SPERRY Pictorial Deviation Indicator Model R1

Circa 1970's to 1980's (ESTIMATED)

Use Case

Used for aircraft navigation, particularly when flying using radio navigation aids like VOR (VHF Omnidirectional Range), ILS (Instrument Landing System), or GPS-based systems.

• Navigation Guidance: It helps the pilot determine the aircraft's lateral position in relation to a selected course line (radial). The vertical needle or bar indicates deviation from the intended flight path; if the aircraft drifts off course, the needle moves, showing the pilot which direction to steer to return to the centerline.

• Instrument Approaches: The R-1 is vital for flying instrument approaches, where precision is paramount, especially in poor weather conditions where visual cues are limited. It might also incorporate a horizontal needle to provide vertical glideslope guidance during ILS approaches, though the specific R-1 in the image primarily shows the vertical deviation.

• Integration: It is often part of a more integrated system, such as a Horizontal Situation Indicator (HSI) display, providing a comprehensive view of heading, course, and position to reduce pilot workload.

(H-8.5cm x W-8.5cm x D-25cm)