Apollo 13 Timeline
Event |
GET (hhh:mm:ss) |
GMT Time |
GMT Date |
Terminal countdown started at T-28 hours. |
-028: |
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Scheduled 9-hour 13-minute hold at T-9 hours. |
-009: |
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Countdown resumed at T-9 hours. |
-009: |
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Scheduled 1-hour hold at T-3 hours 30 minutes. |
-003:30:00 |
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Countdown resumed at T-3 hours 30 minutes. |
-003:30:00 |
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Guidance reference release. |
-000:00:16.961 |
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S-IC engine start command. |
-000:00:08.9 |
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S-IC engine ignition (#5). |
-000:00:06.7 |
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All S-IC engines thrust OK. |
-000:00:01.4 |
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Range zero. |
000:00:00.00 |
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All holddown arms released (1st motion) (1.06 g). |
000:00:00.3 |
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Liftoff (umbilical disconnected). |
000:00:00.61 |
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Tower clearance yaw maneuver started. |
000:00:02.3 |
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Yaw maneuver ended. |
000:00:10.0 |
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Pitch and roll maneuver started. |
000:00:12.6 |
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Roll maneuver ended. |
000:00:32.1 |
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Mach 1 achieved. |
000:01:08.4 |
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Maximum bending moment achieved (69,000,000 lbf-in). |
000: |
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Maximum dynamic pressure (651.63 lb/ft2). |
000:01:21.3 |
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S-IC center engine cutoff command. |
000:02:15.18 |
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Pitch maneuver ended. |
000:02:43.3 |
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S-IC outboard engine cutoff. |
000:02:43.60 |
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S-IC maximum total inertial acceleration (3.83 g). |
000:02:43.70 |
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S-IC maximum Earth-fixed velocity. |
000:02:44.10 |
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S-IC/S-II separation command. |
000:02:44.3 |
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S-II engine start command. |
000:02:45.0 |
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S-II ignition. |
000:02:46.0 |
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S-II aft interstage jettisoned. |
000:03:14.3 |
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Launch escape tower jettisoned. |
000:03:21.0 |
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Iterative guidance mode initiated. |
000:03:24.5 |
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S-IC apex. |
000:04:31.7 |
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S-II center (or "inboard") engine cutoff (S-II engine #5 cutoff 132.36 seconds early). |
000:05:30.64 |
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CMP (Swigert): "Inboard." |
000: |
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CAPCOM (Joe Kerwin): "We confirm inboard out." |
000: |
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CDR (Lovell): "That shouldn't have happened." |
000: |
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CMP: "No, that's at 7 minutes 42 seconds into the flight, not 5 minutes 30 seconds. |
000: |
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S-II command to complete CECO. |
000:07:42.6 |
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S-II maximum total inertial acceleration (1.66 g). |
000:08:57.00 |
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S-IC impact (theoretical). |
000:09:06.9 |
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S-II outboard engine cutoff (34.53 seconds later than planned). |
000:09:52.64 |
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S-II maximum Earth-fixed velocity; S-II/S-IVB separation command. |
000:09:53.50 |
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S-IVB 1st burn start command. |
000:09:53.60 |
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S-IVB 1st burn ignition. |
000:09:56.90 |
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S-IVB ullage case jettisoned. |
000:10:05.4 |
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S-II apex. |
000:10:32.2 |
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S-IVB 1st burn cutoff (9 seconds later than planned). |
000:12:29.83 |
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S-IVB 1st burn maximum total inertial acceleration (0.58 g). |
000:12:30.00 |
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S-IVB 1st burn maximum Earth-fixed velocity. |
000:12:30.50 |
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Earth orbit insertion. |
000:12:39.83 |
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Maneuver to local horizontal attitude started. |
