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Sunday, September 4, 2005 Vol. II No. 18
Prepared by Bob Miller, ATP,
MCFI |
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Welcome to the
Over the Airwaves
aviation newsletter. This complimentary bi-weekly e-mailing is
being sent to pilots and aviation enthusiasts around the world.
Its aim
is to promote flight
safety, encourage students and new pilots, and to build enthusiasm
for aviation in general.
For a free subscription to
Over the Airwaves,
click
HERE.
Dear Pilots and Aviation Enthusiasts:
Of all the many factors that contribute to safe flight, there is one that rises above all others in terms of effectiveness. This number one factor is - FLY OFTEN! Pilots who fly often maintain their proficiency far better than those who fly intermittently. The number two factor in flight safety is - - TRAIN OFTEN! This means aggressively moving up through the pilot ratings, from private, to instrument, to commercial, to multi, to ATP, and picking up additional pilot endorsements along the way . . . like tail wheel, complex, and high performance. It also means going up with an experienced flight instructor at least twice annually to remove the rough edges around your many flying skills. The number three factor is - EXPAND YOUR OPERATIONAL ENVELOPE! It is this operational envelop that sets your skill and comfort level in, say, gusty cross-wind landings, low ceilings and poor visibilities, mountain flying, over water operations, aerobatics, Class B operations, and turbulence. This means identifying the limits of your operational envelope, then engaging an experienced flight instructor and pushing out the sides of that envelope. Good News . . . Bad News The good news is, if you do these three things on a regular basis, your chances of living a long and satisfying life as a pilot will be greatly enhanced. The bad news? Just the opposite. Fly intermittently; don't train regularly; never expand your operational envelope . . . . chances are you will be come an aviation statistic. Remember, there are over 550 general aviation accidents each year serious enough to attract NTSB attention. AOPA's Air Safety Foundation reports that 75 percent of these accidents are attributable to pilot error. Simply stated, the pilot was less than proficient! Such a simple little formula . . . Imagine . . . all we have to do is fly often, train often, and expand our operational envelope. It really doesn't take much more than this to assure your safety. This is a very small price to pay. Even better, the entire process is fun . . . or should be!
The plan was for him to propose marriage to her in an airplane over Niagara Falls. After that, they were to fly home and join in celebration with family and friends. Anyway, that was the plan. What was supposed to be a happy event turned into instant tragedy this past weekend as the happy couple and their pilot completed the first part of their plan and headed back over Lake Erie to their waiting family backyard celebration. Too soon to draw conclusions . . .
Without witnesses or any significant ATC communications to review, it's impossible to determine what happened. But this tragic accident does remind us of a unique phenomenon that can occur when flying over large bodies of open water. That phenomenon is the sudden loss of a visible horizon. This occurs when the blue/gray color of the water suddenly blends in with the blue/gray color of the sky. If the water surface is glassy or smooth, it becomes difficult to tell up from down! The non-instrument proficient pilot becomes disoriented . . . and tragedy soon follows. Again, we have no way of knowing if this was a contributing factor in this fatal accident . . . but it is a plausible scenario. It was a factor in the JFK, Jr. crash several years ago!
The insidious nature of the sudden horizon loss over open water is another reason for all pilots, primary or advanced, to become skilled on the gauges . . . in actual instrument weather conditions! And if they are not instrument proficient, they should avoid flying over large bodies of open water under any weather conditions. Scenario based training with a qualified instrument instructor, rather than rote simulated instrument work, takes the student pilot out over a large open body of water and lets him see for himself just how insidious this conditions can become . . . often without warning!
We have hard landings, bounced landings, ballooned landings, porpoised landings, wheelbarrow landings, and numerous combinations of each. The data clearly shows that there are more accidents during the landing phase of flight than in any other. Fortunately, most pilots and passengers survive these metal bending events! In short . . . landings remain a problem for everybody from new flight students at the local aerodrome to weather-scared air warriors flying hundreds of paying passengers to big city airports. Bad landings occur far, far too often. And they occur for a reason! What is that reason? The reason for bad landings is simply . . . . an error in either (1) landing pitch attitude, (2) sink rate, or (3) airspeed. If any one or more of these parameters are off the mark, a bad landing will likely result.
