Gravity (2 page)

Through the thunder of the solid propellant rocket boosters and the teeth-jarring rattle of the orbiter, the command abort sprang so clearly into Mission Specialist Emma Watson’s mind she might have heard it shouted through her comm unit. None of the crew had, in fact, said the word aloud, but in that instant she the choice had to be made, and quickly. She hadn’t heard the verdict yet from Commander Bob Kittredge or Pilot Jill Hewitt, in the cockpit in front of her. She didn’t need to. They had so long together as a team they could read each other’s minds, and the amber warning lights flashing on the shuttle’s flight console clearly dictated their next actions.

Seconds before, Endeavour had reached Max Q, the point during launch of greatest aerodynamic stress, when the orbiter, thrusting against the resistance of the atmosphere, begins to violently vibrate. Kittredge had briefly throttled back to seventy percent to ease the vibrations. Now the console warning lights told them they’d lost two of their three main engines.

Even with one main engine and two solid rocket boosters still firing, they would make it to orbit.

They had to abort the launch.

“Control, this is Endeavour,” said Kittredge, his voice crisp steady.

Not a hint of apprehension. “Unable to throttle up. Left center MES went out at Max Q. We are stuck in the bucket. Going to RTLS abort.”

“Roger, Endeavour. We confirm two MES out. Proceed to RTLS abort after SRB burnout.” Emma was already rifling through the stack of checklists, and she retrieved the card for

“Return to Launch Site Abort.” The crew knew every step of the procedure by heart, but in the frantic pace of an emergency abort, some vital action might be forgotten. The checklist was their security blanket.

Her heart racing, Emma scanned the appropriate path of action, clearly marked in blue. A two-engine-down RTLS abort was survivable—but only theoretically. A sequence of near miracles had to happen next. First they had to dump fuel and cut off the last main engine before separating from the huge external fuel tank. Then Kittredge would pitch the orbiter around to a heads-up attitude, pointing back toward the launch site. He would have one chance, only one, to guide them to a safe touchdown at Kennedy. A single mistake would send Endeavour plunging into the sea.

Their lives were now in the hands of Commander Kittredge.

His voice, in constant communication with Mission Control, still sounded steady, even a little bored, as they approached the two-minute mark. The next crisis point. The CRT display flashed the Pc<50 signal. The solid rocket boosters were burning out, on schedule.

Emma felt it at once, the startling deceleration as the boosters consumed the last of the fuel. Then a brilliant flash of light in window made her squint as the SRBS exploded away from the tank.

The roar of launch fell ominously silent, the violent shudder calming to a smooth, almost tranquil ride. In the abrupt calm, she was aware of her own pulse accelerating, her heart thudding like fist against her chest restraint.

“Control, this is Endeavour,” said Kittredge, still unnaturally calm.

“We have SRB sep.”

There is a Glossary at the end of this book that contains many of these abbreviations.

“Roger, we see it.”

“Initiating abort.” Kittredge depressed the Abort push button, the rotary switch already positioned at the RTLS option.

Over her comm unit, Emma heard Jill Hewitt call out, “Emma, let’s hear the checklist!”

“I’ve got it.” Emma began to read aloud, and the sound of her own voice was as startlingly calm as Kittredge’s and Hewitt’s.

Anyone listening to their dialogue would never have guessed they had a catastrophe. They had assumed machine mode, their panic suppressed, every action guided by rote memory and training. onboard computers would automatically set their return course.

They were continuing downrange, still climbing to four hundred thousand feet as they dissipated fuel.

Now she felt the dizzying spin as the orbiter began its pitcharound maneuver, rolling tail over nose. The horizon, which had been upside down, suddenly righted itself as they turned back toward Kennedy, almost four hundred miles away.

“Endeavour, this is Control. Go for main engine cutoff.”

“Roger,” responded Kittredge. “MECO now.” On the instrument panel, the three engine-status indicators suddenly flashed red. He had shut off the main engines, and in seconds, the external fuel tank would drop away into the sea.

Altitude dropping fast, thought Emma. But we’re headed for home.

She gave a start. A warning buzzed, and new panel lights flashed on the console.

“Control, we’ve lost computer number three!” cried Hewitt. “We have lost a nav-state vector! Repeat, we’ve lost a nav-state vector!”

