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| WHAT'S NEW MARCH 2019 AOA HUD DISPLAY (front cockpit) This L29 is equipped with a dual display AOA system for pressurized aircraft. Both cockpits have Alpha Systems AOA Eagle display in addition the front cockpit has a Valkyrie HUD. This is one of the new systems that I am especially excited to use. Alpha Systems AOA has been a tremendous help not only with the AOA system but with the design and machining of other system parts. I highly recommend this company so visit ALPHA SYSTEMS AOA for a better explanation of their AOA products. http://www.alphasystemsaoa.com/ AOA SWITCH PANEL The Eagle AOA system requires the addition of a remote switch DUAL DISPLAY MODULE The dual display module basically is a splitter that sends signals to two AOA dislpays. We elected to install this box behind the rear cockpit instrument panel. AOA INSTALLATION This AOA system has all the whistles and bells. The IF module is the brains of the system and recieves inputs from the sensor module and airframe inputs through the IO module. The airframe inputs are for the gear and flaps and not only biases the AOA display they also supply optional audio warnings that can be programed to alert you of impending situations. The boxes are located under the aft right pedestal. Here is a link to the AOA system interconnect. AOA Schematic. SIGNAL RELAY The signal relays are used to convert (-) ground signals for active in the L29 to (+) positive signals for active as inputs for the IO module. Most aircraft manufactures use positive signals for active so the IO module is also designed that way. We use the relays as a work around so we can take advantage of all the whistles and bells the system has to offer. AOA PROBE The access door under the left pitot boom was removed and a doubler along with the AOA probe mounting plate was installed. The hole was lengthened to make installation and maintenance easier. AOA SENSOR MODULE The modifications to the left wing are essentially the same as the right with one exception, the AOA probe and sensor units are in the left wing. A mounting bracket to support the AOA sensor module was fabricated and installed just inside the AOA probe mounting plate. The AOA sensor module converts pressures to electrical signals so we can run wires through the pressure vessel instead of sense lines. RIGHT WING INBOARD END The connections for the mating of the wing are all in place as well as the flight controls. The right wing is ready for installation and will be set aside while the left wing is being worked on. FUEL PANELS INSTALLED With the internal build up complete the fuel panels are installed. The yellow sump drain fairing is located in the upper left of the picture. FUEL CAP I'm having a little fun with this one, I have installed a temporary sticker showing the fuel quantity as 208 gallons. The tank will only hold a little over 50 gallons so we will see how many visitors question the quantity. FUEL VENT The fuel vent is a small NACA scoop attached to the outboard end of the surge tank. SURGE TANK I'm sorry for the quality of this picture but it shows the surge tank and plumbing. Also if you look closely you can see the conduit for the GMU 22. ELECTRICAL CONDUIT The 1 1/4" electrical conduit is visible on the right side of the picture. The tube is sealed with two o rings so the tube may move with wing flexing and expansion and contraction without breaking the seal. A 3/8" conduit was installed aft so the wiring for the GMU 22 unit could be segregated. Both conduits are grounded to the airframe. RIGHT WING BOTTOM Through the fuel panels on the bottom of the wing we can install the baffling, flapper valves, electrical conduits, sump drain, fittings for venting and surge tank return. In addition the fuel lines for the wet wing and the external tanks will be installed with check valves through the hole for the pylon. RIGHT WING TOP The right wing is out of the paint booth ready for buildup. The large hole will be used to install the surge tank plumbing, the GMU 22 unit, pitot static boom and the wiring harness for the outboard wing. The next hole inboard is for the fuel cap. The inboard hole will be used to install the wiring harness, pressure relieve valve, pressure switches and the fuel lines for the wet wing. DECEMBER 2018 BEFORE & AFTER The before & after drawings represent some of the modifications we have made to clean up the airplane. Here is the top ten list: If you're interested, click on this hyperlink to download a PDF copy of the Before & After. NOSE CONE Sanded after layup and ready for final fit before paint. NOSE CONE MODIFICATION The nose cone had crazing and needed some restoration work. After sanding it down the decision was made to follow the normal curves to bring the nose to a point. The picture shows the nose cone with a foam core added to the tip, shaped and ready for layup. LEFT WINGTIP TRAILING EDGE The wingtip trailing edge is in line and straight with the aileron trailing edge. I was thrilled to see that. LEFT WINGTIP After the layup we did a test