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Handing over a software system from development to maintenance is still an under-researched domain. The software community has a hazy insight into its constellation and inherent activities. In this paper, we have evaluated a preliminary version of a taxonomy of handover activities within one Swedish software company. The evaluation is conducted in an in-house handover context only. Despite this, our...
To successfully conduct postdelivery maintenance, organizations must be actively involved in the predelivery maintenance phase. For this, they need a predelivery maintenance process model. Right now, there are only two such models and they are still in their infancy. In this paper, we compare one of them, the EM3 Predelivery/Prerelease model, to its corresponding predelivery process at AMIS Software...
No fault found (NFF) events are critical and well-known problems for certain aircraft items. This paper presents a study of these events for repairable items with on-condition maintenance, based on operational data from a military aircraft. Some findings are that: the number of NFF events is influenced by item type and number of repairs; most NFF events are initiated by faults recognized during operation;...
Little is known about of how software embedded in complex industrial technical systems is maintained. In this paper, we identify industrial maintenance process steps and position software maintenance activities within them. We do this in the context of JAS 39 Gripen, a multi-role combat aircraft developed by Saab.
In this paper the appropriateness of initial preventive maintenance task intervals and the improvement of changed intervals are evaluated. The evaluation criteria are partly derived from logic found in the RCM (Reliability-Centered Maintenance) methodology. Empirical data is related to the whole life cycle of the Swedish military aircraft system FPL 37 Viggen, from 1977 to 2006. The analysis shows...
It is clear that the simple dasiaperfect repairpsila assumption is not immediately applicable to any of the studied types of hardware, i.e. cooling turbine., high-voltage generator, hydraulic accumulator, and radar transmitter. Hence, the assumption of 'perfect repair' needs to be validated for each specific type of item. Assumptions based on the type of physical hardware (e.g. mechanical item or...
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