Service Bulletin SB-12
CESSNA 172C · Service Bulletins
Overview
This Service Bulletin SB-12, issued by McFarlane Aviation on December 12, 2023, addresses a critical safety issue concerning the outlet fitting of the MC0513120 series Fuel Selector Valves used in various Cessna aircraft, including the Cessna 172C. The bulletin highlights a potential failure condition that can occur if these valves are overhauled or reassembled with excessive torque applied to the outlet fitting. The bulletin mandates compliance for all affected valves, particularly those released before November 1, 2023, and outlines specific procedures for inspection, replacement, and documentation. It is essential for operators and maintenance personnel to follow the instructions to ensure safety and compliance with aviation regulations.
- Affected models include Cessna 170, 172, 175, and 177 series aircraft.
- Mandatory compliance for all MC0513120 series valves released before November 1, 2023.
- Torque specifications for the outlet fitting are 13-14 ft-lbs (156-168 in-lbs).
- Replacement of the outlet fitting and O-ring is required within 10 hours of operation or 3 months for valves with outlet port removal history.
- McFarlane will provide replacement parts free of charge to affected customers.
Document
Source
Originally published by www.mcfarlaneaviation.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Service Bulletins
- Year
- 2023
- Pages
- 5
- File size
- 297 KB
- Publisher
- www.mcfarlaneaviation.com
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In this document
Affected Aircraft
The service bulletin affects several models of Cessna aircraft, specifically the Cessna 172 series, including the 172, 172A, 172B, 172C, 172D, 172E, 172F (T-41A), 172G, 172H (T-41A), 172I, 172K, 172L, 172M, and various F and R series models. All serial numbers for these models are included, indicating a broad impact on the fleet.
Compliance Requirements
Compliance with this service bulletin is mandatory for all affected valves. For valves with no history of outlet port removal, replacement of the outlet fitting and O-ring is required before the next overhaul. For valves that have had the outlet port removed, replacement must occur within the next 10 hours of operation or 3 months, whichever comes first. Valves that have never been installed must be returned to McFarlane for exchange.
Repair Instructions
The bulletin provides detailed instructions for the removal and replacement of the outlet fitting. This includes safety precautions, the required torque specifications (13-14 ft-lbs), and the necessity to destroy the old fitting to prevent reuse. It also outlines the use of specific part numbers for the new outlet fitting and O-ring.
Material Availability
McFarlane will provide the necessary outlet fittings and O-rings free of charge to customers with affected valves. This includes specific part numbers and service kits required for compliance with the bulletin.
Credit Information
McFarlane offers a service credit for labor costs associated with compliance with this service bulletin. To receive credit, operators must provide documentation including the aircraft's N-number, maintenance record entries, and evidence of the old fitting's destruction.
Safety notes
- Ensure all safety precautions for an open fuel system are followed during repairs.
- Destroy the old outlet fitting to prevent future use.