fit and it looked great (but I am prejudice). A fairing, with a small cavity incorporating an aluminum endplate with nut plates, is there to support the LED NAV/ACL. Additionally a stud, for the static discharger, is mounted to the endplate. RIGHT WINGTIP BONDING STRAP The bonding strap was primed before assembly and is used as a barrier between the aluminum and the fiberglass to prevent galvanic corrosion. Utilizing the foam core fiberglass construction method the tip is bonded to the bonding strap gaining the majorityof the strength through the 7/8” holes running the length of the tip. We pull tested a prototype to hundreds of times it’s possible G loading and could not get it to fail. In retrospect we could have saved a few pounds by not using so many layers of fiberglass. LEFT WINGTIP WITH AILERON FENCE Fabricating the bonding strap for the left wing. Our goal was to have a wingtip that would offer some efficiency and somewhat keep the lines of the L29. After much research a modified Hoerner wingtip design was selected. Another goal is to increase the roll rate so we incorperated a removable aileron fence that should accomplish this. LEFT WING BOTTOM SKIN Test fit of the stress panels in the wing. STRESS PANEL WITH THE GASKET. The panels will be installed using Garlock 3000 gasket material. INTERNAL VIEW OF THE RIGHT WING This is a shot of the baffling and doublers installed on the inboard rib to seal the end of the tank. The fuel pump and other fixtures will be mounted on this rib. STRESS PANEL WITH NUTPLATES INSTALLED Stress panels to carry the loads were designed and fabricated from 2024T3. To carry the loads we are using NAS8803A3 titanium screws and NAS1474 sealed nutplates. Many thanks to Janssen Machine Company in Barnesville, Minnesota for machining the panels, they did an outstanding job. Access holes were opened up to facilitate access to the areas between the ribs. Baffling, flapper valves, pumps, tube seals and electrical conduits will be installed. The modification to the fuel system will provide about 20% more fuel than the external tanks, approximately 100 gallons. This will allow extended range without the drag of the external tanks. The use of the external tanks is still possible but if all the tanks are utilized a larger engine will be required to lift all the weight. I plan on installing a CJ610-8A after flight testing all the other modification made to the airframe. With the new engine I plan on cruising above RVSM airspace to increase both speed and range. If you’re interested, click on this hyperlink to download a PDF drawing of the fuelsystem. MARCH 2018 TAXI TEST
It
was a beautiful day in March so we rolled her out and took her for a short taxi
test. Had to laugh at myself, even though I had hydraulic toe brakes I found I
was still using the rudders as you would taxing a normal L29. It was a joy to
taxi and I had a smile on my face for the rest of the day. The work has started
on the wings; seems I have to have wet wings.
OCTOBER 2017 AIR CONDITIONING & PRESSURIZATION Modifications were made to improve the air conditioning and ventilation system. The main goal was to conserve and optimize the limited resources of the L-29’s airconditioning system. Listed below are some of the prominent modifications: JUNE 2017 FRONT SEAT A lot of work was put into the seats. Here are a few of the modifications: FRONT RIGHT The side panels on the right side fit just as well and give the cockpit that finished look. FRONT LEFT Harry Unger from Diamond Interiors did a wonderful job on the interior. The side panels fit like a glove and the red stitching is subtle but it really makes a huge difference in its appearance. He also made a pouch to store the control lock and performance QRH. FRONT PANEL The avionics are installed and partially configured. The wings are not mated so there is no heading reference yet. The flight controls and floor panels will be installed after the canopies are finished. FRONT PANEL, BEFORE PERSPECTIVE. REAR PANEL The rear cockpit has a full panel but has limited control of systems and radios. BOTH PANELS Both cockpits have integral lighting where possible and post lighting where it is not. The emergency lighting is dimmable LED flood lighting. FLIGHT CONTROLS Both sets of flight controls are finished and are waiting to be installed. The grip is installed on a shaft with bearings that allows it to line up with the pilots wrist. RUDDER AND BRAKE PEDALS The new pedals use the shaft from the original pedals. They allow hydraulic toe braking in addition to rudder control. The manifold attached to the flight control base was the answer for the hydraulic line routing. Also to resolve a clearance issue with the new pedals new tie rods were also made. SEPTEMBER 2016 AUTOPILOT
The avionics harness is complete and installed in the
aircraft. The remote avionics boxes will be installed next followed by the
instrument panels and panel mount equipment. The autopilot pitch and roll
servos are installed on a tray just below the aft seat. Here is a link for the
overview of the avionics architecture.
