To give parts and instructions to replace the wing root canted rib upper cap with a new strengthened replacement cap.

Conquest SERVICE KIT TITLE CANTED RIB CAP MODIFICATION EFFECTIVITY MODEL SERIAL NUMBERS 441 441-0001 thru 441-0362 441 698 DESCRIPTION To give parts and instructions to replace the wing root canted rib upper cap with a new strengthened replacement cap. APPROVAL FAA approval has been obtained on technical data in this publication that affects airplane type design. This information shall be considered an amendment to the Cessna Manufacturer s Service/Maintenance Manual or Instructions for Continued Airworthiness, and must be accomplished for ongoing airworthiness compliance as required per 14 CFR Part 43.13. REFERENCE CQB03-1R1 CHANGE IN WEIGHT AND BALANCE SUBKIT... 1 2 WEIGHT INCREASE... 1.66 pound 1.66 pound ARM... 184.35 inch 184.35 inch RESULTANT MOMENT... 306.02 inch-pounds 306.02 inch-pounds MOMENT/1000... 0.306 inch-pounds 0.306 inch-pounds June 20, 2003 Original Issue: March 24, 2003 Page 1 of 21 To obtain satisfactory results, procedures specified in this publication must be accomplished in accordance with accepted methods and prevailing government regulations. Cessna Aircraft Company cannot be responsible for the quality of work performed in accomplishing the requirements of this publication. Cessna Aircraft Company, Product Support, P.O. Box 7706, Wichita, Kansas 67277, U.S.A. (316) 517-5800, Facsimile (316) 942-9006 COPYRIGHT 2003

MODIFICA- FORWARD LEFT AFT LEFT FORWARD RIGHT AFT RIGHT TION... WEIGHT 0.04 pound 0.24 pound 0.04 pound 0.24 pound INCREASE... ARM... 172.37 inches 197.50 inches 172.37 inches 197.50 inches RESULTANT 6.89 inch-pounds 47.40 inch-pounds 6.89 inch-pounds 47.40 inch-pounds MOMENT... MOMENT/1000 0.007 inch-pounds 0.047 inch-pounds 0.007 inch-pounds 0.047 inch-pounds MATERIAL INFORMATION NOTE: Order the following kit to repair the left side canted rib cap. NEW P/N QUANTITY KEY WORD OLD P/N INSTRUCTIONS/ DISPOSITION 1 1 Kit, consisting of the following parts: HL18PB5-4 10 Pin, HI-LOK HL18PB5-5 14 Pin, HI-LOK HL18PB5-6 2 Pin, HI-LOK HL18PB6-3 8 Pin, HI-LOK HL18PB6-4 18 Pin, HI-LOK HL18PB6-5 16 Pin, HI-LOK HL18PB6-6 2 Pin, HI-LOK HL18PB6-7 2 Pin, HI-LOK HL18PB10-10 1 Pin, HI-LOK HL18PB10-14 1 Pin, HI-LOK HL70-5 26 Collar HL70-6 46 Collar MS20426AD5-3 6 Rivet MS20426AD5-4 3 Rivet MS20470AD4-4 36 Rivet MS20470AD4-6 6 Rivet MS20470AD5-3 32 Rivet MS20470AD5-5 7 Rivet 5790066-11 1 Replacement Cap (Left) 5722206-1 Discard 5790066-13 1 Doubler (Left) 5790066-7 1 Shim 1 Instructions Page 2 June 20, 2003

Order the following kit to repair the right side canted rib cap. NEW P/N QUANTITY KEY WORD OLD P/N INSTRUCTIONS/ DISPOSITION 2 1 Kit, consisting of the following parts: HL18PB5-4 10 Pin, HI-LOK HL18PB5-5 14 Pin, HI-LOK HL18PB5-6 2 Pin, HI-LOK HL18PB6-3 8 Pin, HI-LOK HL18PB6-4 18 Pin, HI-LOK HL18PB6-5 16 Pin, HI-LOK HL18PB6-6 2 Pin, HI-LOK HL18PB6-7 2 Pin, HI-LOK HL18PB10-10 1 Pin, HI-LOK HL18PB10-14 1 Pin, HI-LOK HL70-5 26 Collar HL70-6 46 Collar HL75-10AW 2 Collar MS20426AD5-3 6 Rivet MS20426AD5-4 3 Rivet MS20470AD4-4 36 Rivet MS20470AD4-6 6 Rivet MS20470AD5-3 32 Rivet MS20470AD5-5 7 Rivet 5790066-10 1 Replacement Cap (Right) 5722206-2 Discard 5790066-12 1 Doubler (Right) 5790066-7 1 Shim 1 Instructions June 20, 2003 Page 3