000:12:50.1 |
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Orbital navigation started. |
000:14:10.4 |
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S-II impact (theoretical). |
000:20:58.1 |
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TV transmission started. |
001:37 |
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TV transmission ended. |
001:43 |
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S-IVB 2nd burn restart preparation. |
002:26:08.10 |
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S-IVB 2nd burn restart command. |
002:35:38.10 |
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S-IVB 2nd burn ignition. |
002:35:46.30 |
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S-IVB 2nd burn cutoff. |
002:41:37.15 |
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S-IVB 2nd burn maximum total inertial acceleration (1.44 g). |
002:41:37.23 |
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S-IVB 2nd burn maximum Earth-fixed velocity. |
002:41:37.80 |
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S-IVB safing procedures started. |
002:41:37.9 |
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Translunar injection. |
002:41:47.15 |
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Maneuver to local horizontal attitude and orbital navigation started. |
002:44:08 |
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Maneuver to transposition and docking attitude started. |
002:56:38.3 |
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CSM separated from S-IVB. |
003:06:38.9 |
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TV transmission started. |
003:09 |
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CSM docked with LM/S-IVB. |
003:19:08.8 |
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CSM/LM ejected from S-IVB. |
004:01:00.8 |
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S-IVB maneuver to evasive APS burn attitude. |
004: |
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S-IVB APS evasive maneuver ignition. |
004:18:00.6 |
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S-IVB APS evasive maneuver cutoff. |
004:19:20.8 |
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TV transmission ended. |
004:20 |
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S-IVB maneuver to LOX dump attitude initiated. |
004:27:40.0 |
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S-IVB lunar impact maneuver - CVS vent opened. |
004:34:39.4 |
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S-IVB lunar impact maneuver - LOX dump started. |
004:39:19.4 |
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S-IVB lunar impact maneuver - CVS vent opened. |
004:39:39.4 |
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S-IVB lunar impact maneuver - LOX dump ended. |
004:40:07.4 |
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Maneuver to attitude for final S-IVB APS burn initiated. |
005:48:07.8 |
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S-IVB lunar impact maneuver - APS ignition. |
005:59:59.5 |
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S-IVB lunar impact maneuver - APS cutoff. |
006:03:36.7 |
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Earth weather photography started. |
007: |
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Unsuccessful passive thermal control attempt. |
007:43:02 |
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Earth weather photography ended. |
011: |
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2nd S-IVB transposition maneuver (unplanned) initiated by launch vehicle digital computer. |
013:42:33 |
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Unplanned S-IVB velocity increase of 5 feet per second which altered lunar impact trajectory closer to target point. |
019:29:10 |
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TV transmission started. |
030:13 |
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Midcourse correction ignition (SPS) - transfer to hybrid non-free return trajectory. |
030:40:49.65 |
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Midcourse correction cutoff. |
030:40:53.14 |
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TV transmission ended. |
031:02 |
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Photography of Comet Bennett. |
031:50 |
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Unsuccessful passive thermal control attempt. |
032:21:49 |
|
|
Crew turned on fans in oxygen tank #2 (routine procedure). |
046:40:02 |
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Cryogenic oxygen tank #2 quantity gauge indicated "off-scale high," of over 100% (probably due to short circuit). First indication of a problem. |
046:40:05 |
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|
Cryogenic oxygen tank #2 quantity probe short circuited. |
046:40:08 |
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|
Oxygen tank #2 fans turned on again with no apparent adverse affects. Quantity gauge continued to read "off-scale high." |
047:54:50 |
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Oxygen tank #2 fans turned on again with no apparent adverse affects. Quantity gauge continued to read "off-scale high." |
