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The purpose of the Fire Mechanics Section is to promote standardization of fire apparatus and equipment preventative maintenance, improve safety standards and practices, promote workshops, conferences, and seminars related to the purposes of this Section, and to promote cost savings through standardization of building and equipment purchasing and maintenance.

RECENT FIRE MECHANIC NEWS

Posted: Apr 1, 2019

Tractor-Drawn Aerials Continue to Enjoy Resurgence

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Tractor-Drawn Aerials Experience Resurgence in Popularity


The heritage of today’s tractor-drawn aerials (TDAs) can be traced back to the late 1800s when the trailers were first given rear steering but were still drawn by horses. Horsepower (hp) today still powers TDAs but in an engine-driven form, yet TDAs, also known as tillers, retain their advantages of maneuverability, versatility, and equipment-carrying capacity.

MANEUVERABILITY

Paul Christiansen, aerial sales manager for Ferrara Fire Apparatus, says that an aerial’s maneuverability “is more important than ever before, especially where a lot of new development is in apartment complexes and downtown commercial areas where buildings are tightly packed. The maneuverability of a TDA is so much better, especially in making tight turns, than compared with a nontiller truck.”

Ferrara Fire Apparatus built this 101-foot TDA on an Igniter chassis powered by a 600-hp Cummins engine and an Allison 4000 EVS automatic transmission. (Photo courtesy of Ferrara Fire Apparatus.)

1 Ferrara Fire Apparatus built this 101-foot TDA on an Igniter chassis powered by a 600-hp Cummins engine and an Allison 4000 EVS automatic transmission. (Photo courtesy of Ferrara Fire Apparatus.)

Pete Hoherchak, product manager of aerials for KME, agrees that maneuverability is the number one advantage in using a TDA, followed by the ability to carry a large amount of ground ladders and having lots of compartmentation. “You are able to get the truck down tight streets and alleys and into tight fire scenes where you wouldn’t be able to get a rear-mount aerial,” Hoherchak observes.

KME built two 101-foot AerialCat™ TDAs for the Honolulu (HI) Fire Department on Severe Service™ LFD cabs with 18-inch raised roofs and prepiped waterways. (Photo courtesy of KME.)

2 KME built two 101-foot AerialCat TDAs for the Honolulu (HI) Fire Department on Severe Service LFD cabs with 18-inch raised roofs and prepiped waterways. (Photo courtesy of KME.)

He notes that a TDA tractor without a pump or water tank has a wheelbase of 141 inches. “Wherever the tractor can go, the trailer can follow,” Hoherchak says. And when setting up in tight spaces, the width of the jack spread is important, he says, citing KME’s 14-foot jack spread on its Read more

Posted: Apr 1, 2019

Fire Apparatus Aerial Pedestal

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Training on the Pedestal


Many fire departments across the country perform “in-house” training for pump operator and aerial apparatus driver training. If you’re lucky, your department has a training course setup that is designed to give you the operational skills needed to operate the apparatus as well as drive the apparatus.

Some departments have members go offline and report to the training academy to learn how to operate and drive the apparatus. These classes are great for larger departments that may have numerous different types of aerial apparatus (aerial, tiller, and tower ladder) because it gives the firefighter knowledge of each of the apparatus’s physical differences as well as their different tactical operations. In whatever training you provide, creating a qualified operator who can skillfully operate the apparatus while responding to and working at a fire or emergency should be our common goal.

With the onset of the computer age, we are less likely to provide all our students with handouts, and we just let them see a photo on the screen of a particular item. Sure, that works well in a lecture atmosphere, but does it really let our students learn and memorize a specific item? If your department operates a few different types of aerial and tower ladder apparatus, the pedestal can be much different. The main control levers are usually the same compared with years ago, but other switches will be in different locations. Giving your students a drawing of each apparatus’s pedestal will enable them to study the control and switch locations. Our goal in teaching students the location of the pedestal’s main control handles—extension, rotation, and hoist—is so they can operate the ladder apparatus without continually staring or glancing downward at their hand and lever position to operate the controls. This might seem trivial, but they’ll be operating these expensive apparatus when a life is at stake at a window or on a fire escape and have to operate around wires, street lights, and tree branches to reach those trapped.

LESSON ONE

So, our first pedestal training lesson should be to teach the operator the three main control handle locations and functions. The levers are three-position levers with two distinct movements from the center safety/neutral position. If the lever is either pushed away or pulled toward the operator, the lever will perform one of two functions. To learn the lever locations, we should teach the students the “E-R-H” acronym: Extend-Rotate-Hoist. The first lever, working from the left to the right, is for ladder extension and retraction; the middle lever is for rotation (left or right); and the right lever is for hoist position (raise or lower the level of the boom). Some levers may have safety mechanisms on them that must be lifted as the handle is moved or it won’t release from the neutral position. Others may have a button that must be

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Posted: Apr 1, 2019

Fire Apparatus Purchasing: Frustrating the Vendors

Apparatus Purchasing: Frustrating the Dealers


A dealer is the individual, regardless of gender, who interacts with an apparatus purchasing committee (APC) during the purchasing process. A dealer is also called a vendor, salesman, salesperson, sales representative, dealer principal, peddler, and inside sales contact. What he is called is unimportant. How he is treated is.

