Air pipes

The US Air Force replaces the exhaust pipes of a B-2 bomber

The US Air Force replaces the exhaust pipes on the Northrop Grumman [NOC] The B-2 Spirit stealth bomber as part of a follow-up effort to fill the void started a decade ago.

Each of the 20 B-2s stationed at Whiteman AFB, Mo., has four General Electric [GE] F118-GE-100 turbofan engines. The Air Force deployed the first B-2 in 1993.

Air Force Materiel Command’s (AFMC) 424th Supply Chain Management Squadron at Tinker AFB, Oklahoma, has begun purchasing liners and other parts to protect hose parts exhaust about a decade ago and is now looking to replace the mid and rear covers for the exhaust outlets. The AFMC also plans to repair the B-2’s forward ducts and exhaust mixer.

Quoting the open solicitationNorthrop Grumman referred questions about the exhaust pipes to the Air Force.

“In an effort to complete a full fleet replacement, 424 Supply Chain has been pursuing a Phase III approach to reduce the impact on working capital,” the AFMC said Oct. 28. “We are currently buying 50 EAs [each] HL [left-hand] & 50 EA HR [right-hand] complete assemblies. We already have phase I on contract which was for 13 EA LH & 13 EA RH which includes a first article. Phase II is in audit with [the] DCAA [Defense Contract Audit Agency] for 15 EA LH & 15 EA RH, Phase III is on its way to DLA [Defense Logistics Agency] contract for the rest – 23 EA LH & 23 EA RH. All sub-assemblies purchased from 2011 onwards were the “pass-through” plan to keep the exhaust pipes on the fender until complete assemblies could be purchased and delivered.

Heat-resistant superalloy Inconel and high strength-to-weight ratio metallic titanium make up the exhaust ports.

To help protect the aircraft from detection by surface-to-air missiles, the B-2’s exhaust nozzles are mounted on top of the aircraft and cooling vents reduce the temperature of the engine’s exhaust. ‘plane.

The B-2 first saw action in Operation Allied Force against Serbia in 1999 and has also seen service in Afghanistan, Iraq and Libya, where it destroyed Islamic State camps in 2017.

Northrop Grumman and the Air Force plan to unveil the B-2’s successor–the company’s B-21 Raider –in Palmdale, Calif., on Dec. 2 (daily defense, October 20). The B-21 is due to make its maiden flight next year.

The Air Force and Northrop Grumman said six of the bombers were under construction in Palmdale, and Sen. Mike Rounds (RS.D.) said in July after visiting the factory that he was “pleased to report that the B-21 is on time and on budget” (daily defense22nd of July).

Ellsworth AFB, SD, will be the first base to receive the B-21 in 2024-25.

The Air Force’s fiscal year 2023 budget request contains the first procurement funding for the B-21 – nearly $1.8 billion for the Low-Rate Initial Production Phase (LRIP).

Northrop Grumman’s bid for the B-21 included a specific amount of LRIP fixed-price planes, Northrop Grumman CEO Kathy Warden said, noting that while she can’t disclose the number of planes, “it’s a small part of the overall check-in program” (daily defenseApril 28).