Planes operating in desert climates ingest up to 10kg of dust per 1,000 flights, contributing to disrupted airflow and overheating, resulting in accelerated engine wear, a study has found.
Most dust is ingested by planes while they are circling to land, according to a new global study, which found the largest amounts were at airports close to the Sahara, the Middle East and northern India.
Levels are higher when planes perform holding patterns, with the greatest quantities consumed at low altitudes of 1km, where peak dust concentrations often occur.
To study the effects, scientists examined 17 years of atmospheric and satellite data to calculate the quantity of sand and dust swallowed by jet engines at 10 major international airports: Phoenix, US; Canary Islands, Spain; Marrakesh, Morocco; Niamey, Niger; Dubai; Delhi, India; Beijing, China; Hong Kong; Bangkok, Thailand and Sydney, Australia.
Researchers found summer flights into Delhi topped the list, with an average of 6.6g of dust per arrival in the run up to monsoon season and 4.4g upon departure.
Delhi was followed by Dubai and Niamey, Niger, at 4.3g and 4.7g per arrival respectively, while flights into Beijing consumed 2.9g on average.
Dr Claire Ryder, from the University of Reading and lead author of the study, told The National there was previously a concern among scientists that Sydney and Phoenix were among the worst affected by dust.
“This work shows that really they suffer the occasional large dust storm that probably hits the news but nothing like the regular ingestion that you get in parts of Africa, the Middle East and India, which have really high loads,” she said.
This dust belt, which stretches from west Africa through the Middle East, all the way to the Gobi Desert in China, includes some desert regions, like Dubai, and other locations, such as Beijing, that are not located in desert areas, specifically, but they are frequently affected by the long range transport of dust.
She added: “You get these atmospheric winds that transport dust particles from the desert in certain directions, but it’s dependent on the weather systems and the atmospheric flow.
“For Beijing that is brought by the Gobi desert. For Delhi there are some deserts in north-west India. But Delhi and northern India can also be impacted by Middle Eastern dust.”
Many people will be familiar with the risk of flying through volcanic ash. Sand does not have the same impact. Planes affected by dust are “not going to fall out of the sky”, she said.
“This is really a long-term wear issue,” added Dr Ryder.
“Dust and sand are dangerous to aircraft because dust melts to form glassy deposits on blades or hard mineral crusts inside engines. These crusts disrupt airflow and cause overheating, resulting in accelerated engine wear,” said Dr Ryder.
Although the amount of dust ingested per flight is not huge, she said, it quickly adds up.
“A plane consuming 5g of dust per arrival and departure will eat 10kg of dust over 1,000 flights. Planes will consume more dust when they are at lower altitudes waiting to land, though this depends on the local weather which affect the height of a dust plume in the atmosphere,” Dr Ryder added.
Sand and dust storms hit parts of the Mena region – in pictures
Climate change could potentially lead to a dustier world, she said.
“Climate models do not currently provide a consensus on whether global warming will mean a dustier world, as dust emissions depend on a lot of factors, such as soil moisture, precipitation, surface wind patterns and vegetation cover,” Dr Ryder said.
“Ongoing research at the University of Reading is working to improve the ability of climate models to predict dust emissions and transport through the atmosphere.”
Holding patterns of 10-15 minutes at a 1km altitude can lead to more dust ingestion than during the take-off, climb and taxi phases of a flight, researchers said.
At Delhi airport during summer, holding at a 1km altitude contributes 50 per cent to total dust ingestion, they said. By changing the holding pattern altitude away from the dustiest layers, ingestion could be cut by 41 per cent.
Another option to reduce exposure is to change flight schedules to avoid peak dust times. Moving flights at Delhi and Dubai to night time could reduce engine dust ingestion by more than 30 per cent, researchers said.
FFP EXPLAINED
What is Financial Fair Play?
Introduced in 2011 by Uefa, European football’s governing body, it demands that clubs live within their means. Chiefly, spend within their income and not make substantial losses.
What the rules dictate?
The second phase of its implementation limits losses to €30 million (Dh136m) over three seasons. Extra expenditure is permitted for investment in sustainable areas (youth academies, stadium development, etc). Money provided by owners is not viewed as income. Revenue from “related parties” to those owners is assessed by Uefa's “financial control body” to be sure it is a fair value, or in line with market prices.
What are the penalties?
