Aviation Maintenance Alerts Template
Cessna 208 Caravan · Supplemental Type Certificate
Overview
This document serves as a template for submitting Aviation Maintenance Alerts (AMA) related to the Cessna 208 and 208B aircraft. It is intended for use by maintenance technicians and industry members to report anomalies and safety issues encountered during inspections or daily operations. The FAA encourages the aviation community to share their experiences and findings to enhance overall safety. The document outlines specific parts that require close inspection, particularly the Upper and Lower Wing Strut Fittings, and provides guidelines for corrective actions and recommendations based on reported issues.
- Inspect Upper Wing Strut Fittings (P/N 2621008) for cracks and corrosion, especially for aircraft on floats.
- Eddy Current Inspections for typical use should be done at 10,000 hours and every 5,000 hours thereafter; for severe use, at 5,000 hours and every 3,600 hours thereafter.
- Cracks have been reported in Lower Wing Strut Fittings (P/N 2621009-1 and -2) and attachment bolts; these should also be inspected regularly.
- Cessna 208 aircraft with significant flight hours (e.g., 5,667 and 9,184) have reported issues that necessitate close monitoring.
- The FAA encourages the aviation community to report anomalies to improve safety and share corrective actions.
Document
Source
Originally published by www.faasafety.gov. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type
- Supplemental Type Certificate
- Year
- 2007
- Pages
- 14
- File size
- 870 KB
- Publisher
- www.faasafety.gov
Common. Rarer than 14% of the aircraft models we track.
Most owners only have the POH. Here's the essential set for the Cessna 208 Caravan.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins
- Type Certificate (TCDS)
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In this document
Describe Alert Subject
This section requires submitters to provide details about the aircraft, including the product category, manufacturer, model, year of manufacture, and total time in service. It specifically mentions the Cessna 208 and 208B models, with examples of reported issues such as cracked and fractured wing strut fittings.
Describe Safety Issue
The document highlights significant safety concerns regarding cracked Upper and Lower Wing Strut Fittings on Cessna 208 airplanes. It details specific part numbers that should be inspected for cracks and corrosion, and emphasizes the importance of adhering to inspection time limits, especially for aircraft operated on floats.
Describe Alert Corrective Action/Recommendation
Maintenance technicians are advised to conduct thorough inspections of the specified wing strut fittings and related components. The document outlines the recommended inspection intervals and corrective actions to address the identified issues, ensuring that technicians are aware of the necessary steps to maintain aircraft safety.
Safety notes
- Maintenance technicians must pay close attention to the inspection of Upper and Lower Wing Strut Fittings.
- Aircraft operated on floats require adherence to 'Severe Inspection Time Limits' for safety.
Full document text
FEDERAL AVIATION ADMINISTRATION Aviation Maintenance Alerts Template Hello Aviation Industry Members, The Federal Aviation Administration (FAA) received numerous requests from the Aviation Industry (Industry) to reinstate the Aviation Maintenance Alerts (AC-43-16) (AMA) to assist industry members when sharing information regarding any anomalies and safety issues found during aircraft maintenance or related to their in-flight experiences. This newly created Aviation Maintenance Alerts (AMA) Template is available for voluntary submission of information that you will provide as a non-formatted document to add new data regarding any anomalies, adverse risks, safety issues, or problems encountered while using, inspecting, or modifying the aircraft. The FAA will add this data to our historical Alerts files. Further, when populated and submitted, the data is included as individual Alerts to our FAA Safety Team (FAAST) site. The Site is located under the General Aviation section (see User Guide for additional information). The FAA Alerts Team will log and track the Alerts in the FAAST site’s historical files and is included in