Ariane

A Floating Point Error That Caused A Damage Worth Half A Billion

A Floating Point Error That Caused A Damage Worth Half A Billion
  1. What is the cause of Ariane 5 rocket launch error?
  2. What is the main problem in the maiden flight Ariane 5 explosion?
  3. What was wrong with Ariane 5?
  4. What are the problems in Ariane 5 software development?
  5. How reliable is the Ariane 5 rocket?
  6. What was the problem with the O rings in launch?
  7. How many tests were needed for the engine that powered the first stage of Ariane 5?
  8. Where is the Ariane 5 built?
  9. Where is Ariane 5 manufactured?

What is the cause of Ariane 5 rocket launch error?

The story of Ariane 5:

The failure of the Ariane 501 was caused by the complete loss of guidance and attitude information 37 seconds after start of the main engine ignition sequence (30 seconds after lift-off).

What is the main problem in the maiden flight Ariane 5 explosion?

It turned out that the cause of the failure was a software error in the inertial reference system. Specifically a 64 bit floating point number relating to the horizontal velocity of the rocket with respect to the platform was converted to a 16 bit signed integer.

What was wrong with Ariane 5?

On 4 June 1996 the maiden flight of the Ariane 5 launcher ended in a failure. Only about 40 seconds after initiation of the flight sequence, at an altitude of about 3700 m, the launcher veered off its flight path, broke up and exploded.

What are the problems in Ariane 5 software development?

Launcher failure  Approximately 37 seconds after a successful lift-off, the Ariane 5 launcher lost control.  Incorrect control signals were sent to the engines and these swivelled so that unsustainable stresses were imposed on the rocket.  It started to break up and was destroyed by ground controllers.

How reliable is the Ariane 5 rocket?

The original version is dubbed Ariane 5 G (Generic) and had a launch mass of 737 tonnes. Its payload capability to geostationary transfer orbit (GTO) was 6,900 kg (15,200 lb) for a single satellite or 6,100 kg (13,400 lb) for dual launches. It flew 17 times with one failure and two partial failures.

What was the problem with the O rings in launch?

An O-ring seal had failed at launch, but the hole was quickly resealed by aluminum oxides before any flames could escape and cause an explosion. Strong wind shear that began 37 seconds into flight then tore the seal back open, resulting in the catastrophic breakup.

How many tests were needed for the engine that powered the first stage of Ariane 5?

Ariane 5's ground testing was completed after a series of six hot firing tests of the launcher's core cryogenic stage, which ran from June 1995 to January 1996 in French Guiana.

Where is the Ariane 5 built?

Ariane 5 rockets are manufactured partly in Europe and partly in French Guiana. The European pieces are shipped to Kourou where the launcher is assembled with the locally manufactured elements.

Where is Ariane 5 manufactured?

Approximately 30% of Ariane-5 facilities were built in Europe and 70% in French Guiana. Approximately one billion ECU (European Currency Units) have been invested in the ground facilities, representing 20% of the total cost of the Ariane-5 development programme.

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