NASA-LLIS-0077

Lessons Learned - OMS/RCS System Control Logic

contributor author	NASA - National Aeronautics and Space Administration (NASA)
date accessioned	2017-09-04T15:16:13Z
date available	2017-09-04T15:16:13Z
date copyright	05/20/1992
date issued	1992
identifier other	MIYCQCAAAAAAAAAA.pdf
identifier uri	https://yse.yabesh.ir/std/handle/yse/15415
description abstract	Description of Driving Event: While pressurizing the oxidizer propellant tank, a change in ullage pressure of 8 psi occurred and caused the computer program to indicate that the interface and supply valves were closed. At this point, the engineer felt it was safe to close the dome load valve, in reality opening it. He then opened the interface valve, the pressure online with the module was 190 psig, the supply valve was then opened and the pressure spiked to approximately 400 psig, which ruptured the burst disk. The computer program indicated the incorrect status of the system because the control logic limits were not adjusted/reset prior to starting the operation.
language	English
title	NASA-LLIS-0077	num
title	Lessons Learned - OMS/RCS System Control Logic	en
type	standard
page	2
status	Active
tree	NASA - National Aeronautics and Space Administration (NASA):;1992
contenttype	fulltext
subject keywords	Energetic Materials - Explosive/Propellant/Pyrotechnic
subject keywords	Pressure Vessels
subject keywords	Software