The parts below may be necessary for the canted rib cap modification. NEW P/N QUANTITY DESCRIPTION OLD P/N DISPOSITION HL18PB6-4 As necessary Pin HL18PB6-5 As necessary Pin HL62PB6-3 As necessary Pin HL62PB6-4 As necessary Pin HL62PB6-5 As necessary Pin HL62PB6-6 As necessary Pin HL62PB6-7 As necessary Pin HL70-5 As necessary Collar HL75-6AW As necessary Collar (self-aligning) HL79-6 As necessary Collar Order the following parts as necessary for the closeout angle modifications. NEW P/N QUANTITY DESCRIPTION OLD P/N DISPOSITION HL18PB5-5 As required Pin HL70-5 As required Collar MS20470AD4-3 As required Rivet MS20470AD4-4 As required Rivet MS20470AD4-5 As required Rivet MS20470AD4-6 As required Rivet MS20470AD5-3 As required Rivet MS20470AD5-4 As required Rivet 5790066-16 1 Closeout Angle (Right, 5720001-6 Discard Forward) 5790066-17 1 Closeout Angle (Left, 5720001-5 Discard Forward) 5790066-18 1 Closeout Angle (Right, Aft) 5720001-4 or Discard 5720001-16 5790066-19 1 Closeout Angle (Left, Aft) 5720001-3 or Discard 5720001-17 5790066-20 1 Angle Doubler (Right) None Discard 5790066-21 1 Angle Doubler (Left) None Discard Page 4 June 20, 2003

The following material, or equivalent, is necessary. NAME NUMBER MANUFACTURER USE Sealant (Semkit, 6 oz.) CMNP021CLASSB2 Cessna Aircraft Company Cessna Parts Distribution 5800 East Pawnee PO Box 1521 Wichita, KS 67218 Touch-N-Prep Alodine 1132 Parker Amchem 32100 Stephenson Highway Madison Heights, Michigan 48071 Corrosion Resistant Primer 513 x 419910 x 942 PRC-DeSoto International 5430 San Fernando Road Glendale, CA 91209 To fay seal replacement rib cap parts. Fastener installation. To apply to bare metal. To apply to bare metal. ACCOMPLISHMENT INSTRUCTIONS 1. Electrically ground the airplane and turn all switches to the "OFF" position. If external power is connected to the airplane, disconnect external power from receptacle. 2. Disconnect the airplane battery. (Refer to the Maintenance Manual, Chapter 24, Electrical Power.) 3. Attach maintenance warning tags to the battery and external power receptacle with the following instruction: DO NOT CONNECT ELECTRICAL POWER - MAINTENANCE IN PROGRESS. 4. Support the airplane for major repairs to the wing center section structure. 5. Jack the airplane and support the wings and fuselage with maintenance cradles and jacks. Relieve weight on the wing to fuselage joint as much as possible. 6. Remove interior furnishings, floorboards and insulation as necessary. (Refer to applicable sections of the Maintenance Manual.) 7. Remove the fuselage to wing fairing. (Refer to the Maintenance Manual, Chapter 53, Fuselage to Wing Fairings - Maintenance Practices.) 8. Remove the 5722420-1 (5722420-2 right) inboard leading edge. (Refer to the Maintenance Manual, Chapter 57, Auxiliary Structure - Maintenance Practices.) 9. Remove the 5722411-3 (5722411-4 right) leading edge assembly as necessary. (Refer to the Illustrated Parts Catalog, Wing Auxiliary Structure.) 10. (Refer to Figure 1, View D-D.) On the right side only, remove the 5722308-6 support brackets as necessary for access to the canted rib cap. 11. Drain the hydraulic system. (Refer to the Maintenance Manual, Chapter 29, General - Maintenance Practices.) 12. Remove the hydraulic lines from the bulkhead fittings as necessary. 13. Remove the fasteners from the 5722302 stringer at FS 190.00. (Refer to the Maintenance Manual, Chapter 51, Fastener Installation and Removal.) June 20, 2003 Page 5

