EN 4912:2025

Overview

EN 4912:2025 - "Aerospace series - ECO efficiency of seats" (CEN) specifies how to determine the ECO efficiency of passenger seats installed in large airplanes with a focus only on the weight aspects of ECO efficiency. It defines seat categorization, a benchmark seat weight (BSW) methodology based on base and feature weights, and the calculation of the eco efficiency index (EEI). This standard is intended for the aerospace sector and complements seat-weight information requirements in EN 4727:2025.

Key topics and requirements

• Scope limitation: Applies solely to weight-related ECO efficiency of passenger seats; it does not cover other sustainability factors.
• Seat categories (I–VI): Seats are classified by included features (Table 1). Categories determine how BSW is calculated and what eco-efficiency penalties apply. A seat must include all features marked “mandatory” to be assigned a category.
• Benchmark Seat Weight (BSW): BSW is a theoretical weight calculated from:
  • a benchmark base weight per passenger (B) and
  • benchmark feature weights per passenger (b_c) listed in Table 2.
  • BSW calculation is scaled by seat configuration: triple seats for categories I–III, double for IV, single for V–VI.
• Eco Efficiency Index (EEI): EEI = (ESW / BSW) × 100
  • ESW (eco efficiency index seat weight) is determined per EN 4727:2025 (see clause 5.8 of EN 4727).
  • EEI is a dimensionless percentage indicating seat weight performance relative to the benchmark.
• Feature weighting: Table 2 provides benchmark weights per pax for features (e.g., recline, headrest, in-seat power, IFE). Some features are included within the benchmark base weight for certain categories; others carry explicit per‑feature weights.

Practical applications and users

Who uses EN 4912:2025:

• Aircraft manufacturers and integrators assessing cabin weight budgets and ECO performance
• Aircraft seat designers and suppliers for product development and competitive benchmarking
• Airlines and lessors evaluating seat options for fleet sustainability and operating efficiency
• Procurement and sustainability teams quantifying weight-driven eco impacts
• Certification bodies and regulatory stakeholders referencing standard weight-based ECO metrics

Practical uses:

• Compare seat designs by EEI to inform procurement and retrofit decisions
• Quantify the weight contribution of seat features for fuel/efficiency trade-offs
• Standardize reporting of seat weight performance across suppliers and fleets

Related standards

• EN 4727:2025 - Aerospace series - Standardized passenger seat weight information (normative reference used to determine ESW)
• ISO and IEC terminology resources (for consistent term usage)

Keywords: EN 4912:2025, ECO efficiency of seats, eco efficiency index (EEI), benchmark seat weight (BSW), aircraft seat weight, passenger seats, large airplanes, CEN, EN 4727:2025.