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Independent Orbiter Assessment (IOA): Analysis of the displays and controls subsystemThe 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 corresponding to the Orbiter Displays and Controls (D and C) subsystem hardware. The function of the D and C hardware is to provide the crew with the monitor, command, and control capabilities required for management of all normal and contingency mission and flight operations. The D and C hardware for which failure modes analysis was performed consists of the following: Acceleration Indicator (G-METER); Head Up Display (HUD); Display Driver Unit (DDU); Alpha/Mach Indicator (AMI); Horizontal Situation Indicator (HSI); Attitude Director Indicator (ADI); Propellant Quantity Indicator (PQI); Surface Position Indicator (SPI); Altitude/Vertical Velocity Indicator (AVVI); Caution and Warning Assembly (CWA); Annunciator Control Assembly (ACA); Event Timer (ET); Mission Timer (MT); Interior Lighting; and Exterior Lighting. Each hardware item was evaluated and analyzed for possible failure modes and effects. Criticality was assigned based upon the severity of the effect for each failure mode.
Document ID
19900002458
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Trahan, W. H. (McDonnell-Douglas Astronautics Co. Houston, TX, United States)
Prust, E. E. (McDonnell-Douglas Astronautics Co. Houston, TX, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1987
Subject Category
Space Transportation
Report/Patent Number
NAS 1.26:185563
NASA-CR-185563
REPT-1.0-WP-VA87001-06
Accession Number
90N11774
Funding Number(s)
CONTRACT_GRANT: NAS9-17650
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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