14. (Refer to Figure 1, View A-A, View B-B and Table 1.) Replace the canted rib cap. NOTE: Use longer or shorter fasteners as necessary throughout this step. NOTE: Do the steps that follow as necessary in conjunction with the closeout angle replacement in Step 15. Closeout angle replacement is only necessary if cracks are found as described in Step 15A. A. Remove the canted rib cap. (1) Make amark on the canted rib cap at approximately FS 186.75, an equal distance between fastener locations, and so that there is a minimum edge distance of 1.5 times the hole diameter. (2) Remove the fasteners from the canted rib cap and the 5822200-3 (left) (5822200-4 right) stiffener. (Refer to the Maintenance Manual, Chapter 51, Fastener Installation and Removal.) CAUTION: DO NOT CUT INTO THE CANTED RIB WEB OR UPPER WING SKIN. USE A STAINLESS STEEL GUARD TO AVOID DAMAGE. (3) Cut the canted rib cap into two pieces at the mark made. (4) Remove the canted rib cap and 5822200-3 (left) (5822200-4 right) stiffener from the canted rib web with non-metallic wedges and a heat gun. (a) Keep the 5822200-3 (left) (5822200-4 right) stiffener. (b) Keep the canted rib cap to use as a template to make the new rib cap piece. B. Prepare the replacement cap for installation. (1) Cut the 5790066-11 (5790066-10 right) replacement cap length to match the canted rib cap pieces that were removed in Step 14A(4). NOTE: It may be necessary to trim rib cap pieces to fit in position. It may also be necessary to trim the rib cap flanges after holes are drilled in Step 14E(3) and Step 14F(3). NOTE: The piece of the 5790066-11 (5790066-10 right) replacement cap cut to match the forward section of the canted rib cap will be called the forward rib cap. The other piece will be called the aft rib cap. C. (Refer to Figure 1, View E-E.) Do an inspection of the fastener holes shown. If there are only two fastener holes in the area, go to Step 14D. NOTE: This step must be done before the new canted rib cap is installed. Do not use holes plugged in this step to install the new canted rib cap with fasteners. (1) If the distance between the upper fastener hole and the lower fastener hole is at least three times the hole diameter and the lower hole is at least 1.5 times the hole diameter from the future position of the rib cap flange edge, go to Step 14D. The upper and lower holes can be used for fasteners that attach the new rib cap. (2) If the distance between the upper fastener hole and the lower fastener hole is not at least three times the hole diameter and the lower hole is at least 1.5 times the hole diameter from the future position of the rib cap flange edge, install a plug rivet in the upper hole through the canted rib web, the fuselage skin and the frame: NOTE: The lower hole can be used for afastener that attaches the new rib cap. (a) Determine the size of the hole that will be plugged. (b) Install an NAS1097B4 rivet or NAS1097B5 rivet as necessary in the canted rib web, fuselage skin and the frame. 1 Install each rivet with the countersunk head on the outside of the the canted rib web. 2 Install rivets wet with CMNP021CLASSB2 sealant. (Refer to the Maintenance Manual, Chapter 20 Fuel, Weather Pressure and High-Temperature Sealing - Maintenance Practices.) Page 6 June 20, 2003

(3) If the distance between the upper fastener hole and the lower fastener hole is not at least three times the hole diameter and the lower hole is less than 1.5 times the hole diameter from the future position of the rib cap flange edge, install a plug rivet in the lower hole through the canted rib web, the fuselage skin and the frame: NOTE: The upper hole can be used for afastener that attaches the new rib cap. (a) (b) Determine the size of the hole that will be plugged. Install an NAS1097B4 rivet or NAS1097B5 rivet as necessary in the canted rib web, the fuselage skin and the frame. 1 Install each rivet with the countersunk head on the outside of the canted rib web. 2 Install rivets wet with CMNP021CLASSB2 sealant. (Refer to the Maintenance Manual, Chapter 20 Fuel, Weather Pressure and High-Temperature Sealing - Maintenance Practices.) D. Trim the 5790066-13 (5790066-12 right) doubler as necessary. Make sure to keep a minimum edge distance of 1.5 times the hole diameter from the nearest fastener center to the ends of the 5790066-13 (5790066-12 right) doubler. NOTE: It may be necessary to trim the doubler ends for correct edge distance. It may also be necessary to trim the doubler after holes are reamed in Step 14L. E. Temporarily install the forward rib cap with the 5822200-3 (5822200-4 right) stiffener. (1) Mark the fastener holes. (2) Remove the forward rib cap with the 5822200-3 (5822200-4 right) stiffener and drill HI-LOK pin holes with a Number 22 drill bit. (3) Drill six 0.1625-0.1645 inch diameter holes, 36 0.1885-0.1905 inch diameter holes, 23 Number 21 (0.159 inch diameter) holes and 22 Number 30 (0.128 inch diameter) holes to match the canted rib web, the 5822200-3 (5822200-4 right) stiffener and the center wing skin. (4) Trim the forward rib cap as necessary for correct fit. (5) Install the kept stiffener to the forward rib cap with 15 MS20470AD5-3 rivets. (6) Attach the forward rib cap and the 5822200-3 (5822200-4 right) stiffener to the canted rib web, the rib assembly and the center wing skin with temporary sheet metal fasteners. F. Temporarily install the aft rib cap. (1) Mark the fastener holes. (2) Remove the aft rib cap and drill HI-LOK pin holes with a Number 22 drill bit. (3) Drill 18 0.1625-0.1645 inch diameter holes, 11 0.1885-0.1905 inch diameter holes, 12 Number 21 (0.159 inch diameter) holes and 20 Number 30 (0.128 inch diameter) holes through the aft rib cap. (4) Trim the aft rib cap as necessary for correct fit. (5) Attach the aft rib cap to the canted rib web and the center wing skin with temporary sheet metal fasteners. G. Attach the 5722302 stringer and the 5790066-7 shim with the thick end of the shim positioned on the inboard end of the stringer to the center wing skin with temporary sheet metal fasteners. H. Drill nine Number 21 (0.159 inch diameter) holes through the 5790066-7 shim to match the 5722302 stringer, the center wing skin, and the aft rib cap. I. Temporarily put the 5790066-13 (5790066-12 right) doubler on the forward rib cap and the aft rib cap and make marks for the hole locations to match the canted rib web. June 20, 2003 Page 7

J. Remove the 5790066-13 (5790066-12 right) doubler and drill the marked holes with a Number 22 drill bit. K. Install the doubler with temporary sheet metal fasteners. L. Ream the holes to 0.1605-0.1625 inch diameter through the 5790066-13 (5790066-12 right) doubler, the forward rib cap and the aft rib cap for HL18PB5 pins. M. Trim the doubler flanges as necessary for correct fit. NOTE: If necessary to make an interference fit of 0.0005 to 0.0015, ream the holes in the forward rib cap, aft rib cap and 5790066-13 (5790066-12 right) doubler to 0.1885-0.1905 inch diameter for HL18PB6 pins. Make sure there is a minimum edge distance of 1.5 times the hole diameter and a minimum of three times the hole diameter spacing. Deburr the holes. NOTE: For holes that require a 1/64 oversize HL62PB6 pin, ream holes to 0.2015-0.2035 inch diameter. Make sure there is a minimum edge distance of 1.5 times the hole diameter and a minimum of three times the hole diameter spacing. Deburr the holes. N. Remove the temporary sheet metal fasteners from the forward rib cap, the aft rib cap and the 5790066-13 (5790066-12 right) doubler. O. Trim the aft rib cap as necessary for correct fit. NOTE: If necessary to make an interference fit of 0.0005 to 0.0015, ream the holes in the forward rib cap, aft rib cap and 5790066-13 (5790066-12 right) doubler to 0.1885-0.1905 inch diameter for HL18PB6 pins. Make sure there is a minimum edge distance of 1.5 times the hole diameter and a minimum of three times the hole diameter spacing. Deburr the holes. NOTE: For holes that require a 1/64 oversize HL62PB6 pin, ream holes to 0.2015-0.2035 inch diameter. Make sure there is a minimum 1.5 times the hole diameter edge distance and a minimum of three times the hole diameter spacing. Deburr the holes. P. Apply color chemical film treatment and corrosion resistant primer to the bare metal edges of the 5790066-13 (5790066-12 right) doubler, the forward rib cap and the aft rib cap. Q. (Refer to Figure 1.) Install the aft rib cap, the forward rib cap and the 5790066-13 (5790066-12 right) doubler. (1) If there is a gap between the canted rib web and the aft rib cap or the forward rib cap, fabricate and install a shim made from 2024-T3 aluminum of applicable thickness. (2) Fay seal the aft rib cap, the forward rib cap and the 5790066-13 (5790066-12 right) doubler to the canted rib web with CMNP021CLASSB2 sealant. (Refer to the Maintenance Manual, Chapter 20, Fuel, Weather and High-Temperature Sealing - Maintenance Practices.) (3) (Refer to Figure 1, View A-A.) Attach the aft rib cap and the 5790066-13 (5790066-12 right) doubler to the canted rib web with 12 MS20470AD5-3 rivets, one HL18PB6-3 pin, eight HL18PB6-4 pins, and four HL18PB6-5 pins. Use HL70-6 collars with pins as shown. (Refer to the Maintenance Manual, Chapter 51, Fastener Installation and Removal.) (a) (b) (c) (d) Use HL75-6AW self-aligning collars as necessary. Use HL62PB6 (1/64 oversize) pins with HL79-6 collars as necessary for oversize hole locations. Make sure there is a minimum edge distance of 1.5 times the hole diameter, a minimum of three times the hole diameter spacing and an interference fit of 0.0005 to 0.0015. Install the pins and rivets wet with CMNP021CLASSB2 sealant. Brushcoat fastener heads with CMNP021CLASSB2 sealant. (4) (Refer to Figure 1, View B-B.) Attach the aft rib cap and the 5790066-13 (5790066-12 right) doubler to the center wing skin with 20 MS20470AD4-4 rivets, four HL18PB5-4 pins, ten Page 8 June 20, 2003