051:07:44 |
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CDR and LMP cleared to enter the LM to commence inflight inspection. |
053:27 |
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|
LMP entered LM. |
054:20 |
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CDR entered LM. |
054:25 |
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LM system checks. |
054:40 |
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TV transmission started. |
055:14 |
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|
CDR and LMP entered LM. |
055:30 |
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TV transmission ended. |
055:46:30 |
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Tunnel hatch closed. |
055:50 |
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Master caution and warning triggered by low hydrogen pressure in tank #1. Alarm turned off after 4 seconds. |
055:52:31 |
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CAPCOM (Jack Lousma): "13, we've got one more item for you, when you get a chance. We'd like you to stir up your cryo tanks. In addition, I have shaft and trunnion..." |
055:52:58 |
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CMP (Swigert): "Okay." |
055:53:06 |
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CAPCOM: "...for looking at the Comet Bennett, if you need it." |
055:53:07 |
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CMP: "Okay. Stand by." |
055:53:12 |
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Oxygen tank #1 fans on. |
055:53:18 |
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Oxygen tank #1 pressure decreased 8 psi due to normal destratification. Spacecraft current increased by 1 ampere. |
055:53:19 |
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Oxygen tank #2 fans on. Stabilization control system electrical disturbance indicated a power transient. |
055:53:20 |
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Oxygen tank #2 pressured decreased 4 psi. |
055:53:21 |
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Electrical short in tank #2 (stabilization control system electrical disturbance indicated a power transient.) |
055:53:22.718 |
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1.2-volt decrease in AC bus #2 voltage. |
055:53:22.757 |
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11.1 ampere “spike” recorded in fuel cell #3 current followed by drop in current and rise in voltage typical of removal of power from one fan motor, indicating opening of motor circuit. |
055:53:22.772 |
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|
Oxygen tank #2 pressure started to rise for 24 seconds. |
055:53:36 |
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11-volt decrease in AC bus #2 voltage for one sample. |
055:53:38.057 |
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Stabilization control system electrical disturbance indicated a power transient. |
055:53:38.085 |
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22.9-ampere “spike” recorded in fuel cell #3 current, followed by drop in current and rising voltage typical of one fan motor, indicating opening of another motor circuit. |
055:53:41.172 |
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Stabilization control system electrical disturbance indicated a power transient. |
055:53:41.192 |
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Oxygen tank #2 pressure rise ended at a pressure of 953.8 psia. |
055:54:00 |
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Oxygen tank #2 pressure started to rise again. |
055:54:15 |
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Oxygen tank #2 quantity dropped from full scale (to which it had failed at 046:40) for two seconds and then read 75.3% full. This indicated the gauge short circuit may have corrected itself. |
055:54:30 |
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Oxygen tank #2 temperature started to rise rapidly. |
055:54:31 |
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Flow rate of oxygen to all three fuel cells started to decrease. |
055:54:43 |
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Oxygen tank #2 pressure reached maximum value of 1,008.3 psia. |
055:54:45 |
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Oxygen tank #2 temperature rises 40 °F for one sample (invalid reading) |
055:54:48 |
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Oxygen tank #2 quantity jumped to off-scale high and then started to drop until the time of telemetry loss, indicating a failed sensor. |
055:54:51 |
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Oxygen tank #2 temperature read -151.3 °F. Last valid indication. |
055:54:52 |
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Oxygen tank #2 temperature suddenly went off-scale low, indicating a failed sensor. |
055:54:52.703 |
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Last telemetered pressure from oxygen tank #2 before telemetry loss was 995.7 psia. |
055:54:52.763 |
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Sudden accelerometer activity on X, Y, and Z axes. |
055:54:53.182 |
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Body-mounted roll, pitch, and yaw rate gyros showed low-level activity for 1/4 second. |
