CH 18 Reliability - QUIZ Michael Woodruff

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CH 18 Reliability Michael Woodruff

Reliability = Consistency  The reliability program is a valuable means of achieving better operational performance in related issues and increase flight safety.

Two Approaches  When you come to the concept of reliability there are two main approaches:  One looks essentially at the whole airline operation or the M&E operation within the whole.  The other looks at the maintenance program in particular and in segmented pieces.

M&E operation within the whole  Overall airline reliability  This approach to track reliability is mainly used to track delays.  The delays are logged as they are caused:  Maintenance, ATC, or flight ops, etc.  Measured essentially by dispatch reliability.  (how often the airline achieves an on time departure)

Maintenance Program in Particular  This approach is similar is very similar to M&E operations.  The only difference is they concern their selves only with delays due to maintenance.

Types of Reliability  Four Main types  Statistical reliability  Historical reliability  Event-oriented reliability  Dispatch reliability  You can use reliability in various respects  Overall reliability of the airline  Reliability of component or system  Reliability of a person or process

Statistical Reliability  Based upon a collection of analysis of failure, removal, and repair rates of systems or components.  Various maintenance actions are often referred to as “events”.  Event rates are calculated on the basis of events per 1000 flight hours or events per 100 flight cycles.  Many airlines use statistical reliability but give it more credit than it deserves  This is bad for small airlines as results are unaccurate

Historical Reliability  Simply a comparison of current of event rates with those of past experience.  The data collected over time releases to display the overall reliability of a specific airline, for a specific time frame.  History will tell you what part was in the shop for and for how long as statistical reliability doesn’t tell you that.

Event-Oriented Reliability  Concerned with one time events  Bird strikes  Hard landings  Overweight landings  In-flight engine shutdowns  Lightning strikes  Ground and flight interruptions

Dispatch Reliability  A measure of overall reliability and effectiveness of airline operations in respect to on time departure  Receives considerable attention from authorities as well as airlines and passengers  They find a percentage of successful flights out of 100 to make it easy and understandable  60 flights were on time out of a 100 So 60% of their flights were successful and on time.

Data Collection  The data collection process is determined by the discretion of the airlines  Not all airlines collect all data  Used to help the four types of reliability determine the overall success of the airlines  Ten Types  Flight times and cycles of each aircraft  Cancellations and delays over 15 minutes  Unscheduled component removals  Unscheduled engine removals  In-flight engine shutdowns  Pilot reports or logbook write-ups  Cabin log book write ups  Component failures(shop Main.)  Maintenance check package findings  Critical failures

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