Report of the PRESIDENTIAL COMMISSION
on the Space Shuttle Challenger Accident
Volume 5 Index
Hearings of the Presidential
Commission on the Space Shuttle Challenger Accident: February 26,
1986 to May 2, 1986.
MARCH 7, 1986 SESSION (part 2 of
2)
[1185] [Ref. 3/7-61]
Preliminary STS 51-L Anomaly List.
PRELIMINARY STS 51-L
ANOMALY LIST
PRELIMINARY
CATEGORY A
- BLACK SMOKE AT 0.533 SEC.
- HOT GAS LEAK 9 RH SRM AT OR NEAR AFT FIELD
JOINT AT APPROXIMATELY 58 SECONDS
- RH SRM Pc DIVERGENCE AT 60
SECONDS
- DECREASED H2 TANK PRESSURE
RISE RATE AT 66.8 SECONDS
- YAW RATE DIVERGENCE AT APPROXIMATELY 72
SECONDS
- H2 TANK PRESSURE DECREASE WITH TWO FLOW
CONTROL VALVES OPEN AT
- APPROXIMATELY 72 SECONDS
- SRB MOTOR HIGH-RATE ACTUATOR COMMAND AT
APPROXIMATELY 72.6 SECONDS
- SHARP DECREASE IN ENGINE PUMP INLET
PRESSURES AT APPROXIMATELY 73 SECONDS
- RH SRM PRESSURE 19 PSI. BELOW LH SRM (4.9
SIGMA LOW) AT APPROXIMATELY 73 SECONDS
- INITIATION OF EXTERNAL TANK STRUCTURAL
FAILURE AT APPROXIMATELY 73 SECONDS
CATEGORY B
- POTENTIAL FOR WATER IN THE JOINT
- LOW TEMPS AT LAUNCH
- DIMENSIONS AT STACKING COULD RESULT IN
METAL-TO-METAL CONTACT/0-RING DAMAGE
- SUSPECT DEFECTIVE SECONDARY O-RING AT RH
SRM AFT FIELD JOINT
- SPECIAL INSPECTION OF IN STOCK O-RINGS
REVEALED DISCREPANCIES
- CHANGE IN O-RING INSPECTION CRITERIA
OMITTED GOVERNMENT MANDATORY INSPECTION POINTS
- FLAW IN EXTERNAL TANK WELD
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