You may define unlimited number of failure conditions for each function of the functional tree. The table in the lower part of the screen displays all failure conditions of specific function currently selected in the functional tree.
To work (create, edit, delete etc.) with failure conditions of the specific function, at first select this function in the functional tree.
To create a new failure condition (FHA mode):
| 1. | Select specific function. |
| 2. | Select the first field in the table below and start writing the failure condition description: |
| 4. | Select relevant phases in the next field: |
| a. | Press the "…" button, phases list will appear |
| b. | Select relevant phases from the list (you may select multiple phases) |
| c. | If required Phase is not found in the list, add it to the library – see "Working with Safety/FMECA Library" later in this document. |
| 5. | Select failure condition end effect in the next field: |
| a. | Press the "…" button in the "End Effect" column, End Effects list will appear. |
| b. | Select relevant EE from the list (you may select only one EE). |
| c. | If required EE is not found in the list, add it to the library – see "Working with Safety/FMECA Library" later in this document. |
| 6. | Fill in other fields in the same table line – Verification, Remarks, Detection, Action etc. |
| 7. | Specify or create a safety assessment method for this failure condition: |
| a. | Right-click the failure condition, pop menu will appear: |
| b. | select "Safety Assessment Definition" from the popup menu, assessment definition screen will appear: |
| c. | Add or create any number of probability assessment means using "Add RBD", "Add FTA" and "Add Markov" buttons below. |
| d. | Select one of linked methods as "final" by selecting it and pressing "Select/Deselect" button. The “final” method will be used in SSA reports. Selected “final” method will appear in green color in the methods list. This “final” method will be used to calculate a probability of the currently selected failure condition. |
| e. | To delete Safety Assessment means from the list, select the corresponding record and press "Delete" button. |
| f. | To open and edit Safety Assessment means directly from the "Safety Assessment Definition" screen, select the corresponding record and press "Open" button. |
| g. | Press "Ok" button to save the selected assessment methods and return to the failure conditions list. |
There is possibility to group failure conditions with common behavior. Failure condition group will appear on a gray background and specific failure conditions will appear below the group, as shown on the picture below:
To create a new failure condition inside the group:
| 1. | Select the group cell in the failure conditions table |
| 2. | Right-click on it and choose "Add failure sublevel" from the popup menu: |
| 1. | Enter name of the new failure condition to be added to the selected group. |
| 2. | The new failure condition appears inside the group: |
| 3. | Fill in the information in all other fields of the new failure condition. |
To edit an existing failure condition data:
You always can change any failure condition data by clicking the required table cell and writing the new data (or clicking the "…" button and selecting different phases or End Effects).
To delete a specific failure condition, right-click the failure condition in the failure conditions table and select "Delete" from the popup menu.
To create a new failure condition (AFO mode):
| 1. | Select specific function. |
| 2. | Make sure to switch to the "AFO" mode in "View" menu. |
| 3. | Select the first field in the table below and enter the failure condition number: |
| 2. | Fill Failure condition name in the next field. |
| 3. | Specify Safety Assessment Method (FTA) as described in "To create a new failure condition (FHA mode)" section earlier in this document, paragraph 7. |
| 4. | Switch to the next field and |
| a. | write down the logical expression explaining failure condition cause |
Or
| b. | Let RAM Commander build the logical expression explaining failure condition cause automatically: |
| ii. | FTA earlier selected as "Safety Assessment Method" for this failure condition, will be displayed in a plane format: |
| iii. | Expand the tree branches to the desired level of logical expression detalization; |
| iv. | Press "Ok" button. Logical expression will be build according to the FTA state on the previous screen: |
| 2. | Select relevant phases in the next field: |
| a. | Press the "…" button, phases list will appear |
| b. | Select relevant phases from the list (multiple phases can be selected) |
| c. | If required Phase is not found in the list, add it to the library – see "Working with Safety/FMECA Library" later in this document. |
| 3. | Select failure condition end effect in the next field: |
| a. | Press the "…" button in the "End Effect" column, End Effects list will appear. |
| b. | Select relevant EE from the list (you may select only one EE). |
| c. | If required EE is not found in the list, add it to the library – see "Working with Safety/FMECA Library" later in this document. |
| 4. | Fill in other fields in the same table line – Indication, Actions etc. |
