srai wrote:These things are proven with a static stress specimen. LCA has had a stress airframe and testing that for a long time now. Look at any LCA brochure and you will see it.
Watch about 2 minutes from the point linked below. Two scenes even show an R-60 mounted on a LCA wing and being put through tests. I am sure the same tests were later repeated with the R-73 or whatever and I am guessing the wings stood up well. My guess that ishttps://youtu.be/755G4aqQ9mk?t=406
FYI, the particular test they showed with R60 on is called Structural Coupling Test (The narrator mentions it in the list of test facilities he spell out). Its done to find out the frequency response of various airframe components so that those frequencies can be eliminated from the FCS's response using filters (basically FCS will ignore those vibratory motions) to avoid resonance or any other such issues.
Here is a paper from LCA team which nicely describes this.
It seems there are three main structural tests for LCA involving entire Airframe:
- MAST (Main Airframe Static Test)
- MAFT (Main Airframe Fatigue Test)
- SCT (Structural Coupling Test)
From this video we see that they have done SCT on the TD airframe in early 2000s for sure, and may be MAST/MAFT too. And from Broadsword blog, it is clear that these tests are repeated on early LSP series (Picture posted by srai above). Its not too much of a stretch of imagination to think that these must have been again repeated with late LSPs which are very close to production standard.
They must have done Design load tests but I highly doubt the Ultimate load test is done so far. I think its still pending.
PS: http://ajaishukla.blogspot.in/2008/03/h ... -test.html