What damage could my payload do to an airliner?

Thankfully there are no recorded cases of aircraft being hit by high altitude balloons but the risk is there. A recent bird strike on an Egypt Air airlines 737 does how what damage could be done.

http://www.independent.co.uk/news/uk/home-news/bird-hits-passenger-jet-landing-at-heathrow-leaving-a-large-bloody-dent-on-its-nose-a6928781.html

Bird hits passenger jet landing at Heathrow leaving a large bloody dent on its nose Matt Payton

The plane remained grounded for 21 hours until a replacement was found.
  • egypt-air-bird-dent-egyptair-heathrow-1.jpg

A bird has struck a passenger jet leaving a large dent in its nose as it was coming in to land at Heathrow.

The EgyptAir flight from Cairo was grounded for 21 hours after the incident before a replacement nose could be located.

 

Pictures of the damage show a large exposed dent in the Boeing 737-800 complete with blood and feathers.

The aircraft, which had 71 passengers on board, managed to safely land at the airport on Friday, reports the Aviation Herald.

Amir Hashim, a Senior Procurement Specialist for Egyptair, posted these images on to Facebook.

Mr Hashim wrote alongside the photographs:”SU-GDZ operating yesterday evening’s MS779 arrival suffered a bird strike on approach.

“The damage caused is clearly evident and SU-GDZ will be grounded until a new radome is fitted. Now, who has a spare?”

egyptair-bird-strike-damage-heathrow-2.jpg
These photos were uploaded onto Facebook by the airline’s Senior Procurement Specialist
Another way to look at the issue is to take the focus off individual cases and look at the wider picture. This recent article from the BBC web site does just that.
Source Small drone risks to aircraft minimal http://www.bbc.co.uk/news/technology-33008257
Turkey vulture

The risk of a small, consumer drone significantly damaging an aircraft is ‘minimal’, suggests a study.

It used data on bird strikes to get a sense of what would happen if a small drone collided with a plane.

Only 3% of collisions between aircraft and birds similar in weight to domestic drones result in damage, found the George Mason University researchers.

An even smaller number caused injuries to humans, it found, and many of these were caused by flocks of birds.

No fatalities

The research project was prompted by the recent introduction of rules in the US that make owners of drones weighing more than 250g register their craft with the US Federal Aviation Administration (FAA).

“Contrary to sensational media headlines, the skies are crowded not by drones, but by fowl,” wrote Eli Dourado and Samuel Hammond in an article summarising their research.

US airspace is home to about 10 billion birds, said the researchers, but collisions between fowl and aircraft have remained rare.

The pair analysed 25 years of data gathered by the FAA on bird strikes to determine what damage a drone might do.

Of the 160,000 bird strikes recorded since 1990, 14,314 caused damage, revealed the analysis. About 80% of the damage was done by birds such as turkey vultures and geese, which significantly outweigh domestic drones.

About 97% of the strikes that involved small birds did no damage to the aircraft they hit, said the researchers.

“Given the voluntary nature of strike reporting, the true percentage of strikes causing damage is probably much lower, as strikes that do not cause damage can be either missed or under-reported,” they wrote.

The researchers did point out that because birds and drones are made of different materials, more damage might occur if a drone hits a plane. It urged the FAA to carry out research to determine the likely damage.

While there have been wildlife strikes that did cause fatalities, none involved a bird that was similar in size to a domestic drone, they said.

If drones collided with planes in the same proportion as birds do – roughly one bird in one million – then it could be a long time before any drone-aircraft impact does damage, they said.

“One damaging incident will occur no more than every 1.87 million years of 2kg [drone] flight time,” said the researchers. Fatal incidents will be even rarer.

“This appears to be an acceptable risk to the airspace,” they concluded.

 

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