In the United States, instruments required for IFR flight in addition to those that are required for VFR flight are : heading indicator, gyroscopic rate-of-turn indicator that is either a turn coordinator or the turn and bank indicator.
12.
Since the gyrocompass's north-seeking function depends on the rotation around the axis of the Earth that causes heading indicators or directional gyros, which are not gyrocompasses and do not position themselves to north via precession, but are periodically aligned manually to magnetic north.
13.
The autopilot connected a gyroscopic heading indicator and attitude indicator to hydraulically operated dihedral was counted upon to produce the necessary roll stability . ) It permitted the aircraft to fly straight and level on a compass course without a pilot's attention, greatly reducing the pilot's workload.
14.
Raytheon provides a number of other electronic systems for the lifeboat, including the RAYCHART 620, the ST 30 heading indicator and ST 50 depth indicator, the NAV 398 global positioning system, a RAYPILOT 650 autopilot system, and either the R41X AN or SPS-69 radar systems.
15.
Raytheon provides a number of other electronic systems for the lifeboats, including the RAYCHART 620, the ST 30 heading indicator and ST 50 depth indicator, the NAV 398 global positioning system, a RAYPILOT 650 autopilot system, and either the R41X AN or SPS-69 radar systems.