Full document text
McFarlane Aviation, LLC. 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-12 December 12, 2023 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 © 2023 Page 1 of 5 I. SUBJECT This Mandatory Service Bulletin addresses a potential failure condition of the outlet fitting on McFarlane Aviation, LLC. (McFarlane) produced, MC0513120 series Fuel Selector Valves used in various Cessna 170, 172, 175, and 177 series aircraft. The failure condition presents itself on valves that have been overhauled, or otherwise reassembled, since the original assembly by McFarlane and have had excessive torque applied to the outlet fitting. II. BACKGROUND It was discovered by McFarlane that the outlet fitting on these fuel selector valves could potentially deform or crack when assembled multiple times. An investigation revealed this was due to an oversized O-ring used in the outlet port and high torque assembly requirements which led to excessive stress being placed on the outlet fitting. This risk only appears after removal and reinstallation of the same outlet fitting using the same high torque values (22-24 ft-lbs), such as during overhauls or other service operations on the valve itself. The investigation did not reveal any risk to valves that have only undergone their original assembly by McFarlane before installation. This service bulletin affects all MC0513120 series valves released before November 1, 2023. III. AFFECTED AIRCRAFT The aircraft affected by this service bulletin are as follows: Series Model Serial Number Range 170 170B 20286 thru 27169 172 172 All 172A All 172B All 172C All 172D All 172E All 172F (T-41A) All 172G All 172H (T-41A) All 172I All 172K All 172L All 172M 17260759 thru 17267584 F172D All F172E All F172F All F172G All F172H F172-0320 thru F172-0654 F172H F17200655 thru F17200754 F172K All F172L All F172M F17200905 thru F17201514 FP172 All FR172E All FR172F All FR172G All FR172H All Page 2 of 5 Service Bulletin 12 Series Model Serial Number Range 172 Cont. FR172J FR17200351 thru FR17200590 FR172K All P172D All R172E (T-41B, C, D) All R172F (T-41D) All R172G (T-41C, D) All R172H All R172K All 175 175 All 175A All 175B All 175C All 177 177 All 177A All 177B All IV. AFFECTED PARTS The parts affected by this service bulletin are as follows: Valve Part Number Lot Number Valve Part Number Lot Number MC0513120-5 53113 MC0513120-8 Cont. 60240 54463 61053 55862 62477 61199 64884 64142 65368 64937 65684 70108 65777 70997 65845 73499 65944 75810 66800 76524* 70106 MC0513120-6 53114 70224 58951 73258 62825 73283 66692 73665 67722 73934-1 69919 74934 70109 76804 70998 77992 73664 79352* 74381 MC0513120-9 53116 78080* 58858 MC0513120-8 53115 70999* 54412 MC0513120-200 53117 54464 58883 58746 62051 58840 70111 59750 71604* *Does not apply to lots 76524-1, 78080-1, 79352-1, 70999-1, or 71604-1 Page 3 of 5 Service Bulletin 12 V. IDENTIFICATION METHODS The affected Fuel Selector Valves include any released from McFarlane before November 1, 2023. Specific lot numbers of affected Valves are listed in Section IV. Lot numbers can be found on the body of the valve, opposite the outlet port, in the area shown in Figure 1 below. Lot numbers are either laser engraved on the body or printed on a polyester label. Aircraft with an affected Fuel Selector Valve must have the log book checked for any record of overhaul or service to the valve as this may affect the required service time as detailed in Section VI below. Figure 1: MC0513120 series valve showing part marking location. Arrow specifically points to location of lot number. VI. COMPLIANCE Compliance with this service bulletin is mandatory for all valves with lots listed in Section IV of this service bulletin. Required service times for these valves are dependent on the valve’s service history as listed below. Valves with no history of outlet port removal For valves that have only undergone their original assembly by McFarlane, replacement of the outlet fitting and O-ring is mandatory before, or during, the next required overhaul or service of the fuel selector valve. Valves with history of outlet port removal For valves that have a history of the outlet port being removed and reinstalled, such as during an overhaul or other service to the valve, replacement of the outlet fitting and O-ring is mandatory and must be completed within the next 10 hours time-in-service (TIS) or within the next 3 months, whichever comes first. Valves with no history of installation For any fuel selector valves with a lot number listed in Section IV that have never been installed on an aircraft, it is mandatory to return the valve to McFarlane for exchange before installation. VII. ACCOMPLISHMENT INSTRUCTIONS A. Repair Material Information All fuel valves will require one (1) new outlet fitting and one (1) new outlet O-ring. (See Figure 2). These components are part of the relevant McFarlane service kit. Page 4 of 5 Service Bulletin 12 Figure 2: MC0513120 series Fuel Selector Valve w/ Outlet Fitting and O-ring All repaired valves must use an MCM83248/2-906 O-ring for the outlet port. For the outlet fitting, use the table below to confirm the correct outlet fitting P/N for the repair of your Fuel Selector Valve: Valve P/N Outlet Fitting P/N Service Kit MC0513120-5 MC0513126 SB12-KT-1 MC0513120-6 MC0513126-1 SB12-KT-2 MC0513120-8 MC0513126-1 MC0513120-9 MC0513126-1 MC0513120-200 MC0513126-1 B. Outlet Fitting Removal and Replacement. Remove the fuel selector valve from the aircraft in the manner listed in your Cessna maintenance manual. (Outlet
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fitting may be replaced without valve removal if there is enough space in the aircraft. See Section C below) Replace the outlet fitting in the order described below: NOTE: Ensure all safety precautions for an open fuel system are followed until repair is complete and valve is reinstalled. 1. Remove all safety wire from the outlet fitting. 2. Remove the old fuel outlet fitting from the valve body and discard the old O-ring. 3. Destroy the old outlet fitting in a manner that prevents future use (EX: damaging the threads, drilling into the fitting body, etc.). NOTE: Record of destruction is required for compliance with this service bulletin. 4. Clean and inspect outlet threads on valve body for any gouges, scratches, burrs, or defects that could affect proper sealing. 5. Lubricate the new outlet O-ring (P/N: MCM83248/2-906) with aviation motor oil (SAE Standard J1899 or equivalent) 6. Slide new outlet O-ring around threaded end of the new fitting until making contact with the wrench flats. 7. Lubricate new outlet fitting threads with a thin coat of general purpose grease to prevent galling. 8. Thread new outlet fitting into the valve body and tighten until sealed (Torque fitting to 13-14 ft-lbs. or 156-168 in-lbs.) 9. Resecure drain plug to outlet fitting with .021”, or larger, safety wire. Page 5 of 5 Service Bulletin 12 C. Alternate Means of Compliance Compliance with this service bulletin may alternatively be accomplished through the following methods: 1. The outlet fitting replacement may be performed without removing the fuel selector valve from the aircraft, as long as there is enough room in the aircraft to correctly perform all steps listed in Section B above. In these instances, the outlet fuel line should be removed and the fuel shut off before beginning the replacement. 2. Any fuel selector valve affected by this service bulletin may be returned to McFarlane for service and fitting replacement. A record of this service from McFarlane must be kept with the aircraft log book and must show the date of service occurring after November 1, 2023. D. Return to Service 1. Reinstall fuel selector valve to the aircraft in the same manner it was removed. 2. Perform a functional leak check at all four valve positions: “RIGHT”, “LEFT”, “BOTH” and “OFF”. Inspect the fittings and fuel lines for any signs of leaking. Correct any leaks if discovered. 3. Make an entry in the aircraft log book that states compliance with this service bulletin. VIII. MATERIAL PRICE AND AVAILABILITY Outlet fittings MC051316 and MC051316-1, as well as O-Ring MCM83248/2-906, are available from McFarlane and will be provided free of charge to customers with affected valves. IX. CREDIT INFORMATION McFarlane will issue a replacement outlet fitting and new outlet O-ring at no cost to any customer with a fuel selector valve listed in Section IV. For aircraft with valves requiring repair within the next 10 hours time-in-service (TIS) or the next 3 months, a service credit will be allocated for labor costs for compliance with this service bulletin. (Please contact the McFarlane Sales department for the authorized credit amount for this service bulletin.) To receive credit for compliance, the following will need to be provided: • Aircraft N-number, model, and serial number • Copy of aircraft maintenance record entry showing compliance with this service bulletin, the lot number of the affected valve, and the date of service. • Either return of the old, original outlet fitting to McFarlane, OR sufficient evidence of its destruction, preventing reuse. • Total cost of the replacement; including labor hours, materials, and other related costs. For valves that are returned to McFarlane for service in compliance with this service bulletin, McFarlane will cover all related shipping, material, and McFarlane labor costs. 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.
What's in the CESSNA 172C TCDS
A Type Certificate Data Sheet (TCDS) is the FAA's record of what an aircraft type was approved as. It is the source of truth for weights, seating, fuel and the rules the design was certified against. Expand any line to see what it means.
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