+-------------------------+--------------+---------+-------------------+
| 1\. DRD Title           | 2\. Date of  | 3\. DRL | RFP/Contract No.  |
|                         | current      | Line    | (*Procurement     |
| **SSTF Fault Tree       |              |         | completes*)       |
| Analysis**              | version      | Item    |                   |
|                         |              | No.     | NAS 9 -18181      |
|                         | October 2001 |         |                   |
|                         |              | 32      |                   |
+-------------------------+--------------+---------+-------------------+
| 4\. Use (*Define need   |              |         | 5\. DRD category: |
| for, Intended use of,   |              |         | (*check one*)     |
| and/or anticipated      |              |         |                   |
| results of data*)       |              |         | X Technical       |
|                         |              |         |                   |
| **Provides Fault        |              |         | € Administrative  |
| Analysis for the Space  |              |         |                   |
| Station Full Task       |              |         | € SR & QA         |
| Trainer (FTT).**        |              |         |                   |
+-------------------------+--------------+---------+-------------------+
| 6\. References          | 7\.          |         |                   |
| (*Optional*)            | Interr       |         |                   |
|                         | elationships |         |                   |
|                         | (*e.g., with |         |                   |
|                         | other DRDs*) |         |                   |
|                         | (*Optional*) |         |                   |
|                         |              |         |                   |
|                         | **30, 31,    |         |                   |
|                         | 61**         |         |                   |
+-------------------------+--------------+---------+-------------------+

8\. Preparation Information (*Include complete Instructions for document
preparation*)

A. Fault Tree Analysis - This document shall provide a fault isolation
tool for the Space Station Full Task Trainer (SSFTT). Fault Tree
Analysis (FTA) uses deductive logic (Top Down) and focuses on the entire
hardware system by assuming a system failure and determining the
possible causes to provide a rapid and effective method of determining
the source of a real-time fault in the FTT. This document is meant to
guide the Systems Analysts (SA) and/or the Maintenance Technician (MT)
from the initial problem at the system/subsystem level down to the
lowest replaceable unit (LRU) responsible for the problem. This will be
done using the hardware failure mode signatures identified in the FMEA.
There is no intention to completely list all levels of a LRU's internal
fault isolation aids and procedures in this document, nor is this
document concerned with the actual repair or actions to be taken to
accomplish service restoration. The FTA will be a separate section of
the M&O Manual (DRLI 61) and will include the following, where
applicable:

1\. Introduction

2\. Guidelines and Definition

3\. Individual System/Subsystem Overview

4\. Individual System/Subsystem Fault Tree Analysis

Note: There is no requirement for a Fault Tree Analysis on the Interim
Control Module.