 |
 |
 |
 |
 |
 |
 |
- Flight Director Attitude Indicator (FDAI) with housing removed.
- Indicator mounts a ball with three axes of rotation, showing the spacecraft attitude in yaw, roll and pitch.
- Short needles on the outer scales indicate attitude rates.
- Longer needles over the indicator face show commanded attitudes from the spacecraft guidance system.
- Red circles centered at yaw 0 and 180 degree poles indicate where the inertial guidance gimbals are in danger of locking (gimbals from two axes aligning with each other) causing loss of attitude reference.
Also see:
Flown Apollo 15 FDAI:
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
4.5 lbs. (2.0 kg)
 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |