Service Bulletin SB-10, Revision A
CESSNA 172S Skyhawk · Service Bulletins
Overview
This service bulletin addresses material defects found in some of the extruded material used in McFarlane Aviation's aileron hinge assembly, part number MC0523816-1. It provides inspection methods to identify defective materials and outlines corrective actions. The affected hinges are used in various Cessna aircraft models, including the Cessna 172. The bulletin mandates inspection of the hinges within a specified time frame and details the compliance requirements for aircraft operators. It is crucial for maintaining safety and airworthiness in the affected aircraft models.
- Affected part number: MC0523816-1
- Inspection required within 25 hours TIS or 6 months after February 7, 2020
- Immediate replacement required if defects are found
- Use a 10X magnifier for inspection of hinge tabs
- Credit available for inspected and replaced hinges
Document
Source
Originally published by media.mcfarlaneaviation.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Service Bulletins
- Year
- 2020
- Pages
- 7
- File size
- 322 KB
- Publisher
- media.mcfarlaneaviation.com
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In this document
Subject
The bulletin addresses defects in the McFarlane aileron hinge assembly, P/N: MC0523816-1, which is used in several Cessna aircraft models, including the Cessna 172. It provides methods for inspection and corrective actions.
Affected Aircraft
The service bulletin lists Cessna aircraft models eligible for the affected aileron hinge, including the Cessna 172, with specific serial number ranges provided for each model.
Compliance
Inspection of the affected aileron hinges is mandatory and must be completed within 25 hours of flight time or within 6 months after February 7, 2020, whichever comes first. If defects are found, immediate replacement is required.
Inspection Methods
Operators must review service records to determine if affected hinges are installed. The inspection process includes disassembly of the hinge, cleaning, and detailed visual inspection for cracks and delamination using a 10X magnifier.
Credit Information
McFarlane offers a credit of $50 for each inspected aileron and $40 for each replaced hinge from the affected lots. Documentation of compliance is required to receive credit.
Safety notes
- Inspection is mandatory to ensure safety and airworthiness.
- Defective hinges must be replaced before further flight.
Full document text
McFarlane Aviation, Inc. 696 East 1700 Road Baldwin City, KS 66006 (785) 594-2741 Fax: (785) 594-3922 www.mcfarlaneaviation.com 1-800-544-8594 sales@mcfarlaneaviation.com Service Bulletin SB-10, Revision A February 10, 2020 Procedures specified in this service bulletin must be accomplished in accordance with accepted methods of aircraft maintenance and applicable government regulations. Appropriate log book entries must be made. COPYRIGHT © 2020 Page 1 of 7 I. SUBJECT This service bulletin addresses material defects found in some of the extruded material used in McFarlane Aviation, Inc (McFarlane). aileron hinge assembly, P/N: MC0523816-1. An inspection method to identify the defective material and the corrective actions are given in this document. The affected aileron hinge is used in Cessna aircraft models 150, 152, 170, 172, 175, 180, 182, 185, 205, and 210. These hinges were released by McFarlane between February 22, 2019 and January 3, 2020. II. BACKGROUND McFarlane PMA aileron hinge assembly, P/N: MC0523816-1 is used at three locations along each aileron control surface to attach it to the aircraft wing (see Figure 1 below). Figure 1 - Aileron Hinge Locations The McFarlane aileron hinge assembly is created from three subcomponents, two unique hinge halves and a hinge pin. During production the three components are matched-fit with pins of various diameters. This reduces the gap between components and thus increases the life of the hinge assembly. Due to this design attribute the subcomponents are not interchangeable. Page 2 of 7 Service Bulletin 10, Revision A Each hinge half is machined from extruded aluminum hinge stock. For the purpose of inspection, the hinge half features are defined as follows: Figure 2 - Hinge Design Features III. AFFECTED AIRCRAFT The McFarlane hinge, P/N: MC0523816-1, is eligible for installation on the following Aircraft: Table 1 – Eligible Cessna Aircraft Eligibility for Aileron Hinge, P/N: MC0523816-1 Series Model Beginning S/N Ending S/N Series Model Beginning S/N Ending S/N 150 150 17001 17999 175 175 55001 56238 150 150 59001 59018 175 175A 56239 56777 150 150A 15059019 15059350 175 175B 17556778 17557002 150 150B 15059351 15059700 175 175C 17557003 17557119 150 150C 15059701 15060087 180 180 30000 32661 150 150D 15060088 15060772 180 180A 32662 50355 150 150E 15060773 15061532 180 180B 50356 50661 150 150F 15061533 15064532 180 180C 50662 50911 150 150G 15064533 15067198 180 180D 18050912 18051063 150 150H 15067199 15069308 180 180E 18051064 18051183 150 150J 15069309 15071128 180 180F 18051184 18051312 150 150K 15071129 15072003 180 180G 18051313 18051445 150 150L 15072004 15075781 180 180H 18051446 18052284 150 150M 15075782 15079405 180 180J 18052285 18052770 150 A150K A1500001 A1500226 180 180K 18052771 18053203 150 A150L A1500227 A1500523 182 182 33000 33842 150 A150M A1500524 A1500734 182 182A 33843 51556 150 F150F F1500001 F1500067 182 182B 51557 52358 150 F150G F1500068 F1500219 182 182C 52359 53007 150 F150H F1500220 F1500389 182 182D 18253008 18253598 150 F150J F1500390 F1500529 182 182E 18253599 18254423 Page 3 of 7 Service Bulletin 10, Revision A Table 1 – Eligible Cessna Aircraft Eligibility for Aileron Hinge, P/N: MC0523816-1 (Continued) Series Model Beginning S/N Ending S/N Series Model Beginning S/N Ending S/N 150 F150K F15000530 F15000658 182 182F 18254424 18255058 150 F150L F15000659 F15001143 182 182G 18255059 18255844 150 F150M F15001144 F15001428 182 182H 18255845 18256684 150 FA150K FA1500001 FA1500081 182 182J 18256685 18257625 150 FA150L FA1500082 FA1500120 182 182K 18257626 18258505 150 FRA150L FRA1500121 FRA1500261 182 182L 18258506 18259305 150 FRA150M FRA1500262 FRA1500336 182 182M 18259306 18260055 152 152 15279406 15286033 182 182N 18260056 18260825 152 A152 A1520735 A1521049 182 182P 18260826 18265175 152 F152 F15201429 F15201980 182 182Q 18265176 18267715 152 FA152 FA1520337 FA1520425 182 182R 18267716 18268333 170 170 18000 18729 182 182R 18268384 18268615 170 170A 18730 20266 182 182S 18280001 18280944 170 170A 19200 20266 182 182T 18280945 182999999 170 170B 20267 20999 182 F182P F18200001 F18200025 170 170B 25000 27169 182 F182Q F18200026 F18200169 172 172 28000 46754 182 FR182 FR18200001 FR18200070 172 172A 46755 47746 182 R182 R18200001 R18202041 172 172B 17247747 17248734 182 T182 18267716 18268333 172 172C 17248735 17249544 182 T182 18268384 18268615 172 172D 17249545 17250572 182 T182T T18208001 T182999999 172 172E 17250573 17251822 182 TR182 R18200584 R18202041 172 172F (T-41A) 17251823 17253392 185 185 1850001 1850237 172 172G 17253393 17254892 185 185A 1850238 1850512 172 172H (T-41A) 17254893 17256512 185 185B 1850513 1850653 172 172I 17256513 17257161 185 185C 1850654 1850776 172 172K 17257162 17259223 185 185D 1850777 1850967 172 172L 17259224 17260758 185 185E 1850968 1851149 172 172M 17260759 17267584 185 A185E 18501600 18502090 172 172N 17267585 17274009 185 A185E 1850968 1851599 172 172P 17274010 17276673 185 A185F 18502091 18504448 172 172Q 17275869 17276516 205 210-5 (205) 2050001 2050480 172 172R 17280001 17299999 205 210-5A (205A) 2050481 2050577 172 172RG 172RG0001 172RG1191 210 210 57001 57575 172 172S 172S8001 172S99999 210 210A 21057576 21057840 172 F172D F1720001 F1720018 210 210B 21057841 21058085 172 F172E F1720019 F1720085 210 210C 21058086 21058220 Page 4 of 7 Service Bulletin 10, Revision A Table 1 – Eligible Cessna Aircraft Eligibility for Aileron Hinge, P/N: MC0523816-1 (Continued) Series Model Beginning S/N Ending S/N Series Model Beginning S/N Ending S/N 172 F172F F1720086 F1720179 210 210D 21058221 21058510 172 F172G F1720180 F1720319 210 210E 21058511 21058715 172 F172H F17200655 F17200754 210 210F 21058716 21058818 172 F172H F1720320 F1720431 210 210G 21058819 21058936 172 F172H F1720432 F1720435 210 210H 21058937 21059061 172 F172H F1720436 F1720442 210 210J 21059062 21059199 172 F172H F1720443 F1720443 210 210K 21059200 21059502
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172 F172H F1720444 F1720446 210 210L 21059503 21061573 172 F172H F1720447 F1720654 210 210M 21061574 21062954 172 F172K F17200755 F17200804 210 210N 21062955 21064135 172 F172L F17200805 F17200904 210 210N 21064136 21064897 172 F172M F17200905 F17201514 210 210R 21064898 21065009 172 F172N F17201515 F17202039 210 P210N P21000001 P21000834 172 F172P F17202040 F17202254 210 P210R P21000835 P21000874 172 FP172 FP1720001 FP1720003 210 T210F T2100001 T2100197 172 FR172E FR17200001 FR17200060 210 T210G T2100198 T2100307 172 FR172F FR17200061 FR17200145 210 T210H T2100308 T2100392 172 FR172G FR17200146 FR17200225 210 T210J T2100393 T2100454 172 FR172H FR17200226 FR17200350 210 T210K 21059200 21059502 172 FR172J FR17200351 FR17200559 210 T210L 21059503 21061573 172 FR172J FR17200562 FR17200590 210 T210M 21061574 21062954 172 FR172K FR17200591 FR17200675 210 T210N 21062955 21064135 172 P172D P17257120 P17257188 210 T210N 21064136 21064897 172 R172K R1722000 R1723454 210 T210R 21064898 21065009 Page 5 of 7 Service Bulletin 10, Revision A IV. AFFECTED PARTS Affected McFarlane aileron hinges are P/N: MC0523816-1, shipped between February 22, 2019 and January 3, 2020. The production lots for these parts are JO55493, JO55519, JO56823, JO57775, & JO60003. V. IDENTIFICATION METHODS Aircraft service records for aircraft listed in Section III of this