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. Don't allow a rib to sit on a rear lift strut bracket. Views: 835. 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. 1.1.1.2. FAA Calls for Cessna 210 Wing Spar Inspections. Clamp hinges to aileron in proper location with hose clamps (see photo below for correct use of hose clamp). 5. Typically, the leading edge also sweeps forward. The AD prompts inspection and mitigation in a range of models. Repeat entire procedure on other main-wing spar. The April 4, 2018, crash of a Piper PA-28R-201 Arrow V operated by Embry-Riddle Aeronautical University (ERAU) continues to have repercussions. Top. 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. Do you mean the aileron control rod ends? Rear location is preferred for low drag, reduced shock, and to use whole thrust. SERVICE BULLETIN NO. Ravikumar Paramasivam, 3K Vidhya ... Power plant Location: The Power plant location is either padded or buried type engines are more preferred. 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. Location: Stuart, Florida. 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 … Wing spar location Thread starter pegus; Start date Feb 2, 2014; Feb 2, 2014 #1 pegus. This sets the designer’s dihedral angle and creates a cantilever design that requires no struts. 5" Lay the spar on the plastic with the beveled tips up and measure how much you need to cut off to. 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. Clamp hinges to wing spar in proper location with hose clamps 3. All Messages By This Member; roberteleazer@rocketmail.com #55059  Why did you remove the wing to replace the "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. It seems to give too light structures by a factor of 10 but their could be errors in my calculations. Inboard end of aileron should be 1 1/2” from inboard end of wing spar. Check that the rods are straight and your ribs are square, then spread the ribs out to the proper spacing. Hi, I wonder where is the best location for a wing spar thorugh its cord. cracks at specific bolt hole locations in the main wing spars, followed by reporting the findings to Piper, regardless of the results. Top. To: … The thickness of the forward wing spar on my 1952 170B is .063". Over time, the tension loads have caused cracking to occur, primarily radiating from the various fastener holes. 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. July 27, 2017 Posted by: RSIS; Category: Uncategorized; No Comments . n2582d Posts: 2276 Joined: Mon Apr 29, 2002 4:58 am Location: Mariposa, CA. 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 wing is curved into a gull shape. At this location a wing attach fitting is bolted into the carry-through structure with multiple attach bolts. Metallurgical examination revealed fatigue cracks at multiple locations in the wings of the accident aircraft. More. Gary. The thickness of the laminations is partly chosen to make the bending easier. 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. Location of third ‘L’ angle on the Spar. Jun 27, 2011 #1 -This is a procedure I learned about in the book: Composite Basics by Andrew Marshall for sizing a composite spar. is the lower fuselage stub wing carry-through section, at the lower main spar wing attach area. 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. I used the jig shown above to taper my spar caps. Note the alignment to the marks. 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. 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. Install the third ‘L’ angle in the same manner as the first two, at STN 2760. Cosmetic considerations are not reflected. of the wing under the front spar in the space between the jury struts and lift strut attachments. 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. 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. Clarence 1 2 7 Quote; Share this post. STEVE ELLS delves into the history of Cherokee wing spar cracks and investigates inspection methods. 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. Study of Optimal Design of Spar Beam for the Wing of an Aircraft 1Ajith V S, 2Dr. NTSB reports indicate that the crash was preceded by an in-flight separation of the wing. Related posts; Corporate Social Responsibility: Issues & Challenges ; Impact of GST on the Indian Economy and Consumer Experience ; Recurrent Neural Network and its Various … Regardless of type, the spar is the most important part of the wing. by n2582d » Fri Nov 19, 2004 7:24 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. 9 0. Note the position of the bubble and do the same on the other wing. Location Canada; Reg #: C-GMYT; Model: M-18; Report post; Posted May 10. Loosen clamps and move in necessary. Design, Analysis and Testing of Wing Spar for Optimum Weight. The spar carries flight loads and the weight of the wings whilst on the ground. 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. The engines are suspended from the spars. The more spar cap material here, the better. 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. 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. When other structural members of the wing are placed under load, most of the resulting stress is passed on to the wing spar. 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. 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. 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. drilled in the spars with #40 hole. The leading edge box usually also houses the main wing spar. Design, Analysis and Testing of Wing Spar for Optimum Weight. Vertical laminations would be much more of a pain to cut to shape and scarf in staggered locations. Main spar location. Make sure the ribs are square and attach the spar, but don’t glue the root rib yet. The proposed AD is a response to the ERAU crash, which involved the inflight … 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. 4. Characteristics. by Indopilot » Fri Nov 19, 2004 8:18 pm . March 3, 2020. 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). The wood wing assembly that I have is one piece, 20' from tip to tip, with beefy laminated upper and lower spar caps. The wing fillets will hide the extra spar material. Attach the trailing edge first, but don’t attach the root rib yet. Wayne----- Original Message ----- From: Tad Daughters. 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. 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. I am using a 17in chord S1223 airfoil. Measure the rib spacing on the plans and mark the rib locations on your spars and trailing edge. Make sure hinges do not interfere with wing rib stay pockets on sailcloth wings or with aileron ribs. 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 forward-swept configuration has a number of characteristics which increase as the angle of sweep increases. T-34 wing spar issue The issue: In April 1999, a Beech T-34 engaged in mock aerial combat crashed near Rydal, Georgia. Mooneys aren’t the only ones with spar corrosion issues. 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. Chuck, I posted a reply earlier but it must have went out into cyberspace or I did something wrong more likely. 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 … A forward-swept wing is an aircraft wing configuration in which the quarter-chord line of the wing has a forward sweep. Location Lethbridge, Alberta / Canada. On a rear lift strut attachments 4:58 am location: Stuart, Florida Beech t-34 in! Allow a rib to sit on a rear lift strut attachments Nov 19, 2004 8:18 pm this location wing... Spar wing attach area hide the extra spar material not interfere with wing rib stay pockets sailcloth! 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