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Artificial Horizon

Technical Information

Catalogue No: C0806
Category: Gyro
Object Type: Indicator/Instrument
Object Name: Artificial Horizon
Part No: 6A/4338292
Serial No: 119/59
Manufacturer: Ferranti
Division: Unknown
Year of Manufacture: 1959
Dimensions: Width (mm): 83
Height (mm): 83
Depth (mm): 230
Weight (g): 2,240
Location: Triple Shelf Unit, RH (indicators) [Main Store]

Horizon Artificial Mk.6B
St. Rf. No. 6A/4338292
Serl. No. 119/59
Ferranti Ltd.
Moston Manchester.


The artificial horizon, (also known as an attitude indicator (AI) or gyro horizon) is a flight instrument that informs the pilot of the aircraft orientation relative to Earth's horizon, and gives an immediate indication of the smallest orientation change. The miniature aircraft and horizon bar mimic the relationship of the aircraft relative to the actual horizon. It is a primary instrument for flight in instrument meteorological conditions.
The heart of the AI is a gyroscope (gyro) that spins at high speed, from an electric motor. The gyro is mounted in a double gimbal, which allows the aircraft to pitch and roll as the gyro stays vertically upright. A self-erecting mechanism, actuated by gravity, counteracts any precession due to bearing friction. The casing is marked (in ink): "FLM/M/3 /59" & "FLM/R/9 /76" & also marked:
"Sealed instrument handle with care"
"The attachment nuts are fitted with unified threads"
The instrument is fitted with a 1.1m long cable.
This type of instrument was fitted to the Hawker Hunter and Westland Whirlwind Helicopter aand many more.

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