Zero-Time Component
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Zero-Time Component refers to an aircraft part that has been completely overhauled and restored to a condition equivalent to a brand-new part, effectively resetting its service life to zero hours.
Definition
A zero-time component undergoes complete disassembly, inspection, refurbishment, replacement of worn parts, and reassembly according to original equipment manufacturer (OEM) standards or approved maintenance procedures. It is then certified to meet or exceed the performance and reliability of a new component.
Importance
- Provides cost-effective alternatives to purchasing new parts while maintaining high levels of reliability.
- Ensures continued airworthiness by meeting stringent testing and certification standards.
- Extends the operational lifespan of aircraft systems while controlling maintenance costs.
Key Features
- Restoration to original design tolerances and specifications.
- Full compliance with OEM or regulatory authority requirements (e.g., FAA, EASA).
- Issuance of new airworthiness certifications or service tags indicating "zero-time" status.
Practical Applications
- Common for critical systems such as engines, landing gear assemblies, flight control actuators, and avionics.
- Used extensively in airline maintenance programs to optimize lifecycle management and reduce downtime.
Example
After a complete overhaul at an FAA-certified repair station, a turbine engine may be designated as a zero-time engine, meaning it can be placed into service with a service life tracking from zero operational hours.