the Table of Contents (List). The List will be searchable by ‘Product Category’ ‘Manufacturer’, and ‘Model’ for the aircraft, power plants, rotors, or component part of the accessories. This information will assist the Industry in finding similar Alerts for products written by others. The FAA Alerts Team will update the site’s List on a regular basis (either monthly or quarterly depending on the information received), and include copies of the original Alerts, as well as the updated List. The Word template is very simplistic and easy-to-populate. The Industry will use the AMA Template to submit an Aviation Maintenance Alert that identifies anomalies and safety issues, [as well as experiences] found during daily usage or routine maintenance checks and inspections. Gathering this information will not only help the Industry to share their experiences, but will assist the entire Aviation Community to improve aeronautical product safety. If the Industry submitter resolves the issues and successfully creates a workable solution, the submitter is encouraged to describe the corrective actions in Section III of the Template; or, if the submitter has found an option to correct future issues of the same nature, please include your recommendation in Section III. These actions will provide important information to other members of the aviation industry to ensure the information is captured and provided to industry personnel. These records will not only describe possible issues and resolutions, but will encourage feedback from other members regarding their experiences on similar products. When an AMA is published, the corrective action may not be fully evaluated. As more knowledge is provided, the Alerts will be promptly updated to include all facts provided. This includes feedback from other Aviation personnel or government agencies who provide support to the Aviation Industry. When the Alert is received, the List is updated and published on a regularly established schedule. Please use this Voluntary Template to document any safety issues, possible alerts, comments, or suggestions you may find. Download the Template to your electronic communication device, fill in as much information as possible, save the Template on your device, and email your completed document to us at FAA; ATTN: AFS-600 at: 9-AVS-Mxalerts@faa.gov. Thank you. Aviation Maintenance Alerts Template 2 SECTION I: DESCRIBE ALERT SUBJECT PRODUCT CATEGORY MANUFACTURER MODEL YEAR OF MFG TOTAL TIME IN SERVICE AIRCRAFT Note: This is the Word Template which must be populated by the submitter There is a list of common manufacturers listed in the Instructions, should you require the preferred product title for the categories Enter the Model Number of your product If available, please list the manufactured year of the product If available, please enter the Total Time in Service for the Product AIRPLANES Cessna 208 208B 2007 2007 5667 ♦ 9184 ♦♦ HELICOPTER/ ROTORCRAFT BALLOONS UAS POWERED PARACHUTE, WEIGHT-SHIFT CONTROL AND ULTRA-LIGHT POWERPLANT PROPELLER APPLIANCES/ACCESSORIES ♦ Upper Wing Strut Fitting cracked ♦♦ Upper Wing Lift Strut Fitting fractured Aviation Maintenance Alerts Template 3 SECTION II: DESCRIBE SAFETY ISSUE Cracked Upper and Lower Wing Strut Fittings on Cessna 208 Airplanes The FAA recommends that maintenance technicians pay close attention when they inspect the Upper Wing Strut Fittings, part numbers 2621008-1, -2, -3, -201, -202, -203 (Note: -201, -202, -203 are spares); and Upper Wing Strut Lift Fittings, part number 2622246-1, -2, -7, -8, -15, -16, -201, -202 (Note: -201, -202 are spares). The Maintenance Technicians should inspect the fittings for cracks and corrosion. In addition, cracks have been found in the Lower Wing Strut Fittings, part numbers 2621009- 1 and -2; in Nuts on Attachment Bolts, MS17826-12 (Lower Wing Strut), and MS21042L5 (Upper Wing Strut). Therefore, it is important that other parts in the area are inspected per the maintenance manual. Note that any airplane operated on floats needs to use “Severe Inspection Time Limits”. Upper Wing Strut Fitting Fracture (P/N 2621008) Transport Canada informed the FAA of a Service Difficulty Report (SDR) that described where a right-hand Upper Wing Strut Fitting (Part Number 2621008-202) was found cracked during an inspection of a Cessna 208 airplane on June 25, 2012. The Cessna 208 had 5,667 flight hours. The airplane operated on Wipaire Floats using Supplemental Type Certificate (STC) SA1311GL that allows it to operate at heavier weight than the Cessna certified airplane in Type Certificate Data Sheet (TCDS) A37CE. As reference, see page four (4) of the Transport Canada’s Feedback for issue 4/2013. Textron Aviation Material and Process (M&P) lab report, dated July 26, 2012 regarding the cracked