There are a number of punishments, including fines, a loss of prize money or having to reduce squad size for European competition – as happened to PSG in 2014. There is even the threat of a competition ban, which could in theory lead to PSG’s suspension from the Uefa Champions League.
UAE currency: the story behind the money in your pockets
The%20specs
%3Cp%3E%3Cstrong%3EEngine%3A%20%3C%2Fstrong%3E3.6-litre%2C%20V6%0D%3Cbr%3E%3Cstrong%3ETransmission%3A%20%3C%2Fstrong%3Eeight-speed%20auto%0D%3Cbr%3E%3Cstrong%3EPower%3A%20%3C%2Fstrong%3E285hp%0D%3Cbr%3E%3Cstrong%3ETorque%3A%20%3C%2Fstrong%3E353Nm%0D%3Cbr%3E%3Cstrong%3EPrice%3A%20%3C%2Fstrong%3EDh159%2C900%0D%3Cbr%3E%3Cstrong%3EOn%20sale%3A%20%3C%2Fstrong%3Enow%3C%2Fp%3E%0A
FA%20Cup%20semi-final%20draw
%3Cp%3ECoventry%20City%20v%20Manchester%20United%C2%A0%3C%2Fp%3E%0A%3Cp%3EManchester%20City%20v%20Chelsea%3C%2Fp%3E%0A%3Cp%3E-%20Games%20to%20be%20played%20at%20Wembley%20Stadium%20on%20weekend%20of%20April%2020%2F21.%C2%A0%3C%2Fp%3E%0A
SPEC%20SHEET%3A%20APPLE%20M3%20MACBOOK%20AIR%20(13%22)
%3Cp%3E%3Cstrong%3EProcessor%3A%3C%2Fstrong%3E%20Apple%20M3%2C%208-core%20CPU%2C%20up%20to%2010-core%20CPU%2C%2016-core%20Neural%20Engine%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EDisplay%3A%3C%2Fstrong%3E%2013.6-inch%20Liquid%20Retina%2C%202560%20x%201664%2C%20224ppi%2C%20500%20nits%2C%20True%20Tone%2C%20wide%20colour%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EMemory%3A%3C%2Fstrong%3E%208%2F16%2F24GB%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EStorage%3A%3C%2Fstrong%3E%20256%2F512GB%20%2F%201%2F2TB%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EI%2FO%3A%3C%2Fstrong%3E%20Thunderbolt%203%2FUSB-4%20(2)%2C%203.5mm%20audio%2C%20Touch%20ID%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EConnectivity%3A%3C%2Fstrong%3E%20Wi-Fi%206E%2C%20Bluetooth%205.3%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EBattery%3A%3C%2Fstrong%3E%2052.6Wh%20lithium-polymer%2C%20up%20to%2018%20hours%2C%20MagSafe%20charging%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3ECamera%3A%3C%2Fstrong%3E%201080p%20FaceTime%20HD%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EVideo%3A%3C%2Fstrong%3E%20Support%20for%20Apple%20ProRes%2C%20HDR%20with%20Dolby%20Vision%2C%20HDR10%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EAudio%3A%3C%2Fstrong%3E%204-speaker%20system%2C%20wide%20stereo%2C%20support%20for%20Dolby%20Atmos%2C%20Spatial%20Audio%20and%20dynamic%20head%20tracking%20(with%20AirPods)%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EColours%3A%3C%2Fstrong%3E%20Midnight%2C%20silver%2C%20space%20grey%2C%20starlight%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EIn%20the%20box%3A%3C%2Fstrong%3E%20MacBook%20Air%2C%2030W%2F35W%20dual-port%2F70w%20power%20adapter%2C%20USB-C-to-MagSafe%20cable%2C%202%20Apple%20stickers%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EPrice%3A%3C%2Fstrong%3E%20From%20Dh4%2C599%3C%2Fp%3E%0A
The specs
Engine: 3.9-litre twin-turbo V8
Power: 620hp from 5,750-7,500rpm
Torque: 760Nm from 3,000-5,750rpm
Transmission: Eight-speed dual-clutch auto
On sale: Now
Price: From Dh1.05 million ($286,000)
Benefits of first-time home buyers' scheme
- Priority access to new homes from participating developers
- Discounts on sales price of off-plan units
- Flexible payment plans from developers
- Mortgages with better interest rates, faster approval times and reduced fees
- DLD registration fee can be paid through banks or credit cards at zero interest rates
Specs
Engine: 51.5kW electric motor
Range: 400km
Power: 134bhp
Torque: 175Nm
Price: From Dh98,800
Available: Now
The schedule
December 5 - 23: Shooting competition, Al Dhafra Shooting Club
December 9 - 24: Handicrafts competition, from 4pm until 10pm, Heritage Souq
December 11 - 20: Dates competition, from 4pm
December 12 - 20: Sour milk competition
December 13: Falcon beauty competition
December 14 and 20: Saluki races
December 15: Arabian horse races, from 4pm
December 16 - 19: Falconry competition
December 18: Camel milk competition, from 7.30 - 9.30 am
December 20 and 21: Sheep beauty competition, from 10am
December 22: The best herd of 30 camels
Global state-owned investor ranking by size
1.
