Of
course, Apollo was the famous American space project of
manned rockets from NASA (National Aeronautical and Space
Administration),and Apollo’s mission seemed to put American
astronauts in orbit, or to the moon. It was, from reading American history
and studying it as a teenager, a prelude to a new swath of space missions
from NASA—called The Space Shuttle.
It is
pretty admirable and felicitous that Apollo 11, of course,
was the most-famous of the Apollo space
missions—urged on by President John F. Kennedy at the time. It was that mission
that involved a successful first moon landing of an American
spaceship, and where astronaut Neil Armstrong walked from an already-landed
LEM (or lunar extraction module) into the partial gravity milieu
of the
moon with his timeless quote on his own comlink –
“one step for
man….one giant leap for mankind.” All of the
astronauts then went from the moon to the earth and re-entry to the
atmosphere and splashdown went almost textbook perfect with virtually no
problems. So it took watching the film “Apollo 13” (1995) to figure out
what would be called one of the most unorthodox missions than
any other Apollo mission in NASA’s space history.
Now,
Apollo 13 was going to get its shot like what Apollo 11 did---another shot to the moon. But there would be no
Armstrong on the flight – three new astronauts joined up for this mission.
They would be Fred Haise, Jimmy Swigert, and Jim Lovell. Ken
Mattingly was going to be the lunar module pilot but regrettably
contracted the measles indirectly with no chance of being protected so he
was kicked off the primary crew and Jimmy Swigert came in Ken’s
place.
On April
11, 1970, at 1:13 p.m., the rocket blasted off, and about a few minutes into the blast off, one of the 5
engines prematurely shut down and there was a bit of fear that the
mission would be scrubbed but Mission Control said the mission is
still go.
At 12 minutes and 34 seconds, final main engine
cutoff and that was
it.
Apollo is now in orbit and eventually takes
its route from orbit to the moon. A required docking configuration to
allow landing of the moon took place—called CSM (or Command and Service
Module) docking—and after the dock was completed with success, then the LEM (the lunar extraction module) did its extraction from the
outer skin of the spent main rocket and the Apollo 13’s LEM, as well as
the service module and the command module (all attached to the LEM)
was destined for the moon.
The mission was for Apollo 13 to land on an area of the moon called the Fra Mauro
highlands, an area not used by the Apollo 11’s LEM when it landed on the moon.
Then, the
order from Mission control involved stirring the two
oxygen tanks around the SM (or service module) of
the spacecraft. The cryostir, as it is called, is started
by Jim, starts and then, master alarms go off, then several loud bangs and
shimmies, and Fred, Jimmy and Jim realize that something major is happening
to the craft—in a very serious way, but not to their liking. Then even worse for the spaceship as the crew
finds out more master alarms go off, and they respond to them.
They shut off main switches and start others, and as they try to go
around the ship to find something wrong from that famous quote Jim
said, “Houston, we have a problem!”, Jim finally finds the culprit of
the series of problems outside—-from the part of the SM where
the explosion happened….venting of something, a gas…and Jim realizes
that the spacecraft is leaking oxygen. Mission Control is
astounded, and so are they. Now, Mission Control realizes that 2 fuel
cells responsible for the oxygen needed to shut down, and the astronauts
do shut down the cells, but sadly, Jim tells the other crew members
the sad reality…“We lost the moon.” Then, they realize that the
explosion caused a major loss of battery power in the other undamaged
parts of the spacecraft, and fearing that they could die in the
middle of space with no battery power left to go home, they decide
to turn off any unnecessary power to the command module and move
their operations to the LEM. But a wrench came into their attempted shutdown came when they temporary lost guidance and gimble control of the spacecraft, and realizing that the spacecraft could go way off course and not reach the moon at all, the astronauts did find a way to get back control of the spacecraft with help of Mission control, and finally, control of the ship was gradually going back to normal.
Turning off the command module would
create an awful side
effect of losing any heat power from the batteries
but it had to be
done, so the command module’s temperature
eventually went down as
low as 10-15 degrees while they were quite warm in
the LEM.
But
there was another problem as Mission Control decided that
the best way for them to return home was a FRT
(Free-Return
Trajectory); Mission Control feared that if they
re-fired the SM
engine that was damaged, another explosion would
result and could
cause complete disintegration of the whole
spacecraft and all three
astronauts would die, so the best careful option
was to get them
around the moon without landing on it, and then
make a re-fire using
not the SM engine, but the LEM engine. And it
cannot be done until
they went around the moon, so Apollo 13 went
around the moon and
headed towards Earth.
So, as
the astronauts felt the freezing draft from their powered-off CM, Mission Control’s data readout for the
saving off power was underestimated and they learned that if they
continued to keep the LEM at full power at that point (because the
mission specialists now feared that unneeded amperage in the LEM had
caused a rapid wasting of necessary battery power, which means
power would die and re-entry would be impossible), the spacecraft
would miss way off their re-entry mark and miss Earth entirely and
the crew would die of hypothermia and starvation if they missed
re-entry). So Mission Control placed a dranconian measure on the
crew—the astronauts were told to turn off unneeded power to the LEM, and
that included the heat too.
