NASA-LLIS-0559

Lessons Learned – Redundant Verification of Critical Command Timing (1995)

contributor author	NASA - National Aeronautics and Space Administration (NASA)
date accessioned	2017-09-04T17:52:04Z
date available	2017-09-04T17:52:04Z
date copyright	05/29/1997
date issued	1997
identifier other	FBCEQCAAAAAAAAAA.pdf
identifier uri	http://yse.yabesh.ir/std/handle/yse/175286
description abstract	Abstract: When a new mission software release was uploaded to the spacecraft, the inflight upload failed to include a software patch that had been written to fix a defective countdown timer. Because an independent "watchdog timer" was planned, but never implemented due to constrained project resources, the thrusters continued to fire after the desired shutdown time and the mission was terminated. Recommendations centered on the need for rigorous software configuration management, a watchdog timer to terminate operations, and testbed verification of in-flight software updates.
language	English
title	NASA-LLIS-0559	num
title	Lessons Learned – Redundant Verification of Critical Command Timing (1995)	en
type	standard
page	3
status	Active
tree	NASA - National Aeronautics and Space Administration (NASA):;1997
contenttype	fulltext