055:54:53.220 |
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Oxygen tank #1 pressure dropped 4.2 psi. |
055:54:53.323 |
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2.8-amp rise in total fuel cell current. |
055:54:53.5 |
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X, Y, and Z accelerations in CM indicate 1.17 g, 0.65 g, and 0.65 g. |
055:54:53.542 |
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Telemetry loss for 1.8 seconds. Master caution and warning triggered by DC main bus B undervoltage. Alarm turned off in 6 seconds. Indications were that the cryogenic oxygen tank #2 lost pressure during this time period and the panel separated. It was at this time that the crew heard a loud bang. |
055:54:53.555 |
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Nitrogen pressure in fuel cell #1 went off-scale low indicating a failed sensor. |
055:54:54.741 |
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Telemetry recovered. |
055:54:55.35 |
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Service propulsion system engine valve body temperature started a rise of 1.65 °F in 7 seconds. DC main bus A decreased 0.9 volt to 28.5 volts and DC main bus B decreased 0.9 volt to 29.0 volts. Total fuel cell current was 15 amps higher than the final value before telemetry loss. High current continued for 19 seconds. Oxygen tank #2 temperature read off-scale high after telemetry recovery, probably indicating failed sensors. Oxygen tank #2 pressure read off-scale low following telemetry recovery, indicating a broken supply line, a tank pressure below 19 psia, or a failed sensor. Oxygen tank #1 pressure read 781.9 psia and started to drop steadily. Pressure dropped over a period of 130 minutes to the point at which it was insufficient to sustain operation of fuel cell #2. |
055:54:56 |
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Oxygen tank #2 quantity read off-scale high following telemetry recovery indicating a failed sensor. |
055:54:57 |
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The reaction control system helium tank C temperature began a 1.66 °F increase in 36 seconds. |
055:54:59 |
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Oxygen flow rates to fuel cells #1 and #3 approached zero after decreasing for 7 seconds. |
055:55:01 |
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Surface temperature of SM oxidizer tank in bay #3 started a 3.8 °F increase in a 15-second period. Service propulsion system helium tank temperature started a 3.8 °F increase in a 32-second period. |
055:55:02 |
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DC main bus A voltage recovered to 29.0 volts. DC main bus B recovered to 28.8. |
055:55:09 |
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CMP: "Okay, |
055:55:20 |
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CAPCOM: "This is |
055:55:28 |
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CDR: " |
055:55:35 |
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CAPCOM: "Roger. Main B bus undervolt." |
055:55:42 |
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Oxygen tank #2 temperature started steady drop lasting 59 seconds, indicating a failed sensor. |
055:55:49 |
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LMP (Haise): "Okay. Right now, associated with the caution and warning there. And as I recall, main B was the one that had an amp spike on it once before." |
055:56:10 |
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CAPCOM: "Roger, Fred." |
055:56:30 |
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Oxygen tank #2 quantity became erratic for 69 seconds before assuming an off-scale-low state, indicating a failed sensor. |
055:56:38 |
|
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LMP: "In the interim here, we're starting to go ahead and button up the tunnel again." |
055:56:54 |
|
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LMP: "That jolt must have rocked the sensor on - see now – O2 oxygen quantity 2. It was oscillating down around 20 to 60 percent. Now it's full-scale high." |
055:57:04 |
|
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Master caution and warning triggered by DC main bus B undervoltage. Alarm was turned off in six seconds. |
055:57:39 |
|
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DC main bus B dropped below 26.25 volts and continued to fall rapidly. |
055:57:40 |
|
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CDR: "Okay. And we're looking at our service module RCS helium 1. We have – B is barber poled and D is barber poled, helium 2, D is barber pole, and secondary propellants, I have A and C barber pole." AC bus fails within two seconds. |
055:57:44 |
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Fuel cell #3 failed. |
055:57:45 |
|
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Fuel cell current started to decrease. |
055:57:59 |
|
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Master caution and warning caused by AC bus #2 being reset. |
055:58:02 |
|
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Master caution and warning triggered by DC main bus A undervoltage. |
