M81714/63-20F - TE Feedback Terminal Junction Module

M81714/63-20F – TE Connectivity MIL-DTL-81714 Series I Feedback Terminal Junction Module

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The M81714/63-20F is a flight-critical, environmentally sealed feedback terminal junction module manufactured in strict accordance with Military Specification MIL-DTL-81714, Series I. This component, often specified by OEMs like Textron Aviation or sourced directly under the MIL-SPEC designation, is an essential building block in modern aircraft electrical wiring interconnect systems (EWIS). Its primary function is to provide a common termination point, or bus bar, for multiple Size 20 electrical contacts within a compact, environmentally protected module. This allows for the reliable distribution of power or signals within a wiring harness, significantly simplifying harness construction and maintenance compared to traditional splicing methods.

Engineered by TE Connectivity (formerly AMP/Tyco) and other qualified manufacturers, the M81714/63-20F utilizes a high-reliability design featuring integrated silicone elastomer grommets and interfacial seals to prevent the ingress of moisture, hydraulic fluid, and other contaminants. The module is designed to snap-mount onto standard MIL-T-81714 mounting tracks, allowing for high-density configurations in avionics bays and electrical panels. Its robust construction and proven contact retention system ensure electrical continuity and signal integrity even under severe vibration and G-loading.

Key Features

• MIL-DTL-81714 Series I Qualified: Guarantees adherence to stringent military specifications for performance, materials, and quality in aerospace applications.

• Feedback (Bussed) Configuration: Provides a common electrical connection point for all installed Size 20 contacts within the module.

• Environmentally Sealed: Features integrated wire sealing grommets and an interfacial pin/socket seal, protecting connections from moisture, fluids, and contaminants.

• Size 20 Contact Compatibility: Designed to accept standard M39029/22-192 (pin) or M39029/22-191 (socket) contacts (verify configuration 'F' denotes).

• Modular Snap-Track Mounting: Installs easily onto standard MIL-T-81714 mounting rails for dense, organized wiring configurations.

• High-Reliability Contact Retention: Utilizes a robust retention system (typically metal clips) to securely lock crimped contacts in place, preventing backout.

• Durable Thermoplastic Body: Molded from a high-strength, dielectric thermoplastic material resistant to impact and aviation fluids.

Technical Specifications

• Part Number: M81714/63-20F

• Component Type: Terminal Junction Module, Feedback (Bussed)

• Governing Specification: MIL-DTL-81714, Series I.

• OEM Manufacturer: TE Connectivity (or other QPL manufacturer).

• Contact Size Accepted: Size 20. (M39029/22-192 Pin or M39029/22-191 Socket - 'F' may indicate socket configuration, verify with standard).

• Module Size: Size 20 Module (Physical size standard).

• Material (Body): High-Grade Thermoplastic.

• Material (Seals): Silicone Elastomer.

• Material (Contacts): Not included (Accepts M39029/22 contacts).

• Temperature Range: Typically -65°C to +200°C.

• Mounting: Snaps onto MIL-T-81714 mounting track (M81714/3 or /4).

Aircraft Compatibility

The M81714/63-20F is a standard EWIS component used across a vast spectrum of military and commercial aircraft platforms from all major manufacturers, including Textron Aviation (Cessna, Beechcraft), Boeing, Airbus, Lockheed Martin, Bombardier, Embraer, and Gulfstream, wherever MIL-DTL-81714 Series I feedback modules are specified.

Crucial Note: The correct module type and contact size for a specific location must be verified against the aircraft's official Wiring Diagram Manual (WDM) or engineering drawings.

Applications

• Electrical Power Distribution Busing: Creating common power or ground points within a harness.

• Signal Busing and Distribution: Junctioning multiple signals to a common point.

• Wiring Harness Simplification: Replacing traditional "star" splices with a modular, maintainable junction point.

• Avionics Bays, Electrical/Electronic (E/E) Compartments, Instrument Panels.

Why Choose M81714/63-20F?

Choosing a genuine MIL-DTL-81714 qualified M81714/63-20F module is absolutely essential for the reliability and safety of the aircraft's electrical system. Modern EWIS designs rely on these modules for both density and environmental protection. Using non-qualified components risks poor contact retention (leading to intermittent circuits), inadequate sealing (allowing moisture ingress and potential corrosion or short circuits), or material failures. The failure of a single connection point within a complex harness can lead to the loss of critical flight systems. The MIL-SPEC guarantees the rigorous testing, quality control, and performance required for these flight-critical applications.

The M81714/63-20F module represents a sophisticated approach to wiring interconnect system (EWIS) design, prioritizing reliability and maintainability. Its modularity allows for high-density wiring configurations, crucial in space-constrained avionics bays. The environmental sealing is achieved through two primary mechanisms: individual wire seals provided by the silicone elastomer grommet at the rear (which compresses around the wire insulation as the contact is inserted), and an interfacial seal at the mating face (if applicable to this module type) which compresses between modules or against a mounting surface. This comprehensive sealing prevents electrolyte ingress, drastically reducing the risk of galvanic corrosion between dissimilar metals in the contacts and preventing current leakage or short circuits in damp environments. The contact retention system, typically employing multiple beryllium copper tines within each cavity, provides high tensile retention force on the contact shoulder, ensuring that crimped connections remain secure even under extreme vibration, as defined by MIL-STD testing protocols.

Note: This is a flight-critical electrical system component. Contacts (sold separately) must be crimped onto wires using calibrated, MIL-SPEC tooling (e.g., M22520/1-01 crimper with appropriate positioner for Size 20). Contacts must be inserted into the correct cavity using the proper insertion tool until they "click" and lock into place. Verify contact retention with a pull test (per applicable wiring standards). Unused cavities MUST be filled with appropriately sized sealing plugs (e.g., MS27488 series) to maintain the environmental seal. All work must be performed by certified technicians in accordance with applicable wiring practices (e.g., AC 43.13-1B Chapter 11) and the aircraft manufacturer's specific standard wiring practices manual (SWPM).

Documentation

• MIL-DTL-81714 Specification (Requires Access) (Search for MIL-DTL-81714 in the ASSIST database).

• TE Connectivity Terminal Junction System Catalog (Example) (May contain information on Series I modules).

• Definitive applicability must be confirmed via the aircraft's official Wiring Diagram Manual.