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Edited by Christian Lowe | Contact

PCADS Fights Fires

PCADS-Photo.jpg

Each year, several squadrons of C-130 aircraft are readied for firefighter duty: the 145th Air Wing from Charlotte, N.C., 146th Air Wing from Point Hueneme, Calif., 302nd Wing of the Air Force Reserves from Colorado Springs, and the 153rd Airlift Wing from Cheyenne, Wyoming. The mission has been limited to these few squadrons because there are only eight of the Mobile Airborne Firefighting System (MAFFS) available for these units to use to rope in wildfires.

But other military transport squadrons could lend them a hand in the near future. Boeing and Weyerhaeuser, working with Flexible Alternatives and ICL Performance Products, have come up with a new firefighting system that recalls an era when the mighty 8th Air Force carpet-bombed objectives. The system has been labeled "PCADS," which stands for "Precision Container Air Delivery System."

“We’re enabling [the military] to carry out their existing mission of aerial delivery without endangering the crews or the airplanes, while providing a higher level of [firefighting] effectiveness”, said Rick Goddard, Director of Sales in Weyerhaeuser's Bulk Packaging Group and a former Marine aviator. “If you can provide a solution that is more effective, both in cost and on the ground, that is consistent with the tools and training [of the military], and is better for the environment [than current firefighting chemicals], look at the benefits.”

PCADS is basically a 4-foot cubic box with a biodegradable bladder inside. The package can be loaded onto any number of military transport planes (16 onto a C-130, 70 onto a C-17) and rolled out the back over a fire per the SOP for performing food drops. The lid of the package flies upward, pulling on straps that rip the bladder open, spilling water, fire retardant, or firefighting gel into the air.

“PCADS separates the aerial firefighting system from the delivery aircraft”, said William Cleary, an Advanced Systems Project Manager for Boeing in Long Beach, California. “It allows for safe delivery day or night while utilizing aircraft delivery systems to ensure aerial firefighting accuracy.”

And one of the biggest assets to the program is that it is a mission familiar to transport crews across the military. “PCADS is a technology that can be modified or changed with little or no cost to the consumer, which compares well when considering a fixed aerial asset such as an air tanker or modular mechanical system”, said Ty Bonnar, Vice President of Simi Valley-based Flexible Alternatives and PCADS Director of Operations. “PCADS is simple but effective technology which can be used on various aircraft, including the C-130, C-27, IL-76, and C-17 – basically any platform with a ramp and cargo bays.”

Bottom line: PCADS increases the number of aircraft capable of fighting wildfires. “The PCADS project is an exciting development as an alternative aerial firefighting application approach”, said Gordon Springell, Gel Business Leader for ICL Performance Products. “With the use of Phos-Chek Aqua Gel-K, as seen during the recent Kingman trial, the enhancement of the water medium [with gel] improves, quite dramatically, the PCADS drop characteristics, and retention of moisture on the ground, and, therefore, the ability to extinguish burning fuels on forest fires, especially in direct attack.”

Go here to see a video and a more detailed description of the PCADS system.

-- Michael Archer

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Posted by: dsgfh at June 11, 2008 10:46 AM


I would like to briefly respond to Eric Daniel's comments on the recent article.
The Kingman, AZ trial was conducted with our new product, Phos-Chek AquaGel-K: which is principally designed, in aerial applications, for direct initial attack, wet-lines close to the fire and for structural protection.
Although coverage level (CL) is critical in firefighting applications, dependent on the 'target' fuel model: Phos-Chek was invited to this trial, in order to assess the unique characteristics and properties of Phos-Chek AquaGel-K with the innovative PCADS system.
It was important to establish that the enhaunced (gelled) water medium reached both the ground (without high rate evaporation), hit the 'target' and effectively covered a specific surrounding area around the 'target' zone.
Quantity of medium was therefore not a specific consideration in this particular trial. CL is directly proportional to the number of PCADS units dropped, aircraft altitude, meteorolgical conditions, etc.,.
Measuring the coverage level (CL) on the dry lake bed was made easier because of "shadows" created by cardboard debris, which reached the ground before the "gel cloud". Consequently, a measure of circa CL2 was established over the main footprint, measured over 1000' length x approximately 140' width @ 750' aircraft altitude, with 5 only PCADS.
Other tests @ 500', 750' & 1000' were made to establish CL, footprint size & pattern and drift characteristics.
It was important to establish that in the direct initial attack application, that the deployment of the PCADS system with Phos-Chek AquaGel-K would be effective and efficient: and be unique as not to duplicate existing conventional modes of aerial firefighting.
Furthermore, the possible use of PCADS during night time operations, at higher altitude levels, when (more often than not), wildfires tend to be at their quietest phase: and when most ground crews are "off the fire-ground": could have great value and better effective eradication of sectors of any particular wildfire incident.

