16
$\begingroup$

Delta 1889 was forced to make an emergency landing last Friday (August 7th, 2015) after being battered by hail in a severe thunderstorm.

The picture in the news shows the two leading segments of the windshield have been ruined and will need to be replaced. The nose cone of the jet has been caved in. Zooming in suggests that the sheet metal ruptured where it made contact with whatever it behind it. If that's the case I'm assuming it's too damaged to just have the dents pulled out and will also need to be replaced.

Beyond the obvious damage, what else will need to be looked at before the plane is able to resume normal operations?

http://extras.mnginteractive.com/live/media/site36/2015/0808/20150808_124604_delta-flight.jpg

$\endgroup$
  • 4
    $\begingroup$ Contrary to some of the media reports that I've seen, the nose isn't made out of metal, sheet or otherwise. The piece that you see that was completely obliterated is the radome which covers the on-board weather radar. It's made out of rather soft material (fiberglass or similar) so that it won't absorb, reflect, or otherwise attenuate the signal from the weather radar. A Delta 747 also had its radome beat up by hail a couple of months ago. $\endgroup$ – reirab Aug 10 '15 at 3:54
  • $\begingroup$ Note that that damaged Delta 747 was moved into retirement 2 years early rather than trying to repair the damage. $\endgroup$ – Johnny Aug 10 '15 at 5:23
  • 1
    $\begingroup$ It's impossible to say without a lot more detail. The damage looks superficial but as Johnny points out, a 747 was retired with damage that looks from the photo, even more superficial. $\endgroup$ – Simon Aug 10 '15 at 6:53
  • $\begingroup$ @Simon In an airplane, just because it's superficial doesn't mean it's cheap. :( Even in a small turboprop, the windshield and radome can be hundreds of thousands of dollars. $\endgroup$ – reirab Aug 10 '15 at 13:56
  • $\begingroup$ @Johnny Did they confirm that they're retiring it? I saw where they had moved it to the boneyard, but wasn't sure if they were sending it there for repair or retirement (planes are also repaired there frequently.) $\endgroup$ – reirab Aug 10 '15 at 13:57
5
$\begingroup$

They would have to work from the nose back to ensure there was no other damage but the first thing they would look at is the nose its self. As mentioned that cone is not metal as it houses the aircrafts weather radar behind it. Specifically a Honeywell unit like this one. By the looks of it the element was damaged and most likely needs replacing. From there you would come to the forward pressure bulkhead which, considering the damage would need to be closely inspected. Here is a pic of one from a Boeing for reference.

enter image description here

Degraded or improperly fixed bulkheads have lead to issues in the past. While this is happening they will also work on the windshield and check the struts around it for damage. They would also look over all forward facing surfaces, just a guess but they would check the wings leading edges for damage, engines, leading edges of the horizontal and vertical stabilizer as well as whole airframe for possible damage along its axis'. The question of will the plane ever fly again is more a question of cost than mechanical issues. For what its worth just about anything can be fixed, if and airline will fix it mainly depends on if its cheaper to fix or simply buy a new plane.

$\endgroup$
5
$\begingroup$

All forward-facing parts need to be inspected and replaced if they show signs of damage. This includes:

  • The radome, obviously, the surrounding structure and the weather radar below it.
  • The windshields and the surrounding structure.
  • All leading edges and the high-lift devices attached to them. This includes all tail surfaces.
  • The fan blades of the engines, the cowl lips and the central cone. Even though the engines look undamaged superficially, I would suspect that the fan blades have suffered multiple impacts and have developed cracks as a consequence.
  • All instrumentation, antennas and probes which are not flush with the airframe.

To get an aircraft certified for scheduled service after this kind of damage will take several weeks if done properly. It may be flown after a thorough check and quick fixes, not for passenger service, but to transfer it to a better location to repair the damage. You probably wouldn't believe what can be made flightworthy again with the right sort of sticky tape.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.