C292501-0107 – Textron Aviation OEM Ignition Switch Assembly
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Overview Section
The Textron Aviation C292501-0107 is the certified Original Equipment Manufacturer (OEM) Ignition Switch Assembly designed for piston-powered aircraft manufactured by Cessna and Textron Aviation (e.g., Skyhawk, Skylane series). This assembly is a critical electro-mechanical component that controls the engine's ignition system, integrating the functions of battery master control, starter engagement, and primary magnetos selection within a single, multi-position, key-operated rotary switch. The switch body is a complex, multi-contact wafer assembly designed to safely handle the high current required to engage the starter solenoid and the low-voltage logic necessary to control the twin magnetos.
The C292501-0107 is engineered for high reliability, providing the standard five operating positions: OFF, R (Right Magneto), L (Left Magneto), BOTH (Both Magnetos), and START (Momentary). Its robust construction and certification ensure that the pilot maintains absolute, fail-safe control over the engine's operation and shutdown sequence, complying with all necessary airworthiness standards for engine starting and ignition control.
Key Features Section
Five-Position Rotary Control: Provides the standard operating sequence: OFF-R-L-BOTH-START, offering pilot flexibility and magneto check capability.
Key-Operated Security: Requires a physical key for operation, serving as both the power-control mechanism and a security measure against unauthorized aircraft use.
High-Current Starter Contact: Features robust internal contacts capable of handling the high transient current necessary to actuate the remote starter solenoid, ensuring reliable engine cranking.
Dual Magneto Control: Provides independent and simultaneous control over the Left (L) and Right (R) engine magnetos by grounding the respective P-leads.
Momentary START Position: The spring-loaded START position returns to the BOTH position upon release, protecting the starter motor from continuous engagement.
OEM Quality and Fit: Guarantees perfect fitment, function, and electrical compatibility with the original aircraft wiring harness and panel cutout.
Anti-Sputtering Contacts: Engineered contact materials and geometry minimize arc pitting and oxidation, providing a clean, reliable electrical break for engine shutdown (OFF).
Technical Specifications Section
Part Number: C292501-0107
Component Type: Key-Operated Rotary Ignition Switch Assembly
OEM Manufacturer: Textron Aviation (Cessna)
Function: Controls Magneto P-Leads and Starter Solenoid
Positions: 5 (OFF, R, L, BOTH, START (Momentary))
Voltage Rating: 14 VDC or 28 VDC (Designed for aircraft electrical systems)
Current Rating: High current capacity on the START terminal; low current capacity on the Magneto (P-lead) terminals.
Magneto Control: Ground-to-Kill (Magneto is ON when P-lead is open; OFF when P-lead is grounded).
Mounting: Panel Mount (Threaded shaft with keyed anti-rotation feature).
Governing Specifications: Certified under FAA-PMA/OEM standards for use in Textron Aviation aircraft.
Aircraft Compatibility Section
Cessna 100/200 Series: Cessna 172 Skyhawk, Cessna 182 Skylane, Cessna 206 Stationair (Specific applicability depends on the exact model year and serial number).
Other Textron Piston Aircraft: Various high-wing and low-wing piston singles and twins requiring this specific switch configuration.
Note: Ignition switch variants differ significantly by model year and installed electrical system (14V vs 28V). The aircraft’s Illustrated Parts Catalog (IPC) is the final authority for verifying part number and correct fitment.
Applications Section
Engine Start Sequence: Controls the flow of current to the starter contactor/solenoid.
Magneto Check: Allows the pilot to isolate the magnetos (R and L positions) for a functional check per the manufacturer's procedures.
Engine Shutdown: The OFF position grounds both magneto P-leads, safely stopping the engine by inhibiting spark generation.
Electrical System Isolation: When in the OFF position, the key is removable, securing the ignition system.
Why Choose the C292501-0107?
The C292501-0107 is a core life-critical safety component. Failure of the ignition switch can lead to two major hazards: 1) Uncontrolled Engine Run-On (failure to ground the P-leads in the OFF position), or 2) Failure to Start (inadequate current to the starter solenoid or failure to transfer to the BOTH position). Using an uncertified switch risks using incompatible contact materials that lead to premature wear, oxidation, and arcing. The OEM-certified Textron switch guarantees the precise mechanical detents, the correct spring tension for the START position, and the exact electrical isolation required to ensure the engine starts reliably when needed and stops safely every time.
The fundamental principle of the ignition switch's operation relies on the "ground-to-kill" concept specific to magneto ignition systems. A magneto generates spark when the low-tension primary circuit is OPEN. The ignition switch's OFF position works by using its internal contacts to safely connect the P-leads (Primary Leads) of both magnetos directly to the engine ground. This action effectively shorts out the primary winding of the magnetos, collapsing the magnetic field before the spark is generated. The C292501-0107’s internal rotary mechanism must ensure a robust, low-resistance ground connection in the OFF position to prevent any possibility of a "hot mag" (a magneto that continues to fire when commanded OFF), which represents an extreme fire and safety hazard during shutdown or ground handling. The switch contacts are typically silver-cadmium or copper alloys to maximize conductivity and resist pitting from transient currents.
Note: The C292501-0107 is a life-critical component. The key must be removable only in the OFF position. Installation must be performed by a certified A&P mechanic strictly in accordance with the aircraft’s Maintenance Manual, paying critical attention to the P-lead connections to ensure proper grounding and full magneto isolation (open circuit) in the R, L, and BOTH positions.
Documentation
Textron Aviation (Cessna) Illustrated Parts Catalog (IPC): Essential for verifying the correct part number based on aircraft model and serial number.
Aircraft Maintenance Manual (AMM): Required for the specific wiring diagram and functional check procedure for the magneto system.