The autopilot servos were offset so their push pull tubes
will not interfere with the flight control push pull tubes. Here is a link to
the autopilot interconnect.
The autopilot has the capability of auto trimming the
elevator. To take advantage of the auto trim function we designed and built an
electric elevator trim servo by combining a clutched gear reduction unit with a
stepper motor. We now have manual and
electric elevator trim as well as auto elevator trim with the autopilot
engaged. The servo can be programmed using a laptop computer to get the desired
rate change. Brackets were fabricated and the trim servo was installed to work
with the bellcrank on the aft pressure bulkhead.
ELECTRIC SEATS
I had to have electric vertical adjustable seats. We
selected a linier actuator that would withstand the g loading and adapted a
stepper motor to power it. A brake was installed so the motor could be
deactivated, when not in use, and the seat would remain in its current
position. The controller for the motor and brake is located just aft of the
seat rails.
Here is a close up of the aft seat control box. One of the
nine pin connectors goes to the actuator assembly and the other may be hooked
up to a laptop to change the speed. Here is a link to the schematic for the
seats.
JULY 2105 HOT SECTION INSPECTION
We had an issue on the first
engine run, the throttle was unresponsive. After some investigating nothing
obvious was found so we elected to try another run with the isolation valve on.
That solved our problem, the throttle was exercised with the valve on and when
it was shut off the throttle response was normal, the engine ran great. No
further issues were found on the subsequent runs.
This is a view looking into
the number 1 burner can from the compressor. The fuel nozzle is also visible in
the center.
The cleaned fuel nozzle is
visible in the center of the assembly.
This is the number four
burner can assembly built up and ready to be reinstalled on the engine.
This liner was cleaned in
the Gunk tank overnight.
Looking up the combustion
liner you can better see the carbon buildup. Note the carbon narrowing of the
air holes. Also the airplane was on display in May at the local airport with no
engine covers; that is dead grass at the 9-10 O’clock position. I will be using
the engine covers more.
The burner cans were
disassembled for inspection. The top combustion liner has been cleaned and
ready for inspection. The bottom liner shows some evidence of carbon buildup,
it is much more apparent in the next photos.
The turbine section looked excellent.
A borescope inspection
indicated carbon build up on the combustion liners so the burner cans were
removed for a closer inspection.
DECEMBER 2014 FORWARD LEFT CONSOLE Exciting times, with the main harness complete and the LRU's installed we powered up the electrical system for the first time in twelve years. NO SMOKE...... and just a few minor surprises. FORWARD THROTTLE ASSEMBLY
The throttle assemblies were
rebuilt and modified. A grip was fabricated with a new paddle switch design for
the speedbrakes and a TOGA switch. In addition, a housing was fabricated that incorporates
a passage way to conceal wires and support a remote ident switch.
REAR THROTTLE ASSEMBLY
The rear throttle assembly
was redesigned similar to the forward one but for simplicity, the speedbrake switch was designed out.
FLAP/ENGINE CONTROL BOX
The Flap & Engine
Control Boxes were redesigned and cleaned up. With few exceptions we incorporated
a "lights out design" for all the boxes with a remote test function. The boxes
were designed to be Line Replaceable Units (LRU) with quick release connectors and fasteners.
START/FIRE TEST PANEL
This panel is a new panel
installed outboard of the forward throttle. As with all of the boxes a circuit
board was designed for each specific application to allow a remote test function
of all the lights.
OCTOBER 2014 ELECTRICAL CONTROL PANEL (ECP)
The electrical
system has been redesigned. The ECP is used to control and monitor the system. Precision
Dial, located in Kalamazoo MI, did an excellent job on the silk
screening of our panels. The ammeters and voltmeter are from the same manufacturer but have
different appearances. Unfortunately; the manufacturer does not offer
meters with the same appearance, we were not expecting this one. The
panel works well but we will have to work on a fix. OXYGEN BOTTLES DOT oxygen bottles are
installed with new clamps fabricated from stainless steal. NOSE GEAR WELL
Oxygen and
nitrogen filters, check valves and relief valves installed in the nose gear
well.
