Service Bulletin No. SB24-01 | Aircraft Spruce
CESSNA 185 · Service Bulletins
Overview
This Service Bulletin No. SB24-01, issued in January 2025, addresses the inspection and replacement of ACS Products Company keyed ignition switches for various aircraft models, including the Reims-Cessna F172. The bulletin outlines the reasons for the inspection, compliance requirements, and detailed instructions for pilots and mechanics. It emphasizes the importance of ensuring the integrity of ignition switches to prevent unintended engine startups, which could pose serious safety risks. The document provides specific compliance timelines and recommendations for regular testing of the ignition switches to maintain safety standards.
- Immediate inspection of ACS keyed ignition switches is required at the next pre-flight run-up after receipt of this bulletin.
- All ACS keyed ignition switches should be tested every 100 hours or at annual inspections, whichever comes first.
- The service life of ACS keyed ignition switches is 1000 hours or 10 years; they must be replaced after this period.
- If a key can be removed from the ignition switch in any position other than 'OFF', the switch must be replaced immediately.
- Logbook entries must be made to document compliance with the inspection requirements.
Document
Source
Originally published by www.aircraftspruce.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type ·
- Service Bulletins
- Year ·
- 2025
- Pages ·
- 3
- File size ·
- 78 KB
- Publisher ·
- www.aircraftspruce.com
What is the Service Bulletin No. SB24-01 | Aircraft Spruce?
The Service Bulletin No. SB24-01 | Aircraft Spruce is a service bulletins for the CESSNA 185, dated 2025.
How many pages is the Service Bulletin No. SB24-01 | Aircraft Spruce?
The copy of the Service Bulletin No. SB24-01 | Aircraft Spruce on file runs 3 pages.
Where does the Service Bulletin No. SB24-01 | Aircraft Spruce come from?
This copy of the Service Bulletin No. SB24-01 | Aircraft Spruce was originally published by www.aircraftspruce.com and is hosted on Sprinkle as a free, searchable reference copy.
What year was the Service Bulletin No. SB24-01 | Aircraft Spruce published?
The Service Bulletin No. SB24-01 | Aircraft Spruce — the CESSNA 185 service bulletins on file — is dated 2025.
Most owners only have the POH. Here's the essential set for the CESSNA 185.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins on file
- Type Certificate (TCDS)
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In this document
Compliance Requirements
The bulletin mandates immediate compliance for all ACS keyed ignition switches at the next pre-flight run-up prior to the next flight after receipt of the bulletin. Additionally, it is recommended that these switches be tested every 100 hours or at annual inspections, whichever comes first. The service life of these switches is stated to be 1000 hours or 10 years, after which they should be replaced.
General Information
The bulletin warns that over time, keys and internal components of the ignition switches may wear, allowing the key to be removed in positions other than 'OFF'. This condition could lead to ungrounded magnetos and unintended engine startups, posing risks of injury or fatalities. Immediate replacement of the switch is necessary if this condition is discovered.
Detailed Instructions
Pilots and mechanics are instructed to assume that a magneto is ungrounded and to stay clear of the propeller arc. The procedure involves turning the ignition switch counterclockwise from 'START' to 'OFF' while attempting to remove the key. If the key can be removed in any position other than 'OFF', the switch must be replaced immediately.
Safety notes
- Assume that a magneto is in an ungrounded condition and stay out of the arc of the propeller.
- Ensure the ignition switch is in the full OFF position before removing the key to ground the magnetos.
Full document text
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