With few exceptions, APCs have two perceptions of fire apparatus dealers. One is a favorable opinion reserved for preferred dealers. Many APCs elevate a preferred dealer to the level of a deity. That dealer’s word is gospel—never to be doubted or challenged. It would be blasphemy to actually question him. Those same APCs have little care, concern, or use for the rest of the dealers in the Western Hemisphere—until they are needed. Not only is that hypocritical, it is frustrating to nonpreferred dealers.

Definitions of frustrating include infuriating, challenging, annoying, irritating, aggravating, and discouraging. Quite often, purchasing committees will only communicate with one or two dealers. Their reasoning is most, but not all, fire departments know whose rig they want to purchase. The rare exception is when an APC truly evaluates multiple apparatus manufacturers by meeting with their respective representatives. Some fire departments do not realize their interactions with dealers, or lack thereof, can have negative effects both before and after specifications are written. After an APC has finalized its purchasing specifications is when nonfavored vendors can really become frustrated with the process.

Purchasers should be aware that dealers they have not communicated with only have the purchaser’s written document to evaluate when deciding if they should submit a proposal. They should not hold vendors in contempt because the vendors may not understand some verbiage in their specifications. When addressing a vendor’s question, a purchaser’s inadequate written response or an obviously misleading verbal answer can be aggravating to the point that a dealer will not bid. Purchasers should realize vendors deal with the purchasing process on a daily basis and they just know when a purchaser needs multiple bids to justify a preferred purchase. They know they are being taken advantage of. Many dealers can justifiably say it is not their first rodeo or, to paraphrase an insurance company’s popular television commercial, “We know a thing or two because we’ve seen a thing or two.

THE REAL WORLD

Most apparatus vendors are paid on a commission basis. Some are salaried, and some are on a salary plus commission schedule. How much they earn is not the fire department’s business. The point is the majority do not get paid unless a sale is made. It is not unheard of for vendors to expend an untold amount of nonreimbursed hours and expenses and not get the job. It is an accepted part of the business. There is a saying that “all is fair in war and games,” and most vendors expect to lose a sale from time to time. What aggravates them is an APC not being up front and honest. Regardless of whether it is unintentional or deceitful, it is not right. Dealers are justifiably infuriated when they are lied to. That’s why many do not bid.

Although most dealers will not admit it, some fire departments and purchasing committees are known in the industry for being difficult to deal with. They’re unreasonable, they do not follow their own specifications, and they have a condescending “holier than thou” attit

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Posted: Apr 1, 2019

The Importance of Tire Pressure in Preventing Apparatus Rollovers

The Importance of Tire Pressure in Preventing Apparatus Rollovers


Today’s fire apparatus are built to the strictest safety standards of any industry, yet we still continue to experience major apparatus incidents.

We see them in our news feeds on nearly a daily basis. This serves as a constant reminder that our first task in any response is to arrive safely. Why does this continue to occur?

While there are many contributing factors, such as training, speed, and apparatus deficiencies, one simple factor is often taken for granted: tire pressure. National Fire Protection Association 1901, Standard for Automotive Fire Apparatus, general requirement 4.13.4 requires that each tire on the apparatus must be equipped with a visual indicator or monitoring system that indicates tire pressure. This makes it easier than ever to check air pressure, but are we correcting it?

My experience is that we are not, which is putting our firefighters and apparatus at a much greater risk of accidents. A tire depends on proper air pressure to give it a structurally sound shape. Improper tire pressure can increase braking distance, create less responsive steering, cause increased tire wear, and influence poor fuel economy. Underinflation also allows the sidewalls to excessively flex, which generates heat. High heat can cause tread separation and blowouts, often leading to apparatus rollovers. This problem is compounded on large apparatus like aerial devices and tankers (tenders). The tire’s air pressure is what determines the gross vehicle weight rating (GVWR) of an apparatus, not the axles. Tire manufacturers are required to brand the maximum weight-carrying capacity of a tire at its maximum safe air pressure into the sidewall of the tire. In addition to this, they often will publish load and inflation charts that will correlate the weight capacity of a tire as tire pressures decrease. Charts 1 and 2 are for an 11R22.5 tire, common to many apparatus, including a front-line engine on my department.

My department’s engine is a commercial chassis apparatus built by a major apparatus builder. It has a 12,500-pound front axle, with tires rated at 6,175 pounds at 105 pounds per square inch (psi) of maximum air pressure, meaning that both tires combined can carry 12,350 pounds. If you reference the inflation chart, a mere 5 psi of air pressure loss puts the apparatus below the GVWR of the front axle! We recently upgraded the front tires to 120-psi tires, which if you reference Chart 2, increased the front axle rating to 13,220 pounds at 120 psi, meaning that it is much more forgiving to a couple psi of pressure loss.

Tire Inflation Best Practices