One major setback came during the final stages of testing when, on 14 January 1996, the package was put through its final vibration test and its casing cracked.

Dynamic modulus is the ratio of stress to strain under vibratory conditions (calculated from data obtained from either free or forced vibration tests, in shear, compression, or elongation).

These vibration tests can be performed in cryogenic conditions, which is required for infrared mission equipments which are cooled before launch (ISO, Herschel).

Random in the high-frequency response range (20 to 2000 Hz) The goals of vibration tests are:

Evaluation of operation with a vehicle interface may require compatibility evaluation with a vibration test.

"We completed the vibration tests without structural failure, satisfying requirements for safety and operational use," said Bill Adams, an aerospace engineer in charge of the work.

Common practice in the automotive industry is the use of accelerated vibration tests.

Two typical types of vibration tests performed are random- and sine test.

Production vehicles are given visual inspections for flaws, individually test-driven at high speeds, and subjected to vibration tests.

Powerplant failure of the type that afflicted the LOT aircraft was extremely rare because bearing wear is generally identified by vibration tests during maintenance.