Overview

The purpose of this workshop is to give you the opportunity to develop a Fault Tree, and to undertake basic analysis of the Fault Tree both quantitatively and qualitatively. This workshop should build upon your online line learning.

Workshop Objective

Aircraft Refuelling Services is the supplier for the Wing Pods and Refuelling solution or the Voyager aircraft. As part of their contract they have been tasked with demonstrating compliance to a Failure Condition identified from the Aircraft Level FHA of ‘Failure to Return Wing Pod to Clean Configuration’.

Voyager has specified the event as HAZARDOUS and therefore in accordance with CS25.1309 it must meet a 1×10-7 requirement i.e. the design must demonstrate that its probability of occurrence is less than 1×10-7. It has been assessed by the aircraft manufacturer that a trailing hose could strike the aircraft (ailerons, flaps act) during landing or takeoff and will be able ti severely affect the flying characteristics of the aircraft. Voyager has passed this requirement onto the subsystem (Wing Pod) designer.

You are part of the ARS Safety Section. A Fault tree has been part developed by a colleague for the current design. Currently the only solution developed by ARS to return the Wing Pod to a Clean Configuration is the rewinding of the Hose back into the Pod.

Task 1

You are tasked with reviewing the deliverable and identifying errors as well as completing the Fault Tree branches which are currently undeveloped.

a. Identify up to 4 concerns you would have with the attached initial fault tree of ‘Inability to Rewind Hose’. For each concern record the requested improvement or change you would make to the Fault Tree.

b.  Develop the undeveloped branches of ‘Hose Drum Drive Failure’.

  • The hose Drum Design consists of; Hose Drum, Geared Motor to drive hose movement, Hose Drum Chain, Power Connection to the Motor, Various Sprockets and Pins.

Task 1 –

FTA Workshop Workbook