document must be reviewed to determine if a McFarlane aileron hinge from the affected part list has been installed. If the affected aileron hinges have been installed, the hinges must be inspected per section VII instructions. If aircraft service records show the aileron hinges have not been installed or purchased between the dates of February 22, 2019 and January 3, 2020, or were replaced with non-McFarlane parts, this service bulletin is not applicable. This service bulletin is applicable to all hinges purchased between February 22, 2019 and January 3, 2020. Figure 3 - Example Laser Etched Hinge Marking Note: In an unpainted state, McFarlane aileron hinges are anodized and appear gold in color. Further, the aileron hinge marking most likely appears on the riveted half of the hinge and will be obscured when installed. In most cases, the aircraft service records will be needed to determine if an affected aileron hinge has been previously installed. This service bulletin must be considered applicable to any hinges purchased between February 22, 2019 and January 3, 2020 and not installed. VI. COMPLIANCE Disassembly and inspection of the McFarlane aileron hinge is mandatory and must be completed within the next 25 hours time-in-service (TIS) after February 7, 2020 or within the next 6 months after February 7, 2020, whichever comes first if the aileron hinge is one of the lots listed in section IV of this service bulletin. If the inspection identifies extrusion cracks or delamination of the hinge bulb, immediate replacement of the hinge is required prior to further flight. The requirements of Section VII are one time only. There are no recurring requirements. Uninstalled aileron hinges from the affected lots must be returned to McFarlane. VII. ACCOMPLISHMENT INSTRUCTIONS A. Disassembly 1. The hinge halves must be separated for proper inspection. 2. Remove the three attachment screws that lock the hinge pins into place. 3. Remove the hinge pins. Be sure not to mix the aileron hinge pins as they are select fit for each hinge. 4. Carefully support the aileron for inspection. 5. Inspect the affected hinges per Section VII B. B. Inspection 1. Ensure that you can view each end of each of the aileron hinge tabs. This may require removal of paint from around each tab area to ensure full visibility. Page 6 of 7 Service Bulletin 10, Revision A 2. Clean the hinge tab with appropriate solvent or detergent to expose the ends and body of the tab. All end surfaces must be clean and clear for inspection. 3. Using 10X magnifier, carefully inspect the ends of each hinge tab of each hinge half (surface and wing hinge half), for internal cracks and/or delamination in the bulb around the pin bore. Cracks and delamination defects appear as small lines that can extend from the pin bore to the outside surface of the tab or lines traveling around the pin bore. Refer to Figure 4 for examples of known defects. Figure 4 – Known Internal Cracking and Delamination Defects 4. Inspect the visible hinge flat surface with a 10X magnifier. Inspect the flat side of each hinge tab for external cracks that extend the length of the hinge tab. Refer to Figure 5 for examples of possible defects. Figure 5 – Known External Cracking Defect 5. If any cracks or defects are detected in either hinge half, remove and replace the hinge assembly per the instructions of aircraft service manual. C. Reassembly and Return to Service 1. Reinstall the ailerons in the opposite manner as they were removed. 2. Using the service manual complete all required checks to return the aircraft to service 3. Make appropriate aircraft maintenance record entry for compliance with this service bulletin VIII. MATERIAL PRICE AND AVAILABILITY Part number MC0523816-1 aileron hinges are available from McFarlane Page 7 of 7 Service Bulletin 10, Revision A IX. CREDIT INFORMATION McFarlane will issue a credit of $50.00 per aileron inspected from the affected lots (see Section IV). In addition, McFarlane will issue a credit of $40.00 per aileron hinge replaced from the affected lots. Part Credit and a ground freight allowance will be provided upon return of any defective parts. To receive credit for compliance with this service bulletin the aircraft N-number, model, and serial number along with a copy of the aircraft maintenance record entry showing compliance with this service bulletin will need to be provided. X. DISTRIBUTION This service bulletin has been distributed to all customers for whom McFarlane has sales records indicating the purchase of affected parts. All McFarlane service bulletins may also be found at www.mcfarlaneaviation.com. Please forward this urgent information to the current owner or operator of the affected aircraft. For further information or questions call (800) 544-8594 or (785) 594-2741. All persons are free to copy this bulletin if it is copied in its entirety with no alterations or additions.