NOSE GEAR WELL Hydraulic and oxygen lines are
installed in the nose gear well. RIGHT MAIN
The Cleveland brakes are
installed and plumbed through a shuttle valve that will allow the brakes to be
actuated by two independent means.
MATED COCKPIT & CENTER SECTION
The cockpit is mated with
the center section. The blue pads are to protect the paint from hangar rash. She
is starting to look like an airplane again.
REAR BULKHEAD OF COCKPIT SECTION
The Heat shield, connectors
and lines for the pitot static system are installed and ready for mating of the
cockpit with the center section.
MARCH 2014
HYDRAULIC PANEL
The panel was redesigned so
the refaced gauges are easily visible and the emergency extension valves were moved
outboard. (Starting to see the light at the end of the tunnel even though it
is dim, it is visible.)
RIGHT FRONT CONSOLE
Hydraulic and pneumatic lines
are installed in the redesigned console.
HYDRAULIC SYSTEM
The system is complete in
the cockpit section and pressure tested. New accumulators were installed with
metric to Schrader valve conversions. The original check valve in the
accumulator fill line was replaced with an AN6280-6 check valve and a solenoid
valve. This will facilitate easier filling and prevent back flow to the
reservoir.
PNEUMATIC LOW PRESSURE
BOTTLE
The 1.5L bottle, relief
valve and the 3ATM pneumatic regulator are installed just under the rear pilots
left foot.
LEFT FRONT CONSOLE.
The 50ATM pneumatic
regulator is mounted just aft of the forward pressure bulkhead and the oxygen
regulator is mounted just below the oxygen valve. The oxygen and pneumatic
lines are stainless steel that will have color bands for identification. We ran
-4 hard lines for the pitot static system, black with color bands. The
hydraulic lines are gray.
PNEUMATIC HIGH PRESSURE
BOTTLE
The front canopy seal is the
only user of the main pneumatic system. A cradle was fabricated to secure the
small high pressure bottle and relief valve. This picture is of the inside of
the nose gear well, right side.
OXYGEN & PNEUMATIC SERVICE PANEL
A stainless steel plate was
installed to avoid wear & tear from servicing.
NOVEMBER 2013
The painting of the cockpit section is now complete; we are
very pleased with the end result. The paint will cure awhile before moving it
to the hangar floor where the reassembly will start.
Things going much better now. The silver has been applied
and ready for the other colors.
Ops; the sealing primer was applied but somewhere in the preparation
the surface was contaminated causing fish eyes in the paint. The suspected culprit
was lubricant from contaminated gloves. Changing gloves every time we touched
the rotisserie seems to have solved our problem. It took a day to decontaminate
and sand the sealing primer off. Once again we are ready for the sealing primer
again.
Many hours of preparation was spent filling and sanding away
small imperfections. The final coat of sanding primer has been sanded and is
ready for the sealing primer.
The interior of both cockpits have been painted light gray
and taped off. The gear well, battery compartment and baggage areas are ready
for their final color, the same bright white as the main gear wells.
SEPTEMBER 2013 TimeTrac
TimeTrac is a great tool to help keep accurate maintenance
records, component times, cycles and landings. It is a combination of
hardware (an onboard computer) and software (installed in your personal
computer) that will be used in concert with the AAIP for this aircraft. The onboard
computer receives serial data from the aircraft GPS navigation receiver and
records a series of flight "events". These events are power-up,
takeoff, landing and power-down. When an event is recorded, the associated
time, date, latitude and longitude are stored as well. All of the records are
saved in the hardware until downloaded to the software installed on your
personal computer. The process is simple and takes just a few minutes to
complete. Once downloaded, the aircraft maintenance records and component items
are updated. I would highly recommend TimeTrac to anyone who has an aircraft
with time or cycle limited items. Thank you P2 Aviation Technology
for all your help.
Garmin's G3X flight display system. After evaluating many good systems the Garmin G3X flight display system was determined to be the best fit for the L-29. Garmin's X Team recently released software changes (Thank you very much X Team) that now allow mach speeds to be displayed. The picture above shows the upper limit of the L-29's performance envelope at 5000'. Notice that the barber pole is at 443kts and the mach limit speeds can be seen to the right side of the airspeed tape. They represent the maximum mach with external stores (MFC) and maximum mach clean (MMO). The picture above shows the upper limit of the L-29's performance
envelope at 18,000'. Notice that the barber pole represents the maximum mach operating limit (MMO) .75M, which happens to be 363kts IAS at 18,000'.
