SYS RAMS FS17
SYS RAMS FS17
SYS RAMS FS17
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Flashcards
Active = produces immediate effect Latent= produces no immediat effect
Active= will produce large input in the system (erroneous function of the servovelve) Passive= is observable but wont have an input to the system (reduction of hydraulic flow in the actuator)
discrete: result of a game (win/draw/loss) continous: hours of operation
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State in which risk is acceptable
potential for harm or disposition of something to cause detriment
the implementation of an aircraft design in which the seriousness and the likelihood of occurence of potential harms for passengers and general public is acceptable
1309
high level functional description of the system, failures to each item
How does a failure condition affect the higher system level?
It should guide the development process
Prevention or mitigation of HAZARDS
SAFETY ASSESSMENT, design of each item has to be set in relationship with all other components to have an acceptable risk
Functional Hazard Assessment Focus on Functions not equipment
To identify all failure conditions and describe them in functional and operational terms
Very early in the development process, updated when new failure conditions occur.
Manifestation in a system or equipment that may lead to a Failure.
Event that the affected function can no longer operate as intended.
Condition which affects the aircraft or the occupants
The way in which a failure of a system occurs.
Consequences of a failure.
for identification and evaluation of potential hazards related to an aircraft; early in the development process to achieve a safe design
FHA provides input to a multitude of design and airworthiness activities
? Classification of changes ? SW and HW Design Assurance Level (DO-178 / DO-254) ? HIRF/Lightning and other DO-160 Level of assessment ? Input for SSA ? List of Essential/Non-essential loads ? List of Continued Safe Flight and Landing (CSFL) equipment ? Continued Airworthiness Process
1. Provide aerodynamic performance 2. Control aircraft trajectory 3. Control aircraft energy 4. Provide survivable environment 5. Provide situational awareness 6. Maintain structural integrity 7. Provide emergency services
1) Refference Number 2) Function Aircraft System 3) Failure Condition 4) Flight Phase 5) Effect on A/C or Crew 6)Classification 7) Required Probability 8) Supporting Material
No Effect 10-3 Minor 10-3 Major 10-5 Hazardous 10-7 Catastrophic 10-9
Mean Time to Failure
Failure Modes and Effectife Analysis Bottom-Up Method that is used to identify the causes of failure and the effects that the failure has on the function
functional FMEA piece part FMEA
Deep understanding of the system.
- Local Failure - Next higher Level Effect - End Effect (Aircraft Level)
Time Factor
Capacitance Factor
Voltage Stress Factor
Series Resistance Factor
Quality Factor
Environment Factor
? Helps in identify how the system is most likely to fail (especially single point of failure) ? Points to failures that are most difficult to detect ? List actions to prevent causes or to detect failure modes ? Allows to identify areas of the system that have the largest impact ? Provides a foundation for maintainability and logistics analyses ? Determines the MTBF and MTBCF
