Service Bulletin No. SB24-01 | Aircraft Spruce

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Service Bulletin No. SB24-01 January 2025 SUBJECT: ACS Products Company Keyed Ignition Switches Inspection & Replacement. REASON FOR BULLETIN: To provide inspection procedures and continued switch integrity and replacement. EQUIPMENT AFFECTED: All ACS (and Gerdes) keyed ignition switches including but not limited to A-510-2, and planes as listed below in Appendix A: COMPLIANCE: 1. IMMEDIATE – At the next pre-flight run up PRIOR TO THE NEXT FLIGHT after receipt of this Service Bulletin for all ACS keyed ignition switches. 2. Additionally, it is recommended that all ACS keyed ignition switches be tested as advised in this Service Bulletin every 100 hours or at annual, whichever comes first. 3. Service life of all ACS (and Gerdes) keyed ignition switches is 1000 hours or 10 years, after which switches should be replaced. GENERAL INFORMATION: Over time keys and internal switch components may become worn such that it is possible to remove the key from the switch in a position other than the OFF position which could result in an ungrounded magneto, which could lead to unintended engine startup during hand movement of the propeller and possible injuries or fatalities if anyone is near or in the path of the propeller at the time. If this condition is discovered, immediate switch replacement is necessary. Until the switch can be replaced, ensure that the switch is in the full OFF position before removing the key to ensure that the magnetos are grounded. This test should be repeated for all existing and any newly purchased keys. DETAILED INSTRUCTIONS: Pilots and mechanics must always assume that a magneto is in an ungrounded condition and stay out of the arc of the propeller. With the master battery contactor switch off, slowly rotate the ignition switch counterclockwise from the “START” position to the “OFF” position while gently trying to pull the key out of the switch. If the key can be removed in ANY position other than “OFF” the switch should be replaced immediately. A logbook entry with inspection results should be made to show compliance with this immediate inspection requirement. Service Bulletin No. SB24-01 Appendix A: Make: Model: TCDS: Serial Number: Cessna 150, 150A-150H 3A19 15017001 thru 150J-150M 15079405 A150M A1500610 thru A1500734 152 15279406 and up A152 A1520735 and up Cessna 172D-172I 3A12 17249545 thru 172K-172N, 172P 17276516 172Q Cessna 177, 177A, 177B A13CE 1770000 and up Cessna 177RG A20CE 177RG0001and up Cessna 180H 5A6 18051446 thru 18052284 Cessna 182E-182H 3A13 18253599 thru 182J-182N, 182P 18267715 182Q Cessna 185, 185A-185E 3A24 185-0001 thru 1851149 Cessna U206C-U206G A4CE U206-0195 and up TU206C-TU206G P206C-P206E P206-0420 thru TP206C-TP206E P20600647 Cessna 207, 207A A16CE 20700001 and up T207, T207A 20700001 and up Cessna 210G, 210H 3A21 21058819 and up 210J-210N, 210R, T210G, T210H T210-0198 and up T210J-T210N, T210R Reims Aviation F150G, F150H A13EU F15001249 and up F150J-F150M FA150K, FA150L FA1500282 and up Reims Aviation F152 A13EU F15201429 and up FA152 FA1520037 and up Reims Aviation F172 A4EU F172-0019 and up Cessna 185, 185A-185E 3A24 185-0001 thru 1851149 Service Bulletin No. SB24-01 Make: Model: TCDS: Serial Number: Cessna U206C-U206G A4CE U206-0915 and up TU206C-TU206G P206C-P206E P206-0420 thru TP206C-TP206E P20600647 Cessna 207, 207A A16CE 20700001 and up T207, T207A 20700001 and up Cessna 210G, 210H 3A21 21058819 and up 210J-210N, 210R T210G, T210H T210-0198 and up T210J-T210N, T210R Reims Aviation F150G, F150H A13EU F15001249 and up F150J-F150M FA150K, FA150L FA1500282 and up F152 F15201429 and up FA152 FA1520337 and up Reims Aviation F172 A4EU F172-0019 and up