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1. Introduction
This new set of software requirements is a model based on the following documents:
- The NASA-STD-8719.29 "NASA Technical Requirements for Human-Rating" is the basis for this new section of requirements.
- There is a companion document "Additional NASA software technical requirements for human.docx" which breaks out the software related requirements.
The model also contains additional support pages necessary to demonstrate the full scope of the new requirements.
1.1 Model Pages
The pages in the current model include:
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2. New Pages
2.1 New "C. Software Project Requirements" page
This new page has an additional section below the Chapter 5 table. This new table contains the Software Human Rated Requirements identified in the "Additional NASA software technical requirements for human.docx" document.
New C. Project Software Requirements. It identifies all 18 of the new software requirements with 5 of them linked to new SWE pages.
2.2 New Topic "7.24 - Human Rated Software Requirements"
This Topic is a paraphrasing of the document "Additional NASA software technical requirements for human.docx". All of the content from this document is in this topic except for the Italicized text which is embedded in the appropriate new SWE.
7.24 - Human Rated Software Requirements. This new topic will be added to the existing D. Topics page when it is released.
This new topic references NASA-STD-8719.29 which is SWEREF-458. This topic:
- Identifies requirements that are are Software Human Rated Requirements
- Explains why certain requirements are NOT Software Requirements (Rational column in the table)
- Offers other amplifications or clarifications about the Human Rated Requirements
In the new topic, ALL of the paragraphs from the standard, that are phrased like a requirement (in the form of a SHALL statement), are broken out in the Requirements tab. Only the ones identified as Software Human Rated are given SWE numbers. Some have SWE pages built out (5 so far for this demo).
3. Requirements
The NASA-STD-8719.29 "NASA Technical Requirements for Human-Rating" is the basis for this new section of requirements.
There is a companion document "Additional NASA software technical requirements for human.docx" which identifies the Software Human Related Requirements.
3.1 Project Software Requirements
Requirements pages are modeled after the current SWE pages and only a few currently have contents. In total there are 18 identified as Software Human Rated.
3.2 SWE-8xx Series
The 8xx series was chosen because it is our of the expected range of SWEs coming out of the NPR-7150.2. By keeping it as a 7 character SWE number, all of the other macros that depend on this format for requirements can be used without the need for changes. This includes the SWEREF and reference related macros.
We will need to be custodians of the numbering because there is not a numbering scheme in the NASA-STD-8719.29 that will work for this project. These requirements were derived from the document "Additional NASA software technical requirements for human.docx". Additional requirements exist on the standard and may be factored in later. SWE Titles were derived from paraphrasing the requirement. Many of the components of a SWE are found in these example SWEs.
The table below contains links to new SWEs in the 8xx series along with the requirement statement.
| SWE Title | Requirement |
|---|---|
| 4.3.1 The space system shall provide at least single failure tolerance to catastrophic events, with specific levels of failure tolerance and implementation (similar or dissimilar redundancy) derived via an integration of the design and safety analysis (required by NPR 8705.2). | |
| SWE-802 - Inadvertent Operator Action | 4.3.3 The space system shall be designed to tolerate inadvertent operator action (minimum of one inadvertent action), as verified by a human error analysis, without causing a catastrophic event. |
| SWE-803 - Operator Action With Single System Failure | 4.3.4 The space system shall tolerate inadvertent operator action, as described in Section 4.3.3, in the presence of any single system failure. |
4.3.5 The space system shall provide the capability to mitigate the hazardous behavior of critical software where the hazardous behavior would result in a catastrophic event. | |
| SWE-805 - Detect And Annunciate Faults | 4.3.6 The space system shall provide the capability to detect and annunciate faults that affect critical systems, subsystems, or crew health. |
| SWE-806 - Fault Recovery | 4.3.7 The space system shall provide the capability to isolate and recover from faults identified during system development or mission operations that would result in a catastrophic event. |