“It could be an inertial-measurement malf,” said Andy Mercer, the other mission specialist seated beside Emma. “Take it off-line.”

“No! It might be a broken data bus!” cut in Emma. “I say we engage the backup.”

“Agreed,” snapped Kittredge.

“Going to backup,” said Hewitt. She switched to computer number five.

The vector reappeared. Every one heaved a sigh of relief.

The burst of explosive charges signaled the separation of the empty fuel tank. They couldn’t see it fall away into the sea, but knew another crisis point had just passed. The orbiter was flying free now, a fat and awkward bird gliding homeward.

Hewitt barked, “Shit! We’ve lost an APU!” Emma’s chin jerked up as a new buzzer sounded. An auxiliary power unit was out. Then another alarm screamed, and her gaze flew in panic to the consoles. A multitude of amber warning lights were flashing. On the video screens, all the data had vanished.

Instead there were only ominous black and white stripes. A catastrophic computer failure. They were flying without navigation data. Without flap control.

“Andy and I are on the APU malf!” yelled Emma.

“Reengage backup!” Hewitt flicked the switch and cursed. “I’m getting no joy, guys. Nothing’s happening—”

“Do it again!”

“Still not reengaging.”

“She’s banking!” cried Emma, and felt her stomach lurch sideways.

Kittredge wrestled with the joystick, but they had already rolled too far starboard. The horizon reeled to vertical and upside down. Emma’s stomach lurched again as they spun right side up. The next rotation came faster, the horizon twisting in sickening whirl of sky and sea and sky.

A death spiral.

She heard Hewitt groan, heard Kittredge say, with flat resignation, “I’ve lost her.” Then the fatal spin accelerated, plunging to an abrupt and shocking end.

There was only silence.

An amused voice said over their comm units, “Sorry, guys. You didn’t make it that time.”

Emma yanked off her headset. “That wasn’t fair, Hazel!” Jill Hewitt chimed in with a protesting, “Hey, you meant to kill us. There was no way to save it.” Emma was the first crew member to scramble out of the shuttle flight simulator. With the others right behind her, she marched into the windowless control room, where their three instructors at the row of consoles.

Team Leader Hazel Barra, wearing a mischievous smile, swiveled around to face Commander Kittredge’s irate crew of four.

Though Hazel looked like a buxom earth mother with her gloriously frizzy brown hair, she was, in truth, a ruthless gameplayer who ran her flight crews through the most difficult of simulations and seemed to count it as a victory whenever the crew failed to survive. Hazel was well aware of the fact that every launch could end in disaster, and she wanted her astronauts equipped with the to survive. Losing one of her teams was a nightmare she hoped never to face.

“That really was below the belt, Hazel,” complained Kittredge.

“Hey, you guys keep surviving. We have to knock down your cockiness a notch.”

“Come on,” said Andy. “Two engines down on liftoff? A broken data bus? An APU out? And then you throw in a failed number five computer? How many malfs and nits is that? It’s not realistic.”

Patrick, one of the other instructors, swiveled around with a grin. “You guys didn’t even notice the other stuff we did.”

“What else was there?”

“I threw in a nit on your oxygen tank sensor. None of you saw the change in the pressure gauge, did you?”

Kittredge gave a laugh. “When did we have time? We were juggling a dozen other malfunctions.”

Hazel raised a stout arm in a call for a truce. “Okay, guys. Maybe we did overdo it. Frankly, we were surprised you got as far as you did with the RTLS abort. We wanted to throw in another wrench, to make it more interesting.”

“You threw in the whole damn toolbox,” snorted Hewitt.

“The truth is,” said Patrick, “you guys are a little cocky.”

“The word is confident,” said Emma.

“Which is good,” Hazel admitted. “It’s good to be confident. You showed great teamwork at the integrated sim last week. Even Gordon Obie said he was impressed.”

“The Sphinx said that?” Kittredge’s eyebrow lifted in surprise.

Gordon Obie was the director of Flight Crew Operations, a man so bafflingly silent and aloof that no one at JSC really knew him. He would sit through entire mission management meetings without uttering a single word, yet no one doubted he was mentally recording every detail. Among the astronauts, Obie was viewed with both awe and more than a little fear. With his power over final flight assignments, he could make or break your career. The fact that he had praised Kittredge’s team was good news indeed.