If the landing pitch attitude is too low, the nose wheel will strike the runway first. Being the furthest point from the center of gravity (CG), the nose wheel will bounce likely a rubber ball, driving the airplane into a precarious nose high attitude on the edge of stall. If struck too hard, the nose wheel, particularly in a retract, can easily collapse. In short, landing on the nose is bad form! Landing with an excessive sink rate causes the airplane to plop down hard on the runway. It is typically caused by either flaring too high or too late. Flare too high and the airplane plops like a heavy shoe. Flare too late (or not at all), the airplane attempts to fly right down through the runway surface. Landing with excessive airspeed results in a vain attempt to land the airplane before it is finished flying. Airplanes will not land until they've finished flying! The secret to good landings . . . Yes, Virginia . . . there is a secret to good landings every time! That secret is found in the final approach segment of the landing sequence. If the final approach segment is stabilized with the proper power setting dialed in, airspeed nailed, desired pitch attitude set, and correct descent (sink) rate established, a smooth landing will result every time . . . even in a gusty cross-wind. Sound easy? It really is. Do you know EXACTLY what these landing parameters should be for your airplane?? Practice at altitude . . . on cross-country flights! Unlike most flight training programs, my first few lessons with a new primary student typically involves cross-country flights to some neat location (to demonstrate the value of learning to fly). Along the way, I have the student practice a simple little exercise designed to plant the seeds for proper landing technique. This seed planting exercise has the student use both power and pitch to descend and maintain an assigned altitude, plus or minus 20 feet. The little secret is . . . I don't tell them that we're learning how to land! Instead, they grow comfortable in simply managing the various aerodynamic forces to achieve and maintain an assigned altitude and airspeed. Once they develop this skill, transitioning to the airport and learning to land is a simple walk in the park for them. It all happens very naturally!
While
we do not have hard data, AOPA and other industry groups
estimate that only one out of every three primary flight
students complete their training and receive a pilots
We hear of flight school diploma mills who do everything wrong short of physically abusing students. We hear of CFIs who simply "endure" the teaching process in order to log hours for that airline job. We hear of flight instructors, with zero interpersonal skills, who teach by intimidation. There are other reasons, too, why flight students quit. Some of these reasons revolve around poor curriculum design that condemns the student to boring, repetitive exercises in the practice area. What began as a highly anticipated joyful experience quickly deteriorated to an agonizing struggle between man and machine overseen by a cantankerous instructor with an executioner complex! Then we have instructors who simply cannot teach! Fortunately . . . it's not ALL bad! Like every other professional endeavor, there are both good and bad in the certificated flight instructor ranks. Personally, I have known more good than bad CFIs. With few exceptions, my experience with colleague CFIs has been positive. These fine instructors are really flight educators. Then again, I have known instructors who should be doing something else.
Your flight training experiences are invited . . . Nobody knows better about the current state of flight instruction in their area than YOU. For this reason, I am asking you to share with me either your own personal flight training experiences or those of people you know. Please use first names or initials only. My aim is not to incriminate or to point fingers at specific problems or locations. Rather, I am looking for consensus regarding the major kinds of problems impacting the entire flight instruction process. You can send me your observations by clicking HERE and completing the brief comment form. Or you can email your comments to me at rjma@rjma.com. Please note that there has been no research on this subject that I can find. Your comments, anecdotal as they are, could be the first such informal, non-scientific survey attempted. Hopefully, the results will prove useful in helping to improve the overall quality of flight instruction. Again, I will strip any personally identifying information from your responses. Thanks.
"Today, student, we're going to learn about in-flight fires and engine failures."
This is such a sad commentary on the way most flight instruction is carried out. Why? Because such rote training bears little resemblance to the real world of flight hazards. Unfortunately, most flight training is conducted this way. Fires and failures are among the skill elements listed in the Private Pilot Practical Test Standards (PTS). And any cursory review of most published flight training curricula, Jeppessen and Gleim included, reveals that these curricula were patterned right from the PTS. Every FAA approved, Part 41 flight school is required to follow an FAA approved training curriculum. Similarly, most independent (Part 61) flight instructors follow similar curricula. The end result . . . rote instruction where no real learning occurs! The absence of human factors, not rote skill deficiencies, are what kills pilots!
