Update: March 15, 2023
On March 15, 2023, the Federal Administration (FAA) issued AD 2023-05-16 that supersedes the previously released AD 2023-04-08. Effective upon publication, the new ruling document, AD 2023-05-16 includes additional engine models (IO-470-A, -C, -F, and -LO; and TSIO-360-F and -FB) and notes that the limitations in the special flight permit paragraph, specifying that “no metal contamination in the oil filter” did not account for trace metal particles that can be found in newer engines after engine break-in is performed.
To view the most recent AD 2023-05-16 that supersedes AD 2023-04-08 and takes precedence over MSB23-01, click here.
Released: February 23, 2023
The Federal Aviation Administration (FAA) issued an Airworthiness Directive (AD 2023-04-08) on February 23, 2023, related to the Mandatory Service Bulletin (MSB23-01). Please be aware that AD 2023-04-08 takes precedence over MSB23-01 making the AD the governing document and rule for this issue.
Continental recently identified a potential safety of flight issue for aircraft equipped with Continental 360, 470, 520, 550 series engines and replacement crankshaft assemblies. As the parts manufacturer, Continental reported this to the authorities and released an MSB on February 13, 2023. MSB23-01 preemptively advises that an inspection should be performed to confirm that the crankshaft counterweight retaining ring was properly installed in new and rebuilt engines assembled between June 1, 2021, and February 7, 2023. This advice also applies to replacement crankshaft assemblies manufactured between June 1, 2021, through February 7, 2023. To further clarify, the MSB stated that Continental engines with over 200 hours may continue normal flight operations; however, this is no longer valid after the release of the AD. The AD takes precedence over the MSB and now requires an inspection of all affected engines and crankshaft assemblies listed in the MSB.
This page provides answers to some of the most asked questions regarding the MSB23-01 for crankshaft assemblies. Should you have additional questions, please review the full MSB or contact the Continental MSB Support Team.
This information is subject to change. Always refer to the most recent AD and MSB.
Contact the MSB Support Team
Follow this link to review the full AD: https://www.federalregister.gov/documents/2023/03/15/2023-05339/airworthiness-directives-continental-aerospace-technologies-inc-reciprocating-engines
The FAA AD 2023-05-16 takes precedence over Continental’s MSB23-01 making the AD the governing document and rule for this issue. Please reference the MSB as needed.
The AD includes additional engine models have been added to the applicability.
The AD notes that in the special flight permit paragraph, specifying “no metal contamination in the oil filter”, did not account for trace metal particles that can be found in newer engines after the break-in process.
A Special Flight Permit is still required to position the aircraft for maintenance.
The FAA AD inspection requirements apply to all engines referenced in MSB23-01A regardless of the operating hours on the engine.
The FAA AD must be completed prior to the next flight and does not provide a flight time allowance that can be used to reposition the aircraft to a maintenance facility. A Special Flight Permit will need to be requested and issued provided that:
Refer to the AD for the complete requirements.
Follow this link to apply for the Special Flight Permit from the FAA https://awc.faa.gov/AWCExternalApplicant/Splash/Index
Your compliance is accounted for in paragraph (f) of the AD and you are not required to re-perform the required action. Record compliance accordingly.
Per section J., Credit for Previous Actions in the AD, an additional logbook entry is not needed if the actions were performed before the effective date of this AD using the Continental Mandatory Service Bulletin MSB23-01, dated February 13, 2023.
Continental has identified a potential safety of flight issue for aircraft equipped with Continental 360, 470, 520, 550 series engines and replacement crankshaft assemblies. Consequently, per MSB23-01, Continental recommends that an inspection should be performed to confirm that the crankshaft counterweight retaining ring was properly installed in new and rebuilt engines assembled between June 1, 2021, and February 7, 2023. This advice also applies to replacement crankshaft assemblies manufactured between June 1, 2021, through February 7, 2023.
This potential assembly error does not impact the popular avgas 200 and 240 engine models, Titan, or PRIME engines.
The complete list of engines and crankshafts used as service spares that are affected by this bulletin are identified by Serial Number in MSB23-01. Visit the Service Bulletins section of the website under Support.
The engine serial number is located on the engine data plate which is mounted to the 1-3-5 side of the engine. The crankshaft serial number is stamped in the perimeter of the propeller flange.
An inspection is not required on engines and crankshaft assemblies that are not listed in MSB23-01.
Yes, to comply with the AD, all engine serial numbers and crankshaft serial numbers listed in the MSB, regardless of operating hours, should be inspected.
If you had a maintenance event that resulted in a new crankshaft, check the MSB to see if your crankshaft serial number is affected.
Per the instructions of MSB23-01, you should immediately proceed with crankshaft counterweight inspection.
Per the AD, affected crankshaft assembly must be inspected before further flight after the effective date of the AD.
A special flight permit may be issued in accordance with 14 CFR 21.197 and 21.199 to permit a one-time, non-revenue ferry flight to operate the aircraft to a location where the maintenance actions can be performed, provided that:
Per the AD, an inspection of the crankshaft assembly should be performed immediately for all affected serial numbers regardless of operating hours.
This inspection can be completed in the field, so your local qualified aircraft mechanic can perform this inspection and the potential procedure to comply with the MSB.
A specially designed gage should be used to check the tolerance between the retaining ring ears. To request a complimentary inspection tool, you can phone our MSB Support Team at 1-251-441-4460 or email MSB23Support@continental.aero
If you are within a 5-hour flight range, you can contact Continental’s Factory Service Center, Continental Services, at CQF in Fairhope, Alabama, to schedule your inspection. To check on availability, call 1-251-990-5080 or email firstname.lastname@example.org
The actions required to comply with this service document are covered, up to the Eligible Allowance provided for reimbursement, as shown in the MSB.
Any affected engine or crankshaft assembly over 200 hours that per the AD now requires an inspection, will be covered in accordance with MSB23-01A Section V. Warranty.
To obtain the Compliance Form and start the warranty process, use this link: http://www.continental.aero/uploadedFiles/Content/Services/Continental-Services-Warranty-Claim.pdf
Per Continental’s standard maintenance practices, Continental will cover the oil filter inspection, one (1) quart of oil, and labor.
To submit a separate warranty for this oil filter inspection, use this link: http://www.continental.aero/uploadedFiles/Content/Services/Continental-Services-Warranty-Claim.pdf
Continental has conducted a root cause analysis and identified that this was not a machining error or design flaw. Continental identified that this was an isolated workmanship assembly error and is taking this quality escape seriously. As a part of our review process and continuous improvement initiatives, the Continental team is evaluating all aspects of our assembly process, from training procedures to tools and quality systems.
The FAA issued AD2023-05-16 on March 15, 2023. This AD supersedes AD2023-04-08 that was released on February 23, 2023, making AD2023-05-16 the governing document and rule for this issue.
Continental recommends following the guidelines set in Continental's Maintenance Manual, M-0. Contact Continental's Technical Support Team if you have specific preservation questions.
Dedicated Phone: +1.251.441.4460 Monday through Friday 6am - 4:30pm CST
Dedicated Email: MSB23support@continental.aero
Stay up to date with all service bulletins: http://continental.aero/support/service-bulletins.aspx