Sunday,
February 25, 2007 Vol. IV No.
4 |
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Welcome
to the
Over the
Airwaves
aviation journal. This complimentary bi-weekly e-mailing
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Dear Pilots and Aviation Enthusiasts:
Spring
is Just Around Depending where we are on the globe, spring could be just around the corner. With this change of seasons comes new and differing weather patterns. Some of these changing patterns could have profound effect on our upcoming flights. For those of us residing in the northern hemisphere, spring brings increasing risk of airframe icing. Yep, this apparent paradox is a result of warming but still sub-freezing temperatures aloft. Temperatures that were once too cold to produce super-cool large droplets (SLDs) at the higher altitudes, now serve as giant ice-machines in the sky. Freezing rain is another factor associated with the transition from winter to spring. Lingering cold fronts sliding southward from the polar regions meet and dip under moisture-rich coastal warm fronts. This produces rain above the freezing air below. Aircraft operating through this vertical interface could be facing nasty freezing rain.
Watch for those lows! A careful study of surface analysis charts should be part of every pilot's pre-flight briefing. This valuable weather product shows the position of highs, lows, frontal movements, and pressure gradients. Each of these weather factors carries stern warning message to pilots.
If our planned route of flight takes us through the northern portions of a low, watch out. Super-cooled water droplets could be waiting in hiding! Remain clear of frontal activity! Our next concern is frontal positions. Typical winter stratus clouds top out at between 6,000' and 12,000' MSL. Most light GA aircraft can climb above these sub-freezing clouds and into clear air above with relative ease. Fronts can change this cloud condition dramatically! Unstable air associated with both warm and cold fronts can push cloud tops high into the flight levels, thus making them unreachable by even turbocharged airplanes. This, of course, complicates our ice escape strategies. Keep an eye on those pressure gradients!
Regrettably, far too many of us take a walk out on the ramp, look up, then scan the skies for go/no go information. We base our launching decision on how things look over and around the airport. Once aloft, however, things suddenly appear to change. It is the "change" part that often ends in tragedy. Become a weather savvy pilot! Gone are the days of those black and white weather depiction charts with impossible to read squiggly lines that confound the efforts of student pilots trying to score well on FAA knowledge tests. These have been replaced with far more readable, looping color weather graphics available on every web accessible personal computer - and even on handheld Blackberries (I never leave home without mine).
Imagine, if we could reduce weather related fatal accidents by 50% or more, our world of general aviation would be dramatically improved . . . and our insurance rates would begin to tumble! Curiously, our moms and spouses would be greatly relieved as well! Fly safe,
Bob Miller, ATP, CFII Four Macho Guys in an Airplane - Could be a formula for disaster!
The weather at their departure airport was marginal VFR at best. Surrounding airports were reporting clouds at 700' and 1,000' with a visibility of 3 miles or less. Not to worry! Most VFR-only pilots departing in marginal VFR conditions might consider having a pre-flight chat with a FSS specialist. This guy departed from a valley airport surrounded by peaks rising 1,000' to 3,000' above the airport. His planned route of flight took him into mountainous terrain to a destination surrounded by very high peaks. Curiously, this intrepid pilot did not have such a briefing nor did he contact DUATS. Could it be that he feared hearing the words, "VFR flight not recommended?" Then again, perhaps this was not your typical pilot. The fact that he departed 241 pounds over maximum allowable gross weight with a CG location 2.57 inches aft of the rear limit might shed some light on his temperament. Pressure to go . . .
Next, we have a plane load of professional risk-takers. The testosterone was likely dripping out the tailpipe as this overloaded Bonanza taxied to the runway. Even if the pilot exercised good judgment and suggested they wait a few hours for the weather to improve, his passengers possibly over-ruled him. Hey, what's a guy supposed to do? Of course, this is pure speculation, but the circumstances strongly suggest that this pilot was under a great deal of pressure to launch. So what happened? According to the radar track, the airplane took off and made a circling climb over the airport to 2,500' MSL. Its turn tightened along with a loss of 500 feet of altitude. It made one more descending 360 degree turn before impacting terrain about 3 miles west of the airport.
All four persons died in the crash. It is easy for us to "Monday morning quarterback" this accident. We can quickly conclude why this tragic accident occurred, but what we cannot observe is the conversation that took place among these four victims as they climbed into the airplane. Perhaps the pilot caught a glimpse of the moon or rising sun through a break in the clouds. Maybe he could see the tops of the surrounding ridges through the haze. Tragically, whatever visibility he had as he rolled down the runway was lost shortly after takeoff. Did he have a back door? There are precious few circumstances where airplanes operate in conditions without a backdoor to escape through should something go wrong. What was this guy's backdoor? The airport was surrounded by terrain rising upwards to 3,000' above the airport. It was dark, with low ceilings and poor visibility. He had no instrument rating. His airplane was being operated over-gross and outside its CG limits. All things considered, this pilot did what every professional firefighter is trained to avoid . . . he went into a risky place with no way out! Mastering those Pesky Holding Patterns Cinch up your seatbelts . . . you are about to hear something shocking! Nobody in the real world cares how you enter an assigned holding pattern! Sure, we all learned about parallel, direct, and teardrop entries, but from a practical perspective, ATC is happy if we manage to find the holding fix at the assigned altitude.
ATC does care that we fly them correctly Let's say that ATC instructs us to hold east on the 20 DME fix of the 265 degree radial. We comply by joining the 265 degree radial, then flying either east or west to the 20 DME fix. Once there, we maneuver onto the racetrack anyway we can! The important thing is that the airspace we circle in is the same airspace ATC expects us to be circling in. Note the holding diagram above. The holding pattern is on the east side of the 20 DME fix, with standard right hand turns. This places the track on the north side of the 265 degree radial. That is where we should be circling. How we got into the hold is not important!
Look at another example ATC instructs us to hold northeast on the 030 degree radial, 16 DME fix. Referencing the chart to the right, we see precisely where ATC wants us to hold. Again, how we get into the pattern is of little consequence to anybody (other than your CFII or the DPE sitting next to us). The important thing is that we hold on the proper side of the radial and the on the proper side of the holding fix. Try drawing the holding pattern before attempting to fly it. ATC always gives us time to copy holding instructions. We should use this time to not only copy these holding instructions, but to actually sketch the holding pattern on a piece of paper. Be sure to get the pattern drawn correctly before attempting to fly it. Two additional considerations While how we get into the holding pattern is not important, what is important is that we hold precisely where instructed. We do this for two reasons.
Holding patterns are not nearly as complicated as we might believe. We simply need to get in them, fly in the proper direction, then relax! Real Live Emergencies - Pilot/ATC Communications Recordings
Imagine commanding an airliner with 178 people aboard when a fire in the lav is reported to you. Ever imagine B-747 with genuine low fuel emergencies? This stuff happens.
CNY Aviation.com assembled
several dramatic recordings of actual pilot/ATC
communications of the above REAL in-flight emergencies.
Click HERE to listen. Pay close attention to how each of the pilots and controllers deal with the situation. As you will hear, each reacted differently! Thanks to Keith Harlock of Buffalo, NY for pointing us to this dramatic website. 1/16 of an Inch of Frost . . . !
Such was the case when this 1,800 hour, commercially rated Cessna 172 pilot taxied from his outdoor tie-down space at the Minute Man Airport (6B6), Stow, Massachusetts. Everything sounded normal, said witnesses. The engine was running fine as the airplane raced down the runway. Then something went terribly wrong! Another witness working near the runway said that the nose was "bobbing up and down." She said that the airplane started to make a left turn. She heard a power reduction, and watched the nose of the airplane drop as it disappeared into the trees. She then saw smoke where the airplane had disappeared into the trees. NTSB Probable Cause Findings
Try putting yourself in the pilot's seat during this ill-fated flight. It is unbearably cold outside. You are in a hurry to get underway. A quick pre-flight, then you climb into the cockpit, strap yourself in, and you begin a quick taxi to the departure runway.
Trees are looming ahead. You press harder on the throttle. You pull harder on the yoke. The airplane begins a familiar pre-stall buffet. It refuses to climb. You are still below tree-top level as you give one last mighty tug on the yoke.
The left wing and nose suddenly drops. Your windscreen is filled with the images of green trees and brown ground. You have about nine seconds to live! Frost on the wings no thicker than medium-coarse sandpaper! Another pilot at the Minute Man Airport reported he had frost on the top surface of both wings of his airplane at the same date and time as when the C-172 pilot took off. He estimated the depth of the frost at 1/16 inch.
Instead of following the curved upper surface of the wing, the frost produces a prematurely early separation of the air flow above the wing. This early air separation is precisely what takes place during a stall.
Why Aircraft Mishaps Occur! The flow chart below provides a compelling illustration of why aircraft mishaps typically occur. A normal situation, involving the pilot, the aircraft, the environment, and a particular phase of flight, suddenly changes. This change captures the pilot's attention. He or she selects an appropriate response. He calls upon his mental prowess to assess the situation, then he relies upon his aeronautical skills to execute the proper procedures.
Suddenly, however, things do not compute. The pilot becomes momentarily disoriented, confused, or in doubt as to what to do. Proper procedures, taught to him months or even years earlier, suddenly become mental mush. Distracted by what should be a simple problem, the pilot stops flying the airplane and, instead, focuses his attention on resolving the problem. Within minutes (sometimes seconds), the fatal mishap occurs. Now meet the proficient pilot . . . Let's run the same scenario again. This time the pilot is on top of his/her game. An unexpected change in the flight status occurs. The pilot selects the appropriate response. Both the head work and the required skills are firmly in place. His stress is under control. He considers the relative risks of each possible action.
A quick reference to the above flow chart illustrates two required actions: (1) skills and procedures and (2) headwork. Following the arrows suggests that this pilot is unlikely to make a mistake. He is in command of the situation. Brain lapses!
Worse, how many times has an acquaintance walked up to you, and you drew a blank on his or her name? Believe me, this problem worsens with age! Our brain is a miraculously created organ, yet it requires continuous reinforcement to retain certain pieces of information. Peoples' names and proper emergency responses in airplanes typically fade with disuse. Proper responses to unexpected in-flight events, like names and faces, fade with time. For VFR pilots, this cognitive fading can be measured in months. For IFR pilots, this fading is measured in days and weeks. The ONLY remedy is to reinforce our aeronautical knowledge and skills on a regularly scheduled basis. Scroll back up this article and compare the two flow charts. Observe the key differences between the two. Then ask a very private question: Which flow chart represents me??? The Classic Class E "Bust"
What he doesn't recall, however, is that controlled airspace lies somewhere just above his airport. He climbs blissfully to 1,500' AGL and skims just below an overcast layer. His life is about to change!
Fortunately, he recovers to fly another day, but this operational error (loss of required separation) triggers a certified letter from the FAA. What did he do wrong? Classic Class E "Bust" Depending upon where our non-towered airport is located, Class E airspace begins at either 700' AGL, 1,200' AGL, or 14,500' MSL. Those faded magenta and faded blue lines on the sectional chart holds the key to determining which altitudes apply.
In the scenario above, our hapless pilot climbed right up through the top of the 700' AGL Class G ceiling and into Class E airspace. Failing to recognize this error, he violated the increased cloud clearance and visibility requirements of Class E airspace.
