S1913-1 – Textron Aviation OEM Flap Actuator Motor (14V)
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Overview
The S1913-1 is a flight-critical, genuine Textron Aviation (Cessna) Original Equipment Manufacturer (OEM) electric flap actuator motor assembly. This is the primary component responsible for driving the wing flap extension and retraction mechanism on a wide range of popular Cessna single-engine aircraft operating on a 14-volt electrical system. Its function is to convert electrical energy into the high-torque mechanical force needed to move the flaps reliably and precisely against aerodynamic loads.
This sealed unit incorporates a high-torque DC electric motor coupled to a robust reduction gearbox. The output drive interfaces with the aircraft's flap actuation system (typically a jackscrew or torque tube linkage) to provide smooth and controlled flap movement. As the genuine OEM part, the S1913-1 is the only component guaranteed to meet the specific speed, torque, limit switch settings, and environmental requirements dictated by the aircraft's type-certified design, ensuring safe and reliable flap operation.
Key Features
Genuine Textron Aviation (Cessna) OEM Part: Guarantees the part is the factory-specified and fully certified component, ensuring correct performance and airworthiness.
High-Torque DC Electric Motor: Provides the necessary force to reliably extend and retract the wing flaps under all normal flight conditions.
Integrated Reduction Gearbox: A durable gear train significantly multiplies the motor's torque to overcome aerodynamic loads on the flap surfaces.
Designed for 14-Volt Systems: Engineered specifically for aircraft equipped with a 14-volt DC electrical bus.
Sealed Construction: The motor and gearbox assembly is housed within a sealed case to protect internal components from environmental contamination.
Flight-Critical Component: Directly responsible for the operation of the wing flaps, a primary flight control surface essential for takeoff, approach, and landing performance.
Technical Specifications
Part Number: S1913-1
Component Type: Electric Flap Actuator Motor Assembly
OEM Authority: Textron Aviation (Cessna)
Operating Voltage: 14 VDC (Nominal)
Actuation: Electric Motor with Reduction Gearbox
Limit Switches: Internal (Typically - must be confirmed by specific drawing).
Governing Specification: Textron Aviation Engineering Drawing S1913.
Aircraft Compatibility
This OEM flap actuator motor is the standard component for numerous Cessna single-engine aircraft operating on 14-volt electrical systems.
Primary Textron Aviation Platforms:
Cessna 172 Skyhawk (specific models and serial numbers, typically earlier variants)
Cessna 177 Cardinal (specific models and serial numbers)
Cessna R172 Hawk XP
Cessna FR172 Reims Rocket
Note: Verification of applicability is the absolute responsibility of the installer. The aircraft's current Illustrated Parts Catalog (IPC) for its specific serial number is the final and absolute authority for confirming part number eligibility.
Applications
Sole Application: To provide the motive force for extending and retracting the wing flaps on specified Cessna aircraft.
Why Choose S1913-1?
The reliable operation of the wing flaps is essential for safe takeoffs and landings. A failure of the flap actuator motor can lead to asymmetric flap deployment (a dangerous roll condition), the inability to retract flaps after takeoff, or the inability to extend flaps for landing, significantly increasing approach speed and landing distance. Only the genuine Textron OEM S1913-1 is guaranteed to provide the correct operating speed, torque output, and limit switch functionality specified in the aircraft's certified design. Using a non-certified or improperly overhauled motor risks catastrophic failure of this critical flight control system.
The S1913-1 actuator operates on fundamental electromechanical principles to convert low-power electrical signals into high-force mechanical motion. Internally, a permanent magnet DC motor spins at high RPM when energized. This high-speed, low-torque rotation is fed into a multi-stage reduction gearbox, typically using a worm gear drive in the final stage. The worm gear provides a very high reduction ratio in a compact space and, critically, is inherently non-backdriving – meaning the aerodynamic loads on the flaps cannot force the motor to rotate backward, effectively locking the flaps in their last commanded position. The output shaft of the gearbox then drives the aircraft's flap mechanism, often a rotating jackscrew assembly. Internal limit switches are incorporated within the actuator or the airframe linkage to automatically de-energize the motor when the flaps reach their fully extended or fully retracted positions, preventing damage to the structure or the actuator itself.
Note: This is a flight-critical component. Installation, rigging, and operational checks must be performed by a certified A&P mechanic in strict accordance with the aircraft maintenance manual. Correct installation ensures proper engagement with the flap drive mechanism. Limit switch function and flap travel limits must be verified after installation before the aircraft is returned to service.
Documentation
All technical data, installation procedures, and testing criteria for the S1913-1 actuator are proprietary to Textron Aviation. This information is contained within the official Maintenance Manual and Illustrated Parts Catalog for the applicable aircraft model. No public-facing documentation is available.