Severity of downtime influence factors impacting naval ship operational availability - A five-stage Delphi consensus procedure with snowballing technique

Al Shafiq Bin Abdul Wahid*, Mohd Zamani, Sunarsih, Mohd Najib Bin Abdul Ghani Yolhamid, Mohamad Abu Ubaidah Amir Abu Zarim, Aisha Binti Abdullah, Nur Hananibt Ahmad Azlan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Operational availability of naval ships, which reflects the number of days they are available for operational tasking in a year, is a complex problem. The number of days the ships are able to spend in an area of operations reveals the sustainability of the naval force in showing of presence and deterrent capability. There have been numerous literatures on calculating downtime through Mean Time between Failure (MTBF) and Mean Time to Repair (MTTR) to obtain availability value; however there have been limited literatures pinpointing to the root cause of the various downtime, called Downtime Influence Factors (DIF) for naval vessels. The limited literatures on DIFs of naval vessels are further restricted in the study of a single factor such as obsolescence or spares availability, or two or three factors at most, whilst in reality the DIFs encompasses a wide range of human and equipment related factors that most researchers have not attempted to study. The situation is further complicated by issues of equipment and component redundancies as well as possible interdependencies between each DIFs. The current research uses a five-stage sequential modified Delphi approach including risk analysis and snowballing technique to identify, validate and rank the severity of all DIFs from two sets of experts in naval ship maintenance contracts. The study revealed 15 severe DIFs involving human and equipment related factors impacting naval ship availability. The result complemented and validated the findings of previous study by the authors involving 30 experts. The results enable the navies and supporting industries to focus on pinpointed areas of concern to enable them to increase the operational availabilities of their ships in the fleet.

Original languageEnglish
Pages (from-to)939-946
Number of pages8
JournalARPN Journal of Engineering and Applied Sciences
Volume13
Issue number3
Publication statusPublished - 1 Feb 2018
Externally publishedYes

Keywords

  • Delphi method
  • Downtime influence factors (DIFs)
  • Naval vessels
  • Navy ship maintenance
  • Operational availability

Fingerprint

Dive into the research topics of 'Severity of downtime influence factors impacting naval ship operational availability - A five-stage Delphi consensus procedure with snowballing technique'. Together they form a unique fingerprint.

Cite this