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Maintenance stands are the most valuable maintenance resources and provide the necessary maintenance space and maintenance facilities for aircraft maintenance. To expand the maintenance market, maintenance, repair and overhaul (MRO) urgently need to achieve a reasonable schedule between aircraft maintenance requirements and maintenance stand capability to improve aircraft maintenance continuity and reduce the risk of scratching due to aircraft movement. This study aims to design a maintenance stand scheduling (MSS) model based on spatiotemporal constraints to solve the problem of maintenance stand schedules.

To address the problem of maintenance stand schedules, this study introduces mixed-integer programming algorithm to design the MSS model on the basis of classical hybrid flow shop structure. When designing the optimization objective function of MSS modeling, the spatiotemporal constraints are mainly considered. Specifically, first, the spatial constraints between maintenance stands are fully considered so that more aircraft can be parked in the workshop. Second, the optimization objective is designed to minimize the number of aircraft movements by defining multiple maintenance capabilities of the stand. Finally, a solution based on spatiotemporal constraints is proposed in the solving process.

A set of MRO production data from Guangzhou is used as a test data set to demonstrate the effectiveness of the proposed MSS model.

The types of maintenance stands are defined and divided into four categories: fixed stand, temporary stand, half-body stand and engine ground test stand, which facilitates optimal modeling; a new scheduling model is designed considering both temporal constraints and spatial constraints, which can improve both the utilization of maintenance stand and safety (reduce the risk of scratching between aircraft).

This paper aims to explore the role played by the National Archives of South Africa in human rights promotion and protection. The study examined the challenges that archivists encounter when undertaking archival functions, such as acquisition, appraisal and access provision, that contribute to forming documentary archives crucial for human rights promotion and protection.

A review of literature dealing with acquisition, appraisal and access was used in this research. It was supplemented with interviews.

This paper provides recommendations of benefits in the field of archives management with a focus on the areas of acquisition, appraisal and access. The transformational discourse in the jurisdiction of archives management challenges archival institutions to be active players in selecting historical and cultural archives’ significance that is significant in human rights protections. However, despite judicial requirements that recommend the importance of archives, there is evidence that archival functions such as appraisal, acquisition and access are not being fully used, resulting in national archives institutions that are subject to irregularities that contribute to an unbalanced archives collection.

The paper was limited only to the National Archives of South Africa.

The paper makes practical implications concerning the acquisition, appraisal and providing access to human rights records.

Sufficient funding resource allocation ought to be provided to advance human rights promotion.

This paper offers informed recommendations to address the challenges of acquisition, appraisal and access provision of archive materials. The availability of archives materials reinforces the community by aiding to protect legal rights and prevent human rights violations. It was, thus, necessary to establish whether the National Archives of South Africa is actively building the archives collections that are important for human rights promotion and protection.