055:58:06 |
|
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DC main bus A dropped below 26.25 volts and in the next few seconds leveled off at 25.5 volts. |
055:58:07 |
|
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LMP: "AC #2 is showing zip." |
055:58:07 |
|
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LMP: "Yes, we got a main bus A undervolt now, too, showing. It's reading about 25 and a half. Main B is reading zip right now." |
055:58:25 |
|
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Master caution and warning triggered by high hydrogen flow rate to fuel cell #2. |
056:00:06 |
|
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CDR: "...It looks to me, looking out the hatch, that we are venting something. We are venting something out into the - into space." |
056:09:07 |
|
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LMP reported fuel cell #1 off line. |
056:09:58 |
|
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Emergency power-down. |
056:33:49 |
|
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LMP reported fuel cell #3 off line. |
056:34:46 |
|
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CDR and LMP entered LM. |
057:43 |
|
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Shutdown of fuel cell #2. |
058:00 |
|
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CM computer and platform powered down. |
058:10 |
|
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CSM systems powered down. LM systems powered up. |
058:40 |
|
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Midcourse correction ignition to free-return trajectory (LM DPS). |
061:29:43.49 |
|
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Midcourse correction cutoff. |
061:30:17.72 |
|
|
LM systems powered down. |
062:50 |
|
|
Lunar occultation entered. |
077:08:35 |
|
|
Lunar occultation exited. |
077:33:10 |
|
|
S-IVB impact on lunar surface. |
077:56:40.0 |
|
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LM systems powered up. |
078:00 |
|
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Abort guidance system to primary guidance system aligned. |
078:10 |
|
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Transearth injection ignition (LM DPS). |
079:27:38.95 |
|
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Transearth injection cutoff. |
079:32:02.77 |
|
|
LM systems powered down. |
082:10 |
|
|
Apparent short-circuit in LM electrical system, accompanied by a “thump" in vicinity of descent stage and observation of venting for several minutes in area of LM descent batteries #1 and #2. |
097:13:53 |
|
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LM configured for midcourse correction. |
100:00 |
|
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CSM power configuration for telemetry established. |
101:20 |
|
|
CM powered up. |
101:53 |
|
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LM systems powered up. |
104:50 |
|
|
Midcourse correction ignition (LM DPS). |
105:18:28.0 |
|
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Midcourse correction cutoff. |
105:18:42.0 |
|
|
Passive thermal control started. |
105:20 |
|
|
LM systems powered down. |
105:50 |
|
|
LM power transferred to CSM. |
112:05 |
|
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|
112:20 |
|
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|
126:10 |
|
|
Battery B charge terminated. |
128:10 |
|
|
LM systems powered up. |
133:35 |
|
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Platform aligned. |
134:40 |
|
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Preparation for midcourse correction. |
136:30 |
|
|
Midcourse correction ignition (LM RCS). |
137:39:51.5 |
|
|
Midcourse correction cutoff. |
137:40:13.0 |
|
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SM separation. |
138:01:48.0 |
|
|
SM photographed. |
138:15 |
|
|
CM powered up. |
140:10 |
|
|
Platform aligned. |
140:40 |
|
|
LM maneuvered to undocking attitude. |
140:50 |
|
|
LM jettisoned. |
141:30:00.2 |
|
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Entry. |
142:40:45.7 |
|
|
S-band contact with CM established by recovery aircraft. |
142:48 |
|
|
Visual contact with CM established by recovery helicopters. |
142:49 |
|
|
Visual contact with CM established by recovery ship. Voice contact with CM established by recovery helicopters. |
142:50 |
|
|
Splashdown (went to apex-up). |
142:54:41 |
|
|
Swimmers deployed to retrieve main parachutes. |
142:56 |
|
|
1st swimmer deployed to CM. |
143:03 |
|
|
Flotation collar inflated. |
143:11 |
|
|
Life preserver unit delivered to lead swimmer. |
143:18 |
|
|
CM hatch opened for crew egress. |
143:19 |
|
|
Crew egress. |
143:22 |
|
|
Crew aboard recovery helicopter. |
143:29 |
|
|
Crew aboard recovery ship. |
143:40 |
|
|
CM aboard recovery ship. |
144:23 |
|
|
Crew departed recovery ship for |
167:07 |
|
|
Crew arrived in |
199:22 |
|
|
Crew arrived at Ellington AFB, |
224:17 |
|
|
Recovery ship arrived in |
312:17 |
|
|
Safing of CM pyrotechnics completed. |
343:22 |
|
|
Deactivation of fuel and oxidizer completed. |
360:15 |
|
|
CM arrived at contractor's facility in |
378:47 |
|
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