Collins 329B-6D Approach Horizon Indicator (26V) – P/N 522-3071-00 | Removed Working

Collins Attitude Horizon Indicator. Maintain dependable attitude reference in your aircraft panel with this serviceable Collins 329B-6D Approach Horizon Indicator, a well-known and widely used instrument in many legacy IFR-equipped aircraft. Built by Collins—one of the most respected names in avionics—this unit has a long-standing reputation for reliability, stable presentation, and durable construction in demanding flight environments.

This particular indicator is a 26-volt unit and was removed from an aircraft during fleet liquidation. It was reported to be functioning properly at the time of removal, making it a strong candidate for repair programs, direct replacement needs, or avionics shop inventory. For operators maintaining legacy Collins-equipped panels, sourcing clean, serviceable units like this continues to be increasingly valuable.

Collins Attitude Horizon Indicator

Trusted Collins Flight Instrument Performance

The Collins 329B-6D has served for decades as a dependable approach horizon indicator in a wide range of certified aircraft. Known for its smooth gyro-driven presentation and clear attitude display, this instrument supports pilots during critical phases of flight including IFR approaches, climbs, and enroute operations.

Operators and technicians continue to value these units because of their:

Proven gyro stability

Clear and readable attitude presentation

Rugged, long-life construction

Strong legacy aircraft compatibility

Established maintenance documentation

For aircraft still operating traditional analog panels, maintaining reliable attitude instrumentation remains essential for both safety and regulatory compliance.

Collins Attitude Horizon Indicator

Removed From Aircraft – Reported Functional

This unit was removed during a large aviation parts liquidation and is reported to have been operational at the time of removal. While not freshly overhauled, its known working history adds confidence for buyers seeking a serviceable core or potential direct-use instrument, depending on installation requirements and inspection results.

Condition overview:

Used unit

Reported working when removed

Clean overall presentation

Cosmetic condition visible in photos

Sold exactly as pictured

As with any used avionics component, proper bench testing and verification are recommended prior to installation in a certified aircraft.

Collins Attitude Horizon Indicator

Key Unit Details

Manufacturer: Collins

Model: 329B-6D

Part Number: 522-3071-00

Voltage: 26V

Condition: Used – working when removed

Country of Origin: United States

Configuration: Approach Horizon Indicator

Status: Available for immediate shipment

This configuration is commonly used in legacy IFR panels but must be matched to the specific aircraft system and voltage requirements.

Collins Attitude Horizon Indicator

Ideal Applications

This Collins horizon indicator is well suited for multiple aviation needs, including:

Direct replacement in compatible aircraft

Avionics shop bench stock

Overhaul or repair programs

Restoration of legacy panels

Fleet maintenance support

Parts inventory for Collins-equipped aircraft

Because many legacy aircraft still rely on traditional attitude indicators, maintaining access to serviceable units remains important for operators and maintenance facilities.

Collins Attitude Horizon Indicator

Important Buyer Notes

Buyers should verify fitment, voltage compatibility, and airworthiness requirements for their specific aircraft prior to installation. As standard practice with used avionics, inspection and testing by a qualified avionics technician is recommended to confirm performance within required tolerances.

The unit is sold as pictured with no additional accessories unless shown.

Collins Attitude Horizon Indicator

A Valuable Legacy Avionics Component

This Collins 329B-6D Approach Horizon Indicator represents a solid opportunity to acquire a proven, serviceable flight instrument from one of aviation’s most respected manufacturers. With its reported working status at removal and classic Collins build quality, it remains a practical option for maintenance programs, repair shops, and operators supporting legacy IFR aircraft.

Dependable heritage. Proven analog performance. Ready for your avionics needs.