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Independent orbiter assessment (ioa): analysis of the elevon subsystem
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Riccio, J. R. Wilson, R. E. |
| 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. This report documents the independent analysis results for the Orbiter Elevon system hardware. The elevon actuators are located at the trailing edge of the wing surface. The proper function of the elevons is essential during the dynamic flight phases of ascent and entry. In the ascent phase of flight, the elevons are used for relieving high wing loads. For entry, the elevons are used to pitch and roll the vehicle. Specifically, the elevon system hardware comprises the following components: flow cutoff valve; switching valve; electro-hydraulic (EH) servoactuator; secondary delta pressure transducer; bypass valve; power valve; power valve check valve; primary actuator; primary delta pressure transducer; and primary actuator position transducer. 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. Of the 25 failure modes analyzed, 18 were determined to be PCIs. |
| File Size | 1626896 |
| Page Count | 58 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900001619 |
| Archival Resource Key | ark:/13960/t9n34r273 |
| Language | English |
| Publisher Date | 1986-11-21 |
| Access Restriction | Open |
| Subject Keyword | Space Transportation Pressure Sensors Actuators Component Reliability Transducers Elevons Failure Modes Valves Assessments Space Shuttle Orbiters Switching System Failures Wings Spacecraft Components Spacecraft Reliability Trailing Edges Hydraulic Equipment Aerospace Safety Bypasses Wing Loading 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 |
