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D2815000700400 – Airbus Fuel Panel Overpressure Protector Assembly
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Overview
The Airbus D2815000700400 is a flight-critical, structural safety device designed to protect the wing fuel tanks of the A320 Family from catastrophic overpressurization. Located on the underwing refuel/defuel panel, this assembly acts as the ultimate safeguard during pressure refueling operations. Its core component is a precision-engineered rupture disk designed to burst at a predetermined pressure, well above normal operating limits but below the structural limit of the fuel tank. In the event of a primary refuel valve malfunction, this protector ruptures, safely venting fuel overboard and preventing an overpressure event that could compromise the primary wing structure.
As a single-use, non-reclosing device, the D2815000700400 provides a fail-safe mechanism for pressure relief. Its activation is an immediate and clear indication of a significant fuel system malfunction that requires maintenance investigation. For any operator of the Airbus A320 Family, this OEM component is an indispensable element of the aircraft's multi-layered fuel system safety architecture.
Key Features
Critical Structural Protection: Serves as the final line of defense against fuel tank overpressurization, protecting the airframe's primary wing structure.
Precision Rupture Disk: Features a highly engineered metal membrane designed to rupture within an extremely tight pressure tolerance, ensuring reliable performance.
Non-Reclosing Design: A single-use, fail-safe device that provides a full-bore vent path once activated, guaranteeing pressure relief.
Robust Aluminum Housing: The assembly is housed in a high-strength, corrosion-resistant aluminum alloy body for durability and long service life.
Direct OEM Replacement: Engineered by or for Airbus as a direct form, fit, and function replacement, ensuring full compliance with the aircraft's type certificate.
Clear Indication of Fault: A ruptured disk provides unambiguous evidence of a serious overpressure event, mandating a thorough system inspection.
Technical Specifications
Part Number: D2815000700400
Component Type: Fuel Tank Overpressure Protector / Rupture Disk Assembly
OEM Design Authority: Airbus
Material (Housing): Per OEM specification, typically a high-strength, fuel-resistant aluminum alloy.
Material (Disk): A precision-scored or engineered metal membrane designed for a specific burst pressure.
Seal Material: Fuel-resistant elastomer (e.g., Nitrile/FKM) suitable for Jet A/A1.
Actuation Principle: Passive, non-reclosing mechanical rupture at a predetermined differential pressure.
Aircraft Compatibility
This overpressure protector is a standard fitment on the world's most popular narrow-body aircraft family.
Aircraft Application: Airbus A320 Family (A318, A319, A320, A321)
Note: Verification of applicability is the responsibility of the installer. Always consult the current version of the aircraft's Illustrated Parts Catalog (IPC) and Aircraft Maintenance Manual (AMM) to confirm part number eligibility for a specific aircraft serial number.
Applications
Sole Application: Provides ultimate overpressure protection for the wing fuel tanks during ground-based pressure refueling and defueling operations. It is not intended to function in flight.
Why Choose D2815000700400?
The structural integrity of the wing is paramount. A fuel tank overpressure event is a ground emergency with catastrophic potential, including wing rupture, massive fuel spill, and extreme fire hazard. The D2815000700400 is the component designed to prevent this. Using the genuine OEM Airbus part is the only way to guarantee the validated rupture pressure, material specifications, fatigue resistance, and traceability required for this critical safety function. The use of unapproved parts introduces an unacceptable risk of either premature failure or, more dangerously, a failure to rupture, rendering the aircraft's ultimate safety feature useless.
The Airbus D2815000700400 is a sophisticated example of a non-reclosing pressure relief device, operating on the principle of material failure mechanics. The core of the assembly is a solid metal rupture disk, which is engineered to be the system's "mechanical fuse." Unlike a spring-loaded relief valve that can reseat, this device is designed for a single, irreversible actuation to provide a guaranteed vent path. The disk's membrane is manufactured with advanced techniques such as laser scoring or chemical etching to create a precise line of weakness. This ensures that the disk will fail in tension and tear open in a predictable pattern once the net tensile stress, induced by the fuel pressure, exceeds the material's ultimate tensile strength at that specific point. The design is meticulously calculated to resist fatigue failure from thousands of normal pressure cycles (flight and refueling) yet rupture reliably within a very narrow tolerance of its rated burst pressure, ensuring it protects the primary structure without causing nuisance failures.
Note: This is a flight-critical, single-use safety component. Once the disk has ruptured, the assembly must be replaced with a new unit. The root cause of the overpressure event must be investigated and rectified in accordance with the Aircraft Maintenance Manual (AMM). Installation must be performed by a certified technician, using the specified sealant and torque values to ensure a fuel-tight seal.
Documentation
No public-facing OEM or regulatory documentation was located for this part. All technical data, including burst pressure specifications and installation procedures, are proprietary to Airbus and are contained within the official Aircraft Maintenance Manual (AMM).
