The fall and rise of the 747 Supertanker

MikeD

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The 747 supertanker firefighting aircraft will be making a comeback, of sorts, for combatting wildland fires.

Originally conceived by Evergreen Aviation here at KMZJ, the Evergreen Supertanker was a program to convert up to 4 of Evergreen Airlines' 747-100/200 freighters to firefighting planes known as VLATs, or Very Large Air Tankers, and sporting a 20,000+ gallon water/retardant capacity (as compared to 12,000 gallons of the DC-10 VLATs). Evergreen converted one 747-200, N470EV as Tanker 947 and operated it in the test and operational role overseas fighting fires in Israel. Then the systems were transferred to a company 747-100, N479EV as Tanker 979, and it completed fire seasons in California; before the US Forest Service decided not to contract the 747 any longer due to cost. The program slowed down, never had its fleet of four 747s, and eventually went defunct when Evergreen declared Chapter 7 bankruptcy a few years back. Tanker 979s sister 747-100/200s are awaiting the scrap heap here at MZJ, and Tanker 979 was placed out to pasture to await its fate.

Just very recently, several individuals involved in the former Evergreen program, including engineers and pilots, have resurrected it in the form of GlobalSupertanker Services. They have acquired a former JAL 747-400CF to convert, and will be removing the system out of N479EV/979. Tanker 979 is now on the MZJ main ramp, pulled from pasture, to have its tanking/drop systems removed and prepared for transfer. Following that, 479EV will likely join it's sister 747 classics on the scrap side of the airfield here. But the 747 will be returning to the skies as a firefighting asset, to be based at KCOS in Colorado.

Story here:

http://gazette.com/colorado-springs...efighting-aircraft-in-country/article/1557267

Tanker 979/Supertanker here:



Sister ships that were never converted: (photos by MikeD)

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This makes me so happy. I've kicked myself for not seeing the other one fly. Seeing the 747 super tanker and the Martin Mars are on my bucket list.
 
This is just excellent news. Supposedly there is one sitting up at VCV which will be retrofitted and have it's C check there. (according to a Fire Aviation site that I look at from time to time- it's a pretty decent site if anyone is interested: http://fireaviation.com/ ) I really hope they are successful in this this new venture. From their site:

"The company that developed the original STC for the SuperTanker, Adaptive Aerospace, will be providing an amendment to cover the new installation and improvements in the retardant dispensing system that will be added. Jim Wheeler, President and CEO of Global SuperTanker Services, said they expect the STC to approved by the FAA by October, 2015. After testing and crew refresher training, a new grid test will be performed this fall.

The retardant is forced from the aircraft by compressed air using the same principle seen in the transportable Modular Airborne FireFighting System (MAFFS) that can be installed in a few hours into C-130s operated by the military. Unlike the newest version of the MAFFS2 which has two on-board air compressors, the SuperTanker will rely on suitable air compressors to be pre-positioned at an air tanker base. When MAFFS are deployed they meet up with one of the six specialized air compressor systems managed by the U.S. Forest Service that can refill the air tanks in 14 minutes when the on-board compressors fail to work properly, which is not uncommon according to a MAFFS crew member we talked with.

Mr. Wheeler told us they will consider installing an air compressor in a year or so.

The first generation MAFFS1 units, no longer used, did not have onboard air compressors and were refilled on the ground. The contracts for the MAFFS2 units specified that the air tanks had to be refilled by the onboard air compressors in no more than 30 minutes. It actually takes 15 to 20 minutes to refill them while airborne.

Mr. Wheeler said in a news release, “The current worsening trends in wildfires globally demand more capable response tools. The Boeing 747-400 represents a modern, strong, high performance platform capable of flying more than 4000 nautical miles at a cruise speed of 565 miles per hour, at pressurized altitudes, fully loaded, then directly deploying nearly 20,000 gallons of a range of liquids including retardant, water, gel and foaming agents.”

I remember well when they used these birds in the huge Oak Glen fire a few years back. I think it was based up at MCC at the time.

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This problem of not enough tankers to meet demand would be solved if the USFS funded development. Instead, they're asking firms to make $20M gambles....
 
So the 747 can carry more than other aircraft. Is the advantage that it can poop more all at once, or poop in more places in one sortie, or flexibility between those two extremes?
 
@MikeD will certainly know more than I do, but yes it can make multiple drops on one flight, has a much longer range obviously, and can produce a wider (football field in width), longer pattern of water or chemicals. It can for example, lay down a strip of retardant three miles long or can drop its load in segments, putting out hot spots without needing to discharge it all at once. That's exactly what she did in the Oak Glen fire.....it made three passes as I remember and just blanketed a huge area with retardant keeping the fire from spreading.
 
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So the 747 can carry more than other aircraft. Is the advantage that it can poop more all at once, or poop in more places in one sortie, or flexibility between those two extremes?
I have no idea about the 747 but the guy I know on the DC-10 says they can do it either way.
 
I live very close to MCC and totally nerd out during fire season as the bigger tankers making left traffic for 16 fly over my house. Its such a hodgepodge of aircraft- c130 MAFFS, md 80s, dc-10, bae 146, s2s, p3s, plus a couple models that I don't recognize. There's some kind of twin that has radial engines that sound incredible. Looking forward to seeing the 747 again. /airliners.net
 
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