The G3X can also display
other reference speeds for mach. For example; the best rate of climb is
displayed both in kts (VY=189kts.) and mach (MY=.35M). Notice at 5000' MY is a
higher indicated airspeed than VY is.
At 18,000’ notice MY is a slower indicated airspeed than VY. The
Reverence VLE is for landing gear extended speed.
This G3X setup page is
utilized to enter the desired speeds.
JULY 2013
The decision was made to install a glass cockpit; so completely
new instrument panels and support structures were fabricated. They can easily
be removed for hole cutting and paint. A two or three screen Garmin G3X system
will be installed. With most cockpit modifications nearing completion we are
looking forward to getting it into the paint both.
A Garmin GTN 650 will be centered in the glare shield with
the annunciator panels on either side. The panel on the left will be home for the
flight instruments and environmental controls and indicators. The right panel
is for engine instruments. Two eyeball vents will be installed with a
blower.
The rear panel is constructed similar to the front and also
tilts at 19º.
The rear panel will contain a single Garmin GDU 370
display and the glare shield will only contain an annunicator panel.
Built avionics trays in right aft console under the instrument panel. The trays can be easily removed or reinstalled.
A two speed blower was installed that will supply air from a
NACA scoop on the belly or re-circulate cabin air. I've melted too many times
in this airplane and believe this modification will work wonders.
MARCH 2013 Aft console; modifications are complete which include new side panels. The four holes are for headphone jacks, oxygen regulator, throttle and the flap box. For serviceability all the components will be secured using Camlocs. Work has started on the instrument panels. Front left console; modifications are nearly complete. The seven holes are for headphone jacks, pneumatic & voltage adjustment panel, oxygen regulator, oxygen valve, throttle, start & fire test panel, the flap box and the pitot heat & selector panel. Front right console; modifications are in progress. The three panels/compartments in the picture are avionics (left), hydraulic and the circuit breaker panel (right). For serviceability reasons the avionics compartment was hinged to provide easy access and is secured with two Camlocs. Again for serviceability the circuit breaker panel was hinged for easy access. Both the circuit breaker panel and the bus control relay panel (below the C/B panel) can be easily installed after assembly. MARCH 2012 RTO AND THE SINGLE ENGINE EXPERIMENTAL JET. Click on the link above for an article about rejected takeoffs. The doors are closed with the latches installed for the picture. The latches will be riveted in after paint. The correction unit that sat on the very aft of the console was relocated under the console. This made room for a cubbyhole for the stuff one needs on those longer trips. A one inch lip was added to keep items from sliding off or forward. The right aft console is almost complete. The doors are spring loaded to open. For serviceability the bins were designed to be easily removed. It is great to have friends. Here’s Luke driving rivets on the rear console. He has helped me out immensely on this project. FEBRUARY 2012 The work on reconfiguring the cockpits has started. Pictured above is the aft right console. The system gauges and valves were either removed or relocated. The forward opening will accommodate a lighting panel plus a panel available for future use. Camlocs were installed to facilitate quick installation/removal. The center opening will have a hinged door with a bin large enough to store two water bottles and snacks, nicknamed the “cooler”. The aft opening will also have a hinged door and a large bin, nicknamed the “glove box”. DECEMBER 2011 With the installation of Cleveland brakes the demand for nitrogen is greatly reduced. The two large high pressure nitrogen bottles were replaced with one small bottle. With that extra space available it was decided to move all the items in the nose section below the top platform which made a nice space for a baggage compartment. A .050” doubler was installed along with access doors. Work has started on reconfiguring the cockpits. The old battery box location was utilized for a tool box. There was some corrosion issues with the old battery box so we removed it and fabricated a complete new box. Great place to store the jack pads, fuel wrench and other misc. tools & service items. Major changes are planned for the electrical system, download the particulars here. To accommodate some of the changes the old transponder bay is being utilized for the new battery box location. The box was extended to enclose the new Eaton battery relay and hot battery bus. To clean up the exterior a new cover for the new battery box will be fabricated without an access door or humps. An access door was added so that the battery can be disconnected without removing the cover. The access door on the left is the battery disconnect access door. A recessed circuit breaker panel is located on the right. The panel will have a hinged