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Independent Orbiter Assessment (IOA): Analysis of the electrical power distribution and control/remote manipulator system 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 Electrical Power Distribution and Control (EPD and C)/Remote Manipulator System (RMS) hardware to determine failure modes, criticality, and potential critical items. To preserve independence, this analysis was accomplished without reliance upon the results contained in the NASA FMEA/CIL documentation. This report documents the results of the independent analysis of the EPD and C/RMS (both port and starboard) hardware. The EPD and C/RMS subsystem hardware provides the electrical power and power control circuitry required to safely deploy, operate, control, and stow or guillotine and jettison two (one port and one starboard) RMSs. The EPD and C/RMS subsystem is subdivided into the four following functional divisions: Remote Manipulator Arm; Manipulator Deploy Control; Manipulator Latch Control; Manipulator Arm Shoulder Jettison; and Retention Arm Jettison. The IOA analysis process utilized available EPD and C/RMS 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 on the severity of the effect for each failure mode.
Document ID
19900001620
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Robinson, W. W. (McDonnell-Douglas Astronautics Co. Houston, TX, United States)
Date Acquired
September 6, 2013
Publication Date
February 17, 1987
Subject Category
Space Transportation
Report/Patent Number
NAS 1.26:185526
NASA-CR-185526
REPT-1.0-WP-VA86001-26
Accession Number
90N10936
Funding Number(s)
CONTRACT_GRANT: NAS9-17650
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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