Posted by: Gordon Springell at October 16, 2007 04:32 PM


Well there you go. Thanks for the update.

Ok, now for some additional questions.

The majority of my experience was in Region 6 (Oregon and Washington), Region 5 (California) and Region 4 (Nevada, Utah, southern Idaho and western Wyoming) so except for my trips into the Nevada grasslands, I’ve been mostly in big timber in steep terrain. If you’re looking at employing this system in a direct attack role, how does canopy density affect the dispersion pattern and retardant penetration. Having observed conventional tanker drops, they will go for the “big slug” approach for direct attack and canopy penetration, so I’m curious if your system would be capable of getting enough mass out the door (as it were) to achieve the same effect? Also, since it appears that you have to follow a pretty specific flight pattern (500-750 AGL) for your drops, what effect will mountainous terrain have on your ability to get a good pattern on the target? While I imagine there’s no reason why you can fly a terrain following pattern (up slope, down slope, cross slope) like a conventional tanker, what effect does being “out of plane” have on the loadmaster and the load while trying to get it out? Are the boxes ejected manually or is there a mechanical system involved (I can’t imagine some poor airman trying to push one of those out “uphill” while the aircraft is making a down-slope pass.)

In the original article it mentions a day/night deliverability capability. When last I was a dirt beetle (2000) USFS fire aviation policy specifically prohibited night ops for air assets (fixed wing, rotary wing, or UAV) for obvious safety reasons. Has this policy changed? Obviously, there is no reason why you couldn’t push these boxes out the door at night, or why a conventional tanker couldn’t make a drop, other than the fact that the pilot can’t see the lead plane in front of him or the terrain he’s flying over. Just curious.

Finally, if you’re looking at using this in the direct attack role, what restrictions, if any, are there with respect to dumping near hand crews or other ground assets. Obviously an air tanker is not intentionally going to “attack” a hand crew, but I have been slimed often enough (actually, I got hit twice immediately after getting to my first fire (I hadn’t even gotten my line gear on yet)) to accept getting slimed as an occupational hazard while cutting hot line. I’m just curious what becomes of the boxes after they dump their contents? Are they a hazard to crews below or do they loose sufficient mass ( i.e they tear apart in flight) so that they don’t represent a falling hazard to hand crews?

One definite advantage I see in your system over other conventional tankers is loiter time and spot fire management. In Nevada I saw a lot of SEATs (single engine air tankers – like the Air Tractor 802) working spot fires. While the 802 was awesome for what it did - it’s maneuverable and it’s accurate, its downside is it’s only got one shot. After it dumps it’s got to RTB. It also has relatively short legs. With your system, not only can you hit a spot fire, but if you miss you can turn around and hit it again, and then move on to the next spot fire.

Posted by: Eric Daniel at October 16, 2007 03:33 PM


Firstly, thank you for all your comments, we love to hear comments and feedback on this project. I have been reading your postings and would like to answer some of the questions you have posted. As the article states I am the Director of Ops for this project; our goal is to add a safe cost-effective tool to the already strained and limited air programs that exist today. The basis of this program is to equip standard air cargo platforms with fire fighting capabilites that allows them to at fly at safe altitudes. ANG crews are trained in air drops and this system is simply cargo that gets dropped over a fire. This last test was set-up to test the PHOS-CHEK Gel as opposed to retardant or water - the coverage levels that we saw were excellent and this is according to PHOS-CHEK and other groups that were present. Our approach is that of direct attack - not containment - we feel that direct attack is best for this system due to accuracy and coverage levels that gel provides. Rate release can be varied due to the strap length, deployment timing and altitude - currently we are flying 500 AGL to 750 AGL for the best coverage using the gel product. Load times - we see the units being loaded by ANG or professionals in a C-130 less than 15 minutes using K-loaders. The unit rolls easy on - easy off - we have performed many tests over the last 5 years - opertional and in-house to ensure that this system is user freindly. With the Direct Attack approach we see this system filling a void that currently exisits, as well as reducing the duration of the fires life reducing the envrionmental impacts. We fully understand that the ground crews are the effective force and we want provide them a safe air alternative when air resoruces are needed. Thank you for your interest and comments.

Posted by: Ty at October 16, 2007 01:52 PM


Eric: Thanks for the feedback. Always nice to hear from someone who's BTDT.

.22lr: Flaming is for trolls.

Didn't say I believed in global warming; I'm not 100% sure on it, either way. I AM 100% sure that YOU don't know the answers. You're a high school kid, and you can't spell. If it's all the same to you, I'll trust scientists on the issue.

