Technical Standards and Specifications Flashcards
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Read the first 7 Technical Standards and Specifications flashcards as text
In IEC 61511 (Functional Safety for the Process Industry), what distinguishes a 'safety instrumented function' (SIF) from a regular process control function?
Answer: SIFs are specifically designed to bring a process to a safe state upon detection of a hazardous condition
A SIF is an instrumented function with a specified SIL that detects a hazardous process condition and automatically takes the process to a defined safe state.
What does the 'Operating Characteristic (OC) Curve' in acceptance sampling standards like ANSI/ASQ Z1.4 illustrate?
Answer: The probability of accepting a lot as a function of the lot's true quality level
The OC curve plots the probability of accepting a lot against the actual fraction defective, showing how well a sampling plan discriminates between good and bad lots.
ISO 14224 is an international standard that provides a framework for collection and exchange of reliability and maintenance data for what type of industry?
Answer: Petroleum and natural gas industries
ISO 14224 provides a basis for collecting and exchanging reliability and maintenance data for equipment in the petroleum, natural gas, and petrochemical industries.
Under MIL-HDBK-217F, what are the two primary methods for predicting electronic equipment reliability?
Answer: Parts Count and Parts Stress methods
MIL-HDBK-217F provides two reliability prediction methods: Parts Count (for early design phases) and Parts Stress (for detailed design with known stress levels).
Which international standard series defines requirements for quality management systems in the aerospace industry, building upon ISO 9001?
Answer: AS9100
AS9100 is the quality management system standard for aviation, space, and defense organizations, incorporating and extending ISO 9001 requirements.
In the context of IEEE Std 1413 (Reliability Predictions for Electronic Systems), what is the main limitation acknowledged regarding reliability prediction models?
Answer: Field failure rates often deviate significantly from predicted rates due to real-world use conditions
IEEE 1413 acknowledges that reliability predictions are estimates with significant uncertainty, and actual field failure rates can differ greatly from predictions due to use environment and application factors.
What is the purpose of a 'Qualification Test' as defined in most defense and aerospace technical specifications?
Answer: To demonstrate that a design meets all specified requirements before production approval
Qualification testing demonstrates that a design complies with all specified performance and environmental requirements, authorizing the design for production.