|
United States
|
2.
|
China
|
3.
|
UAE
|
4.
|
Japan
|
5
|
Norway
|
6.
|
Canada
|
7.
|
Singapore
|
8.
|
Australia
|
9.
|
Saudi Arabia
|
10.
|
South Korea
|
Tearful appearance
Chancellor Rachel Reeves set markets on edge as she appeared visibly distraught in parliament on Wednesday.
Legislative setbacks for the government have blown a new hole in the budgetary calculations at a time when the deficit is stubbornly large and the economy is struggling to grow.
She appeared with Keir Starmer on Thursday and the pair embraced, but he had failed to give her his backing as she cried a day earlier.
A spokesman said her upset demeanour was due to a personal matter.
Another way to earn air miles
In addition to the Emirates and Etihad programmes, there is the Air Miles Middle East card, which offers members the ability to choose any airline, has no black-out dates and no restrictions on seat availability. Air Miles is linked up to HSBC credit cards and can also be earned through retail partners such as Spinneys, Sharaf DG and The Toy Store.
An Emirates Dubai-London round-trip ticket costs 180,000 miles on the Air Miles website. But customers earn these ‘miles’ at a much faster rate than airline miles. Adidas offers two air miles per Dh1 spent. Air Miles has partnerships with websites as well, so booking.com and agoda.com offer three miles per Dh1 spent.
“If you use your HSBC credit card when shopping at our partners, you are able to earn Air Miles twice which will mean you can get that flight reward faster and for less spend,” says Paul Lacey, the managing director for Europe, Middle East and India for Aimia, which owns and operates Air Miles Middle East.
Key facilities
- Olympic-size swimming pool with a split bulkhead for multi-use configurations, including water polo and 50m/25m training lanes
- Premier League-standard football pitch
- 400m Olympic running track
- NBA-spec basketball court with auditorium
- 600-seat auditorium
- Spaces for historical and cultural exploration
- An elevated football field that doubles as a helipad
- Specialist robotics and science laboratories
- AR and VR-enabled learning centres
- Disruption Lab and Research Centre for developing entrepreneurial skills
AL%20BOOM
%3Cp%20style%3D%22text-align%3Ajustify%3B%22%3E%26nbsp%3B%26nbsp%3B%26nbsp%3BDirector%3AAssad%20Al%20Waslati%26nbsp%3B%3C%2Fp%3E%0A%3Cp%20style%3D%22text-align%3Ajustify%3B%22%3E%0DStarring%3A%20Omar%20Al%20Mulla%2C%20Badr%20Hakami%20and%20Rehab%20Al%20Attar%0D%3Cbr%3E%0D%3Cbr%3EStreaming%20on%3A%20ADtv%0D%3Cbr%3E%0D%3Cbr%3ERating%3A%203.5%2F5%0D%3Cbr%3E%0D%3Cbr%3E%3C%2Fp%3E%0A
UAE currency: the story behind the money in your pockets
UAE central contracts
Full time contracts
Rohan Mustafa, Ahmed Raza, Mohammed Usman, Chirag Suri, Mohammed Boota, Sultan Ahmed, Zahoor Khan, Junaid Siddique, Waheed Ahmed, Zawar Farid
Part time contracts
Aryan Lakra, Ansh Tandon, Karthik Meiyappan, Rahul Bhatia, Alishan Sharafu, CP Rizwaan, Basil Hameed, Matiullah, Fahad Nawaz, Sanchit Sharma
MATCH INFO
Burnley 1 (Brady 89')
Manchester City 4 (Jesus 24', 50', Rodri 68', Mahrez 87')
The fake news generation
288,000 – the number of posts reported as hate speech that were deleted by Facebook globally each month in May and June this year
11% – the number of Americans who said they trusted the news they read on Snapchat as of June 2017, according to Statista. Over a quarter stated that they ‘rarely trusted’ the news they read on social media in general
31% - the number of young people in the US aged between 10 and 18 who said they had shared a news story online in the last six months that they later found out was wrong or inaccurate
63% - percentage of Arab nationals who said they get their news from social media every single day.
