65-46370-26

RATIO CHANGER ASSY
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About this product
The ratio changer assembly Part 65-46370-26 is a mechanically actuated mixer unit installed in the flight control system to proportionally blend control wheel inputs with speed-brake commands for coordinated spoiler deployment. By converting pilot roll inputs and speed-brake lever position into precise hydraulic signals, it ensures that flight spoilers assist ailerons in roll control while also modulating ground spoiler stowage during high-speed operations
65-46370-26 Datasheet
UOM: EA
Stock Location: Dubai
Hazardous Item: Non-Hazardous Item
Life Limited Part: No
Lead Time: Stock
Certification: Dual Release
8130/EASA Eligible: Yes
PRODUCT DESCRIPTION

65-46370-26

  • Proportional Input Mixing: Combines rotational control-wheel torque and linear speed-brake lever movement through cam-and-lever linkages, delivering smooth, proportional spoiler actuation.

  • Integrated Travel Ratio Mechanics: Adjustable linkage geometry allows precise setting of spoiler travel per degree of wheel or lever motion, ensuring consistent handling characteristics.

  • Redundant Mechanical Stops: Dual-spring detents and hard stops prevent overtravel and provide backup protection if primary linkages wear or fail.

  • Direct OEM Replacement: Form-fit-function compatible with Boeing 737-series spoiler manifolds, permitting a straightforward swap-in during maintenance without airframe modification.


  • Commands flight spoilers to augment aileron deflection, improving roll authority at low airspeeds.

  • Ensures spoilers retract correctly when the speed-brake lever is down to prevent “spoiler float” at cruise.

  • Modulates ground-spoiler deployment on touchdown for optimal braking performance.

  • Used as a direct-replacement assembly in scheduled C-checks or spoiler-system overhauls.


  • Why is proportional spoiler mixing important?

Without it, spoilers would either not assist roll control effectively at low speeds or remain deployed unintentionally during high-speed flight, compromising handling and safety.

  • Can it be adjusted in the field?

Yes, adjustable cams and link lengths allow maintenance crews to fine-tune travel ratios per the aircraft maintenance manual.

  • What are common failure modes?

Wear in bushings or detent springs can lead to imprecise mixing; periodic inspection and lubrication help prevent performance degradation.


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