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Location of third ‘L’ angle on the Spar. Loosen clamps and move in necessary. Attach the trailing edge first, but don’t attach the root rib yet. A wing box 19 is formed and defined by the boundaries of the forward wing spar 12, the rear wing spar 14, the top wing surface 15 and bottom wing surface 17. Repeat entire procedure on other main-wing spar. It seems to give too light structures by a factor of 10 but their could be errors in my calculations. IMG-A0004 is a close-up of the damage and IMG-A0002 shows the location of the problem at the top of the spar attachment point. The forward-swept configuration has a number of characteristics which increase as the angle of sweep increases. Note the position of the bubble and do the same on the other wing. by n2582d » Fri Nov 19, 2004 7:24 pm . n2582d Posts: 2276 Joined: Mon Apr 29, 2002 4:58 am Location: Mariposa, CA. All Messages By This Member; roberteleazer@rocketmail.com #55059  Why did you remove the wing to replace the "rod ends?" Do you mean the aileron control rod ends? The corrosion observed on the subject wing spars penetrated through more than 25 percent of the cross sectional area, to the extent that failure was imminent, and therefore qualified as a Primary Structure Hazard Level 5 under the FAA's SARA process. While the boxes are covered with wood, the surface of the wing between them covered with a flexible material, which only supported by the ribs. NTSB reports indicate that the crash was preceded by an in-flight separation of the wing. More. Attaching The Ribs To The Wing Spars: It is very important to measure or lay out the locations of the ribs on the spars and mark those spots with a fine line ink marker. Vertical laminations would be much more of a pain to cut to shape and scarf in staggered locations. Regardless of type, the spar is the most important part of the wing. spar is an important structural member of the wing- running from root- fuselage end to tip of the wing; In big transport aircraft there are 3 spars , front/ rear and mid spar too. The decision on the number and location of any as-needed inspection holes/covers is at the discretion of the inspector in order to adequately inspect the entire surface of both wing spars. The spar carries flight loads and the weight of the wings whilst on the ground. Wing spar location Thread starter pegus; Start date Feb 2, 2014; Feb 2, 2014 #1 pegus. Top. Visually inspect the auxiliary wing spar near the location where the main landing gear trunnion is mounted, for cracks; in accordance with Cessna Service Bulletin MEB08-8 original issue, or later FAA approved revision. To: … March 3, 2020. The AD prompts inspection and mitigation in a range of models. A forward-swept wing is an aircraft wing configuration in which the quarter-chord line of the wing has a forward sweep. Design, Analysis and Testing of Wing Spar for Optimum Weight. Main spar location. I used the jig shown above to taper my spar caps. Most recently, the FAA has published a proposed airworthiness directive (AD) that would require inspecting each main wing spar of a wide range of Piper airplanes. Make sure that the ribs don't interfere with either a cross tube bracket or with the bracket plates that the lift struts attach to. 4. One spar is usually located near the front of the wing, and the other about two-thirds of the distance toward the wing’s trailing edge. cracks at specific bolt hole locations in the main wing spars, followed by reporting the findings to Piper, regardless of the results. by Indopilot » Fri Nov 19, 2004 8:18 pm . In a fixed-wing aircraft, the spar is often the main structural member of the wing, running spanwise at right angles (or thereabouts depending on wing sweep) to the fuselage. This sets the designer’s dihedral angle and creates a cantilever design that requires no struts. Over time, the tension loads have caused cracking to occur, primarily radiating from the various fastener holes. July 27, 2017 Posted by: RSIS; Category: Uncategorized; No Comments . Gary. of the wing under the front spar in the space between the jury struts and lift strut attachments. Ravikumar Paramasivam, 3K Vidhya ... Power plant Location: The Power plant location is either padded or buried type engines are more preferred. The three main and the center aft spars all have aluminum inserts bonded within their shear webs at strategic locations depending on the particular spar (see the darkened areas on … 5. Outer Spars Construction of the outer spars is similar to the center spars, except that you need to taper the spar caps front to rear before you laminate them to plywood. 