So the astronauts were now faced with
much more cold (at this point, temperatures went down as low as -5 to 0F--enough to create ice) and
even worse, Mission Control had found out that the
CO2 scrubbers were compromised in the explosion, and caused an
increase in concentration in CO2 levels in the spacecraft (the gauges for the C02 levels already were at 8-9, and were going to go past 15, which meant the astronauts would pass out from hypoxia from excess CO2 exposure and eventually black out and die); and not only
that, what made it worse for this new problem with the CO2 levels was that
incompatability of the scrubbers (the mechanisms that kept excess CO2
out of the craft)because the LEM scrubbers were round and the CO2
assemblies on the LEM were designed only for square scrubbers.
So
Mission Control made up an idea to use the different-shaped scrubbers just in
time just before the astronauts passed out from asphyxiation from
breathing in more and more CO2 that infiltrated more of their area. That
idea worked and eventually the CO2 levels were back to normal—and
not dangerous—-levels.
Now the
crew, very cold and very weary, had to do what is called a CCB—corridor control burn, a very special type of
burn probably never been done on other Apollo missions, with the LEM
engine. And when the LEM engine fired, Mission Control still warned
them from using the computer to control the corridor because they
still needed to save power in the LEM for re-entry, so they had to do
all of that stuff manually using manual controls, so Fred was picked
to control
the manual features of the craft that especially
controlled the pitch and Jimmy controlled the time, and Jim did the
rest – using the earth as a focal point. Then the LEM engine fired and it
did fire, and then when shutdown happened, they got good news from
Mission Control. The new data came out and said that they have enough
power left to go to Earth.
In the
meantime, Ken Mattingly was forced up from his sleep by
NASA officials, explaining what happened to the
Apollo spacecraft and was ordered into a simulation area that
involved a replica of a
command module. Ken was to figure out the power-up
sequence for the
command module that was powered off and the object
is to get enough
amperage but not too much of it to cause a total
permanent shutdown
of the craft. Several tries failed in his planned
sequences, but then, just at the critical mark, he found a power-up
sequence that would work. There was about at least a 30-minute delay
for the crew to getKen’s power sequence to them so they remained
really cold until then.
Then, it was time. Ken’s successful sequence is
rushed to the Mission Control room, and then, he gets the main comlink
to the
astronauts. The main worry at the start of the
power-up was conden-
sation on the panel controls—which could mean a
short and the whole
sequence could fail if it happened, but each one
of the power
apparatus was lit one at a time – and finally, the
computer was on
and that was it—everything was back on. Now the
worries are on the
pyrotechnic batteries for the parachutes—were they
frozen up when thecommand module had to be turned off?
Now,
with the earth becoming bigger and bigger every time, it
was time to say goodbye to parts of the Apollo 13
spacecraft with
two jettisoning procedures. First, they had to
separate the SM,
which they did, and they saw the major damage to
part of the
spacecraft due to the oxygen tank explosion. Then,
as they tried
to make sure that the pyro batteries were still
good, they had to
move everything they needed into the command
module just before they
had to say goodbye to the LEM with another
jettison procedure that
separated the LEM from the command module. The
separation was
successful but it was sad to see that ship that
saved them from
complete doom go off into the vast regions of
space as simply “space
junk”.
Now,
the biggest worry was the heat shield on the CM. Did it
get damaged in the explosion? (If the shield was
damaged when it
re-enters earth, the whole craft would burn up and
all three crew
members would die of incineration.) And what about
the parachute
batteries? (If the parachute batteries do not work
and the chutes do
not open on splashdown, the spacecraft would land
in the water at 300 mph, and even with seat belts, the astronauts
would still hit their heads so fast and die of traumatic concussion,
instead of 20 miles per hour if the chutes were to work.)
As they
was about to go into the earth atmosphere, fortunately, the computer aligned the craft for re-entry, which
would be somewhere near Iwo Jima in the Pacific, but sadly, there was
a typhoon approaching near the splashdown zone. But Mission
Control decided that it is still time for them to go home, so with
radio silence completed for about 4-5 minutes as the CM goes into re-entry
and the craft goes into a fiery wick, everybody who was involved in
the mission were holding its breath – worried that the heat shield
could not work.
The hope for the astronauts now was that the craft
would survive re-entry so they can go out of the radio blackout zone and
tell Mission Control that it was a successful re-entry.
Then
about 5 ½ minutes later, word from the crew to Mission
Control—the re-entry was successful – the
heat-shield did its job
and the parachutes finally opened up several miles
above the water.
Then the water embraced the craft as the CM splashed
down into the
open water and just floated there. A battleship
approached the CM
and rescued the 3 astronauts who were finally home
after what would
have been a disastrous mission.