91295-45 - Boeing OEM Latch Assembly

91295-45 – The Boeing Company OEM Remote Control Latch Assembly

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The Boeing 91295-45 is a flight-critical, OEM Remote Control Latch Assembly engineered specifically for the main deck and lower lobe cargo door systems of the Boeing 777 wide-body aircraft family. This precision-manufactured component serves as a primary structural locking mechanism, designed to secure the massive cargo doors against the fuselage structure, withstanding extreme differential pressures and aerodynamic loads encountered during all phases of flight. As an integral part of the aircraft's automated cargo door control system, the 91295-45 latch is actuated by hydraulic or electromechanical means, ensuring reliable, remote operation from the flight deck or external ground panel.

This assembly is not a simple fastener; it is a complex mechanical system designed with multiple redundancies and fail-safe features. Its robust construction and materials are selected to provide exceptional fatigue life, fracture toughness, and corrosion resistance, reflecting its critical role in maintaining the structural integrity of the aircraft's pressure vessel. The precise geometry of its locking components ensures a positive, over-center lock that prevents inadvertent unlatching under G-loads or vibration, making it a cornerstone of the Boeing 777's world-class safety and dispatch reliability.

Key Features

• OEM-Certified Component: Guaranteed fit, form, and function as specified by The Boeing Company for flight-critical applications.

• High-Strength Alloy Construction: Manufactured from aerospace-grade, high-tensile strength materials to withstand extreme structural loads.

• Remote Actuation Design: Integrates seamlessly with the aircraft's hydraulic and electronic cargo door control systems for automated operation.

• Fail-Safe Locking Geometry: Engineered with over-center or equivalent positive locking mechanisms to prevent unintentional release under all flight and ground load conditions.

• Corrosion-Resistant Finish: Features specialized surface treatments to protect against environmental factors, hydraulic fluids, and corrosion, ensuring long service life.

• Precision Machining: Manufactured to exacting dimensional tolerances for perfect alignment and load distribution within the cargo door frame structure.

Technical Specifications

• Part Number: 91295-45

• Component Type: Remote Control Latch Assembly

• OEM Manufacturer: The Boeing Company (CAGE Code: 81205)

• Material: Specific alloy composition is proprietary to Boeing. Components in such critical applications are typically manufactured from precipitation-hardened stainless steel (e.g., 17-4PH or 15-5PH) or high-strength titanium alloy (e.g., Ti-6Al-4V) for their superior strength-to-weight ratio, fatigue resistance, and fracture toughness. Verification must be made against the OEM Component Maintenance Manual (CMM).

• Finish: Multi-layer, corrosion-resistant plating and/or passivation. Specific finish codes must be confirmed via OEM documentation.

• Governing Specification: Conforms to The Boeing Company's proprietary design, manufacturing, and quality assurance standards.

• Certification: Issued with an OEM Certificate of Conformance (CofC).

Aircraft Compatibility

This latch assembly is a factory-specified component for the following Boeing aircraft models.

• Boeing 777-200

• Boeing 777-200ER

• Boeing 777-200LR

• Boeing 777-300

• Boeing 777-300ER

• Boeing 777F (Freighter)

Note: The aircraft's current Illustrated Parts Catalog (IPC) is the sole authoritative document for verifying part number applicability for a specific aircraft serial number.

Applications

The 91295-45 is exclusively utilized within the main deck and lower-lobe cargo door latching systems on the Boeing 777. It functions as one of multiple latch assemblies that engage with striker pins or spools on the door frame to secure the door in the closed and locked position, enabling the pressurization of the aircraft fuselage.

Why Choose the OEM 91295-45?

The cargo door latching system is a flight-critical assembly directly responsible for preserving the structural integrity of the aircraft's pressure vessel. The OEM 91295-45 latch is the result of exhaustive engineering, testing, and certification processes mandated by Boeing and aviation regulatory bodies. Using non-certified or PMA parts in this application introduces unacceptable risks, including the potential for improper material strength, incorrect geometric tolerances, or susceptibility to premature fatigue failure. Sourcing the authentic Boeing OEM part from a trusted supplier like Airparts.aero is the only way to guarantee airworthiness, safety, and compliance with the aircraft's type certificate.

The engineering principle governing the Boeing 91295-45 latch is that of a fail-safe, over-center toggle mechanism. This design ensures that once the latch reaches the fully closed position, the geometric alignment of its internal linkages creates a stable, self-locking state. The primary load path from the door to the fuselage structure acts perpendicularly to the actuator's line of force, meaning that even a complete loss of hydraulic or electrical power to the actuator cannot cause the latch to open. This state is further secured by the high mechanical advantage inherent in the linkage, which multiplies the actuator's input force to generate the immense clamping pressure required. The material selection, likely a precipitation-strengthened, vacuum-arc remelted (VAR) steel or titanium alloy, provides the necessary fracture toughness and fatigue resistance to withstand millions of pressure cycles and the dynamic loads of flight without crack initiation or propagation, ensuring the structural integrity of the fuselage under all operating conditions.

Note: The Boeing 91295-45 is a flight-critical structural component. Installation, rigging, and inspection must be performed by a certified A&P mechanic with specific training on the Boeing 777 airframe. All procedures must be executed in strict accordance with the latest revision of the Boeing 777 Aircraft Maintenance Manual (AMM). Improper installation or servicing can lead to catastrophic structural failure.

Documentation

No public-facing OEM or regulatory documentation was located for this part. All technical data, including the Component Maintenance Manual (CMM), is proprietary to The Boeing Company and must be accessed through a valid Boeing PART subscription or other authorized channel.