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Common Component Reliability Issues
Please click on any of the topics below to find out more information
 Bad from Stock
Infant Mortality
Rogue Parts
Poor Design
Batch Problem
Predictable Life Cycle
Beyond Useful Life
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AVIATION RELIABILITY SERVICES - COMPONENT RELIABILITY |
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Component Reliability - Bad From Stock
Consider the consequences of a serviceable part that is ordered from stock and found to be defective when it is installed on an aircraft:
1. Two trips are made from the stock room to the airplane.
2. The line mechanic must remove/replace/test the part two times.
3. You have used two serviceable spares (for one problem).
4. You have two parts that must be routed to the repair shop.
Not to mention that it took at least twice as long to perform the repair and get the aircraft back into service. If this happened during the day, the likelihood of a flight delay is high. You also have lost productive manpower - because the mechanic involved in the repair is unavailable to perform other maintenance if needed.
Parts are bad from stock for many different reasons. The more common reasons are as follows:
1. The part was damaged during shipping and handling.
2. The part was damaged during installation.
3. The part was not properly repaired during the previous repair shop visit.
4. Something else on the aircraft is responsible. Example: A shorted wiring harness that blows a radio fuse.
5. The part was improperly stored - or has been stored for an extended period of time without being exercised. Example: An actuator seal is dry-rotted due to poor lubrication and/or extended storage in a hot/humid environment.
A good reliability program will have a defined process to track, investigate and resolve bad from stock incidents. This is a “Lessons Learned” process. Your goal is to learn why the part was bad from stock and what can be done to prevent it from happening again. You should also keep track of all associated costs related to each incident. Quantifying costs will help you prioritize which issues need immediate attention. Cost tracking is also an excellent resource for negotiations with your repair shop or shipping carrier (to resolve the issue if they are responsible for the incident).
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