State or condition of not meeting a desirable of intended opbjective and may be viewed as the opposite of success
FAILURE
Ability of a system or component to perform its required function under stated conditions for a specified period of time
Reliability
valuable means pf achieving better operation performance in an aircraft maintenance environment, and it is designed to decrrease ,aintenance- related issues and increase flight safety
reliability program
Types of reliability
Statistical Reliability
Historical Reliability
Event-Oriented Reliability
Dispatch Reliability
Is based upon the collection and analysis of failure, removal, and repair rates of systems or components
Statistical Reliability
Simply a comparison of current events rates with those of past experience`
Historical Reliability
Concerned with one-time events such as bird strikes, hard landings, overweight landings, in-flight engine shutdonws… Events that do not occur on adaily basis in airline operations and therefore, produce no usable statistical or historical data
Event-oriented Reliability
Is a measure of the overall effectiveness of the airline operation with respect on-time departure
Dispatch Reliability
Deals with the failure concept
Reliability
Deals with the consequences after he failure, ensure the consequences of failures are minimal
Safety
Bath tub curve
y= hazard rate. x=operating time
Region 1
Burn In period`
Region 2
Useful life period
Region 3
Wear-out period
The totality of features and characterisitcs of a product or service that bear on its ability to satisfy stated and implies needs
Quality
ISO
International Standards Organizations
Most of the industry throughout the world is adopting the international standar of quality. kwon as
iso9000
for faciliities that design/develop, produce, install and service products
9001
procide goos or servies
9002
final inspection and testing
9003
Ability of an Item, Under stated condition of use, to be retained in, or restored to, a state in which it can perform its required functions
Maintainability
Is the probability that a product or sysem is in operation at a specified time
Availability = uptime of system/uptime + downtime
time during which the item is carrying out it assigned mission
MIssion Time
Total time during Which the item is not satisfactory operating state
Downtime