reliability block diagram

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CONTENTS

6 APPENDIX............................................................................................................

GLOSSARY
WRD - Weibill's Reliability Distribution
RBD - Reliability Block Diagram
MSG - Maintenance Steering Group
RCM - Reliability Centred Maintenance
EDP - Engine Driven Pump
EMDP - Electrical Motor Driven Pump
FTA - Fault Tree Analysis

ABSTRACT The reliability analysis of Boeing 737NG's hydraulically actuated rudder control system is carried out using WRD, RBD, FTA and MSG-3 analysis and an RCM strategy is designed to maintain the reliability of the system to specified standard.

1 INTRODUCTION
1.1 BACKGROUND
From the past few decades there have been some significant changes in the field of aviation. New aircrafts, new technologies with new concepts have been built, but, with increase in technology there is also an increase in risk factor. As we know no human activity or system is risk free. So a safety technology has been developed in order to balance the risks of the system to its advantages. Since every system or activity has its risks and failures, a technology is developed to optimize those risks. This safety technology is known as Reliability.
Reliability, it can be defined as "the ability of the system to perform under the desired operating conditions and whenever required".
To maintain the system reliability there is a need to develop some reliability processes. The maintenance process thus developed and followed to maintain the aircraft reliability is RCM or Reliability Centred Maintenance.
1.1.1 Reliability Centred Maintenance (RCM)
RCM it is a process used to decide what is to be done to ensure that a system continues to do what it is supposed to in its present operating state. Any process before it can be called as RCM needs to meet the minimum criteria. "It consists of 7 questions which are respectively worked as shown:
1. What

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