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Upper Wing Strut Fitting, stated: “Presence of closely spaced fatigue striations indicated that the mode of cracking was by high-cycle fatigue.” The maintenance manual inspection requirements for typical airplane use are in “Typical Inspection Time Limits” where Eddy Current Inspections are to be performed “at the first 10,000 hours and every 5,000 hours thereafter.” For severe airplane use, the inspection requirements are in “Severe Inspection Time Limits” where Eddy Current Inspections are to be [performed “at the first 5,000 hours and every 3,600 hours thereafter”. The location of the Upper Wing Strut Fitting, P/N 2621008 is displayed in the Figure 1 photograph and in the Figure 4 schematic. The Lower Wing Strut Fitting, P/N 2621009-1 and -2, is shown schematically in Figure 5. Cracking has occurred in the lower fitting. The crack, shown in Figure 2 and Figure 3, was found during a scheduled inspection. Only about a quarter-inch of material remained where the crack ended. Figure 2 shows indentation damage caused by the spacer, part number 2621013-2, and Figure 3 shows dark rub marks, a slight twist, and a few white-colored linear scratches. The schematics in Figure 6 and 7 show where the maintenance mechanic should do the Eddy Current Inspection on the Upper and Lower Wing Strut Fittings. Upper Wing Lift Strut Fitting Fracture (P/N 2622246): During a normal inspection on March 2, 2013, the aft Upper Wing Lift Strut Fitting (Part Number 2622246-16) on a Cessna 208B was found fractured through the bolt hole that attaches the wing lift strut to the wing. The airplane had accumulated 9,184 flight hours. Textron Aviation M&P lab report dated July 15, 2013 determined that the “mode of the cracking was due to fatigue.” “The crack origin was located along the surface of the bore hole.” The Eddy Current inspection intervals for the 2622000 parts are at the first 20,000 hours and every 5,000 hours thereafter for standard bolt S3561-77 (typical usage), 4,400 hours thereafter for S3561-163 (severe usage), and 3,600 hours thereafter for S3561-164 (severe usage). Figures 8 and 9 display the broken fitting while still installed on the airplane and after the removal. Aviation Maintenance Alerts Template 4 SECTION III: DESCRIBE ALERT CORRECTIVE ACTION/ RECOMMENDATION NOTE: If a resolution or correction action is identified, please describe below. If not, mark this section to be determined (TBD). Thank you. The FAA recommends that Maintenance Technicians pay close attention when they inspect the Upper Wing Strut Fittings, part numbers 2621008-1, -2, -3, -201, -202, -203 (Please Note: -201, -202, -203 are spares); and the Upper Wing Strut Lift Fittings, part number 2622246-1, -2, -7, -8, -15, -16, -201, - 202 (Please Note: -201, -202 are spares). The Maintenance Technicians will inspect the fittings for cracks and corrosion. In addition, cracks have been found in the Lower Wing Strut Fittings, part numbers 2621009-1 and -2; and in nuts on attachment bolts, MS17826-12 (Lower Wing Strut) and MS21042L5 (Upper Wing Strut). The Maintenance Technicians will inspect other parts in the area pursuant to the Maintenance Manual. Any airplane operated on floats needs to use “Severe Inspection Time Limits”. Aviation Maintenance Alerts Template 5 SECTION IV: INCLUDE GRAPHICS, DRAWINGS, AND PICTURES Note: Please place graphics, drawings, and pictures on separate pages. Include a page break at the end of each item. See instructions for additional guidance. Table of Figures Figure 1 View looking Aft of the Upper Wing Strut attach location on a Cessna 208. Also shown is the bolt head of the S3461-77 Bolt MPI Upper Attach .................................................................................................................................................................................... 