Of the 21 B-2 Spirit bombers built for the US Air Force, only 19 are still operational—and the Air Force has gone to tremendous lengths to keep them that way!

The B-2 Spirit, tail number 93-1086, “Spirit of Kitty Hawk,” will soon be back in operational service, the United States Air Force announced on Saturday. The aircraft, which completed its scheduled Programmed Depot Maintenance (PDM) at Air Force Plant 42 in Palmdale, California, made a return flight and arrived at Whiteman Air Force Base (AFB), Missouri, earlier last week.

Whiteman AFB is home to the 509th Bomb Wing—and the entire fleet of operational B-2 Spirit stealth bombers. The aircraft have historically operated from the base on “CONUS-to-CONUS” missions—many-hour missions that start and end in the United States, allowing the bombers to remain well out of range of potential threats to forward airbases. 

“The bomber’s return marks the culmination of an extensive depot maintenance designed to preserve structural integrity, restore advanced coatings, and ensure the stealth platform remains mission ready,” the Air Force said.

About the B-2 Spirit Stealth Bomber

• Year Introduced: 1997
• Manufacturer: Northrop Grumman
• Number Built: 21 (19 still operational)
• Length: 69 ft (21.0 m)
• Wingspan: 172 ft (52.4 m)
• Weight (MTOW): ~336,500 lb (152,200 kg)
• Engines: Four General Electric F118-GE-100 turbofans (~17,300 lbf thrust each)
• Top Speed: ≈630–650 mph (~1,010–1,045 km/h) / ~Mach 0.95
• Range: ~6,000 nmi (6,900 mi, 11,112 km) unrefueled (intercontinental with aerial refueling; global reach)
• Service Ceiling: ~50,000 ft (15,240 m)
• Loadout: Internal weapons bays; roughly ~40,000 lb (≈18,000 kg) of ordnance — nuclear and conventional mission sets (B61/B83 certified historically), precision-guided bombs (JDAM, SDB), and select standoff munitions depending on loadout
• Aircrew: 2 (pilot and mission commander)

Every Bomber Counts—Especially If It’s a B-2!

The return to service of the “Spirit of Kitty Hawk” is significant, given how few of the aircraft remain in the US airfleet. 

Northrop Grumman produced a total of 21 B-2 aircraft, including a flight-test prototype—the “Spirit of America”—which was later updated and brought into the active operational fleet. Two of the production models—AV-12, the “Spirit of Kansas,” and AV-20, “The Spirit of Hawaii”—were lost in mishaps, leaving the service with 19 of the stealth bombers.

Given that the B-2 is the only in-service aircraft capable of carrying the massive 30,000-pound GBU-57 Massive Ordnance Penetrator (MOP), the US Air Force needs each and every Spirit!

“The B-2 is a small fleet,” said Lt. Col. Jeffrey Lembrick, Air Vehicle and Systems Management (AVSM), Materiel Leader with the B-2 Program Office, in the Air Force’s media statement. “Every time we return a jet to the field, it represents an additional strategic option available for the President of the United States. When you talk about aircraft availability, one thing we know is that a jet can’t be used if it’s sitting at PDM. So, completing PDM and returning to the field is a big deal.”

How Does “Programmed Depot Maintenance” Work?

The PDM is conducted on a structured calendar or operating-hour cycle, and with the B-2 Spirit, each bomber undergoes the process once every nine years. It is a required but time-consuming process that ensures the aircraft remains in top flight condition. The work is so extensive that it must be performed at a specialized depot-level facility, rather than at the aircraft’s regularly operational base.

In the case of the Spirit, the bomber was dismantled—either partially or near-completely depending on what inspections find—and technicians review the internal structural elements, wiring, fuel systems, and engine bays for hidden corrosion, fatigue, and other wear. It requires the extensive stripping and then reapplication of the B-2’s highly specialized Low Observable (LO) radar-absorbent materials, specialized paint, and thermal-acoustic seals.

During the PDM, the “hot trailing edge,” a critical structural assembly section designed to allow the aircraft to withstand the extreme thermal and acoustic fatigue that is generated by the Spirit’s four engines, is also replaced.

Other issues are identified and resolved as they appear, ensuring that the bomber is in the best condition possible since it first entered service. In addition, during the PDM, aircraft can receive upgrades to the avionics, communication, and combat systems.

B-2 Spirit Fleet to Keep Flying Well into the Future

Current plans call for the US Air Force to operate the fleet of B-2s as the new B-21 Raider long-range bombers enter service, with the Spirits likely remaining in the sky at least into the late 2030s or early 2040s.

The recent PDM was managed by Northrop Grumman Corporation, the prime contractor on the B-2 as well as the B-21 Raider, at the direction of the Air Force Life Cycle Management Center’s B-2 Program Office.

“Depot maintenance is designed to find and fix issues before they ever affect a mission, and this cycle proved how robust our inspection process really is,” said Cindy Conner, AVSM Deputy Branch Chief in the B-2 Program Office. “When we encountered any surprise issues, the PDM team didn’t miss a beat. By executing a strategic part swap with an incoming aircraft and manufacturing an additional replacement part right on-site, they kept the schedule moving and returned a combat-ready aircraft to the fleet.”

With Spirit of Kitty Hawk back at Whiteman AFB, it will soon transition to the 509th Bomb Wing’s “modification line,” where it will “receive advanced LO and communication upgrades,” which will allow the B-2 to serve as the “most technologically advanced bomber in the world,” at least until the B-21 Raider arrives.

About the Author: Peter Suciu

Peter Suciu has contributed to dozens of newspapers, magazines, and websites over a 30-year career in journalism. He regularly writes about military hardware, firearms history, cybersecurity, politics, and international affairs. Peter is also a contributing writer for Forbes and Clearance Jobs. He is based in Michigan. You can follow him on Twitter: @PeterSuciu. You can email the author at Editor@nationalinterest.org.

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