HL18PB5-5 pins, and two HL18PB5-6 pins. Use HL70-5 or HL70-6 collars with pins as shown. (Refer to the Maintenance Manual, Chapter 51, Fastener Installation and Removal.) (a) (b) (c) (d) (e) (f) Use HL75-6AW self-aligning collars as necessary. Use HL18PB6-4 and HL18PB6-5 pins with HL70-6 collars instead of HL18PB5-4 and HL18PB5-5 pins if necessary for an interference fit of 0.0005 to 0.0015. Make sure there is a minimum edge distance of 1.5 times the hole diameter and a minimum of three times the hole diameter spacing. Use HL62PB6 (1/64 oversize) pins with HL79-6 collars as necessary for oversize hole locations. Make sure there is a minimum edge distance of 1.5 times the hole diameter, a minimum of three times the hole diameter spacing and an interference fit of 0.0005 to 0.0015. (Refer to Figure 2, View B-B.) If installing 5790066-21 (5790066-20 (left) angle doubler, use two HL18PB5-5 pins and twenty MS20470AD4-5 rivets as shown to allow for thickness of doubler. Install the pins and rivets wet with CMNP021CLASSB2 sealant. Brushcoat fastener heads with CMNP021CLASSB2 sealant. (5) (Refer to Figure 1, View A-A.) Attach the forward rib cap, and the 5790066-13 (5790066-12 right) doubler to the canted rib web with 20 MS20470AD5-3 rivets, three MS20470AD5-5 rivets, eight HL18PB6-4, two HL18PB6-3 pins and four HL18PB6-5 pins. Use HL70-6 collars with pins as shown. (Refer to the Maintenance Manual, Chapter 51, Fastener Installation and Removal.) (a) (b) (c) (d) Use HL75-6AW self-aligning collars as necessary. Use HL62PB6 (1/64 oversize) pins with HL79-6 collars as necessary for oversize hole locations. Make sure there is a minimum edge distance of 1.5 times the hole diameter, a minimum of three times the hole diameter spacing and an interference fit of 0.0005 to 0.0015. Install the pins and rivets wet with CMNP021CLASSB2 sealant. Brushcoat fastener heads with CMNP021CLASSB2 sealant. (6) (Refer to Figure 1, View B-B.) Attach the horizontal flange of the forward rib cap common to the center wing skin with 16 MS20470AD4-4 rivets, six MS20470AD4-6 rivets, four MS20470AD5-5, six HL18PB5-4 pins, four HL18PB5-5 pins, two HL18PB6-4 pins, eight HL18PB6-5 pins, two HL18PB6-6 pins and two HL18PB6-7 pins. Use HL70-5 or HL70-6 collars with pins as shown. (Refer to the Maintenance Manual, Chapter 51, Fastener Installation and Removal.) (a) (b) (c) (d) (e) Use HL75-6AW self-aligning collars as necessary. Use HL18PB6-4 and HL18PB6-5 pins with HL70-6 collars instead of HL18PB5-4 and HL18PB5-5 pins if necessary for an interference fit of 0.0005 to 0.0015. Make sure there is a minimum 1.5 times the hole diameter edge distance and a minimum of three times the hole diameter spacing. Use HL62PB6 (1/64 oversize) pins with HL79-6 collars as necessary for oversize hole locations. Make sure there is a minimum 1.5 times the hole diameter edge distance, a minimum of three times the hole diameter spacing and an interference fit of 0.0005 to 0.0015. Install the pins and rivets wet with CMNP021CLASSB2 sealant. Brushcoat fastener heads with CMNP021CLASSB2 sealant. (7) (Refer to Figure 1, View A-A and View C-C.) Attach the horizontal flange of the 5822200-3 (5822200-4 right) stiffener to structure using five each HL18PB6-3 pins and HL70-6 collars, June 20, 2003 Page 9

