The Challenger Disaster PowerPoint Presentation

                                

Risk Management

• The art and science of identifying, analyzing, and responding to risk

The Challenger Mission 51L

• 10th mission for the Challenger Shuttle
• TISP – Teachers In Space Program
• Christa McAuliffe
• Politically Charged Launch
• Christa was to appear via television link during Reagan’s State of the Union Address in 1986

Challenger Delays

• Liftoff Initially Scheduled for 15:43 EST on Jan. 22, 1986
• Delays in 61-C mission pushed liftoff to Jan. 23, then Jan. 24
• Reset to Jan. 25 due to weather
• Postponed another day due to launch processing problems
• Rescheduled for 9:37 EST Jan. 27 due to weather
• Delayed again due to equipment failure for 24 hours
• Final 2 hour delay due to hardware interface module problems

The Challenger Disaster

73 Seconds After Liftoff

What Went Wrong??

Failure of an “O-ring” seal in the solid-fuel rocket on the Space Shuttle Challenger's right side 

Flames cut into main liquid fuel tank

Four Main Causes of O-Ring Failure

1. Pre-flight Leak Tests
2. O-Ring Erosions
3. Joint Rotation
4. Low Temperatures

Poor Risk Management

• Risks were managed using Critical Items Lists
• Criticality 1-Loss of Life or Ship
• Criticality 2-Mission Aborted
• CIL Flaws
• Unreliable
• In previous missions, criticality1 issues occurred but loss of life/ship did not
• Negotiable
• Identified risks could later be waived

Known Potential Problems

O-rings were “Criticality 1” feature

O-ring seal failure on previous missions

Launch Constraint placed on subsequent launches

These constraints had been imposed and regularly waived by the SRB Project Manager

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