Report of the PRESIDENTIAL COMMISSION on the Space Shuttle Challenger Accident

 

Volume 4 Index

 

Hearings of the Presidential Commission on the Space Shuttle Challenger Accident: February 6, 1986 to February 25, 1986

 

FEBRUARY 13, 1986 SESSION. [Part 1 of 2]

 

[450] [Ref.2/13-6 1 of 4] STS 51-L ASCENT TIMELINE.

(AS OF 2/12/86)

 

REMARKS

L-6.6 SECs

SSME START CMD

NOMINAL

- 0.0 (11:38:00.010 EST)

SRB IGNITION CMD

NOMINAL

+ 0.0587

FIRST MOVEMENT

NOMINAL

0.445

FIRST EVIDENCE OF BLACK SMOKE - RH SRB NEAR FIELD JOINT

CAMERA 60

1.606

BLACK SMOKE DARKEST

CAMERA 6O

2.147

BLACK SMOKE EXTENDS HALFWAY ACROSS RH SRB

CAMERA 60

7.724

ROLL MANEUVER INITIATION

NOMINAL

[approx.]12-13

LAST VISUAL INDICATION OF BLACK SMOKE

CAMERA 217

20.084

START SSME THROTTLE DOWN TO 94%

NOMINAL

21.124

ROLL MANEUVER COMPLETED

NOMINAL

36.084

START SSME THROTTLE DOWN TO 65%

NOMINAL

40.0

VEHICLE RESPONDS TO WIND

NOMINAL

52.084

START SSME THROTTLE UP TO 104%

NOMINAL

58.774

FIRST INDICATION OF SMOKE FROM -Z SIDE OF RH SRB FORWARD OF AFT ET ATTACH RING

CAMERA 207

[451] [Ref.2/13-6 2 of 4] STS 51-L ASCENT TIMELINE (CONT'D).

(AS OF 2/12/86)

REMARKS

59.0

MAXIMUM DYNAMIC PRESSURE

NOMINAL

59.249

WELL DEFINED INTENSE PLUME ON SIDE OF RH SRB -Z DIRECTION

CAMERA 207

60.164

SRB CHAMBER PRESSURE DIVERGENCE (RH FROM LH)

TELEMETRY DATA

60.600

EVIDENCE OF FLAME FROM RH SRB IN -Z DIRECTION

CAMERA 206

62.484

RIGHT HAND OUTBOARD ELEVON HINGE MOVEMENT SPIKE

TELEMETRY DATA

63.924

RIGHT HAND OUTBOARD ACTUATOR [Delta] P CHANGE

TELEMETRY DATA

64.604

START OF VEHICLE PITCH RATE CHANGE

TELEMETRY DATA

64.937

START SSME PITCH VARIATIONS

TELEMETRY DATA

65.404

END OF VEHICLE PITCH RATE CHANGE

TELEMETRY DATA

65.524

LEFT HAND OUTBOARD ACTUATOR [Delta] P CHANGE

TELEMETRY DATA

66.174

BRIGHT SPOT ON RH SRB IN PLUME IN -Z DIRECTION- START OF BRIGHT SPOTS ON +Z SIDE

CAMERA 207

66.484

ET LH2 ULLAGE PRESSURE DEVIATION

TELEMETRY DATA

66.625

BRIGHT SUSTAINED GLOW ON +Z SIDE OF RH SRB

CAMERA 207

67.650

APPARENT MERGING OF PLUME

CAMERA 207

[451] [Ref.2/13-6 3 of 4] STS 51-L ASCENT TIMELINE (CONT'D).

(AS OF 2/12/86)

REMARKS

67.684

MPS LO2 INLET PRESSURE RISE RATE DECREASED

TELEMETRY DATA

72.141

VEHICLE LATERAL +Y ACCELERATION 0.227G

TELEMETRY DATA

72.201

START OF DIVERGENT -YAW RATES RH VS LH SRB

TELEMETRY DATA

72.281

START OF DIVERGENT + PITCH RATES RH VS LH SRB

TELEMETRY DATA

72.40

LAST TDRSS DATA

TELEMETRY DATA

72.661

VEHICLE LATERAL -Y ACCELERATION 0.254G

TELEMETRY DATA

72.884

START MPS LO2 AND LH2 INLET PRESSURE DROPS

TELEMETRY DATA

73.044

RH SRB CHAMBER PRESSURE 24 PS! LOWER THAN LH (5 SIGMA)

TELEMETRY DATA

73.175

SUDDEN CLOUD ALONG SIDE OF ET

CAMERA 207

73.200

FLASH FROM REGION BETWEEN ORBITER

CAMERA 206

73.201

AND ET LH2 TANK

CAMERA 206

73.226

EXPLOSION NEAR SRB FORWARD ATTACH

CAMERA 206

73.326

INCREASED INTENSITY OF WHITE FLASH IN REGION OF ET LOX TANK

CAMERA 206

[452] [Ref.2/13-6 4 of 4] STS 51-L ASCENT TIMELINE (CONT 'D) .

(AS OF 2/12/86)

 

REMARKS

73.399

SSMEs APPROACHING HPFT REDLINE LIMITS

TELEMETRY DATA

73.473

ORBITER RCS CHAMBER PRESS MEAS FLUCTUATIONS

TELEMETRY DATA

73.534

SSME NUMBER 1 SHUTDOWN DUE TO HPFT DISCHARGE TEMPERATURE EXCEEDANCE

TELEMETRY DATA

73.605

LAST VALIDATED DATA - ORB RCS PRESSURE

TELEMETRY DATA

73.621

LAST DATA FRAME

TELEMETRY STOPS

76.425

RH SRB NOSE CAP SEP/DROGUE CHUTE DEPLOY

CAMERA 206

109.604

RH SRB RSS DESTRUCT

CAMERA 230

110.266

LH SRB RSS DESTRUCT

CAMERA 201

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