| SWE-807 - Data Analysis | 4.3.8 The space system shall provide the capability to utilize health and status data (including system performance data) of critical systems and subsystems to facilitate anomaly resolution during and after the mission. |
| SWE-808 - Autonomous Operation | 4.3.9 The crewed space system shall provide the capability for autonomous operation of system and subsystem functions which, if lost, would result in a catastrophic event. |
4.4.1 The crewed space system shall provide the capability for the crew to monitor, operate, and control the crewed space system and subsystems, where:
| |
| SWE-810 - Crew Override | 4.4.2 The crewed space system shall provide the capability for the crew to manually override higher level software control and automation (such as automated abort initiation, configuration change, and mode change) when the transition to manual control of the system will not cause a catastrophic event. |
| SWE-811 - Crew Control | 4.4.3 The space system shall provide the capability for humans to remotely monitor, operate, and control the crewed system elements and subsystems, where:
|
4.5.1 The crewed space system shall provide the capability for the crew to manually control the flight path and attitude of their spacecraft, with the following exception: during the atmospheric portion of Earth ascent when structural and thermal margins have been determined to negate the benefits of manual control. | |
| SWE-813 - Crew Control Of Uncrewed Spacecraft | 4.6.1 The space system shall provide the capability for the crew to monitor, operate, and control an uncrewed spacecraft during proximity operations, where:
|
| SWE-814 - Interface with Launch Vehicle | 4.7.1.3 The crewed space system shall monitor the Earth ascent launch vehicle performance and automatically initiate an abort when an impending catastrophic failure is detected. |
| SWE-815 - Crew Initiate Ascent Abort Sequence | 4.7.1.4.1 The space system shall provide the capability for the crew to initiate the Earth ascent abort sequence. |
| SWE-816 - Ground Initiate Ascent Abort Sequence | 4.7.1.4.2 The space system shall provide the capability for the ground control to initiate the Earth ascent abort sequence. |
| SWE-817 - Interface With Range Safety Destruct System | 4.7.1.5 If a range safety destruct system is incorporated into the design, the space system shall automatically initiate the Earth ascent abort sequence when range safety destruct commands are received onboard, with an adequate time delay prior to destruction of the launch vehicle to allow a successful abort. |
| SWE-818 - Autonomous Mission Abort | 4.7.2 Earth Orbit Systems. The crewed space system shall provide the capability to autonomously abort the mission from Earth orbit by targeting and performing a deorbit to a safe landing on Earth. |
4. Other Sections in SWEs
4.1 Tab 1 - Requirement
The content of this tab is well regimented. Only a few items will need to be updated:
- Notes - may need to be added if there are none in NASA-STD-8719.29
- History - needs to be built
- Applicability across classes table - May need to be added
- Activity - needs to be identified and added to the Activity scheme
4.2 Tab 2 - Rationale
Rational was derived from NASA-STD-8719.29 in some instances. This may needed to be updated.
4.3 Tab 3 - Guidance
Content from NASA-STD-8719.29 was added here where appropriate. Additional guidance may need to be added.
4.4 Tab 4 - Small Projects
Content for this tab needs to be developed.
4.5 Tab 5 - Resources
Where appropriate, references need to be identified and added to the SWEs.
4.6 Tab 6 - Lessons Learned
Some requirements in NASA-STD-8719.29 contain acknowledgements of Lessons Learned where the requirement would be applicable. Each of these needs to be researched and added to the SWE's tab 6 Lessons Learned.
4.7 Tab 7 - SA
Content will be needed in this tab.
5. To Do
These items are to be done as a part of implementing the HR requirements.
| Description | Completed | Notes |
|---|---|---|
| Add a SWEREF for NASA-STD-8719.29 | SWEREF-458 | added to SWE-801 |
| New "C. Software Project Requirements - HR" page | New C. Project Software Requirements | |
| Build 5 Test SWEs | HR-31 - Single Failure Tolerance SWE-802 - Inadvertent Operator Action | All 5 exist and have a modest amount of content in them coming from NASA-STD-8719.29. |
| Turn "Additional NASA software technical requirements for human.docx" into Topic 7.24 - Human Rated Software Requirements that points to the 800 series SWEs. | New Topic 7.24 - Human Rated Software Requirements added | Added SWEREFs 083, 278, 440, 458 |
Research each SWE for possible Lessons Learned Example, para 4.7.7.3 references a Soyuz mission that fell short. A modification was made and successfully utilized on a later mission. | Add LL to SWE tab 6 as appropriate | |
Add remaining SWEs once titles are agreed to. | ||
Add content to all new SWEs. |