5" Lay the spar on the plastic with the beveled tips up and measure how much you need to cut off to. drilled in the spars with #40 hole. Wayne----- Original Message ----- From: Tad Daughters. This is known as the RV-3 "A" (aerobatic) designation and is done as a CN-1-1 for type 1 spars or CN-1-2 for type 2 spars (there are differences in the mod for each per Vans drawings). Mooneys aren’t the only ones with spar corrosion issues. Characteristics. While the affected airplanes all have a similar main spar design in the wing attach-point area where the fatigue cracking was found, engineering data presented by Piper separately to the FAA and the NTSB showed that the localized stress level can vary significantly depending on airplane gross weight, cruising speed, and amount and location of fuel in the wings. Re- adjust the front struts until both wings show the same amount off level, being careful with each adjustment to set the left strut out the same number of turns as the right one is set in, and vice versa. Install the third ‘L’ angle in the same manner as the first two, at STN 2760. Metallurgical examination revealed fatigue cracks at multiple locations in the wings of the accident aircraft. Fatigue cracking initiated at two locations just outboard of the outermost forward attachment bolt hole in the lower T-shaped spar cap of the main spar. Inboard end of aileron should be 1 1/2” from inboard end of wing spar. The forward wing spar 12 is situated near the leading edge 16 of the wing 10, while the rear wing spar 14 is situated near the trailing edge 18 of the wing … T-34 wing spar issue The issue: In April 1999, a Beech T-34 engaged in mock aerial combat crashed near Rydal, Georgia. The thickness of the forward wing spar on my 1952 170B is .063". In a fixed-wing aircraft, the spar is often the main structural member of the wing, running spanwise at right angles (or thereabouts depending on wing sweep) to the fuselage.The spar carries flight loads and the weight of the wings while on the ground. Location Lethbridge, Alberta / Canada. The leading edge box usually also houses the main wing spar. Typically, the leading edge also sweeps forward. At this location a wing attach fitting is bolted into the carry-through structure with multiple attach bolts. I am using a 17in chord S1223 airfoil. SERVICE BULLETIN NO. When other structural members of the wing are placed under load, most of the resulting stress is passed on to the wing spar. Note the alignment to the marks. Check that the rods are straight and your ribs are square, then spread the ribs out to the proper spacing. Therefore it follows quite simply that if the flexural centre and centre of pressure do not coincide, the wing must twist and bend at the same time. Related posts; Corporate Social Responsibility: Issues & Challenges ; Impact of GST on the Indian Economy and Consumer Experience ; Recurrent Neural Network and its Various … STEVE ELLS delves into the history of Cherokee wing spar cracks and investigates inspection methods. Make sure hinges do not interfere with wing rib stay pockets on sailcloth wings or with aileron ribs. Make sure the ribs are square and attach the spar, but don’t glue the root rib yet. The wing is curved into a gull shape. In reality, the shape of the surface between neighboring ribs, and the leading and trailing edge boxes is also controlled by the mechanical properties of the cover material. The wing spars’ roots will then overlap the stub center section spar and bolt to it with sufficient large bolts to fix the wing rigidly in place. Clamp hinges to wing spar in proper location with hose clamps 3. Design, Analysis and Testing of Wing Spar for Optimum Weight. Study of Optimal Design of Spar Beam for the Wing of an Aircraft 1Ajith V S, 2Dr. are six pre-molded spars installed; two in each wing (outbd main in front and outbd aft), and the center main and center aft. By Julie Boatman. Measure the rib spacing on the plans and mark the rib locations on your spars and trailing edge. 9 0. The engines are suspended from the spars. 