As with most things in flight training, the airlines discovered and aggressively adopted human factors training with their flight crews. Certainly if human factors training works with seasoned pilots, it will work with primary flight students as well. Why limit it to those very few private pilots who make it to the ranks of airline pilots? So what's the solution? The solution for private pilot training is to get out of the practice area and into the system on cross-country flights from day one of training! In fact, we could begin by shutting down the practice area altogether! Human factors say, that among other things, learning to fly must be kept entertaining to the student. Learning steep turns is boring . . . unless you learn them at 3,000' AGL over Niagara Falls or some similar attractive site while enroute to a place like Toronto's Class B airspace. By the way, over Niagara Falls is a great place to suddenly experience either an engine failure or fire! This training scenario sort of changes the rules a bit. How about that second dual cross-country flight where we hone those radio navigation skills? I always save that training for a good IMC day. Shortly after take-off, I give the student a revised altitude to fly . . . that takes him right into the clouds (with a pre-secured instrument clearance, of course). Shortly after that, I cover the attitude and heading indicators. Yes, Virginia, right in the clouds, partial panel, with a primary student! Scenario-based training is less costly! The second cross-country dual training mission described above accomplishes several training tasks simultaneously. They include: (1) cross-country flight; (2) radio navigation; (3) instrument flight; (4) partial-panel instrument work, (5) aeronautical decision making; (6) risk management assessment; and (7) emergency procedures. Again, these are all accomplished in a single (real world) flight rather than in multiple practice area flights in simulated conditions. Sure it's a lot, but it is both challenging and fun. Training costs are not only reduced at the primary level. Students trained this way will breeze right through their instrument rating!
How sad it is to continue reading about fatal stall/spin accidents, especially when, with proper training, they are ABSOLUTELY preventable! Case in point . . . a pilot and two passengers in a Mooney M20J (like the one pictured left) were making a "normal" landing to Olney Municipal Airport in Olney, Texas. For some reason, the 2,700 hour, commercially rated pilot elected to make a 360 degree turn while on the final approach leg. As he realigned himself on the runway heading, witnesses said that the airplane, ". . . rolled inverted, the nose dropped, and the airplane descended vertically until it impacted the ground." The aircraft impacted the ground 0.2 miles short of the runway leaving a creator only 2 feet by 3 feet wide. The pilot and his two passengers were killed upon impact. The NTSB probable cause finding was, "the pilot's failure to maintain airspeed sufficient for flight resulting in the inadvertent stall/spin. A contributing factor was the prevailing tailwind." Spin training is a MUST for all pilots! One of the raging debates in aviation continues on the subject of spin training. Opponents, of which there are many, say that the best way to prevent a spin is to teach students to avoid a stall. Then, rather than actually demonstrating a full stall, these same opponents bring their students to the very earliest stages of an incipient stall, then recover at the first chirp of the stall warning horn. The student never actually experiences a fully developed stall . . . much less anything remotely akin to a spin. "See that," asks the cautious instructor? "See what," replies the student. "That was a stall!" "Huh," replies the student. "I felt the wings buffet a little. Was that really a stall?" Why spin training is necessary . . . The above illustration of incomplete stall/spin training is simply not convincing. The student comes away from this exercise with a "oh - hum" attitude regarding the insidious nature of the stall/spin scenario. Lacking an awareness of just how fast a stalled wing can fall out beneath him, he treats the whole matter rather casually. Before long, he forgets all about it. My first real training experience with stalls and spins came in an Extra 300, a first-class aerobatic aircraft. The instructor pilot asked me to gently pull the airplane up into a power-off stall. I did so, casually, expecting the airplane to go through the same buffeting I had experienced numerous times before in Piper Warriors, Archers, and Cessnas. What I experienced took my breath way! When the Extra 300 wing reached its critical angle of attack, my seat (with me in it) seem to fall right out the bottom of the airplane! There was no warning buffets, no stick shaking, no warning. Bam . . . right out the bottom I fell! Taken by surprise, I allowed the Extra 300 to yaw slightly to the left as I attempted to recover. Instantly, the left wing fell out below me, leaving the airplane inverted in a nose down attitude. I struggled to regain