In her next breath, though, Hazel kicked the pedestal out from under them. “However,” she said, “Obie is also concerned that guys are too lighthearted about this. That it’s still a game to you.”

“What does Obie expect us to do?” said Hewitt. “Obsess over the ten thousand ways we could crash and burn?”

“Disaster is not theoretical.” Hazel’s statement, so quietly spoken, made them fall momentarily silent. Since Challenger, every member of the astronaut was fully aware that it was only a matter of time before there was another major mishap. Human beings sitting atop rockets primed to explode with five million pounds of thrust can’t afford to be sanguine about the hazards of their profession. Yet they seldom thought about dying in space, to talk about it was to admit its possibility, to acknowledge that the next Challenger might carry one’s name on the crew roster.

Hazel realized she’d thrown a damper on their high spirits. It was not a good way to end a training session, and now she backpedaled on her earlier criticism.

“I’m only saying this because you guys are already so well integrated. I have to work hard to trip you up. You’ve got three till launch, and you’re already in good shape. But I want you in even better shape.”

“In other words, guys,” said Patrick from his console. “Not so cocky.” Bob Kittredge dipped his head in mock humility. “We’ll go home now and put on the hair shirts.”

“Overconfidence is dangerous,” said Hazel. She rose from the chair and stood up to face Kittredge. A veteran of three shuttle flights, Kittredge was half a head taller, and he had the bearing of a naval pilot, which he had once been. Hazel was not intimidated by Kittredge, or by any of her astronauts. Whether were rocket scientists or military heroes, they inspired in her same maternal concern, the wish that they make it back from their missions alive.

She said, “You’re so good at command, Bob, you’ve lulled your crew into thinking it’s easy.”

“No, they make it look easy. Because they’re good.”

“We’ll see. The integrated sim’s on for Tuesday, with Hawley and Higuchi aboard. We’ll be pulling some new tricks out of the hat.” Kittredge grinned.

“Okay, try to kill us. But be fair about it.

“Fate seldom plays fair,” Hazel said solemnly. “Don’t expect me to.”

Emma and Bob Kittredge sat in a booth in the Fly By Night saloon, sipping beers as they dissected the day’s simulations. It was a they’d established eleven months ago, early in their team building, when the four of them had first come together as the crew for shuttle flight 162.

Every Friday evening, they would meet in the Fly By Night, located just up NASA Road 1 from Johnson Space Center, and review the progress of their training. What they’d done right, what still needed improvement.

Kittredge, who’d personally selected each member of his crew, had started the ritual. Though they were already working together more than sixty hours a week, he never seemed eager to go home. Emma had thought it was because the recently divorced Kittredge now lived alone and dreaded returning to his empty house. But as she’d come to know him better, she realized these meetings were simply his way of prolonging the adrenaline high of his job. Kittredge lived to fly. For sheer entertainment he read the painfully dry shuttle manuals. He spent every free moment at the controls of one of NASA’s T-38s. It was almost as if he resented the force of gravity binding his feet the earth.

He couldn’t understand why the rest of his crew might want to go home at the end of the day, and tonight he seemed a little melancholy that just the two of them were sitting at their usual the Fly By Night. Jill Hewitt was at her nephew’s piano recital, Andy Mercer was home celebrating his tenth wedding anniversary.

Only Emma and Kittredge had shown up at the appointed hour, and now that they’d finished hashing over the week’s sims, there was a long silence between them. The conversation had run out of shop talk and therefore out of steam.

“I’m taking one of the T-38s up to White Sands tomorrow,” he said. “You want to join me?”

“Can’t. I have an appointment with my lawyer.”

“So you and Jack are forging ahead with it?”

She sighed. “The momentum’s established. Jack has his lawyer, and I have mine. This divorce has turned into a runaway train.”

“It sounds like you’re having second thoughts.”

Firmly she set down her beer. “I don’t have any second thoughts.”

“Then why’re you still wearing his ring?”

She looked down at the gold wedding band. With sudden ferocity she tried to yank it off, but found it wouldn’t budge. After years on her finger, the ring seemed to have molded itself to her flesh, refusing to be dislodged. She cursed and gave another tug, this time pulling so hard the ring scraped off skin as it slid over knuckle. She set the ring down on the table.