Welcome aboard. I understand that you're joining the Air Force soon. Well, thank you for your service, and here's a kind word to get you started on the right footing: if you treat somebody in your barracks like you've treated me, he's going to piss in your boots.

Behave yourself.

Posted by: demophilus at October 15, 2007 02:35 PM


.22lr, I won't even bother trying to cite the volumes of information available out there on that particular subject. I'm definitely what is called a "liberal-hater" so don't lump me in with those folks either.

I rather enjoy reading most of your other posts but PLEASE work on your spelling, it is an embarrassment.

Posted by: Takeo at October 15, 2007 01:24 PM


LOL, wow Demophilus. I didn't now a person of at lest some intelligence believed in Global Warming. I mean gosh maybe you just sounds smart in your writing cus, you would be the first person I know of who knows a lot about a lot of stuff, to believe Gores pile of Horse Manure. I look at hard facts, and last year Indiana had a very harsh winter, and it got down to the 50s last week. Heck maybe we are having Global Cooling. Fact is no body can prove anything but that Global Warming just inst real. O well maybe your a Liberal Democrat in which case why are you reading this site.

Posted by: 22lr at October 15, 2007 09:38 AM


Ok, as a former USFS wildland firefighter, let me weigh in on this.

It does appear to be a novel approach to retardant delivery. I would imagine the boxes are relatively cheap to purchase, and I assume they are loadable (fillable rather) at the airfield, which would allow you to tailor the load to meet requirements (Phos-check, water, water and soap, what have you.) This system also allows you to use it on any stern-ramp equipped aircraft as well, so you have quite a bit of flexibility in selecting “tanker” aircraft.

My only concern though, would be the quality of coverage. You don’t use retardant to put out a fire generally (the exception to this is when you have that fortuitous situation where you have a plane-full on hand and the fire is relatively small and close by, and can be slimed in a single run) but rather you use it to either slow down the flame front of an advancing fire, to allow ground resources (hand crews, engines, and dozers) to punch in a fire line in front of the fire, or to lay “redline” between existing handlines (this usually occurs when there are gaps between existing fire lines on account of impassable or dangerous terrain.) In these situations, it’s an absolute must to have uniform and complete coverage.

Also, I wonder how flexible the system is when it comes to rate of release. With MAAFS you can govern the rate of release to create a thin line or a fat one. With this system you can only control the rate at which the boxes go out the door, which basically means you can only control how close the “bombs” land next to one another. While I’ve no doubt that this system could put a big load of retardant on a target, I’d be more concerned about its “thin line” capabilities.

Another question I have is load time. It takes 4 hours to convert a stock C-130 to MAAFS duty; after that, you’re only on the ground long enough to re-load the 4,000 gallon tank (min. USFS refill requirements are 500gpm per intake valve and the MAAFS has two valves, for a potential load time of 4 minutes.) I would imagine that these boxes get filled on the ground, and then loaded into the aircraft, which means they’ll have to use a forklift to get it on the ramp, and then manhandle them into position and then secure them to the deck. I can’t see this happening in less than 30 minutes, unless the aircraft were equipped with some sort of automated cargo positioning and securing system (and I’ll be the first to admit I don’t know if the current fleet of C-130s is equipped with these, but I haven’t seen one.)

I guess my bottom line "outside looking in" assessment would be, it’s certainly cheaper, more deployable (on different aircraft and different locations) and more numerous than the existing fleet of MAAFS systems, but I don’t know that it’s better. Time will tell I suppose.

Posted by: Eric Daniel at October 15, 2007 08:45 AM


I'm sorry, two-two -- I didn't realize we had a climatologist aboard. My mistake.

Posted by: demophilus at October 14, 2007 12:56 AM


None of global warming is true, so we don't have to worry about that one. I never thought of that but you have a great idea there, heck they have to fly sometime.

Posted by: 22lr at October 13, 2007 12:11 PM


A ro-ro system for turning stern ramp freighters into firefighters has always struck me as a good idea. Good to see someone taking it a step further.

Something about this system seems an interim step, but it's definitely a step in the right direction. At the very least, it seems like a system that's adaptable to different substances -- i.e., you can drop anything that would stop a fire. Might also work for dropping other environmental packages.

It makes sense, too. The guys and gals in the Reserves and Guard gotta do their hours to stay current in their birds. Something like this seems more interesting than dicking around in the pattern, doing touch and goes. And, if half what we're told about global warming is true, the fires are only going to get worse.

At the end of the day, there's more to national security than fighting wars. Even that's a form of putting out fires.

Go, team, go.

Posted by: demophilus at October 13, 2007 12:32 AM


Cool, i assume its a lot more costly than a regular fire tanker, but thoos cant land, and then go airlift supply's to the firefighter FOB.

Posted by: 22lr at October 12, 2007 05:58 PM


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