HB 7495-2016 in English
VALIDGeneral design requirements for civil aircraft airframe structures
- Issued on:2016-10-22
- Implemented on:2017-04-01
- File Format:PDF
- Delivery:RFQ
| Standard No: | HB 7495-2016 |
| Document status: | VALID |
| Title in English: | General design requirements for civil aircraft airframe structures |
| Title in Chinese: | 民用飞机机体结构通用设计要求 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | RFQ |
| Issued on: | 2016-10-22 |
| Implemented on: | 2017-04-01 |
| Chinese Classification: | V00-Standardization and quality management |
| Professional Classification: | HB-Aviation |
| Related Keywords: | general design requirements
composite materials verification requirements basic strength verification design criteria system damage tolerance design core design criteria |
Introduction
Standard Evolution and Core Changes
| Comparison Dimensions | 1997 Edition | 2016 Edition |
|---|---|---|
| Design Concept | Focus on Static Strength Design | Strengthen damage tolerance and durability design |
| Material System | Mainly Traditional Metal Materials | Added a Special Chapter on Composite Materials |
| Verification Requirements | Basic Strength Verification | Establish a Three-Level Airworthiness Verification System |
Analysis of Key Technical Requirements
4.1 Design Criteria System
The standard proposes 11 core design criteria, among which damage tolerance design requires:
- The main structure must remain safe when there is an initial defect of 0.8mm
- Composite materials must consider the impact of impact damage and manufacturing defects
- Formulate a graded inspection procedure (route/regular inspection/special inspection)
4.6 Material Selection Specifications
Innovatively propose material airworthiness verification requirements:
- New materials must pass 2000 hours accelerated environmental test
- Imported materials must obtain CAAC's
Pass HB 8438 basic verification 2.Material bearing structure Wing surface/fuselage section Complete CAAC special approval 3. All-composite wing Integral wing box Establish independent design allowable value database
Key points of airworthiness verification
Chapter 6 of the standard clearly defines three types of verification tests:
- Design and development test: Determination of material allowable values (must include wet and hot environment data)
- Verification test: Full aircraft static/fatigue test (≥2 times design life)
- Conformity verification: Submit MOC report according to AP-21-AA procedure
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