clear plastic door to view the hot battery bus circuit breakers easily during preflight. JUNE - JULY 2011 The front center section with the fuel tank and intakes installed. The majority of the work on the center section is complete (all the big pieces are re-installed). The daunting task of doing the same thing to the cockpit is now being started. The front center section with the intakes installed. The intakes were powder coated white. They look great but it was a real challenge to re-install them. The rear center section with the fuel tank and intakes installed. The rear center section with the intakes installed. The powder coating is so bright it glows. It was such a problem when it came time to re-install the intakes that I would have to think long and hard before I would do it again. Replaced the aluminum electrical channeling with stainless steel. Top of the rear center section prior to installing the fuel tank. The throttle and fuel cut-off controls in the aft left of the center section. The aft lower portion of the center section prior to installing the fuel tank. A closeup of the flight controls in the aft lower center section. MAY, 2011 Forward Center Section: The center section is being readied for the installation of the intakes and fuel tanks. The wiring harnesses and every other component or item has been reworked, replaced with new or newly fabricated parts. The green and black wires on the left is a test harness used to actuate the solenoid valves for the flaps, speedbrakes and landing gear during testing. Forward Center Section: Ridged -4 lines were run for the pitot static system. Outboard Left Wing Stub: The AN fittings close to the leading edge are lines for the pitot static system. The wiring harnesses are installed. Working on installing the micro switches for the flaps. The flap actuating cylinder has been exercised a number of times with no problems noticed. Aft Left Center Section: The white pads are very high temperature ceramic blankets, for the fuel tanks, replacing the original felt pads. The -6 line, from the left wing root that runs under the pad to the location of the original transponder antenna on the firewall, is for smoke oil. Also notice that the fuel cutoff cable has been replaced with a Teflon lined cable. Aft Center Section: The hydraulic mule was hooked up to the hydraulic system. A few small leaks were found and one OH $!##, one landing gear would retrack while the other would extend. Got back into the manuals and traced the lines down. Found two lines switched on the left main, swaped them and everything worked as it should. Not quite as exciting but it does seems to work better this way. Left Main: Many thanks to Cleveland Wheel and Brakes for all their help on the wheel and brake conversion. Work is progressing with the conversion, more information will be posted later this summer. JANUARY, 2011 Left Gear Well: All the major components are installed now. The landing actuator was not connected so the gear can be swung by hand easily. Need to check for interference problems with the new Cleveland Brakes installed. Right Gear Well: This gear well has all major components installed also. Will start working on the wiring harness and the pitot static lines. Left Inboard Gear Door Actuator: Need to get the gear doors finished. Left Flap Actuator: Started working on the flaps. The center section is coming along but is a long way from being finished.................. DECEMBER, 2010 Left Gear Well: The fluid lines are installed, now the actuators and other components will be installed next. Left Outboard Gear Well: This is the view without the actuating cylinder and associated components. Left Inboard Gear Well: Installing the fluid lines was much easier than the right side. NOVEMBER, 2010 Right Gear Well: The fluid lines are installed (finally). The wiring and components will be re-installed after the fluid lines are installed in the left gear well. Right Outboard Gear Well: This is the view without the actuating cylinder and associated components. Right Inboard Gear Well: Quite the maze......... it took a considerable amount of time to install all the lines and leave enough room to eliminate chafing. OCTOBER, 2010 Forward Center Section: Re-installing components back into the center section. Notice the AN "B" nuts, they are lines for Cleveland brakes. Aft Center Section: Replaced all bearings for the flight controls. Right Gear Well: Manufactured aluminum crush gaskets (16 ONL 3882) Right Main: Fabricated and installed an axle to accommodate Cleveland Wheels & Brakes. Also, notice the servicing port on top of the gear leg has been changed so it may be serviced with standard Schrader valve fittings. SEPTEMBER, 2010 Doug Weske delivered a freshly restored L-29 to its new and very excited owner, Andrew San Marco. N699AS is now based at KGON. AUGUST, 2010 Went a little crazy, rolled the center section of 591378 out of the paint booth. Ready to start reinstalling all the overhauled or new components. July, 2010 Started L29 Support, Inc. to help support the continued flight of the Aero Vodochody L-29 Delfin. | ![]() | |||||||
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