China Air plough's through ground equipment at Chicago in Snow

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 An Air China Cargo B-747 ploughed through cargo containers at Chicago Airport on 28th jan 2022, damaging one of her engines. The airport was covered with snow and light snowfall was present when this occurrence took place at nigh around 1600 hrs UTC. METAR text: KORD 281610Z 35008KT 2 1/2SM -SN BKN026 OVC034 M08/M12 A3031 RMK AO2 P0000 T10831117 Conditions at: KORD (CHICAGO O'HARE , IL, US) observed 1610 UTC 28 January 2022 Temperature: -8.3°C (17°F) Dewpoint: -11.7°C (11°F) [RH = 76%] Pressure (altimeter): 30.31 inches Hg (1026.5 mb) Winds: from the N (350 degrees) at 9 MPH (8 knots; 4.1 m/s) Visibility: 2.50 miles (4.02 km) Ceiling: 2600 feet AGL Clouds: broken clouds at 2600 feet AGL overcast cloud deck at 3400 feet AGL Weather: -SN  (light snow) As per media reports there were no injuries to personnel on board or on the ground. Images from social media and Flightradar24 

Qatar Airways avoids potential traffic collision with a crossing aircraft over Iran

 


A Qatar Airways newly acquired Airbus A-350-1000 series aircraft had a close call over Iran on 12th April when it came into close proximity with another crossing aircraft. The airliner equipped with the state of art technology and traffic collision avoidance system was seen climbing by about 500ft while cruising at 34000ft on a flight from Doha, Qatar to Los Angles, USA.

          Flightradar24 plotted aircraft track


The automated TCAS detects an incoming aircraft and if it identifies the other aircraft on a potential collision trajectory, she arms the traffic collision avoidance system. When the intruder crosses a pre-set threshold , the system automatically initiates an avoidance maneuver to provide the minimum safe separation between two aircrafts.




Altitude increase/ Speed decay due to traffic avoidance

In this incident the Qatar Airways A350 registration 97-ANO dropped its speed by almost 35km/hr while cruising at 888km/hr. This drop in speed at an high altitude is not safe since the avoidance maneuver climb is not a rough one but is expected to be as smooth a climb as is carried out during a normal day to day flight as the engines are capable of developing sufficient thrust to maintain the speed.

The possible reasons could be a a sudden climb order "Climb" due to a malfunction in the intruder aircraft's altitude hold capability. In this event, the A350 aircraft's autopilot would increase the load maneuver capability by 0.3g and pull up the nose of the aircraft. The engines are expected to increase the thrust simultaneously to prevent a large speed decay and a potential stall. 

It needs to be investigated if the aircraft performed the evasive maneuver as per the design requirements or was there insufficient engine thrust to back the automatic maneuver. Human factors could also play a part in this event.


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