Zonal Safety Assesment
=============================

ZSA constitutes part of the safety assessment process of
Aerospace Recommended Practice 4761 (ARP4761) –
“Guidelines and Methods for Conducting the Safety
Assessment Process on Civil Airborne Systems and
Equipment”, which comprises the generation of
requirements, as well as verification to support aircraft
development activities.

ZSA is a method of ensuring that the equipment installations within each zone of an aircraft meet adequate safety standards with respect to design and installation standards, interference between systems, and maintenance errors. In those areas of the aeroplane where multiple systems and components are installed in close proximity, it should be ensured that the zonal analysis would identify any failure or malfunction which by itself is considered sustainable but which could have more serious effects when adversely affecting other adjacent systems or components.


Zones
-----

To enter a zone, go to ``Maintainability > Zonal Safety Assessment > Zones`` and click on the ``Add new zone`` button. A popover will appear:

.. image:: img/add_zsa_zone.png
    :width: 696.47pt

The form requires the following data:


- **Code**: Code associated to the zone
- **Description**: Description of the zone
- **Color**: color associated to the zone

The user can upload new 3D models. To upload a new one, click on the ``Choose a File`` button and select the file to upload. Then, click on the ``Update`` button. This process could take a few minutes. 

.. image:: img/add_model.png
    :width: 696.47pt

Once uploaded, the user can select between all the uploaded models:
    
.. image:: img/select_model.png
    :width: 696.47pt

Requirements
-------------

The aim of ZSA is to check if a zone meets safety standards. In order to check it, a list of requirements must be satisfied. All the requirements are listed in ``Maintainability > Zonal Safety Assessment > Requirements``:

.. image:: img/edit_requirement.png
    :width: 696.47pt

The user can perform the following actions with each requirement:

- Add/Edit requirement: to add a requirement, fill the form on the left and click on the ``Add requirement`` button. In case of edition, click on the ``Edit button`` on the right of the table of the requirements. Then, Robin will fill the form on the left of the screen and the user will be able to modify and save the requirement. 
- Delete requirement: The requirements can be deleted clicking on the ``Delete`` button (last column of the requirements table).
- Change requirement status: The status can be Passed, Failed or Not Applicable. For each requirement, the user can select the status with the dropdown.

.. image:: img/change_status.png
    :width: 696.47pt

- Add finding: The user can add finding clicking on the plus button ``+`` in the ID Finding column. It will open the `Findings`_ form. 
- Delete last finding: The user can delete the last finding created for each requirement. To do it, click on the minus button ``-`` in the ID Finding column. 


.. warning::
    If a requirement is deleted, its corresponding findings will be deleted as well. Robin will ask for a confirmation before deleting the requirement.

Findings
---------

All the findings are listed in a table in ``Maintainability > > Zonal Safety Assessment > Findings``.

.. image:: img/list_findings.png
    :width: 696.47pt

To enter an finding, click on the ``Add new finding`` button, a form will appear:

.. image:: img/add_find.png
    :width: 696.47pt

The form will require the following data:

- **Requirement**
- **Progress**
- **Criticality**
- **Comments**
- **Corrective Action**
- **Reference**
- **Attachment**

The user can download a report for each system. The report contains the list of the requirements and the findings.
    
.. image:: img/report_zsa.png
    :width: 696.47pt