C-21 aircraft queue for inspection inside Hangar 3 at Scott Air Force Base, Ill., on Sept. 16, 2010. The C-21 is a twin turbofan engine aircraft used for cargo and passenger airlift. (U.S. Air Force Photo/Staff Sgt. Ryan Crane)

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Mr. Eric Bollinger, DynCorp International contractor, checks his technical orders while working on a C-21 during a phase inspection at Scott Air Force Base, Ill., on Sept. 15, 2010. The phase inspections are done on aircraft after they reach flying milestones to ensure the aircraft remain in top condition. (U.S. Air Force Photo/Staff Sgt. Brian J. Valencia)

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Mr. Eric Bollinger and Mr. Bob Norrenberns, both DynCorp International contractors, work on a C-21 during a phase inspection at Scott Air Force Base, Ill., on Sept. 15, 2010. The phase inspections are done on aircraft after they reach flying milestones to ensure the aircraft remain in top condition. (U.S. Air Force Photo/Staff Sgt. Brian J. Valencia)

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Mr. Eric Bollinger and Mr. Steve Edwards, both DynCorp International contractors, work on a C-21 during a phase inspection at Scott Air Force Base, Ill., on Sept. 15, 2010. The phase inspections are done on aircraft after they reach flying milestones to ensure the aircraft remain in top condition. (U.S. Air Force Photo/Staff Sgt. Brian J. Valencia)

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Mr. Eric Bollinger, DynCorp International contractor, works on a C-21 during a phase inspection at Scott Air Force Base, Ill., on Sept. 16, 2010. The phase inspections are done on aircraft after they reach flying milestones to ensure the aircraft remain in top condition. (U.S. Air Force Photo/Staff Sgt. Ryan Crane)

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Mr. Joe Schein, DynCorp International contractor, works on a C-21 during a phase inspection at Scott Air Force Base, Ill., on Sept. 16, 2010. The phase inspections are done on aircraft after they reach flying milestones to ensure the aircraft remain in top condition. (U.S. Air Force Photo/Staff Sgt. Brian J. Valencia)

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A C-21 is worked on during a phase inspection at Scott Air Force Base, Ill., on Sept. 16, 2010. The phase inspections are done on aircraft after they reach flying milestones to ensure the aircraft remain in tip-top shape. (U.S. Air Force Photo/Staff Sgt. Ryan Crane)

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Mr. Dan Arens, DynCorp International contractor, performs maintenance on a C-21 landing gear during a phase inspection at Scott Air Force Base, Ill. on Sept. 15, 2010. The phase inspections are done on aircraft after they reach flying milestones to ensure the aircraft remain in top condition. (U.S. Air Force Photo/Staff Sgt. Brian J. Valencia)

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Mr. Dan Arens, DynCorp International contractor, performs maintenance on a C-21 landing gear during a phase inspection at Scott Air Force Base, Ill., on Sept. 15, 2010. The phase inspections are done on aircraft after they reach flying milestones to ensure the aircraft remain in top condition. (U.S. Air Force Photo/Staff Sgt. Brian J. Valencia)

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Mr. Dan Arens, DynCorp International contractor, tows a C-21 into a hangar for a phase inspection at Scott Air Force Base, Ill., on Sept. 15, 2010. The phase inspections are done on aircraft after they reach flying milestones to ensure the aircraft remain in top condition. (U.S. Air Force Photo/Staff Sgt. Brian J. Valencia)

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Photos: Maintaining the C-21 airlifter

Published Sept. 22, 2010