Subscribe free to our newsletters via your
. 24/7 Space News .

On the Early Retirement of the Space Shuttle
by George W. Jeffs
for Launchspace
Bethesda MD (SPX) May 17, 2011

File image.

A Symbol: An in-space ballerina and hypersonic flying marvel, the Space Shuttle Orbiter is almost impossible for others to duplicate and continues to generate international admiration and respect for U.S. technical capabilities.

Full Potential Not Yet Realized: The multi-functional Orbiter has performed "as designed" on all assignments including reentry and a key role in the International Space Station (ISS) assembly. Like any new manned system, as crews and engineers become more familiar (like a helicopter) performance "in the box" improves and extending-the-box opportunities are identified. So far the Orbiter has operated generally within the box.

Too Young For Retirement: Each remaining Orbiter has many missions and years of life remaining. The Orbiter was designed for a one hundred mission life with a factor of four (i.e. 400 flight potential). It has experienced low flight rates and has not been structurally overloaded (maximum loads occur during the boost phase and high wind shear situations have been avoided through pre-flight meteorological observations) and receives a complete examination and any necessary refurbishment between each flight.

The System is Safe for Continued Man Flights: No critical failures have originated from within the triply redundant Orbiter itself but like any spacecraft designed for light-weight, it is vulnerable to abuse (e.g. SRB O rings, ET insulation debris); these are now known and addressable problems. The Space Shuttle Main Engines (SSME)s were my principal safety concern through the development years but their flight record has been excellent and it may be that the integrity of recovered, refurbished rocket engines is as good as or even better than new ones. Some rocket engine incipient failures may lie undetected in ocean graves.

Real Usability Through "Landing With Dignity": Turnaround man hours are costly for the Orbiter, not the least demanding being the heat shield preparation and changes are continually being made to improve the situation. Even so, this relatively light-weight, first generation radiant heat shield is itself reusable and obviates having to pay for a new vehicle and other ancillary costs such as ocean recovery for every flight. Note: In depth reviews of "flown" Apollo command modules concluded that second flights of the hardware would be too costly at that time.

New Space Initiatives Depend On The Orbiter For Identification and Pursuit: The on-orbit assembly option for a deep space manned system became more viable upon completion of the International Space Station (ISS) using the Orbiter. An "Orbiter" segment of a deep space system would be used in assembly activities, on-orbit transfers, tug functions and most importantly for the crew Earth-to-orbit and orbit-to-Earth transfer. Reliance on an Orbiter for re-entry would eliminate configuration constraints on size and shape and the weight of items such as parachutes, heat shields and landing impact structure and the energy needed to transport this otherwise useless added weight throughout the entire deep space mission. This approach essentially would trade-off these advantages against the development of an additional propulsion module for return from deep space to high/low Earth orbit. The present Orbiter would be a key mechanism in the early development of such an on-orbit assembled system.

The Shuttle Continues to Be An Intriguing Candidate For "Commercialization": The system is presently operational. Its payload-to-orbit delivery and other capabilities are well documented. Its risks are known and assessable for payload insurance and crew-safety considerations and industrial elements are already doing much of the work in many areas. Bailing, leasing and/or other type of agreement for use of government equipment (Orbiters, pads, control centers, etc.) is probably feasible in some arrangement. Needed is an industry, NASA-government, Congressional meeting of the minds on all related elements including government flight requirements, (e.g. ISS servicing) and commercial pricing policies. If such a government hand-off to industry could be affected it would, of course, keep the Shuttle Program available for another decade or two should presently unforeseen government needs arise (even today it would be most helpful to have Apollo supply and rescue vehicles that serviced Skylab available for use on the ISS).

U. S. Taxpayers Have Not Yet Realized Their Full Return-on-Investment (ROI) From the Shuttle System:

+ It really works; it is not just a briefing chart promise.

+ It has much life remaining and could be the key to the identification and development of new systems.

+ It is man-rated and safe--probably as safe as any manned system will be-no others will get over one hundred flights down the learning curve.

+ The infrastructure is in place and operational and has provided industry through extensive, hands-on participation with the depth of training necessary to assume total system accountability.

+ To replace the Orbiter capabilities will take decades and billions.

Decommissioning the Space Shuttle should be postponed indefinitely.

George W. Jeffs is the former President of Space and Energy Operations [including Shuttle Orbiter, Integration and Space Shuttle Main Engines (SSMEs)] at Rockwell International. He is also the former President of the Space Division, North American Aviation-Rockwell International [including Apollo Command and Service Modules and the Space Shuttle Orbiter]. He is also a helicopter and fixed-wing pilot with multiengine and instrument ratings.


Related Links
Space Analysis and Space OpEds

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks DiggDigg RedditReddit GoogleGoogle

Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

Building a Heavenly Palace in outer space
Moscow, Russia (RIA Novosti) Apr 29, 2011
China's permanent space station, the Heavenly Palace, is to be launched into orbit within a decade. According to Chinese media reports, the 60-ton craft will include a central module and two laboratories, for a crew of three. So, it's really more like a country cottage than a palace. This all-Chinese project was unveiled earlier this week in the capital, Beijing. To the public at home, the ... read more

A Wrinkly Old Reveal Clues To Its Past

MoonBots Challenges Teams to Conduct Lunar Missions with LEGO Robots

Earth's Nearest Neighbor Within Reach

Space Adventures proposes modified Soyuz TMA for Lunar tourists

Opportunity Cracks The 18-Mile Mark

Mars Science Laboratory Aeroshell Delivered To Launch Site

Mars Express Sees Deep Fractures on Mars

Opportunity Images Small Craters

NASA Announces Its First Payloads for Commercial Suborbital Spacecraft

Heaven is a 'fairy story': Hawking

Putting the Common Housefly onto the dinner plate

JPL Facility has Built Famed Spacecraft for 50 Years

Top Chinese scientists honored with naming of minor planets

China sees smooth preparation for launch of unmanned module

China to attempt first space rendezvous

Countdown begins for Chineses space station program

The Sabatier System: Producing Water on the ISS

Andrews Space Delivers Cargo Module Power Unit for Orbital's Cygnus Spacecraft

ISS orbit to be readjusted for Soyuz TMA-20 return

Soyuz is in the launch zone at Europe's Spaceport

Preparations for third Ariane 5 mission of 2011 move into their final phase

Another Ariane 5 begins its assembly at the Spaceport

ST-2's installation on SYLDA marks the start of final payload integration for Ariane 5's next mission

Arianespace to launch ABS-2 in 2013

Study suggest water on distant planet

Endeavour flies to ISS for the last time

Haumea Shines with Crystalline Ice

Flipping Hot Jupiters

How to control complex networks

Mixing fluids efficiently in confined spaces: Let the fingers do the working

Raytheon Receives Contract to Produce Additional APG-79 AESA Radars

Shaking down frozen helium: In a 'supersolid' state, it has liquid-like characteristics

The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement