Sunday,
July 9, 2006
Vol. III No. 14 |
Welcome
to the
Over the
Airwaves
aviation journal. 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.
Dear Pilots and Aviation Enthusiasts:
Two words that speak danger to instrument students: sunshine and simulators! Each has the potential of robbing the instrument student of the opportunity to experience the challenging and often unexpected forces of nature. Unfortunately, we cannot do much about sunshine. It is always present unless, of course, it is obscured by clouds, fog, or the backside of the earth. In some parts of the world, sunshine is nearly always present during daylight hours. A view limiting device is the only means to pursue semi-meaningful instrument flying in sunny conditions. Flight simulators (the small stationary kind used by most flight schools), on the other hand, are purely discretionary items. They can be incorporated into the instrument flight training process at the will of the instructor.
Beyond that, stationary simulators are a poor substitute for getting out in the real weather and getting comfortable in a jostling cockpit with the machinegun-like pounding of rain beating against the windscreen and forward visibility down to one-half mile or less. Simulators are even a poor second to view limiting devices used in the real flying environment. What the real world has to offer! Nothing other than a multi-million dollar, full motion, airline-type simulator can prepare an instrument student for the vagaries of mother nature. Sure, a good sim operator can dial in wicked crosswinds, severe turbulence, and failed instruments. There is no question that a couple hours of stationary simulator training can work up a sweat. But that's just it . . . a sweat. Very little transferable learning takes place. Again, we're talking the stationary kind of simulator here.
Home for dinner? No problem in the simulator. You simply turn off the switch, climb into your car and you're home for dinner. Sure, one can argue that a simulator offers a better teaching environment than a noisy cockpit. You have to ask yourself, however, does the student learn better by listening to a chatty CFII or by facing the challenges straight-on and relying upon the CFII to help keep the airplane upright in the scud? Obviously you can set up scenarios in a stationary simulator that you would never attempt in an airplane, but not many. And those that you can simulate have questionable transferability to the real world. Finding real solutions to the chronic flight safety problem
We need to get ourselves into the national airspace system where clearances, vectors, re-routes, speed requirements, traffic avoidance, SIDs/STARs, departure procedures, holding, and thunderstorms, ice, snow, and and slippery runways actually occur. The airlines and the corporate world have been forced into simulators by the enormous operating costs of heavy jets, but this is not the case for a guy or girl learning how to fly a Piper Warrior. The differential cost between operating a four-seat airplane and a stationary simulator is far too small to justify robbing the student of real world in-flight experiences. Then again, teaching in stationary simulators represents a hefty profit center in some flight schools. Little wonder why we see so much teaching going on there! But I like to teach in sunshine and simulators! Sunshine and simulators make easy work for flight instructors. No risks there. Consummate safety is assured. It's hard to argue against that. Agreed, safety is our primary consideration, but risk management rather than risk avoidance is what we are after. Ask yourself this question . . . "If all we do is teach instruments in sunshine and in simulators, has the student really learned to manage the things that can hurt us in the real world?"
The procedures are familiar; voices are the same; runway layouts never change. Ah . . . . the sweet comforts of flight training. Then there is the real world! This is the "take no prisoners" attitudes displayed by professional air traffic controllers speaking at machine gun pace. These dedicated men and women create and orderly flow of international and domestic arrivals and departures into and out of the busiest airports in the world. They have no time for missed radio calls, inattention to instructions, or inability to respond quickly to rapidly changing ATC traffic movement strategies. The JFK - Newark - NYC Hudson River Corridor Flight Training Exercise
I took instrument student, Dennis Porebski, through this exercise a couple weeks ago. It proved to be a real "eye-opener" for him, so I decided to share the experience, including photos, with my OTA readers.
So here goes . . .
After a thorough pre-flight and a couple of quick button pushes on the Garmin 430 to load the plan, Dennis advanced the throttle, raised the gear, and the Piper Arrow climbed effortlessly through partly cloudy skies to our cruising altitude of 9,000' MSL. As depicted on the map (right), our route took us east toward Albany, then south via the Pawling Two STAR (Standard Terminal Arrival Route) to Bridgeport, CT, then southwest across Long Island Sound. The JFK ATIS advised that the Runway 31L ILS was out of service and to expect the ILS Runway 31R. Upon checking in with the NY TRACON, the controller told us to expect the visual for Runway 31L.
"Ah . . . it will take me a while to sequence you between heavy jet traffic for 31R," replied the busy controller. "That's okay, we'll wait," came our quick reply. And with that, we were given a series of delaying vectors for about 20 minutes. This gave us opportunity pay close attention to the fast speaking controller speaking with a thick New York City. Miss a call here and a pilot could wind up 100 miles out to sea!
Lunch at JFK, then on to the next phase of training. We downed a couple of sandwiches and cold water at JFK's only GA terminal, paid our $25 landing/parking fee, then returned to airplane for the most challenging phase of training. Dennis called JFK clearance delivery and requested a VFR departure to the west below 1,100' MSL, along with flight-following up the Hudson River. Our request was approved and we received taxi and takeoff clearance from Runway 13R.
After switching over to the NY departure controller, we were instructed to follow the Long Island shoreline by Coney Island direct to the Verazano Bridge that spans the NY City harbor. The view of the harbor as we passed barely 500' above the bridge was nothing short of spectacular. We passed directly over the Statute of Liberty and Ellis Island. Departure Control handed us off to LaGuardia Tower as we started up the Hudson River. I advised the tower of our intention to fly north along the river to the George Washington Bridge at the northern end of Manhattan Island, then back down the river to the Statue of Liberty, then over the Newark Airport for landing. The ride up and down the Hudson River and the view of the City from 1,100 to 1,500 AGL is indescribable. We were eye-to-eye with the building rooftops located less than 1/2 mile to either side of us! Over to Newark and the final phase of our training exercise.
Upon returning over the Statue of Liberty the second time, we
advised LaGuardia Tower of our intention to land at Newark.
They handed us back to NY Departure
Newark was handling simultaneous arrivals and departures on their parallel Runways 22L and 22R. The tower told of their intention to squeeze us in on intersecting Runway 29 between arrivals. The end result of this approach for me was a new appreciation for the word "squeeze." I do not believe that I have ever been closer to a converging aircraft in flight as we were with a UAL 777 on short final to Runway 22L as we were crossing the threshold to Runway 29! We landed, taxied over to Signature Flight Support, refueled, had a another cold drink, and relaxed for a few minutes before heading back to Buffalo. Unlike our quick departure from JFK, leaving EWR proved to be a bit more challenging. Clearance delivery gave us a full-route clearance to the west via the East Texas VOR (ETX). We plugged the numerous fixes into the GPS, then taxied to Runway 22R for takeoff. The tower put us in position, then quickly instructed us to return to the taxiway due to a last minute routing change. The tower gave us the new routing which was north via the Sparta VOR (SAX). We made the changes in the box and we were re-cleared for takeoff.
It was a great day of training. Dennis did more radio work and ATC coordination in one day than many GA pilots get in a full year. He performed masterfully. More importantly, Dennis gained the confidence to operate safely in the IFR environment in the busiest airspace in the world. Yes, he learned to swim in the deep end and he is a much better pilot for it. Now for the best part - PHOTOS! Please click HERE for a series of photos of this challenging training exercise!
The presence of such gouging makes it doubly important that all pilots click on http://www.airnav.com/fuel/local.html before commencing any cross-country flight. What you see could save you hundreds of dollars. For example, landing at Newark, NJ, just 10 miles south you will find Signature selling the same 100LL for $4.80/gallon. You can get to the AIRNAV page and other useful flight planning information including every published approach procedure in the the U.S. by clicking on the preflight planning link located in the top banner section of each issue of Over the Airwaves.
Have you ever wondered just how many landing accidents could have been avoided if pilots actually knew the direction and velocity of the surface winds? Answer: Plenty!
Wind related accidents are not specifically tracked though they may be listed as a contributing factor. What does get recorded, however, in wind-related accidents is "pilot factor." This is a nice way of saying that the pilot screwed up! Determining the winds . . . Given the preponderance of wind direction and velocity information, it would seem unimaginable that a pilot would not have this information prior to landing! It is obtainable from in your pre-flight weather briefing or in flight from the ATIS/AWOS/ASOS. You can call the airport unicom frequency and obtain a wind report. Absent all of these sources, you can fly directly over the airport, at least 500 feet above the TPA (traffic pattern altitude), and look down for a windsock, wind tee, or tetrahedron. Between these many sources, no pilot should ever have a wind related accident assuming he or she has sufficient crosswind landing skills! An important lesson learned to late for this Cirrus SR22 pilot!
According to the NTSB Report, the gusts exceeded the limitations of the airplane, and as the airplane slowed, the pilot could not maintain effective rudder control. The airplane departed the runway surface and collided with a taxiway light and a runway sign. A 1-foot by 1-foot area on the lower, inboard portion of the left wing was punctured during the accident sequence.
The pilot suggested that the accident could have been
prevented if he had gone around for another approach. By the
time he realized that he was not going to be able to stop the
airplane on the runway, it was too late to execute a go-around
procedure. While the reported winds at the time of the accident were not particularly challenging, had this Cirrus pilot known what he was up against prior to touch down on the runway, the outcome would have likely been different. In summary, we should never "assume" that we know current winds at the airport. We should use whatever information is available to know precisely what the winds are doing whenever we are operating on or close to the runway.
We pilots are generally good citizens. We respect our airplanes and we respect other airmen in the sky. But some of us could be doing more in this regard! One thing that ALL of us could be doing is keeping our transponders on and switched to Mode C operation (altitude encoding). No, we do not have to check in with ATC, though that is always a good idea. Just keep the transponder turned on with the little switch turned to "alt". What happens when we squawk altitude? Two wonderfully beneficial things happen when we keep our transponders on and squawking altitude.
Active transponders with Mode C operating provides air traffic control with an enhanced image of our radar target on their screen. Rather than a dubious primary return which could be a flock of birds, the controller is able to confirm that we are, in fact, an aircraft. In addition, the Mode C feature of our transponder transmits our altitude. Together, these pieces of information enables ATC to relay our position and our altitude to other aircraft in the area. 2. TCAS Alerts:
They only work, however, when other aircraft have their transponders turned. Remember, of course, FAR 91.215 requires an operating transponder with Mode C in Class A, B, C airspace, within 30 miles of Class B, and above 10,000' MSL. Similarly, if your airplane is equipped with a transponder, it must also be turned on when in Class E airspace.
Flying recently with the pilot owner of one today's fast glass composite high performance aircraft left a lasting impression with me about pilot dependence on the autopilot! It had been about eight months since I had signed the owner/pilot off to solo his new aircraft. In boarding the aircraft with him for the first time since that signoff, I was confident that this owner/pilot had substantially improved his piloting skills over the ensuing months. He had taken several solo trips to New York, Atlanta, and other large city airports, so I figured that he had pretty well mastered his machine. Master he did . . . but it was the autopilot, not his piloting skills!
As we were climbing effortlessly at 1,500 feet per minute up through the clouds, I suggested we disengage the autopilot and fly the airplane by hand for our planned two hour training flight. What happened next was nearly tragic. I clicked the autopilot kill switch on the right hand side stick just as we were approaching our assigned cruise altitude. As I did so, I watched in amazement as we overshot our assigned altitude by 600 feet. Reminding the pilot/owner to descend immediately, he pushed the stick forward while still in climb power configuration.
I grabbed the throttle and immediately pulled it back to idle and leveled the airplane. Once straight, level and on course, I gave the controls back to the owner/pilot and suggested we change our planned training regime. It was clear in those brief few seconds that all of the previous experience my friend had in this airplane since I signed his solo endorsement was on the autopilot. The only hand flying he had done was the first 500 feet after each takeoff and the last 500 feet before each landing. "George" had done all of the other flying for him! Aircraft factories are partially to blame!
While these factory trainers could very well be right in terms of autopilot vs. customer piloting skills, this practice can have disastrous consequences later on. As was evident in the above described flight, continuous sole dependence on the autopilot leaves the pilot dangerously non-proficient when hand flying. Autopilots are marvelous devices, but beware!! Most pilots are fascinated by the marvelous workings of a properly functioning autopilot. With altitude pre-selects and localizer/glideslope coupling mechanisms, these electronic wizards reduce the pilot load to a casual ride in an over-stuffed easy chair.
Autopilots do earn their keep during long cross-country flights and on instrument approaches in nasty weather conditions. They magically lock on to the final approach course and steer us home. But . . . and this is a very big but. As my owner/pilot discovered, dependence on the autopilot robs the pilot of the proficiency he or she needs to safely hand fly the airplane. Allow too many flights to go by using the autopilot and a hapless pilot could find himself with more airplane than he can fly by hand. That spells danger with a capital "D". Remember, as far as autopilots are concerned, nothing can go wrong, go wrong, go wrong, go wrong, go wrong, go wrong !
If ever there was a time when the entire GA industry worked tirelessly together, it is at Oshkosh! Everybody from air traffic controllers to the port-o-potty movers ratchet up their finest demeanors to make the entire AirVenture celebration a memorable event for even the most timid pilots.
Begin your arrival planning NOW! Overnight accommodations: There is only one place where REAL pilots stay and that is in a tent! Throw your favorite pup tent into the back of the airplane along with an air mattress, a sleeping bag, and a change of sox and underwear, and you're good to go for the week. Where to park your airplane: You park in GAC (general aviation camping), where else? And you don't need a reservation. Come and leave any day of the show (except during air show hours in the afternoon). Place a page size piece of paper in your window with the letters GAC in big, black letters. Volunteer marshals will point you to the way. As for logistical camping support, you'll find clean, easy-to-reach showers, lots of places to purchase groceries, and ample fast-food stands throughout the grounds. Yes, you can cook beside your airplane! Be sure to plan one evening over at the Hilton. Located along the perimeter fence near the arrival end of Runway 9 (there is a big hole in the fence), you can dine on real plates and perhaps bend an elbow with some of aviation's greatest legends.
Flying in: The NOTAM provides you with easy to read maps, visual checkpoint, radio frequencies and simple procedures that will lead you directly to the runway threshold. The only rule is . . . pay close attention. You will do just fine. The controllers working AirVenture are the very best, most patient people in the world!
Far too many fatal GA accidents occur simply because the pilot was unaware of the stalled condition of the wing! And for many pilots, this results from improper primary flight training! In such cases, pilot victims likely never experienced a full stall break in the primary training. Instead, their CFI brought them to incipient stall phase (center graphic below) where the stall horn began to chirp, then instructed them to make an immediate recovery before the full stall occurred.
Regrettably, these improperly trained pilots seldom experience the kinesthetic feeling of a total loss of lift and resultant sensation of falling. So when this full stall inadvertently happens in real life, the sudden unfamiliar feeling of the floor dropping out from under them leaves them waggling their yoke or stick in vain hope of keeping their wings level. Not working because in aerodynamically ineffective ailerons, the hapless pilot rolls into a spin which, likewise, he or she has never before experienced. Given enough altitude, he may recover. Closer to the ground, however, spin-induced confusion may eat up the time that he needs to make correct control inputs. Having difficulty full stalling training aircraft? One logical reason for improper stall instruction is the inherent difficulty of stalling most training aircraft. Inherent, built-in stability (to protect the inexperienced pilot) makes it difficult to achieve a sharp full-stall break. Instead, the trainer tends to "hang" in an incipient stall phase pitch attitude with the stall horn blaring. This condition is more prevalent in the power-on versus power-off stall. Solution: Overcoming the built-in stall resistance in a training aircraft requires a more aggressive pitch up with sufficient airspeed to carry the wing beyond its critical angle of attack. Care, of course, must be used to not produce a "whip" stall which actually allows the airplane to slide backwards (much like a hammerhead maneuver) before the nose drops. Here again, proper training is required to produce the desired outcome!
The first thing a pilot may experience in his or her full stall break is the inherent difficulty of keeping the wings level. Simple fuel weight imbalances in the wings and/or left turn tendencies in a full break power-on stall will cause the airplane roll aggressively in one direction or the other. When this happens, the spin results. When properly trained, pilots learn to keep their eye "glued" to the slip/skid indicator ball located inside the turn coordinator (in most modern setups). Using the rudder pedals exclusively (not the yoke or stick) to achieve this is the key to spin prevention. Designated Pilot Examiners - Take Note! Given the continued frequency of fatal stall/spin accidents, be sure your pilot candidates demonstrate proper recovery from a full stall break rather than from an incipient stall only. Problem:
Thus, it is really up to individual flight
instructors, who know both their students and their aircraft, to
insure that their students learn and experience the full stall
break and proper recovery.
Spouses . . . do you wish you could track your partner's travels as he or she moves around the country in an airplane? Do you wish you had a graphic record of the last dozen or so flights you made? You can do this on http://flightaware.com/. Simply log in (it's free), enter the tail number or airline flight number. You will be able to track the flight live, or review the previous flights graphically. The FlightAware link has been added to the Over the Airwaves top banner.
Rightfully concerned over the 58 percent reduction in annual new pilot starts since 1979 and the rapidly aging condition of our current ranks of GA pilots, AOPA has reinvigorated its 10 year old "Be a Pilot Program." Operating under a new name, "AOPA Project Pilot," the aim of the program is to encourage AOPA member pilots to recruit new pilots into the system and then serve as their personal mentors.
While bringing new, non-pilots into the system is always beneficial, the real problem is and has always the fact that nearly 40 percent of each year's 80,000 to 90,000 new student pilots NEVER earn their private pilot certificates! The math is simple! Between 30,000 and 36,000 people who receive a student pilot certificate are lost to the system each and every year. Here is where the AOPA Project Pilot Program can have its greatest benefit.
This would happen simply by helping each new student pilot locate the very best flight instructors in their community. This act alone would have the dual effect of insuring that new students connect with the very best instructors in their community AND it would help to drive the weakest instructors and flight schools right out of business. In so doing, local competitive forces would be put to work to optimize the flight training industry. The benefits continue . . .
As this public perception of GA improves, due primarily to reduced perception of risk, a "snowball effect" of new pilot starts will begin to roll! In summary, it does little to recruit new pilots into a system, then subject them to much of the same deplorable training experiences that drives over 50 percent of them to quit before receiving their private pilot certificate. Let's all get out and support this program!
Some might call it a "Hobbs Choice" (a no win choice), the unsavory choice of deciding between hitting the trees or pitching up into a stall and resultant spin happens to pilots more times than we might imagine.
A witness, who observed the final moments of the flight, stated that the airplane's engine "just stopped." The airplane was then seen to travel across the Delaware River, westbound. At approximately 1305 hours, the airplane was observed by another witness to be paralleling a road at low altitude with the propeller rotating at low rpm. "The propeller then stopped rotating. The airplane then banked to the right and struck trees in a nose down, inverted attitude." NTSB Probable Cause Finding:
Given the outcome of this fuel exhaustion emergency, we would all agree that landing upright in the trees offers greater safety margins than stalling and rolling inverted in a nose down flight attitude. What is it about fatal stall/spin scenarios that, according to NTSB accident data, occur once a week in the United States on average? Do we pilots fail to understand the aerodynamic result of exceeding the wing's critical angle of attack? Do we not understand the importance of maintaining a coordinated flight attitude when approaching a stall? Is it because many of us have never experienced a fully developed stall followed by a deliberate spin at a safe altitude with an experienced instructor by our side? These are fair questions that deserve answers. Short answer: Most flight instruction gloss over stall/spin training with only enough guidance to satisfy the Practical Test Standards (PTS). Believe the sounding of the stall horn signifies the presence of a stall, recovery in most training exercises is begun far too soon. The student never has the opportunity to experience the feeling of a full stall. Nor does the student ever experience the dramatic sensation of a suddenly falling wing as the airplane rolls over into a spin. No, we do not have to stick our finger into a flame to know what a burn is all about. But, most of have suffered a burned finger at least once in our lives. Having experienced this painful sensation, most of us a VERY CAREFUL when working around fires.
What the airlines and corporate world call "standardized procedures," we in the GA community call "fly by feeling!" That is, we mash the throttle, rotate when it sort of "feels" read to fly, and pitch to an attitude that seems sufficient to clear the obstacles. In short, many of us do fly by the seat of our pants! Let's standardize our takeoff speeds! All takeoffs follow a standard profile. They begin with full power and brake release. Next comes rotation, followed by obstacle clearance, and ending with cruise climb. Imagine what would happen if we assigned specific indicated airspeeds to each of these takeoff phases. This can be easily accomplished by using the V speeds published in the aircraft POH. At brake release, we call out the increasing airspeeds until reaching Vr (rotation speed). Our initial climb is set precisely to Vx (maximum angle of climb) until clearing obstacles.
Once clear of obstacles, we commence our initial cruise climb by reducing pitch slightly to achieve Vy (maximum rate of climb). The final cruise climb phase is the only variable simply because V speeds change with altitude (Vx goes up/Vy goes down until reaching absolute altitude). When combined with performance data published in the POH, every takeoff should require precisely the same ground roll, every time. This should be task of every proficient pilot!
Proof of this was revealed to me recently as I was reviewing the logbook of an instrument student I inherited from a nearby flight school. This flight school provided him with all of his primary training and about 30 hours toward his instrument ticket. Here's what the logbook revealed . . . This flight student's primary and initial instrument instruction consisted of landings and instrument approaches at just a couple of nearby airports. This certainly provides opportunity to gain sufficient experience to pass the check ride.
Each of these 29 hard surface and 14 grass strips provide unique operational challenges. Most are very narrow, often sloping up or down hill. Many have obstacles and/or surrounding rising terrain. Several have right hand patterns. Most have no weather reporting, nor attended Unicom frequencies. Each has its own unique traffic pattern arrangement. Students who are taken to each of these 43 airports throughout the course of their primary and instrument training pass the checkride, too. More importantly, they learn how to fly!! The difference between just passing the checkride and learning how to fly could save your life!
Each training flight should include a different airport. In this way, the student is exposed to the hazards of unfamiliar terrain, the challenges of peculiar crosswinds, the challenges of narrow, slopping runways, and the unique layout of wind tees, socks and other wind direction indicators. Adding grass runways to the training mix provides REAL experience with soft fields, undulating runways, and nearby trees and other obstacles. This all adds up to preparing flight students for the many challenges that await them AFTER their checkride. In short, it teaches students how to fly rather than to simply fulfill the prescribed training requirements of a Part 141 syllabus or the listed elements in the Practical Test Standards.
The best place to start is to open your local sectional chart and have a conversation with your instructor. Identify ALL of the airports within 100 miles of your home airport. Indicate your desire to land at least once at each of these airports sometime throughout your training. If your instructor refuses, ask why. If his explanation does not make sense from a "learning to fly" perspective (rather than just passing the checkride), find a new instructor or flight school. After all, it is YOUR time, money, and life that's in play here! More importantly, you will become a more a proficient pilot and have a great time doing it!
There are three events or circumstances capable of dismantling even the largest airliner in flight. One is a mid-air collision, another is controlled flight into terrain (CFIT). And the third is a thunderstorm. As powerful as they are, however, thunderstorms are among the least understood of all flight risks!
Any pilot who has been forced to wait out a ground stop due to thunderstorms in the area understands the importance assigned to them by ATC. In short, a line of well developed thunderstorms has the ability to grind all aviation to a temporary halt, from puddle jumper to Boeings until they drift away. What should be our response to thunderstorms? Short answer . . . see and avoid. Unlike icing conditions that exist where you find them, thunderstorms are generally very easy to spot. The sky darkens, towering cumulous clouds soar high into the heavens with menacing protuberances and glowing lightning strikes. The best piloting solution is, don't go there!
Add to that the abundance of weather information products from convective airmets and sigments, to prog charts, and to NEXRAD depictions, the weather-savvy pilot knows precisely what he or she will be dealing with before commencing any flight.
Given today's technology, if a pilot bumbles into a thunderstorm, he was sleeping at the switch. Even the most insidious of all weather phenomenon, the dreaded imbedded thunderstorm (masked in surrounding clouds), is easily identifiable in aircraft with stormscope and radar.
So why is it then that we continue to encounter thunderstorm
related accidents. Why is it that even the big guys, like
the Air France Airbus A340 captain who chose
One word . . . impatience! The one true fact about thunderstorms is, most are short-lived. Wait 20 minutes and they will either dissipate or move out of your way. The second true fact is that they do kill. Jump inside an active thunderstorm in a light aircraft and the chances of survival are poor to nil. The more we know about thunderstorms, the better our chances of becoming old pilots. Also, the more we know about thunderstorms, the less time we spend waiting them out on the ground. The common element is knowledge. No, there is no automatic need to park your airplane in the hangar when thunderstorms are predicted along your planned route of flight. Given enough fuel and time, you can nearly always circumnavigate a line or field of thunderstorms. Nor is there good justification for launching into IFR conditions in the presence of imbedded thunderstorms. The ultimate decision rests on your ability to see and avoid, with your eyes, with spherics and radar, and with ATC assistance. You are the PIC. Be sure you make the right call!
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