The U.S. Air Force is changing the way it inspects, maintains and repairs the B-1B based on initial results from full-scale fatigue testing, but the service does not anticipate any major structural life extension to keep the “Bone” fleet flying through 2040.
B-1B wing and fuselage testing are being carried out by
in Tukwila, Washington. The same company also is putting the airframes of the Air Force’s
/D Eagle and F-15E Strike Eagle through their paces in St. Louis.
The B-1B entered service in 1986 and the Air Force retains an active inventory of 62 aircraft assigned to squadrons at Dyess AFB, Texas, and Ellsworth AFB, South Dakota. So far, of those aircraft, 32 have been modernized through the Integrated Battle Station upgrade process at Tinker AFB, Oklahoma.
In 2012 and 2013, Boeing began fatigue testing the wing and fuselage, respectively, to validate the predicted life of the B-1B, which at the time was forecast to fly through 2050.
With 72% of wing testing and 20% of fuselage fatigue testing now complete, the Air Force estimates the B-1B can operate through 2040 without needing an expensive life extension.
Brig. Gen. Michael Schmidt, the Air Force’s program executive officer for fighters and bombers, says B-1B testing is extremely important and helps identify which parts of the swing-wing supersonic bomber need closer inspection and which need repair or replacing, and in what timeline.
“As of right now, we don’t plan a fully fledged life extension,” Schmidt confirmed during a Sept. 25 interview.
Like the Boeing B-52 and
B-2, the B-1B was built tough and will fly longer than expected without needing new wings or other major structural upgrades, like smaller fighters and attack aircraft. The B-1B was originally designed to fly 9,681 equivalent flight hours. But data provided by the fighters and bombers directorate at Wright-Patterson AFB, Ohio, shows it lasting far longer. The projected service life of the B-1B, originally built by Rockwell and acquired by Boeing, will reach 19,900 equivalent flight hours, the service says.
There are no plans to conduct fatigue testing or a life extension on the nuclear-armed B-2, the nation’s largest low-observable stealth aircraft, introduced in 1997. “Structurally, the program is great,” Schmidt says. “We don’t have full-scale fatigue testing going on in that platform, and it’s really not required.”
But parts obsolescence is a serious concern for the B-2 fleet, since only 21 aircraft were built and 20 remain in active service. New parts often need to be custom built.
The B-1B doesn’t carry strategic nuclear weapons, but has more payload capacity for guided and unguided weapons than any other aircraft in the U.S. inventory. B-1Bs stationed at Andersen AFB in Guam frequently fly to the Korean Peninsula in response to missile and nuclear warhead tests by Pyongyang.
The Boeing-led Integrated Battle Station is the largest single upgrade of the B-1B since it entered service, improving the front and aft cockpit and introducing a new diagnostics system and Link 16 data link to improve situational awareness and communications for the “Bone” crew.
The B-1B was the first aircraft to carry
’s extended-range AGM-158B Joint Air-to-Surface Standoff Missile, and Schmidt notes that it is now the threshold platform for the Navy’s new AGM-158C Long-Range Anti-Ship Missile (Lrasm). The B-1B tested Lrasm against a maritime target at the Point Mugu Sea Range in August, and Schmidt says another test is expected in November. Lrasm will enter service on the B-1B next year, followed by Boeing’s
/F Super Hornet in 2019.
The B-1B is receiving the
Multifunctional Information Distribution System-Joint Tactical Radio System (MIDS-JTRS) terminal for improved communications and networking. The bomber will be upgraded with Mode 5 Identification Friend-or-Foe and Automatic Dependent Surveillance-Broadcast (ADS-B Out) to meet the
’s NextGen air traffic mandates.