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Independent orbiter assessment (ioa): analysis of the dps subsystem
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Lowery, H. J. Haufler, W. A. Pietz, K. C. |
| Copyright Year | 1986 |
| Description | The results of the Independent Orbiter Assessment (IOA) of the Failure Modes and Effects Analysis/Critical Items List (FMEA/CIL) is presented. The IOA approach features a top-down analysis of the hardware to independently determine failure modes, criticality, and potential critical items. The independent analysis results corresponding to the Orbiter Data Processing System (DPS) hardware are documented. The DPS hardware is required for performing critical functions of data acquisition, data manipulation, data display, and data transfer throughout the Orbiter. Specifically, the DPS hardware consists of the following components: Multiplexer/Demultiplexer (MDM); General Purpose Computer (GPC); Multifunction CRT Display System (MCDS); Data Buses and Data Bus Couplers (DBC); Data Bus Isolation Amplifiers (DBIA); Mass Memory Unit (MMU); and Engine Interface Unit (EIU). The IOA analysis process utilized available DPS hardware drawings and schematics for defining hardware assemblies, components, and hardware items. Each level of hardware was evaluated and analyzed for possible failure modes and effects. Criticality was assigned based upon the severity of the effect for each failure mode. Due to the extensive redundancy built into the DPS the number of critical items are few. Those identified resulted from premature operation and erroneous output of the GPCs. |
| File Size | 3948959 |
| Page Count | 124 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900001608 |
| Archival Resource Key | ark:/13960/t09w5b843 |
| Language | English |
| Publisher Date | 1986-10-24 |
| Access Restriction | Open |
| Subject Keyword | Space Transportation Component Reliability Data Acquisition Redundancy Display Devices Failure Modes Assessments Space Shuttle Orbiters Data Processing Equipment Memory Computers Spacecraft Reliability Cathode Ray Tubes Channels Data Transmission Aerospace Safety Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
