| GET * |
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| 55:52:31 | Master caution and warning triggered
by low hydrogen pressure in tank No. 1.
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| 55:52:58 | CopCom (Charlie Duke):
"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-"
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| 55:53:06 | Swigert- "Okay."
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| 55:53:07 | "-for looking at the Comet Bennett,
if you need it."
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| 55:53:12 | Swigert- "Okay. Stand by."
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| 55:53:18 | Oxygen tank No. 1 fans on.
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| 55:53:19 | Oxygen tank No. 2 pressure decreases 8 psi.
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| 55:53:20 | Oxygen tank No. 2 fans turned on.
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| 55:53:20 | Stabilization control system electrical
disturbance indicates a power transient.
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| 55:53:21 | Oxygen tank No. 2 pressure decreases 4 psi.
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| 55:53:22.718 | Stabilization control system electrical
disturbance indicates a power transient.
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| 55:53:22.757 | 1.2-volt decrease in cic bus 2
voltage.
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| 55:53:22.772 | 11.1-amp rise in fuel cell 3
current for one sample.
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| 55:53:36 | Oxygen tank No. 2 pressure begins
rise lasting for 24 seconds.
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| 55:53:38.057 | 11-volt decrease in ac bus 2
voltage for one sample.
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| 55:53:38.085 | Stabilization control system
electrical disturbance indicates a power transient.
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| 55:53:41.172 | 22.9-amp rise in fuel cell 3
current for one sample.
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| 55:53:41.192 | Stabilization control system
electrical disturbance indicates a power transient.
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| 55:54:00 | Oxygen tank No. 2 pressure rise
ends of a pressure of 953.8 psia.
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| 55:54:15 | Oxygen tank No. 2 pressure begins to rise.
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| 55:54:30 | Oxygen tank No. 2 quantity drops
from full scale for 2 seconds and then reads 75.3 percent.
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| 55:54:31 | Oxygen tank No. 2 temperature begins
to rise rapidly.
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| 55:54:43 | Flow rate of oxygen to all three fuel
cells begins to decrease.
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| 55:54:45 | Oxygen tank No. 2 pressure reaches
maximum volue of 1008.3 psia.
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| 55:54:51 | Oxygen tank No. 2 quantity jumps to
off-scale high and then begins to drop until
the time of telemetry loss, indicating from 2.5 minutes be
re failed sensor.
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| 55:54:52 | Oxygen tank No. 2 temperature reads -151.30° F.
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| 55:54:52.703 | Oxygen tank No. 2 temperature suddenly
goes off-scale low, indicating failed sensor.
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| 55:54:52.763 | Last telemetered pressure from
oxygen tank No. 2 before telemetry loss is 995.7 psia.
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| 55:54:53.182 | Sudden accelerometer activity
on X, Y, Z axes.
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| 55:54:53.220 | Stabilization control system rate
changes begin.
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| 55:54:53.323 | Oxygen tank No. 1 pressure
drops 4.2 psi.
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| 55:54:53.500 | 2.8-amp rise in total fuel cell
current.
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| 55:54:53.542 | X, Y, and Z accelerations in CM
indicate 1.179, 0.65g, and 0.659.
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| 55:54:53.555 | Loss of telemetry.
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| 55:54:53.555+ | Master caution and warning triggered by dc
main bus 8 undervoltage. Alarm is turned off in
6 seconds. All indications are that the cryogenic
oxygen tank No. 2 lost pressure in this time period
and the panel separated.
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| 55:54:54.741 | Nitrogen pressure in fuel cell 1 is off-scale
low indicating failed sensor.
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| 55:54:55.350 | Telemetry recovered.
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| 55:54:56 | Service propulsion system engine valve body
temperature begins a rise of 1.65° F in 7 seconds.
Dc main bus A decreases 0.9 volt to 28.5 volts und
dc main bus B decreases 0.9 volt to 29.0 volts.
Total fuel cell current is 15 amps higher than the final
value before telemetry loss. High current continues for 19
seconds. Oxygen tank No. 2 temperature reads offscale
high after telemetry recovery, probably indicating failed
sensors. Oxygen tank No. 2 pressure reads offscale low
following telemetry recovery, indicating a broken supply line,
a tank pressure below 19 psi, or a failed sensor.
Oxygen tank No. 1 pressure reads 781.9 psia und begins to drop.
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| 55:54:57 | Oxygen tank No. 2 quantity reads off-scale high
following telemetry recovery incdicating failed sensor.
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| 55:55:01 | Oxygen flow rates to fuel cells 1 und 3
approached zero after decreasing for 7 seconds.
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| 55:55:02 | The surface temperature of the service
module oxidizer tank in bay 3 begins a 3.8° F increase in a
15-second period.
The service propulsion system helium tank temperature begins a
3.8° F increase in a 32-second period.
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| 55:55:09 | Dc main bus A voltage recovers to minutes after
29.0 volts; dc main bus 8 recovers to 28.8.
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| 55:55:20 | Swigert: "Okay, Houston, we'ye had a problem here."
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| 55:55:28 | Duke: "This is Houston. Say again, please."
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| 55:55:35 | Lovell: "Houston, we've had a problem. We've had
a main B bus undervolt.
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| 55:55:42 | Duke: "Roger. Main B undervolt."
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| 55:55:49 | Oxygen tank No. 2 temperature begins
steady drop lasting 59 seconds, indicating failed sensor.
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| 55:56:10 | Haise: "Okay. Right now, Houston, the voltage
is - is looking good. And we had a pretty large bang
associated with the caution und warning there.
And as I recall, main B was the one that had an amp
spike on it once before."
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| 55:56:30 | Duke: "Roger, Fred."
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| 55:56:38 | Oxygen tank No. 2 quantity becomes erratic for
69 seconds before assuming an off-scale-low state,
indicating failed sensor.
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| 55:56:54 | Haise: "In the interim here, we're starting to go
ahead und button up the tunnel again."
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| 55:57:04 | Haise: "That jolt must have rocked the sensor
on - see now - oxygen quantity 2. It was oscillating down around
20 to 60 percent. Now it's full-scale high."
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| 55:57:39 | Master caution und warning triggered by dc main
bus B undervoltage alarm is turned off in 6 seconds.
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| 55:57:40 | Dc main bus B drops below 2 25 volts und
continues to fall rapidly.
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| 55:57:44 | Lovell: "Okay. And we're looking at our service
module RCS helium 1. We have - B is barber poled und D is
barber poled, helium 2, D is barber pole, und secondary
propellants, I have A und C barber pole." Ac bus fails
within 2 seconds.
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| 55:57:45 | Fuel cell 3 fails.
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| 55:57:59 | Fuel cell current begins to decrease.
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| 55:58:02 | Master caution und warning caused by
ac bus 2 being reset.
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| 55:58:06 | Master caution und warning triggered
by dc main bus A undervoltage.
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| 55:58:07 | Dc main bus A drops below 26 25
volts und in the next few seconds levels
oft at 25.5 volts.
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| 55:58:07 | Haise: "Ac 2 is showing zip."
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| 55:58:25 | Haise: "Yes, we got a main bus A undervolt
now, too, showing. Its reading about 251/2. Main B
is reading zip right now."
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| 56:00:06 | Master caution und warning triggered by
high hydrogen flow rate to fuel cell 2.
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