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Independent orbiter assessment (ioa): analysis of the nose wheel steering subsystem
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Mediavilla, Anthony Scott |
| Copyright Year | 1986 |
| Description | The results of the Independent Orbiter Assessment (IOA) of the Failure Modes and Effects Analysis (FMEA) and Critical Items List (CIL) are presented. The IOA approach features a top-down analysis of the hardware to determine failure modes, criticality, and potential critical items. To preserve independence, this analysis was accomplished without reliance upon the results contained within the NASA FMEA/CIL documentation. The independent analysis results for the Orbiter Nose Wheel Steering (NWS) hardware are documented. The NWS hardware provides primary directional control for the Orbiter vehicle during landing rollout. 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. The original NWS design was envisioned as a backup system to differential braking for directional control of the Orbiter during landing rollout. No real effort was made to design the NWS system as fail operational. The brakes have much redundancy built into their design but the poor brake/tire performance has forced the NSTS to upgrade NWS to the primary mode of directional control during rollout. As a result, a large percentage of the NWS system components have become Potential Critical Items (PCI). |
| File Size | 4873442 |
| Page Count | 120 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900001605 |
| Archival Resource Key | ark:/13960/t57d7rx1t |
| Language | English |
| Publisher Date | 1986-11-21 |
| Access Restriction | Open |
| Subject Keyword | Space Transportation Brakes for Arresting Motion Steering Braking Redundancy Failure Modes Spacecraft Landing Assessments Space Shuttle Orbiters Spacecraft Reliability Nose Wheels Aerospace Safety Roll Directional Control 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 |