Class E airspace requires three miles of visibility and we must remain 500' below, 2,000' abeam, and 1,000' above the clouds. Failing to remain 500' below the clouds, there was insufficient time to avoid the near miss with the Airbus as it descended through the clouds. Sure . . . in most cases, a sharp controller would have observed these conflicting targets in sufficient time to alert the Airbus crew . . . but not always! Had the Piper pilot not had his transponder on (or squawking altitude), neither the controller nor the TCAS (traffic collision alerting system) on the Airbus would have recognized the threat. Know your airspace! Sure, the national airspace system is a complicated affair of rules and exceptions. Nonetheless, both VFR and IFR pilots must know and recognize their nuances. If we are unsure of the airspace rules, find a qualified CFI or other knowledgeable pilot, and learn them . . . BEFORE we fly again! AOPA's Air Safety Foundation Releases Accident Data The 2006 Nall Report is out and the results are not surprising to regular OTA readers. The 2005 GA fatal accident rate increased by 10.3 percent over 2004 . This continues the steadily worsening fatal accident rate trend that began in 1999 (source).Air Safety Foundation chief, Bruce Landsberg, is quoted in this report by saying, "While the sky certainly isn’t falling, the record could stand some improvement." In reality, this jump in the fatal accident rate is far more than a "minor detour," as the 2006 Nall Report suggests. Instead, it is a major turn in the highway. The Air Safety Foundation is apparently not alarmed by this worsening six-year fatal accident trend. Should we pilots in the field be alarmed? The big question is, of course, why is this six-year fatal accident rate increasing? Looking back to 1999, where we observed the beginning of this worsening fatal accident rate, we also observed the emergence of new generations of technology, from glass panel cockpits, to ballistic recovery chutes, to sleek, glass composite aircraft. Perhaps too much of this technology is being acquired by pilots with more money than aeronautical ability. During this period, we also observed the effects of a reduction in pilot currency requirements. FAR 61.57, for example, no longer requires six hours of actual or simulated instrument flight to maintain one's IFR currency. We pilots also continue to be encouraged by falsely positive messages from our big membership organizations that we pilots are "good and getting better." Yes, our raw number of fatal wrecks is down, but so are our total flying hours. The numbers are down, but our RATES are up! Much of this, of course, has been covered in earlier OTA issues. The point is, we are not good and getting better. As our accident rate continues to climb, our insurance rates quickly approach unaffordable levels. Some owners of Columbia 400s and Cirrus SR22s are now paying in excess of $12,000 in annual insurance premiums, and this number is expected to jump to $40,000 for the privilege of owning a VLJ (very light jet). In summary, our fatal accident rate has climbed steadily since 1999. The sooner we recognize this sad fact, the sooner we can begin doing something about it. Know Your Instrument Systems ! !
After you complete this exercise, explain to yourself (or anybody who will listen) what happens when various elements of these systems fail!
And for those Glass Cockpit folks . . . For those fortunate pilots who have risen above the "steam gauge" generation of aviation, can you explain the inner functioning of your glass panels?
In a world where technology rules, we pilots can find ourselves dangerously unprepared when this technology fails us . . . particularly when this happens at a critical stage of flight. For example, what impact will a failed alternator have on our panels? Do we need to begin unloading the electrical demand or will cross-tie switches and a backup alternator save the day? What will happen if we lose our primary static source? Will both our glass panel and emergency backup instruments be affected? If so, how? Insurance Gotchas!
Most of us who own airplanes are familiar with purchasing aviation insurance. Like everything else we do, shopping for the lowest premium price can make a big difference in our total flying budget. Shopping for insurance . . . go first to the exclusions section of the policy! On occasion, we may take off a couple pounds over gross. Let's say that our slightly over gross airplane runs off of the runway resulting in serious damage. An investigation results in a careless and reckless charge (FAR 91.13) and a 60 day suspension of the pilot's airman's certificate. Will the insurance company pay on the claim? Will the insurance company pay on this claim? Maybe yes, maybe no, depending upon what exclusions are written into your policy. Another example. Let's say you decided to try the latest diet pill. Yep, tragedy strikes and you died in the accident. The toxicology revealed the presence of this drug in your tissues. Turns out that this drug was on the FAA's list of required reportable drugs. Since your medical was not due for another six months, you didn't report it. Result: Your medical certificate is deemed void.
Want more? Let's suppose there was a recurring airworthiness directive (AD) that you neglected. An accident results. Will your insurance company pay? There are dozens of possible gotchas in our aircraft insurance policies. Did we forget about that BFR? Are we still legal to file an instrument flight plan? No, Virginia . . . purchasing the least expensive insurance is not always the best way to go! Not being an insurance expert myself, I purchase my aviation insurance through a trusted and knowledgeable aviation insurance broker. His job is to be certain I understand the exclusions. Similarly, I'm willing to pay a few dollars more to minimize the possibility of being denied a claim for inadvertent actions on my part! If we naively believe that insurance companies have our best interests at heart, talk with some property owners in and around New Orleans who suffered extensive damage from Hurricane Katrina! Remember, it's the fine print in the exclusions section of the policy that get us! Managing Stress in the Cockpit Stress is a curious phenomenon. During levels of low to moderate stage, we tend to perform better. Beyond that, however, we can quickly turn into blobs of protoplasm, unable to tie our shoes! The ill effects of stress when they occur on the ground are bad enough. When these ill effects occur while we are at the controls of an airplane, stress can kill us. Stress, in fact, is one major causal factor in the 4 out out every 5 fatal accidents that are officially attributable to pilot error. A quick reference to the chart below reveals that our performance actually improves while experiencing increasing levels of stress, but up to a point. Beyond that point, our performance drops precipitously.
Imagine an instrument approach to minimums or a VFR landing in 32 knot gusty crosswinds. Feelings of anxiety or stress can be a good thing. We rise to the challenge. Our concentration is focused on flying the airplane. We sense every movement, every heading and altitude change. We become masters of our airplane while beads of perspiration gently roll down our foreheads. All is NOT good, however! Not experiencing stress in the above example can be a bad thing, because it can lead to complacency. I recall flying a localizer to minimums one nasty wintry evening to the Olean, NY Airport. This had been one of many instrument landings to minimums I had made earlier that week. Rolling out on the runway, I noticed that my hands were dry. Normally I, like most instrument pilots, experience stress-induced clammy hands and fingers whenever going down to minimums, particularly on a non-precision approach. By this time in the week, I had grown too comfortable, too complacent. I lost my edge. I reported this experience to my pilot mentor, Louie Nalbone, a CFII/DPE who heads up Dunkirk Aviation Sales and Services, Inc. in Dunkirk, NY. "That's bad, Bob," he said. "You've got to experience enough stress in airplanes to keep you on your toes, particularly when on the gauges," he added. I never forgot Louie's wise words! But what is too much stress??
The problem of too much stress occurs when something unusual begins to happen. Let's say we are flying along at night in instrument conditions. Unexpected headwinds have put us into a low fuel situation. As we descend on the approach, a sudden encounter with unforecasted/unreported moderate to severe icing. The noise of frozen precipitation striking and sticking to our airframe and wings grabs our attention. Our heart rate increases. Our stomachs begin to feel queasy. We begin to sweat. Whoa . . . what's happening. RPM (or manifold pressure) suddenly drops. The engine begins "chugging." Our stress level zooms! Our brain is instantly frozen in time. We press the mike button and issue a frantic call.
What happened? What happened is simple. The increased stress we experienced as a result of a sudden encounter with icing conditions effectively blocked our proper response to the engine "chugging." Momentary induction icing started us down the road of mental inefficiency. Thus, the simple task of lowering the gear in preparation for landing was totally forgotten! The chart below illustrates how even modest levels of stress can influence our response to urgent situations like this.
So what's the solution? The solution to managing stress in the cockpit begins with proper instruction. Our flight instructor should be like a personal fitness coach working with us in the gym. He or she gently presses us into ever-increasing levels of stress-inducing exercises. Like the fitness coach, an effective CFI introduces real life, stress-inducing scenarios early and throughout the training process.
