Stall Warning Flight Test Turns Disastrous - Episode 216
ฝัง
- เผยแพร่เมื่อ 28 ส.ค. 2024
- A Beech Hawker 900XP jet crashed while doing a flight test of a stall warning system. Special guest Miles O'Brien joins Todd Curtis and John Goglia deconstruct the February 2024 aviation incident.
The accident occurred during a positioning flight that happened after completion of maintenance of the anti-icing component on the leading edge of the wing. The flight crew was performing a required test of the stall warning system. The aircraft lost control and crashed about 11 minutes after takeoff.
Stall tests are often done early in a flight so the crew can easily return to the maintenance facility if an issue is found. However, this crew did not follow standard procedures.
The crew took risks during the flight test, including flying over high terrain with limited visibility due to overcast conditions. The stall characteristics were more intense than what most pilots would experience in a small training aircraft.
This accident is compared to two earlier events. In 1979, a 727 crew had a loss of effectiveness of the flight control system and were barely able to recover the aircraft after a spiral dive and rapid loss of altitude. In the other event, a DC8 crew crashed while conducting a stall test after the aircraft had completed an extensive overhaul and modifications.
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Music: “Inspirational Sports” license ASLC-22B89B29-052322DDB8
Hawker pilot here. A couple observations:
In the procedures for this test, point 5 stipulates that the test go to the pusher then recover to normal flight. The pusher should activate prior to a stall…that’s the purpose of the pusher, to forcefully reduce aoa prior to a stall.
The purpose of this test (and similar tests on other types) is to ensure the wing/leading edge was reinstalled at the correct angle/position. This is verified by the shaker and pusher activating at the appropriately calibrated aoa.
I’d also point out that in the Lears, these tests are REQUIRED to be performed by a manufacturer test pilot. Not something to be taken lightly.
Great addition to have Miles Obrien on the team. I always enjoyed his aviation and space shuttle analysis on CNN. 👍
Add Dan Gryder!!!
@@vr6jettar Yah. I'd be down for that. Love me some Gryder!
No. Add Gryder, and I stop watching.
@@calburnIII Aw..cant stand hearing different opinions? Go ahead and stay in that echo chamber of yours. Growth comes from being uncomfortable. Sometimes we need to hear differing opinions to open our eyes to something. Do I approve of everything Dan Gryder does, no, however, his message of safety and staying alive in your airplane is vitally important and should be heard on every platform possible.
I’ve done 5 or 6 of these test without a problem. Would like to see this test eliminated.
Great discussion gentleman …..currency is SO important
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Maybe the manufacturer’s rules should dictate that the chief mechanic or engineer that did the work goes up with them for the test. Would the CEO be willing to go up for that test?
Test must be done in accordance to maintenance manual. There is required weather for test. Airframe must be clean of contamination.
There is no ground check equivalent?
Hard to simulate a stall on the ground. If you're testing something that is trying to prevent a stall, you need to be able to make it think there's a stall developing. That means fooling at least two different sensor types, and depending on the plane likely multiple locations of both sensor types. That's now talking a good-sized test rig and likely at least 3 technicians/mechanics. Compare that to the cost of simply flying the bird with two pilots with a specific qualification, on a test flight that probably needs to be done anyways.
@@erichusmann5145 Understood, but if you are a specialty shop it would be cheaper in the long run than hiring specialty crews and risking crashing the plane.
I remember watching the 'How it's made' on a Gulfstream. The stall test is by far the scariest thing I've seen done with a business jet, the pilot was sawing so hard with the stick that he could've started a fire.
Motor Home going over a cliff under the best of circumstances. Humbling