Discussion
Instruments and their power source in a typical light aircraft.
| Instrument | Drive | Lost on vacuum failure |
|---|---|---|
| Attitude indicator | Vacuum | Yes |
| Directional gyro | Vacuum | Yes |
| Turn coordinator | Electrical | No |
| Altimeter and airspeed | None | No |
Why are the instruments split across two power sources in this way?
Answer: B
Correct answer: So a single failure cannot remove every attitude reference
Read the third column. A vacuum failure takes the attitude indicator and the directional gyro together, but the turn coordinator is electrical and survives it, and the pressure instruments need no power at all.
The pilot therefore retains a rate-of-turn reference and can fly partial panel. Splitting the drive is a deliberate redundancy measure rather than an economy, and electrical gyros show attitude perfectly well - larger aircraft use them throughout.
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