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KC-46A Pegasus Aerial Tanker Completes Firsts

Mar 15, 2021 04:56 UTC by Defense Industry Daily staff

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KC-46A concept

March 15/21: OBIGGS A category 2 deficiency for the KC-46A aerial refueling tanker is prevent pilots from taking off in the tanker until the On-Board Inert Gas Generation System (OBIGGS) countdown timer reaches zero. OBIGGS will fill the fuel tanks with nitrogen to prevent the tanks from exploding if there is residual fuel inside. Maj. Tim McBride, an instructor pilot with the 931st Air Refueling Wing, told Defense News that the system take on average 1.5 hours to be ready. But occasionally, the countdown timer will reset and that increased the waiting time. To fix the issue, the service has decided to amend the flight manual so that the flight crew can now take off even if the OBIGGS is still counting down. This will be implemented next month.

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KC-135: Old as the hills…
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DID’s FOCUS articles cover major weapons acquisition programs – and no program is more important to the USAF than its aerial tanker fleet renewal. In January 2007, the big question was whether there would be a competition for the USA’s KC-X proposal, covering 175 production aircraft and 4 test platforms. The total cost is now estimated at $52 billion, but America’s aerial tanker fleet demands new planes to replace its KC-135s, whose most recent new delivery was in 1965. Otherwise, unpredictable age or fatigue issues, like the ones that grounded its F-15A-D fighters in 2008, could ground its aerial tankers – and with them, a substantial slice of the USA’s total airpower.

KC-Y and KC-Z buys are supposed to follow in subsequent decades, in order to replace 530 (195 active; ANG 251; Reserve 84) active tankers, as well as the USAF’s 59 heavy KC-10 tankers that were delivered from 1979-1987. Then again, fiscal and demographic realities may mean that the 179 plane KC-X buy is “it” for the USAF. Either way, the KC-X stakes were huge for all concerned.

In the end, it was Team Boeing’s KC-767 NexGen/ KC-46A (767 derivative) vs. EADS North America’s KC-45A (Airbus KC-30/A330-200 derivative), both within the Pentagon and in the halls of Congress. The financial and employment stakes guaranteed a huge political fight no matter which side won. After Airbus won in 2008, that fight ended up sinking and restarting the entire program. Three years later, Boeing won the recompete. Now, they have to deliver their KC-46A.