Honeywell IVA-81D TCAS VSI 066-01171-3706

Honeywell IVA-81D TCAS Vertical Speed Indicator (P/N: 066-01171-3706)

The Honeywell IVA-81D (Part Number: 066-01171-3706 / Grimes/Ontic Equivalent: 80-5181-13-6) is a 3 ATI integrated Traffic Alert and Collision Avoidance System (TCAS II) and Instantaneous Vertical Speed Indicator (IVSI). Engineered to replace legacy cathode-ray tube (CRT) displays like the IVA-81A, the IVA-81D provides high-contrast, wide-angle active-matrix color LCD presentation of climb/descent rates alongside real-time Traffic Advisories (TA) and Resolution Advisories (RA).

This military/commercial high-reliability configuration operates from primary 115V AC (400 Hz) instrument bus power with dedicated 5V AC/DC panel backlighting. It incorporates front-panel UP/DN range switching (selectable 3 to 40 NM based on TCAS processor configuration) and instantaneous situational decluttering via standard ARINC 429 high-speed databuses and multi-format air data analog inputs.

Whether integrated into modern civil air transport, rotorcraft platforms, or shipboard maritime surveillance aircraft, the 066-01171-3706 configuration satisfies severe environmental qualifications (RTCA DO-160C and DO-178B Level B software compliance) to ensure uninterrupted vertical-rate calculation and threat depiction.

Model Details

• Manufacturer: Honeywell Aerospace / Bendix-King
• Model: IVA-81D TA/RA/VSI
• Manufacturer Part Number (MPN): 066-01171-3706
• Cross-Reference OEM P/N: 80-5181-13-6
• National Stock Number (NSN): 6610-01-433-2219
• CAGE Code: 22373 / 45934
• Bezel / Faceplate Finish: Aviation Non-Reflective Black
• Export Control: ECCN 9A610.x / 7A994 (Subject to Dual-Use / ITAR verification on export)

Technical Specifications

Key Features

1. Sunlight-Readable Full-Color AMLCD: Delivers sharp symbol rendering, wide viewing angles and high-contrast color delineation for TCAS threat symbology (cyan, white, amber, and red) without CRT burn-in or phosphor degradation.
2. Dynamic Resolution Advisory (RA) Arcs: Directly paints red “NO FLY” zones and green “FLY TO” vertical speed targets along the perimeter tape during critical conflict-avoidance maneuvers.
3. Versatile Air Data Ingestion: Natively decodes digital ARINC 429 high-speed/low-speed label streams, with internal provision for legacy analog synchro (ARINC 565, 26V AC reference) and DC voltage inputs
4. Front-Panel Operator Controls: Features integrated UP/DN range pushbuttons (3, 5, 10, 20, and 40 NM ranges), TA-SEL symbol declutter toggling, and manual rotary display brightness with ambient sensor photocell override.
5. Robust Fit-Form-Function Retrofit: Engineered as a direct mechanical and electrical upgrade for older IVA-81A series indicators via industry-standard M83723/75R2041N rear circular connector mating.

Supported Processors & Systems

• Honeywell / BendixKing: TPU-66A, TPU-67A, TPU-67B, CAS-67A, CAS-81, CAS-100 TCAS II Systems.
• Rockwell Collins: TTR-920, TTR-921, TTR-4000 series TCAS receivers/transmitters.
• Air Data Computers: Honeywell DADC, Collins ADC-80/85, Penny & Giles digital air data computers supporting ARINC 429 altitude rate label 212 or analog rate synchro.

Applications

• Primary Cockpit Climb/Descent Monitoring: Serves as the primary flight display indication of vertical speed for flight deck crewmembers (pilot and copilot stations).
• Collision Avoidance Warning & Maneuvering: Receives real-time collision track vectors from the TCAS directional antenna computer to visually issue preventative and corrective climb/descend advisories.
• Terminal Declutter Radar Navigation: Allows pilots operating within congested airspace to declutter targets via front-panel TA-SEL control, focusing purely on proximate vertical separation profiles.
• Extreme-Environment Maritime & High-Altitude Flight: Rated for continuous operation in unpressurized/pressurized compartments up to 55,000 feet, resistant to high-vibration maritime turboprop corridors.

Frequently Asked Questions

Can the Honeywell IVA-81D replace my existing IVA-81A display directly?

Yes. The IVA-81D was specifically designed as a form, fit, and functional replacement for the older IVA-81A CRT indicator. It mounts directly into the same standard 3 ATI cutout and utilizes the identical pinout scheme, completely eliminating CRT power supply maintenance and obsolescence issues.

What is the difference between part number 066-01171-3706 and other IVA-81D variants?

Part number 066-01171-3706 designates specific hardware and software pin-strap options:

1. 115V AC (400 Hz) primary operating power.
2. 5V AC/DC low-voltage incandescent/LED cockpit lighting rail.
3. Aviation Non-Reflective Black bezel.
4. Built-in front panel UP/DOWN NM range pushbuttons.

How do I clear an intermittent “TCAS FAIL” flag on the indicator?

A persistent or flashing “TCAS FAIL” flag typically indicates an interruption of incoming ARINC 429 digital words from the TCAS processor or air data system. Check pin seating on the rear connector, verify bus termination resistance (nominally 70 to 78 ohms between differential pairs), and verify that incoming air data source strapping matches the processor’s configuration.

Does this unit come with dual-pilot configuration compatibility?

Yes. For commercial and transport multi-crew operations requiring two independent TCAS indicators, the IVA-81D can be wired in tandem to the primary TCAS processor with independent display range selection and dedicated pilot/copilot lighting controls.