6 Figure 2 View of the forward surface of the fitting, showing indentation damage due to contact with the 2621013-2 spacer (see arrow) .. 7 Figure 3 View of the aft side of the fitting showing dark rub marks and slight twisting deformation (arrows). Cracking extended all the way through the lower ligament, and approximately 80 – 90% through the upper ligament ...................................................................... 8 Figure 4 The Schematic displays the location of the Upper Wing Strut Fitting, part number 2621008-202. The Schematic also shows the S3461-77 Bolt MPI UPR Attach, 2621013-2 Spacer UPR Attach, and the 2621000-22 Strut Assembly RH Wing .................................... 9 Figure 5 The Schematic displays the Lower Wing Strut Fitting (Detail A), part numbers 2621009-1 and -2. (Please Note: Photographs are unavailable for cracked fittings)........................................................................................................................................................ 10 Figure 6 The Schematic (View B) displays the Right Wing Strut Assembly with view looking up. (Left side of the Schematic (View C) is opposite view)........................................................................................................................................................................................ 11 Figure 7 The Schematic of Eddy Current inspections for the Lower Wing Strut Fitting, part numbers 2621009-1 and -2 are displayed in Detail B; the Upper Wing Strut Fitting, part numbers 2621008-1, -2, -3, -201, -202, and -203 are displayed in Detail C ......................... 12 Figure 8 The Photograph shows the fractured Upper Wing Lift Strut Fitting prior to removal. The inboard portion of the fitting was completely separated from the main body of the fitting........................................................................................................................... 13 Figure 9 References: There are two views of the fractured part. a) Looking at the aft side of the part and b) Looking at the forward side .............................................................................................................................................................................................................. 14 Aviation Maintenance Alerts Template 6 Figure 1 View looking Aft of the Upper Wing Strut attach location on a Cessna 208. Also shown is the bolt head of the S3461-77 Bolt MPI Upper Attach Aviation Maintenance Alerts Template 7 Figure 2 View of the forward surface of the fitting, showing indentation damage due to contact with the 2621013-2 spacer (see arrow) Aviation Maintenance Alerts Template 8 Figure 3 View of the aft side of the fitting showing dark rub marks and slight twisting deformation (arrows). Cracking extended all the way through the lower ligament, and approximately 80 – 90% through the upper ligament Aviation Maintenance Alerts Template 9 Figure 4 The Schematic displays the location of the Upper Wing Strut Fitting, part number 2621008-202. The Schematic also shows the S3461-77 Bolt MPI UPR Attach, 2621013-2 Spacer UPR Attach, and the 2621000-22 Strut Assembly RH Wing Aviation Maintenance Alerts Template 10 Figure 5 The Schematic displays the Lower Wing Strut Fitting (Detail A), part numbers 2621009-1 and -2. (Please Note: Photographs are unavailable for cracked fittings) Aviation Maintenance Alerts Template 11 Figure 6 The Schematic (View B) displays the Right Wing Strut Assembly with view looking up. (Left side of the Schematic (View C) is opposite view) Figure 7 The Schematic of Eddy Current inspections for the Lower Wing Strut Fitting, part numbers 2621009-1 and -2 are displayed in Detail B; the Upper Wing Strut Fitting, part numbers 2621008-1, -2, -3, -201, -202, and -203 are displayed in Detail C Figure 8 The Photograph shows the fractured Upper Wing Lift Strut Fitting prior to removal. The inboard portion of the fitting was completely separated from the main body of the fitting Note: Relative to Figure 1, this view is looking forward instead of aft Aviation Maintenance Alerts Template Note: The primer shown in Figure 8 was removed for examination. 14 Figure 9 References: There are two views of the fractured part. a) Looking at the aft side of the part and b) Looking at the forward side