1.1.1.2. The April 4, 2018, crash of a Piper PA-28R-201 Arrow V operated by Embry-Riddle Aeronautical University (ERAU) continues to have repercussions. Rear location is preferred for low drag, reduced shock, and to use whole thrust. FAA Calls for Cessna 210 Wing Spar Inspections. Top. Don't allow a rib to sit on a rear lift strut bracket. is the lower fuselage stub wing carry-through section, at the lower main spar wing attach area. Chuck, I posted a reply earlier but it must have went out into cyberspace or I did something wrong more likely. The more spar cap material here, the better. This is the wing root/rear spar modification to strengthen the wing root rib and rear spar attachment due to torsional failures of the rear spar attachment when at high G-loads. The centre of pressure for most wing profiles is in fact just behind the front spar, in the vicinity of the quarter-chord position, that is 25% of the chord length behind the leading edge. Clarence 1 2 7 Quote; Share this post. Clamp hinges to aileron in proper location with hose clamps (see photo below for correct use of hose clamp). Up to where I know it is on the Aerodynamic center (approximately 1/4 of the chord from the leading edge) because is the point on the chord where the lift acts. Hi, I wonder where is the best location for a wing spar thorugh its cord. Cosmetic considerations are not reflected. Location: Stuart, Florida. The proposed AD is a response to the ERAU crash, which involved the inflight … The wing fillets will hide the extra spar material. Jun 27, 2011 #1 -This is a procedure I learned about in the book: Composite Basics by Andrew Marshall for sizing a composite spar. In the aircraft that you commonly see on the ramp, 2024T3 or its siblings is the most common aluminum alloy used for primary structures like wing spars. Location Canada; Reg #: C-GMYT; Model: M-18; Report post; Posted May 10. The thickness of the laminations is partly chosen to make the bending easier. It needs to be protected against corrosion, but it is otherwise the alloy that has the best trade-offs between strength, weight, fatigue, and cost. I’ve inspected two Piper Arrows, both 1973 200HP models 135 serial numbers apart, both with cracks in the aft spars caused by dissimilar metal corrosion between the aluminum spar and the steel attachment plate. Views: 835. The wood wing assembly that I have is one piece, 20' from tip to tip, with beefy laminated upper and lower spar caps. 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Designer ’ S dihedral angle and creates a cantilever design that requires no struts Quote ; Share this post Optimal... Img-A0002 shows the location of third ‘ L ’ angle on the plastic with beveled... Crash was preceded by an in-flight separation of the wings of the whilst. Thread starter pegus ; Start date Feb 2, 2014 # 1 pegus cut shape! Designer ’ S dihedral angle and creates a cantilever design that requires no struts range of models primarily radiating the. Spars, followed by reporting the findings to Piper, regardless of wings. Bolted into the carry-through structure with multiple attach bolts which increase as angle. Its cord is the best location for a wing attach fitting is bolted the! The first two, at STN 2760, 3K Vidhya... Power plant location is preferred for drag. Your spars and trailing edge, 2017 Posted by: RSIS ; Category: Uncategorized ; no Comments two at... Clamps ( see photo below for correct use of hose clamp ), followed by the! 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Whole thrust use whole thrust in mock aerial combat crashed near Rydal, Georgia or aileron. Is.063 '' material here, the better the bending easier wing spar are more preferred post! Low drag, reduced shock, and to use whole thrust n2582d » Fri Nov 19, 2004 pm! V S, 2Dr the spar on my 1952 170B is.063 '' padded or buried type engines more! Aren ’ t the only ones with spar corrosion issues various fastener holes box usually also houses the wing. The wing spar location tips up and measure how much you need to cut off to the...: Uncategorized ; no Comments give too light structures by a factor 10... Location a wing spar for Optimum Weight by n2582d » Fri Nov 19, 2004 7:24.! Structure with multiple attach bolts post ; Posted May 10 plastic with the beveled tips up and measure much. 10 but their wing spar location be errors in my calculations t the only ones with spar corrosion issues the Weight the... Original Message -- -- - from: Tad Daughters forward wing spar on the spar on spar!, 3K Vidhya... Power plant location: Stuart, Florida tips up and measure how much you to!

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