one each HL18PB10-10 pin and HL75-10AW collar, and one each HL18PB10-14 pin and HL75-10AW collar. (a) Make sure there is a minimum 1.5 times the hole diameter edge distance, aminimum of three times the hole diameter spacing and an interference fit of 0.0005 to 0.0015. If you cannot get one or more of these, contact Cessna Propeller Aircraft Product Support at (316) 517-5800 or fax: (316) 942-9006, for further instructions. R. (Refer to Figure 1, View B-B.) Remove the temporary sheet metal fasteners from the 5790066-7 shim. S. Install the shim to the stringer and the center wing skin with six MS20426AD5-3 rivets and three MS20426AD5-4 rivets. (Refer to the Maintenance Manual, Chapter 51, Fastener Installation and Removal.) 15. Replace the forward and aft closeout angles if there are any cracks. NOTE: Use longer or shorter fasteners as necessary throughout this step. NOTE: Do the steps that follow as necessary in conjunction with the rib cap replacement in Step 14. A. (Refer to Figure 2, Views A-A and B-B.) Do a visual inspection of the 5720001 closeout angles for cracks: (1) If there are not any cracks, go to Step 16. (2) If there are any cracks, do Steps 15B, 15C or 15D as applicable. B. (Refer to Figure 2, Views A-A and B-B.) To replace the forward closeout angle only: (1) Remove fasteners from the forward closeout angle. CAUTION: DO NOT CUT INTO THE FUSELAGE SKIN. USE A STAINLESS STEEL GUARD TO AVOID DAMAGE. (2) Remove the forward closeout angle from the canted rib web with non-metallic wedges and a heat gun. (3) Put the 5790066-17 (forward, left) (5790066-16 forward, right) closeout angle to the structure and make marks for existing hole locations on the vertical flange only. (Mark and drill holes in the horizontal flange in conjunction with Step 14.) (4) Drill fourteen Number 21 (0.159 inch diameter) holes and 47 Number 30 (0.128 inch diameter) holes marked in the 5790066-17 (forward, left) (5790066-16 forward, right) closeout angle. (5) Fay seal the 5790066-17 (forward, left) (5790066-16 forward, right) closeout angle, and 5790066-21 (left) (5790066-20 right) angle doubler with CMNP021CLASSB2 sealant. (Refer to the Maintenance Manual, Chapter 20, Fuel, Weather and High-Temperature Sealing - Maintenance Practices.) (6) Attach vertical flange of closeout angle with same type fasteners as removed. (7) Brushcoat fastener heads with CMNP021CLASSB2 sealant. (8) Attach horizontal flange of the closeout angle in conjunction with rib cap replacement in Step 14. C. (Refer to Figure 2, Views A-A, B-B and Detail A.) To replace the aft closeout angle only: (1) Remove fasteners from the aft closeout angle. CAUTION: DO NOT CUT INTO THE FUSELAGE SKIN. USE A STAINLESS STEEL GUARD TO AVOID DAMAGE. (2) (Refer to Figure 2, Detail A.) Make amark on the aft closeout angle at the approximate locations shown an equal distance between fastener locations and so that there is a minimum of 1.5 times the hole diameter edge distance between the mark and the nearest fastener. (3) Cut the aft closeout angle at the mark made in the step above. Page 10 June 20, 2003

