The principle of fail safe design of an aircraft is based on the

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Design Procedure >>Machine Size, design means and deciding The Shap Size & Material of machine Parts So That They Work Safely and efficiently The basic Procedure is carried out in the The following Steps.
1)Need or aim
2)Definition of the problem.
3) Collection of Data
4) Selection of material.
5) Design Calculation
6) selection of Standard parts.
7)Checking for failure.
8) Preparation of Drawings.
9) Production. And Testing.
1)Need Or aim: First The Need of machine or components is Identify. Ex lifting a load, Transmitting Power Cutting marks

2) Definition of the Problem: The Exact Problem is  Clearly defined It Includes.
1)Types of work to be done, 2) Load and speed, 3) working condition, 4) space and cost limits.
3) Selection of material: Suitable material is choosen based on
1)Strength, 2)Durability, 3) cost, 4) Availability.
4)Collection of data: Important data is Collected such as

1) forces and Stresses, 2) material properties, 3) Standard dimensions
5) Design Calculations Calculation are done To Find.

1) Size of components., 2) Stress, 3) Factor OF Safety

This Ensure The Port is safe under working condition

6) Selection of standards Parts: Standard component like bolts, bearings keys, gears are selected to reduce cost and Simplify manufacturing.
7) Checking For failure: The design is checked. Agains possible such as 1) breakings 2) Fatigue.
8) Preparation of Drawing: Detail Drawing are Prepared Showing. 1)Dimensions 2) Tolerance 3) surface finish.
9)Production & Testing :-The Component is manufactured and Tested To Ensure it works as required.

What is Standardization Explain its Importance  design?
Standardization means using Common rate. Sizes, materials, methods, and Specification While design and Making Products. 

Importance of Standardization an design.
1) Improves Quality., 2) Reduces cost., 3) Saves Time, 4) Ensure Safety., 5) Interchangeability of Parts., 6) Easy manufacturing, 7) Customer Satisfaction.
Examples. Standard bolts and Nuts Can be used In many machines ,,Mobile Chargers Follow Standard port like USA.

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