SERVICE BULLETIN 31 - Extruded of Main Spar-Rev00

The affected airplanes are not covered by warranty. However, I.C.P. Srl will send only the parts needed for the Service Bulletin application for free. 7.1. Contacts Telephone : (+39) 011 9927503 Website : http://www.icp.it Email : info@icp.it PEC : icpsrl@pec.it C.C.I.A.A. : 00611190059 VAT number E C.F. : (IT) 00611190059 Address : S.P. 16 km 15,150 Castelnuovo Don Bosco, Italy, 14022 SERVICE BULLETIN - SB031 Doc. No.: SB031 Revision: 00 Rev. Date: 13/12/2023 Page: 7/14 FSB01 7.2. Support Parts and additional information about installation can be requested to the National Dealer or directly to I.C.P. Srl to the email info@icp.it. 7.3. Material - Price and Availability The following kit of parts is supplied by I.C.P. Srl for the application of the present Service Bulletin. If additional parts (instruments, equipment) are required, send accordingly a request to I.C.P. Srl at info@icp.it. Parts Price Ø3.2 rivets Parts free of charge from ICP side, excluding the shipping and the installation work Ø4.0 rivets Ø4.0 steel rivets AN3 bolts, nuts, washers for the spar AN3 bolts, nuts, washers for Flaperons reassembly AN5 bolts, nuts, washers for wing reassembly Cotter pins for Flaperons hinges reassembly SA089-2 (for Savannah Model 51 and Bingo Model 52) SA090-2 (for Savannah Model 51 and Bingo Model 52) 2x raw extruded length 420 mm (for Savannah Model 50) Table 3 The customer will receive the parts for free by I.C.P. Srl, the only costs he will sustain are the shipping fees and the manual labor for installation. 8. Tools and Equipment The tools needed are the following: - Drill with drill bits Ø3,2 [mm], Ø4,0 [mm] and Ø6,0 [mm]; - Clecos for Ø3,2 [mm] and Ø4,0 [mm], with Pliers for Clecos; - Riveter; - Wrenches for AN3, AN5 and - Torque wrench; - Equipment for painting, if required. SERVICE BULLETIN - SB031 Doc. No.: SB031 Revision: 00 Rev. Date: 13/12/2023 Page: 8/14 FSB01 9. Variations None. 9.1. Weight and Balance Not changed. 9.2. Electrical load N/A 9.3. Interchangeability N/A 10. Accomplishment Instructions No specific documents of instruction have been issued. Follow the sequence described in Chapter 10.2. 10.1. Reference documents Refer to the Spare Parts Catalogue and Construction Manual, specific for each aircraft. Eventually, the Technical Specification S0222 could be useful to assist during the reassembly of the wing on the fuselage. SERVICE BULLETIN - SB031 Doc. No.: SB031 Revision: 00 Rev. Date: 13/12/2023 Page: 9/14 FSB01 10.2. Instructions Drain all the fuel from the Collector Tank sump, then unmounted the wings from the fuselage. Remove the cover at the wing root (top of the cabin), unriveting it and then proceed to detach all the systems connections (fuel, electrical, Pitot). Remove the wings by unscrewing all the AN5 bolts of the spar attachments to the cabin and the ones of the struts. Detach the Flaperons from the wing, removing the castle nuts with cotter pins of the hinges. Once each wing has been unmounted, position it on a table and prepare it for the work. To access the area of intervention, it is necessary to partially remove the upper skin of the wing. First, unrivet the L.E. skin: drill the pop rivets Ø3.2 [mm] and Ø4 [mm] with relative drill bits, then pull the skin up like shown in Figure 3 (shown the right wing, do symmetrically on the left wing). Then, unrivet the top skin: like before, drill the pop rivets and separate the skin from the spars, the ribs and the stringers below (if present) up to the last stringer before the rear spar (shown in Figure 3). ATTENTION: Be very careful not to buckle the upper skin, while lifting it up. Figure 3: Right Wing, partial opening of the upper skin, to access the area of intervention FWD Right wing TIP ROOT Area of intervention SERVICE BULLETIN - SB031 Doc. No.: SB031 Revision: 00 Rev. Date: 13/12/2023 Page: 10/14 FSB01 Figure 4: Right Wing, area of intervention from the front Before unmounting the extruded part, remove the front strut attachment plates (same on both the left and the right wing). Those are bolted with AN3 to SA089-2 (left) and SA090-2 (right). To remove the part SA090-2 from the right wing (SA089-2 on the left wing), drill Ø6 [mm] just the tail of the solid rivets (from the front of the wing, like the view of Figure 4), in order to remove only the bulbous ends of the rivets. Then, drill Ø4 [mm] centered to the axis of the rivets, up to completely remove them. Pay attention to not excessively press the rivets when drilling, to not bend the main spar web. After the work, use a vacuum cleaner to clean all the shavings and leftovers of the rivets, from inside the wing. NOTE The extruded parts SA089-2 and SA090-2 are provided with the kits supplied by ICP for the specific Savannah Model 51 and Bingo Model 52. For the Savannah Model 50, in the specific kit supplied, are present 2 raw extruded parts, of 420 [mm] of length, that come without holes and without chamfers. Cut the parts in the correct shape and drill the holes in matching position SA090-2 (right) SA089-2 (left) Right wing Strut attachment SERVICE BULLETIN - SB031 Doc. No.: SB031 Revision: 00 Rev. Date: 13/12/2023 Page: 11/14 FSB01 Figure 5: Right Wing, area of intervention from behind Now, install the new SA090-2 on the right (SA090-2 on the left) applying the following sequence of operations:  Install the new set of AN3 bolts with self-locking nuts and washers, like shown in Figure 5 and;  Rivet the extruded part with Ø4 [mm] steel pop rivets to the main spar web. ATTENTION: the head of the rivets must be oriented behind the spar, therefore the tail of rivets must be pressing on the extruded part, like shown in Figure 5;  Reinstall the front strut attachment plates with the proper sequence of bolts, washers and self-locking nuts;  Close all the AN3 bolts/nuts at 6 [Nm] with a torque wrench. CAUTION The bolts and the self-locking nuts (“Nyloc”), once unmounted, must be replaced by new ones. Always assemble the bolted connections with a light closure torque and then, finally, apply the proper closure with the torque wrench Right wing SERVICE BULLETIN - SB031 Doc. No.: SB031 Revision: 00 Rev. Date: 13/12/2023 Page: 12/14 FSB01  Rivet entirely the top rear skin of the wing;  Rivet entirely the top nose skin of the wing. ATTENTION: The riveting sequence must follow a certain order, as explained in Figure 6, also according to the Construction Manual of the airplane (Wing Chapters); Figure 6: Right Wing, sequence of riveting top skins  If required, paint the skin as original color;  Reinstall the Flaperons according to the Construction Manual of the airplane (Wing Chapters). AN3 Bolts with castle nuts and the new cotter pins present in the kit;  Reassembly the wing, bolting the spars to the cabin attachment points, connect and bolt the struts;  Reconnect the wing Flaperons to the Flap and roll control system;  Close the AN5 bolts of the wing attachments at 20 [Nm], with the torque wrench;  Reconnect the fuel system (pipes, hoses, metal clamps);  Reconnect the wing electrical wires are properly connected;  Reconnect the pipe of the Pitot tube to the cabin pipe. SERVICE BULLETIN - SB031 Doc. No.: SB031 Revision: 00 Rev. Date: 13/12/2023 Page: 13/14 FSB01 10.3. Verifications Verify all parts are present and correctly installed, bolted, riveted, before closing the skins. Verify all bolted connections properly closed with the torque wrench. Verify all rivets correctly installed when skins are closed. Verify the wing is properly positioned, spars attachments to the cabin frame and struts attachments are bolted correctly; Verify wing Flaperons are correctly interfaced with the control horn. Verify all bolted connections are properly closed with the torque wrench, Construction Manual of the airplane (Wings attachment to Fuselage Chapter) Verify the fuel system (pipes, hoses, metal clamps) is properly connected. Verify the wing electrical wires are properly connected. Verify the pipe of the Pitot tube is properly connected to the cabin pipe. 10.3.1. Ground test Verify the correct motion of the Flaperons coherently with the stick. Verify the correct function of the fuel system without leakages in cabin fittings. Verify the correct function of the wing electric system (wing lights). Verify the correct function of the Pitot tube by blowing lightly and reading the Airspeed Indicator increase. 10.3.2. Flight test Workshop flight for overall check. 10.3.3. Documentation Report in the aircraft Maintenance Logbook that the Service Bulletin SB031 has been performed. Also report the workshop flight performed. If not present a dedicated logbook, use the final pages of the Maintenance Manual of the aircraft (Chapter Maintenance record). It is appreciated by I.C.P. Srl to receive via email (tecnico@icp.it) an image or scan of the logbook entry after the SB application. SERVICE BULLETIN - SB031 Doc. No.: SB031 Revision: 00 Rev. Date: 13/12/2023 Page: 14/14 FSB01 Left intentionally blank