking. At a normal 0° tilt, the returns look like faint ice-phase echoes. A nothingburger, basically. Tilt the same radar down roughly 5° and it suddenly lights up with the stronger lower core of a rapidly intensifying storm directly ahead. NWS data shows the storm tops were around 31,000 ft just before the jet penetrated, shot up to 40,000 ft while they were in it, then collapsed back to ~33,000 ft after they exited. This confirms that they flew into a storm cloud with explosive growth and collapse with violent updrafts and downdrafts, exactly the kind of thing an X-band radar looking straight ahead at cruise altitude can easily under-sample. @EricBurrisWX walks through the radar geometry, the crystal reflectivity at those temperatures, and low-key gives one of the clearest, most technically grounded explanations out there.

NTSB investigators have recovered the cockpit voice recorder (CVR) of the Learjet 60 that crashed on Nov. 1 near Greenacres, Florida. The CVR was located at the site of initial impact.​ The CVR is being evaluated in the NTSB Vehicle Recorders Laboratory in Washington, D.C. The excavation work at the impact site has been completed.

A potential mid-air collision narrowly avoided at Los Angeles International Airport (LAX) on Saturday, thanks to excellent work by ATC. Air France AF028 (A350-900 F-HUVK), departing runway 24L for Papeete, began turning left. At the same time, American Airlines AA1660 (A321-200), departing runway 25R for Dallas–Fort Worth, also turned left, putting the two aircraft on conflicting flight paths as they climbed out. ATC immediately intervened, issuing instructions to both crews to turn away from each other. The aircraft reportedly came within just 400 feet vertically of one another. You can hear the pressure in the Air France crew's voice as the controller gives them time to collect themselves and correctly read back the instructions before addressing the possible pilot deviation and providing a number to call. Excellent situational awareness from the controller.

術後ちょうど1ヶ月の今日からいつもの一般上級クラスでテニス再開。普通にフォアバックともトップスピンを叩いて問題なかったし、相手にドロップボレーを打たせてからのネットダッシュ→ロブという得意プレーも決まったし、鼠径ヘルニア手術からの回復は事実上100%と言って良さそうだ