(4) Remove the forward section of the aft closeout angle from the canted rib web with non-metallic wedges and a heat gun. (5) Deburr sharp edges and apply color chemical film treatment and corrosion resistant primer to the bare metal edges. (6) Cut the 5790066-19 (aft, left) (5790066-18 aft, right) closeout angle as necessary to align with cuts made Steps 15C(3). (7) Deburr sharp edges and apply color chemical film treatment and corrosion resistant primer to the bare metal edges. (8) Put the 5790066-19 (aft, left) (5790066-18 aft, right) closeout angle to the structure and make marks for existing hole locations on the vertical flange only. (Mark and drill holes in the horizontal flange in conjunction with Step 14.) (9) Drill eight Number 21 (0.159 inch diameter) holes and 38 Number 30 (0.128 inch diameter) holes marked in the 5790066-19 (aft, left) (5790066-18 aft, right) closeout angle. (10) Attach the 5790066-19 (aft, left) (5790066-18 aft, right) closeout angle with temporary sheet metal fasteners. (11) Put the 5790066-21 (left) (5790066-20 right) angle doubler in position on the closeout angle so that the forward end is at approximately FS 192.70. Trim the doubler ends as necessary to have a minimum of 1.5 times the hole diameter edge distance. Make marks for cut lines and fastener locations. (12) Remove the 5790066-21 (left) (5790066-20 right) angle doubler. (13) Trim the 5790066-21 (left) (5790066-20 right) angle doubler as necessary. (14) Deburr sharp edges and apply color chemical film treatment and corrosion resistant primer to the bare metal edges. (15) Drill Number 30 (0.128 inch diameter) holes marked in the 5790066-21 (left) (5790066-20 right) angle doubler. (16) Deburr sharp edges and apply color chemical film treatment and corrosion resistant primer to the bare metal edges. (17) Fay seal the 5790066-19 (aft, left) (5790066-18 aft, right), closeout angle and 5790066-21 (left) (5790066-20 right) angle doubler with CMNP021CLASSB2 sealant. (Refer to the Maintenance Manual, Chapter 20, Fuel, Weather and High-Temperature Sealing - Maintenance Practices.) (18) Brushcoat fastener heads with CMNP021CLASSB2 sealant. (19) Attach vertical flange of closeout angle and doubler with same type fasteners as removed, except through doubler, as shown. (20) Attach horizontal flange of the closeout angle and doubler in conjunction with rib cap replacement in Step 14. D. (Refer to Figure 2, Views A-A and B-B.) To replace both the forward and aft closeout angles: (1) Remove fasteners from the forward closeout angle. (2) Remove fasteners from the aft closeout angle. CAUTION: DO NOT CUT INTO THE FUSELAGE SKIN. USE A STAINLESS STEEL GUARD TO AVOID DAMAGE. (3) (Refer to Figure 2, Detail A.) Make amark on the aft closeout angle at the approximate locations shown an equal distance between fastener locations and so that there is a minimum of 1.5 times the hole diameter edge distance between the mark and the nearest fastener. (4) Cut the aft closeout angle at the mark made in the step above. June 20, 2003 Page 11