control but my head was spinning as fast as the airplane! The ground below was coming up fast and revolving so quickly that I couldn't regain my senses . . . nor control of the airplane. Fortunately, I had a qualified instructor pilot in the back seat to take over the controls. After two more such experiences, I finally learned how to both prevent and instantly recover from spins in the Extra 300! This experience carved a memory in my brain that I will NEVER forget! I saw first hand just how quickly a spin can result out of an uncoordinated stall. You do not need training in an Extra 300 to learn spin recovery . . . You can acquire the same spin recovery skills in your Warrior, Archer, or Cessna. A qualified flight instructor can duplicate the same stall/spin scenario I experienced in the Extra 300. The airplane is pitched to a full stall. The rudder is simultaneously kicked in the direction of the desired spin. Performed properly, the inboard wing will suddenly drop off. It is then recovered before completion of the first full turn of the spin. [Caution: consult your airplane's POH before attempting any unusual maneuvers and try this first with an experienced instructor on board.] It is as simple as that. And with this experience, the student learns just how quickly a spin can occur . . . and how easily the application of the proper control inputs can instantly recover from the spin. How will spin training help to recover a spin occurring down low in the traffic pattern? Answer: It can't! Spins occurring down low in the traffic pattern are essentially non-recoverable. There simply is not enough altitude remaining to recover. The real question should be, "Will a spin proficient pilot permit an airplane to even approach a stall/spin attitude at traffic pattern altitude? Answer: NO! Anybody who has had actual experience with spins and their recovery will NOT permit his or her airplane to even come close to the flight parameters (pitch/yaw) at pattern altitude that will produce a spin. Such was clearly not the case in the stall/spin accident described above. c Note regarding flight instructors: Many flight instructors are NOT proficient in spin recovery! All CFIs undergo mandatory spin training to become a flight instructor. For many, this training is sorely deficient, often given by another CFI who is also nonproficient in spins. This "blind leading the blind" process is one very good reason why there are so many opponents to mandatory spin training for private pilots. There are simply too few CFIs out there who are qualified to give this kind of training!
Short field take-off technique should be the norm, not the exception! Contrary to commonly observed practice, particularly around big city airports with wide and long runways, short field take-off technique should be the preferred technique EVERY TIME, on EVERY runway, for EVERY pilot! When you do, your margin of safety will be dramatically improved. Why are short field take-offs safer? First and perhaps most obvious, a properly executed short field take-off technique will carry you higher sooner, thereby putting the most possible altitude between you and obstacles along your departure course. Less obvious but perhaps more significant from a safety perspective, achieving a higher altitude sooner provides you with more emergency landing options should you encounter an engine failure on take-off. Third, I like short take-offs because they help to instill a better understanding of the relationship between parasitic and induce drag and Vx and Vy speeds. When performed properly, the short field take-off technique achieves maximum advantage of these four aerodynamic factors. In so doing, we achieve the maximum operational performance from our airplane.
Let's look at each of these four factors . . .
In summary . . . The short field take-off technique enables us to ignore the effects of parasitic drag while at the same time minimizing or removing the adverse effects of induced drag until reaching rotation speed. The requires holding the nose on the ground (or low in a tailwheel aircraft) until reaching Vx speed. Upon reaching Vx, we pull sharply on the yoke or stick and pitch immediately to maintain Vx speed until crossing any obstacles along the departure course. Upon clearing the obstacles (or 50'AGL - which ever is higher), we pitch the nose slightly downward to achieve and maintain Vy speed until reaching our cruise altitude. All in all, the short field take-off technique secures for us the airplane's greatest performance capability all for the purpose of maximizing our margin of safety throughout the take off roll, climb above obstacles, and our climb to cruise altitude.
Instrument student Ravi Bansal and I will be heading out to Bend, Oregon next week to pick up and fly his recently ordered Columbia 400 back to Buffalo, NY. Before returning, however, both Ravi and I will be receiving four days of factory flight training in this, the fastest production single engine piston airplane on the market today! Watch the next issue of "Over the Airwaves" for a recounting of our experience in completing this mission.
Few aviation topics over the past decade have generated more debate among high performance airplane owners than the issue of running their big bore Continentals and Lycomings on the lean side of peak EGT (exhaust gas temperature). Certainly nothing I write here is likely to resolve this debate. I will, however, offer observations based upon my own seven (7) years and two engines worth of experience operating Continental TSIO520-R engines on my Turbo 210. Like so many aviation practices, much of how we operate our engines is based more upon legends and traditions than upon actual science. An often heard statement in many hangar flying discussions goes something like . . . "This is the way I was taught, so this is the way I will do it." Unfortunately, many such "Old Wives Tales" get elevated to "best practice" status. Science gets trumped by tradition, half-truths, and ill-conceived notions of what's right and proper. It's all about mixture control . . . and where to set it. For those not involved in the lean of peak (or LOP, as it often referred to), this entire discussion revolves around the big red knob immediately to left or right of the throttle control, and where to set it. In other words, just how lean should I set the mixture? First some half-truths . . . Those generally opposed to LOP operations are quick to point out that excessive leaning causes the engine temperature to rise to a dangerous level. FACT: Excessive leaning causes the engine to quit. After all, that's how we typically stop our engines - by pulling the mixture control to full lean or idle cut-off. The engine temperature, measured by EGT (exhaust gas temperature) and CHT (cylinder head temperature) . . . as well as TIT (turbine inlet temperature) in turbo-charged engines, does increase as we lean the mixture - but only to a point. If we continue leaning beyond this point, EGTs and CHTs will begin to cool. To be accurate, excessive temperatures are caused by leaning to peak EGT and not beyond. Another half-truth is the belief that engines cannot run smoothly when leaned beyond peak EGT. This is certainly true in most carbureted and stock fuel injected engines. It wasn't until GAMijectors came along in the early 1990s. GAMijectors solved the problem of unbalanced fuel/air mixtures going into each cylinder. FACT: Engines equipped with GAMijectors CAN operate smoothly throughout the entire leaning cycle until they are, in fact, leaned to the point of stopping. Here's the problem with running lean of peak with stock fuel injectors . . . A careful study of the chart below reveals how each of six cylinders reach peak EGT at different fuel flows. This is due to quirks in the factory induction system resulting in different fuel/air mixtures going into each cylinder. Cylinder #1, for example, peaks at 14.6 gallons per hour. Cylinder #6 peaks at 13.4 gallons per hour. The net difference is 1.2 gallons per hour. The problem comes when attempting to lean an engine with these stock injectors. By the time cylinder #6 is leaned to lean of peak EGT, cylinder #1 is so far beyond LOP that it quits firing. When this happens, the engine begins to run rough.
Here's the fix . . . George Braly, an aeronautical engineer and founder of of General Aviation Modifications, Inc. headquartered in Ada, Oklahoma, discovered that the fuel/air mixtures going into each cylinder could be precisely matched by tweaking the size of the individual fuel injectors. Rather than "one size fits all" injector, George found an easy way to tailor the openings in each fuel injector to deliver exactly the right amount of fuel. These tailored injectors are called GAMijectors. Voila' The fuel/air mixture going into each cylinder is the same. The power developed by each cylinder is now the same. The engine runs smoother. It also runs smoothly at 100 degrees F or more lean of peak. And it saves between 3 and 4 gallons of fuel per hour. Most importantly, cylinder head pressures are dramatically lower. The engine runs cooler. And with lower pressures, temperatures, and less lead accumulation on the valve guides, the engine lasts longer. So if there was a "win-win" scenario in engine management, it has been made possible by GAMIjectors.
While sitting at your
desk, lift your right foot off the floor and make clockwise
circles with it. Bet you can't do it! [Thanks to AVSIG member John Hartmann for sharing this. Lots of fun aviation things are found by clicking HERE.
No airline reservations to make. Do your pre-flight planning, gas up the bird, and go! Point: Owning an airplane is within reach of nearly every pilot. A little careful budgeting and you could be on your way to exciting locations every week! Click HERE to view the photos of this fast, fun trip!
It was a cool afternoon last year near Traphill, NC. The outside temperature was 46 degrees F. A 750 hour pilot with three passengers took off in good VFR conditions for a pleasure flight in a Cessna 182. Shortly after take-off, one of the passengers recalled that the engine sounded, "Like a choke was pulled on the engine, as if you were restricting air". He said that the pilot then pulled the carburetor heat and tried to lean the fuel mixture. The engine did not regain full power, and the pilot made a forced landing in a rough and uneven field. The airplane cart wheeled before coming to rest. The pilot was killed and his three passengers were seriously injured. The NTSB listed the probable cause of this fatal accident as:
A preventable accumulation of ice in the carburetor spelled disaster for this pilot. What is carburetor ice and how does it occur? The first diagram below illustrates the typical carburetor. Outside air is drawn up through the bottom of the carburetor. It is compressed slightly as it passes through the venturi where it is mixed with fuel. The temperature of this fuel air mixture drops quickly due this compression and subsequent expansion.
