# Cessna Service Bulletin F406-90: No revision named - Rights: © Textron Aviation Inc. Filed by the FAA in regulations.gov docket FAA-2021-0714, the docket of AD 2021-22-21. Not covered by OpenAirDocs’ CC0 dedication. - Document: [Cessna Service Bulletin F406-90](https://openairdocs.org/service-documents/cessna/f406-90.md) - Title as filed: SB F406-90 Rev 00 - Pages: 6 - PDF: https://openairdocs.org/files/sha256/b8/c2/b8c2c05b7f3d0cc8765e314cb4f0ceb61c3e1f0f4f243b42996274f11d9500fb - Page: https://openairdocs.org/service-documents/cessna/f406-90/file/b8c2c05b7f3d ## Text Some pages are OCR from a scan. OCR can misread letters and numbers. Each page's text from the PDF; open the PDF at a page with #page=N. ### Page 1 ASI AVIATION 51360 PRUNAY - FRANCE Service Bulletin N° F406-90 December 14th 2018 Page 1/6 MANUFACTURER REFERENCE: N°F406-90 N° ATA: 24 Date: 14th December 2018 TITLE: Replacement of switch circuit breaker P/N CM3589-20 by the P/N 406E2450-00000- 100. EFFECTIVITY Model Serial Number F406 001 & ON PURPOSE In service reports of development of smoke and a burning smell in the cockpit have been recorded. Technical investigations revealed that these occurrences were induced by the failure of a circuit breaker switch P/N CM3589-20. To address this issue, these circuit breaker switches must be imperatively replaced by the new circuit breaker switches reference P/N 406E2450-00000- 100 as described in this Service Bulletin, within the 200 hours of operation, or 12 months or the next programmed inspection, whichever occurs first. Non-compliance with this Service Bulletin may allow a de-ice propeller circuit breaker switch and/or a recognition light circuit breaker switch to fail in a manner that could result in noticeable smoke and a burning smell in the cockpit. A life limit of 6 years is introduced for this new breaker. The standard aircraft maintenance manual chapter 05-11-00 has been updated. COMPLIANCE: MANDATORY Shall be accomplished in the 200 hours of operation, or 12 months or the next programmed inspection. Circuit breaker switches CM3589-20 must be replaced by circuit breaker switches P/N 406E2450-00000-100. The circuit breaker switches P/N 406E2450-00000-100 must be replaced every 6 years. APPROBATION The technical content of this SB has been approved under EASA 21J.064. It is expected this Service Bulletin will be the subject of an EASA Airworthiness Directive. REFERENCE None SERVICE BULLETIN N° F406-90 ### Page 2 (OCR) ASI AVIATION ASI AVIATION 51360 PRUNAY - FRANCE MAN-HOURS Approximately 7 man-hours. MATERIAL Part Number Designation Quantity 406E2450-00000-100 Switch breaker 2* *if recognition light option is installed, quantity is 3 CREDIT Not applicable OVERVIEW LIGHT SCREW BRACKET LEFT DIMMING VERTICAL CONTROLS CIRCUIT PANEL BREAKER CIRCUIT BREAKER SWITCH CIRCUIT BRACKET 8800 BA99700000 BREAKER, DETAIL A SCREW. CIRCUIT FORWARD HORIZONTAL BREAKER CIRCUIT BREAKER AFT HORIZONTAL SIDE CONSOLE PANEL CIRCUIT BREAKER SWITCH CIRCUIT BREAKER PANEL Switch circuit breakers highlighted in red will be replaced. Service Bulletin N° F406-90 Page 2/6 December 14th 2018 ### Page 3 ASI AVIATION 51360 PRUNAY - FRANCE Service Bulletin N° F406-90 December 14th 2018 Page 3/6 ACCOMPLISHMENT INSTRUCTIONS WARNING: 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. PART 1: De-ice propeller circuit breaker switch Instruction VISA INSPECTION 1 Disconnect the Airplane battery. (Refer to the applicable sections of the F406 Maintenance manual). 2 Remove the pilot’s seat for access to remove the left circuit breaker console panel. (Refer to the applicable sections of the F406 Maintenance manual). 3 Remove the pilot’s circuit breaker console side panel to get access to the switches SCB24 and SCB25 (CM3589-20). (Refer to Maintenance Manual chapter 31-10-04). 4 Location of the breakers to be changed: forward horizontal C/B panel The two breakers to be changed are the following breakers: 5 Remove the switches SCB24 and SCB25 (P/N CM3589-20). ### Page 4 ASI AVIATION 51360 PRUNAY - FRANCE Service Bulletin N° F406-90 December 14th 2018 Page 4/6 6 Rework the panel P/N 6018110-4 as follow: 7 Re-identify the forward horizontal circuit breaker panel (P/N 6018110-4) as 406-5311-18110-004 with permanent marker. 8 Install the new switches P/N 406E2450-00000-100. 9 Install the pilot’s circuit breaker side panel. (Refer to the Maintenance Manual chapter 31-10-04). 10 If applicable (recognition light option installed) apply PART 2. 11 Install the pilot’s seat. (Refer to the applicable sections of the F406 Maintenance manual). 12 Reconnect the airplane battery and verify correct operation of any new switches installed. 13 Apply the test procedure described in Figure 101, MM Chapter 30-60-00. 14 Make an entry in the airplane logbook stating compliance and method of compliance with this Service Bulletin and when replacement of any avionics bus switch is due. ### Page 5 (OCR) ASI AVIATION ASI AVIATION 51360 PRUNAY - FRANCE PART 2: applicable only if recognition light option (5718714-14/20): 1 Location of the breakers to be changed: left forward vertical C/B panel LIGHT SCREW BRACKET LEFT DIMMING VERTICAL CONTROLS CIRCUIT SWITCH BREAKER CIRCUIT PANEL BREAKER BRACKET CIRCUIT BREAKER DETAIL A SCREW CIRCUIT FORWARD HORIZONTAL BREAKER CIRCUIT BREAKER PANEL AFT HORIZONTAL SIDE CONSOLE CIRCUIT BREAKER SWITCH CIRCUIT BREAKER PANEL 0000 The breaker to be changed is the following breaker: 888888÷100000 Service Bulletin N° F406-90 Page 5/6 December 14th 2018 ### Page 6 ASI AVIATION 51360 PRUNAY - FRANCE Service Bulletin N° F406-90 December 14th 2018 Page 6/6 2 Rework the panel P/N 6018110-4 as follow: 3 Re-identify the forward vertical circuit breaker panel (P/N 6018110-7) as 406- 5311-18110-007 with permanent marker. 4 Install the new switch P/N 406E2450-00000-100. 5 Install the pilot’s circuit breaker side panel. (Refer to the Maintenance Manual chapter 31-10-04). 6 Install the pilot’s seat. (Refer to the applicable sections of the F406 Maintenance manual). 7 Reconnect the airplane battery and verify correct operation of any new switches installed. 8 Apply the test procedure described in Figure 101, MM Chapter 30-60-00. 9 Make an entry in the airplane logbook stating compliance and method of compliance with this Service Bulletin and when replacement of any avionics bus switch is due. OWNER NOTIFICATION The Service Bulletin F406-90 dated 14th December 2018 will be addressed to the owners of the F406 airplanes. It is recommended to the customers to contact ASI AVIATION for any further information relating to the application of this Service Bulletin on your airplane. ASI AVIATION Aérodrome de Reims- Prunay 51360 Prunay France Tel: (+33) 3.26.48.46.65 Customer Support Website: http://asi-aviation.fr/asi-aviation-support/1.html Up --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain, except the copies of manufacturers’ service documents, which belong to their rights holders.