Ultimately the goal of every proficient pilot is to experience, in a simulated or controlled training environment, every possible emergency that could beset him or her aloft. Thus, when the real thing happens, he's prepared! It's in the checklist, stupid! The second thing we can do to mitigate the effects of stress is to develop checklist discipline. Learn to pull the checklist whenever unusual situations occur. Chances are, we will find something there that will assist us in resolving the problem. In summary, a little bit of stress is good. Excessive stress can be very bad. As pilots, we need to recognize when the subtle effects begin to take hold. We need to understand that the outward symptoms of stress may surface as overcompensation, denial, suspicion, paranoia, agitation, restlessness, defensiveness, excess sensitivity to criticism, argumentativeness, arrogance, and hostility. Stress can also manifest itself in feelings of depression, preoccupation, sadness, and withdrawal.
Frequent OTA readers know that I have little regard for the Practical Test Standards (PTS). Sure, as in all skilled endeavors, we require some objective basis from which to determine if a test-taker passes or fails a performance-based examination. From this perspective, the PTS works as intended. But aviation is far more than a skilled endeavor. Glass blowing, watch-making, and figure skating are skilled endeavors. Flying, on the other hand, involves a little bit of skill and a whole lot of judgment. It is the judgment part that the PTS falls far short of what it was really intended to do. This sad but true fact is affirmed in nearly every NTSB fatal accident report. But don't we need skills to fly safely?
With few exceptions, it is not the skill part that hurts us in airplanes. Instead, it is the decision we make regarding our fitness for a particular flight profile. Flight instructors, for example, make a fitness assessment regarding their students just before signing them off for solo flight.
Ultimately, the DPE makes a fitness assessment before granting the intrepid pilot a private pilot certificate or instrument ticket. So far, so good. Hopefully a series of correct and accurate fitness assessments led to the creation of a new pilot. It makes no difference what the rating or certificate level is. Private, instrument, commercial, multi-engine, CFI, CFI-I, or ATP. Each checkride is a fitness assessment made by somebody other than the candidate pilot. Who makes the fitness assessments AFTER the checkride?
Armed with a new pilot certificate or new rating in our pocket, we pilots are suddenly on our own to exercise our new privileges. What happens next? Free of the safety net provided by his or her instructor, the pilot must now rely on something with which he is not comfortable. He has to determine his own level of fitness to launch on a particular day. He's now all alone to determine if he can safely climb through a turbulent cloud layer. He wonders if he can safely take command of an airliner with 220 passengers in the back all wanting to be home for Christmas. Notice that skills have little to do with this self-assessment process. The certificate or type rating in his pocket affirms that he has the requisite skills. It is only his judgment that counts at this point! We acquired the skills but it is judgment that determines our level of proficiency! Unfortunately, we have no neat little measures of pilot judgment or proficiency. Instead, these attributes simply reveal themselves in our actions as we grow older as pilots. Some of us will stick our pilot certificate in our pockets and seldom use it ever again. Others will be content to make a couple of flights a year around the pattern. Many will purchase an airplane and take maximum advantage of the traveling wonders that await them. Others will earn a comfortable living as professional pilots.
Curiously, nobody but the pilot will know which category he or she belongs. There are no outward measures, no certificate endorsements, nor stripes on the sleeve to tell who is proficient or not. Only the pilot, himself, will know for sure! Don't believe this? Read the daily NTSB fatal accident reports!
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the Airwaves and to search for any past articles. Technical Assistance I would like to thank the following technical assistance contributors for their valuable help in producing OTA every two weeks: Barry McCollom, Kerrville, TX; Thom Riddle, Buffalo, NY; and Jay Rolls, Macon, GA.
©2001 Over the Airwaves, Buffalo, New York, USA. Any reproduction or duplication of Over the Airwaves, in whole or in part, without the express written permission is strictly prohibited. |