Sole survivors
- Cecelia Crocker was on board Northwest Airlines Flight 255 in 1987 when it crashed in Detroit, killing 154 people, including her parents and brother. The plane had hit a light pole on take off
- George Lamson Jr, from Minnesota, was on a Galaxy Airlines flight that crashed in Reno in 1985, killing 68 people. His entire seat was launched out of the plane
- Bahia Bakari, then 12, survived when a Yemenia Airways flight crashed near the Comoros in 2009, killing 152. She was found clinging to wreckage after floating in the ocean for 13 hours.
- Jim Polehinke was the co-pilot and sole survivor of a 2006 Comair flight that crashed in Lexington, Kentucky, killing 49.
More from Rashmee Roshan Lall
How%20to%20avoid%20getting%20scammed
%3Cul%3E%0A%3Cli%3ENever%20click%20on%20links%20provided%20via%20app%20or%20SMS%2C%20even%20if%20they%20seem%20to%20come%20from%20authorised%20senders%20at%20first%20glance%3C%2Fli%3E%0A%3Cli%3EAlways%20double-check%20the%20authenticity%20of%20websites%3C%2Fli%3E%0A%3Cli%3EEnable%20Two-Factor%20Authentication%20(2FA)%20for%20all%20your%20working%20and%20personal%20services%3C%2Fli%3E%0A%3Cli%3EOnly%20use%20official%20links%20published%20by%20the%20respective%20entity%3C%2Fli%3E%0A%3Cli%3EDouble-check%20the%20web%20addresses%20to%20reduce%20exposure%20to%20fake%20sites%20created%20with%20domain%20names%20containing%20spelling%20errors%3C%2Fli%3E%0A%3C%2Ful%3E%0A
UAE currency: the story behind the money in your pockets
SERIE A FIXTURES
Saturday Spezia v Lazio (6pm), Juventus v Torino (9pm), Inter Milan v Bologna (7.45pm)
Sunday Verona v Cagliari (3.30pm), Parma v Benevento, AS Roma v Sassuolo, Udinese v Atalanta (all 6pm), Crotone v Napoli (9pm), Sampdoria v AC Milan (11.45pm)
Monday Fiorentina v Genoa (11.45pm)
Kandahar%20
%3Cp%3E%3Cstrong%3EDirector%3A%3C%2Fstrong%3E%20Ric%20Roman%20Waugh%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EStars%3A%C2%A0%3C%2Fstrong%3EGerard%20Butler%2C%20Navid%20Negahban%2C%20Ali%20Fazal%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3ERating%3A%3C%2Fstrong%3E%202.5%2F5%3C%2Fp%3E%0A
Zayed Sustainability Prize
Specs
Engine: Dual-motor all-wheel-drive electric
Range: Up to 610km
Power: 905hp
Torque: 985Nm
Price: From Dh439,000
Available: Now
England World Cup squad
Eoin Morgan (capt), Moeen Ali, Jofra Archer, Jonny Bairstow, Jos Buttler (wkt), Tom Curran, Liam Dawson, Liam Plunkett, Adil Rashid, Joe Root, Jason Roy, Ben Stokes, James Vince, Chris Woakes, Mark Wood
Global Fungi Facts
• Scientists estimate there could be as many as 3 million fungal species globally
• Only about 160,000 have been officially described leaving around 90% undiscovered
• Fungi account for roughly 90% of Earth's unknown biodiversity
• Forest fungi help tackle climate change, absorbing up to 36% of global fossil fuel emissions annually and storing around 5 billion tonnes of carbon in the planet's topsoil
F1 The Movie
Starring: Brad Pitt, Damson Idris, Kerry Condon, Javier Bardem
Director: Joseph Kosinski
Rating: 4/5