Dozens of people have survived a crash involving a plane carrying 69 people in Kazakhstan, local officials say.
Kazakh authorities said 38 people were killed in the crash.
Azerbaijan Airlines flight J2-8243 caught fire as it attempted to make an emergency landing near the Kazakh city of Aktau.
The plane was en route to Grozny in Russia but it was diverted due to fog, the airline told the BBC.
Footage shows the aircraft heading towards the ground at high speed with its landing gear down, before bursting into flames as it lands.
The airline said the plane “made an emergency landing” about 3km (1.9 miles) from Aktau.
It took off from the Azerbaijani capital Baku at 03:55 GMT on Wednesday, and crashed around 06:28, data from flight-tracking website Flightradar24 showed.
Unconfirmed reports from Russian media said the aircraft might have collided with a flock of birds before crashing.
Azerbaijan Airlines said flights between Baku and the Russian cities of Grozny and Makhachkala would be cancelled while an investigation into the incident was completed.
Officials said the plane’s black box flight recorder had been recovered.
Those on board were mostly Azerbaijani nationals, but there were also some passengers from Russia, Kazakhstan, and Kyrgyzstan.
A woman who was travelling to spend the holidays with her children in Chechnya, of which Grozny is the capital, died in the crash. One mother, travelling with medical tests for her sick child, is still missing.
A young woman shared her heartache with the BBC’s Azerbaijani service as she desperately tried to find out what happened to her father, who was on the flight.
She explained that her father had been travelling with his son, who survived the crash. The son managed to contact his sister, but there was still no news of their father.
Unverified video footage showed survivors crawling out of the wreckage, some with visible injuries.
Both Azerbaijan and Kazakhstan have launched investigations into the incident. Embraer told the BBC it was “ready to assist all relevant authorities”.
The BBC has contacted Azerbaijan Airlines for comment.
Embraer, a Brazilian manufacturer, is a smaller rival to Boeing and Airbus, and has a strong safety record.
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Employing the Balanset-1A System
Preparing the Necessary Tools
accelerometers, laser rpm sensor, mounting stand, software application, and additional tools.
Connect the device to your PC using the USB interface and confirm the software installation.
Setting Up the Sensors
Fix the accelerometers securely to the machine’s structure in locations where vibrations are most prominent, ideally near the bearings.
Direct the laser speed sensor towards the rotor and affix reflective tape to the rotor surface to facilitate phase angle measurement.
Starting the Program
Launch the Balanset software on your computer.
Select the appropriate balancing mode: single-plane or two-plane, depending on the rotor type and your specific requirements.
Measuring Initial Vibration
Operate the rotor at its intended working speed.
The application will acquire data on vibration magnitude, rotational velocity, and phase angle to determine the initial imbalance state.
Mounting the Test Weight
Halt the rotation and mount a test weight at a designated position on the rotor, with the weight’s value entered into the software (usually in grams).
Restart the rotor, and the software will record the changes in vibration level and phase angle.
Determining the Corrective Mass
Based on the measured data, the software automatically calculates the correction weight parameters: mass and installation angle.
The results of the calculation are shown both numerically and visually through charts and graphs.
Mounting the Compensating Weight
Mount the calculated corrective weight onto the rotor at the specified location and angle.
Periodic checks can be performed to ensure the balancing procedure is effectively reducing the vibration.
Final Check and Balance Confirmation
After installing the correction weight, run the rotor again and check the residual vibration level.
If the measured vibration falls within the tolerance defined by ISO 1940, the balancing process is considered successful.
Should the vibration still be excessive, repeat the balancing steps, making further adjustments to the corrective weight as needed.
Generating a Documentation of the Balancing Results
All balancing results are logged and archived within the software, from which you can produce a printable report summarizing the vibration levels, compensating weight, and its installation position.
Concluding Steps and Verification
Ensure all applied weights and attached sensors are firmly fixed in their designated positions.
Confirm that the rotor spins freely and quietly, without any unusual sounds or vibrations.
If the rotor is part of a complex mechanism, verify the proper interaction of all its components.
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