(5) Remove the forward closeout angle and the forward section of the aft closeout angles from the canted rib web with non-metallic wedges and a heat gun. (6) Deburr sharp edges and apply color chemical film treatment and corrosion resistant primer to the bare metal edges. (7) Cut the 5790066-19 (aft, left) (5790066-18 aft, right) closeout angle as necessary to align with cuts made Steps 15D(4). (8) Deburr sharp edges and apply color chemical film treatment and corrosion resistant primer to the bare metal edges. (9) Put the 5790066-19 (aft, left) (5790066-18 aft, right) and 5790066-17 (forward, left) (5790066-16 forward, right) closeout angles to the structure and make marks for existing hole locations on the vertical flanges only. (Mark and drill holes in the horizontal flange in conjunction with Step 14.) (10) Drill 14 Number 21 (0.159 inch diameter) holes and 85 Number 30 (0.128 inch diameter) holes marked in the 5790066-19 (aft, left) (5790066-18 aft, right) and 5790066-17 (forward, left) (5790066-16 forward, right) closeout angles. (11) Attach the 5790066-19 (aft, left) (5790066-18 aft, right) and 5790066-17 (forward, left) (5790066-16 forward, right) closeout angles with temporary sheet metal fasteners. (12) Put the 5790066-21 (left) (5790066-20 right) angle doubler in position on the closeout angle so that the forward end is at approximately FS 192.70. Trim the doubler ends as necessary to have a minimum of 1.5 times the hole diameter edge distance. Make marks for cut lines and fastener locations. (13) Remove the 5790066-21 (left) (5790066-20 right) angle doubler. (14) Trim the 5790066-21 (left) (5790066-20 right) angle doubler as necessary. (15) Deburr sharp edges and apply color chemical film treatment and corrosion resistant primer to the bare metal edges. (16) Drill eight Number 21 (0.159 inch diameter) holes marked in the 5790066-21 (left) (5790066-20 right) angle doubler. (17) Fay seal the 5790066-19 (aft, left) (5790066-18 aft, right), 5790066-17 (forward, left) (5790066-16 forward, right) closeout angle, and 5790066-21 (left) (5790066-20 right) angle doubler with CMNP021CLASSB2 sealant. (Refer to the Maintenance Manual, Chapter 20, Fuel, Weather and High-Temperature Sealing - Maintenance Practices.) (18) Attach vertical flanges of the closeout angles and doubler with same type fasteners as removed, except through doubler, as shown. (19) Brushcoat fastener heads with CMNP021CLASSB2 sealant. (20) Attach horizontal flange of closeout angles and angle doubler in conjunction with rib cap replacement in Step 14. 16. (Refer to Figure 1, View D-D.) Install the 5722308-6 support brackets with the same type fasteners as removed. 17. Install the hydraulic lines to the bulkhead fittings. 18. Install the 5722411-3 (5722411-4 right) leading edge assembly if removed using the same type fasteners as removed. (Refer to the Illustrated Parts Catalog, Wing Auxiliary Structure.) 19. Install the inboard leading edge with the attaching hardware that were kept. (Refer to the Maintenance Manual, Chapter 57, Auxiliary Structure - Maintenance Practices.) 20. Do Steps 4 through 19 again as necessary for the opposite side. 21. Install interior furnishings, floorboards and insulation. (Refer to applicable sections of the Maintenance Manual.) Page 12 June 20, 2003

22. Install the fuselage to wing fairings. (Refer to the Maintenance Manual, Chapter 53, Fuselage to Wing Fairings - Maintenance Practices.) 23. Install access panel 512CZ (left) (612CZ right) that were removed per CQB03-1R1. (Refer to the Maintenance Manual, Chapter 6, Access Plates and Panels Identification - Description and Operation.) 24. Service the hydraulic system. (Refer to the Maintenance Manual, Chapter 29, General - Maintenance Practices.) 25. Do a cabin pressurization check. (Refer to the Maintenance Manual, Chapter 21, Pressurization Control System - Adjustment/Test.) 26. Remove mainenance warning tags and connect the airplane battery. 27. Make an entry in the airplane logbook stating which service kit has been installed. NOTE: This information shall be considered an amendment to the Cessna Manufacturer s Service/Maintenance Manual or Instructions for continued airworthiness and must be accomplished for ongoing airworthiness compliance as required per 14 CFR Part (FAR) 43.13. Table 1. Hole Diameters for Figure 1. PART NUMBER MS20426AD4 MS20426AD5 MS20470AD4 MS20470AD5 HL18PB5 HL18PB6 HL62PB6 HOLE SIZE Number 30 (0.128 inch diameter) Number 21 (0.159 inch diameter) Number 30 (0.128 inch diameter) Number 21 (0.159 inch diameter) 0.1625-0.1645 inch diameter 0.1885-0.1905 inch diameter 0.2015-0.2035 inch diameter June 20, 2003 Page 13

Figure 1. Rib Cap Modification (Sheet 1) Page 14 June 20, 2003

Figure 1. Rib Cap Modification (Sheet 2) June 20, 2003 Page 15

Figure 1. Rib Cap Modification (Sheet 3) Page 16 June 20, 2003

Figure 1. Rib Cap Modification (Sheet 4) June 20, 2003 Page 17

Figure 1. Rib Cap Modification (Sheet 5) Page 18 June 20, 2003

Figure 1. Rib Cap Modification (Sheet 6) June 20, 2003 Page 19

Figure 2. Closeout Angle Modification (Sheet 1) Page 20 June 20, 2003

Figure 2. Closeout Angle Modification (Sheet 2) June 20, 2003 Page 21