This dramatic cooling at high power settings presents no operational problems. However, at low power settings (generally less than 2,000 RPM) and in the presence of high humidity air ice can form inside the carburetor. As it does, the air flow through the carburetor becomes increasingly constricted. This constriction of air flow produces the same effect on the engine as retarding the throttle.
Carburetor ice can occur at outside temperatures up to 100 degrees F.
What is the first sign of carburetor ice? The first sign of carburetor ice is typically a reduction in RPM. This results from a constriction of the air flow through the carburetor as mentioned above. The pilot's first response should always be to apply carburetor heat. This will direct heated induction air from around the exhaust shroud into the carburetor. If the pilot waits too long before applying carburetor heat, there may not be time to clear the ice before the engine quits (as likely happened in the accident scenario above).
Affectionately speaking, old Richard has a way of saying it like it is. If you learn to fly in simulated instrument conditions, then that's the conditions you're qualified to fly in. If you take these same simulated skills into real instrument conditions, you'll likely not come out alive. That is a very true and accurate statement! Somewhere in the annals of FAA historic wisdom, we've come to accept the view limiting device (hood, foggles, stationary simulator) as being suitable substitutes for actual instrument conditions. Perhaps the FAA thought this was the lesser of two evils for those clear sky training grounds found in Florida and Arizona. After all, finding low stratus clouds and ground hugging scud is far more difficult to find in the south than they are in the north around the Great Lakes, in the east along the Atlantic shore, and in smog prone areas of the Pacific coast.
Let's get real . . . If you live and fly predominantly in the sun-soaked south, your likelihood of getting disoriented in a cloud is far less than those of us who live and operate in the land of four seasons. For us, we bob and dodge with IMC conditions nearly every day. We are the ones who must throw away the view limiting devices and, instead, become comfortable with the real world of IMC flight. Those who don't will likely be the future data points in the pie chart (left). Okay, simulated conditions have a place, BUT . . . If you take the entire instrument curriculum and divide it into its two most basic components, they would be: (1) aircraft control solely by reference to the instruments, and (2) instrument procedures. The ONLY way to satisfactorily learn the first component is while buried in actual instrument conditions with all of its associated "strangeness," noise, and absence of an immediate escape route. These are the very conditions that can cause improperly trained pilots to die in the clouds. These conditions cannot be simulated by hood, foggles, or stationary simulator. To attempt to impart aircraft control skills under simulated instrument conditions could be seen as is a cheap deception played on well-intended instrument students! Yes . . . a hood, foggles, or stationary simulator can play a role in instrument training. That role falls under component #2 - instrument procedures. Once the student has mastered aircraft control in actual instrument conditions, some basic instrument procedures can be taught under simulated conditions. Keep in mind that instrument procedures, too, should be taught in actual instrument conditions whenever possible. Okay, you can't always find instrument conditions when you want to train. . . No argument here. If you can't find IMC to work in, then yes . . . do your best to simulate real world conditions. But don't ever allow a good IFR day to come and go without scheduling a "for real" training session! And don't even think about going into the clouds on your own unless you've had many dual hours in the actual stuff. A word about minimum instrument conditions . . . Regrettably, we could be experiencing a "cycle of incomplete instrument instruction" where flight schools cancel flight instruction when weather approaches minimum visibility and ceiling conditions. They set higher training minimums at, say, 600'AGL and/or 2 miles visibility. To them, this makes sense from a safety perspective. The problem is, many of their instrument students who, themselves, go on to become instrument flight instructors have never flown an instrument approach to published minimums. So they, in turn, set artificially high weather minimums for their own instructional services. Thus, the "cycle of incomplete instrument instruction" perpetuates itself. Eventually, many of those instrument landings that are, in fact, made to published minimums are flown by somebody who has never done one before. And we wonder why they die!!!
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For Sale:
Bob Miller,
ATP, MCFI
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