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622-9978-112 – Rockwell Collins EFIS-85/86 Electronic Flight Display (EFD)
Available now on the Airparts.aero Marketplace.
The 622-9978-112 is a core component of the Rockwell Collins EFIS-85/86 series, one of the most successful and reliable electronic flight instrument systems in the history of business and regional aviation. This 5-inch by 5-inch Electronic Flight Display (EFD) serves as the visual portal for the aircraft's primary flight data. Depending on its position and "strapping" in the cockpit, the -112 unit functions as an Electronic Attitude Director Indicator (EADI) or an Electronic Horizontal Situation Indicator (EHSI).
Engineered during the transition from analog "steam gauges" to integrated glass cockpits, the -112 variant is known for its high-intensity Cathode Ray Tube (CRT) technology, which provides a level of brightness and contrast required for high-altitude, sunlight-drenched flight decks. It is a high-reliability Line Replaceable Unit (LRU) designed to consolidate attitude, heading, and navigation data into a centralized scan, significantly reducing pilot fatigue during IFR operations.
Key Features
Multifunction Capability: Automatically reconfigures its display symbology based on the input from the Display Processing Unit (DPU), allowing it to serve as a primary horizon (EADI) or a navigation map (EHSI).
High-Resolution Symbology: Utilizes specialized "stroke" writing for sharp text and needles, overlaid on "raster" scanning for the blue/brown attitude background, ensuring maximum clarity for glideslope and localizer deviations.
Built-in Light Sensing: Features an integrated photocell that automatically adjusts the display brightness to compensate for changing ambient light, from direct noon-day sun to pitch-black night approaches.
Comprehensive Flagging System: Internal monitoring logic triggers highly visible warning "flags" (e.g., HDG, ATT, NAV) the moment data integrity is lost, preventing the pilot from following erroneous instruments.
Ruggedized Chassis: Built with an aluminum heat-sink frame to manage the thermal output of the high-voltage CRT components, ensuring long-term reliability in non-pressurized or high-cycle environments.
Technical Specifications
Part Number: 622-9978-112
Manufacturer: Rockwell Collins (Collins Aerospace)
Component Type: EFIS Electronic Flight Display (EFD)
Display Dimensions: 5" High x 5" Wide (Standard)
Input Interface: Composite Video / Deflection Signals from DPU-85
Operating Voltage: 28V DC / 115V AC (Airframe specific)
Weight: Approx. 8.2 lbs (3.72 kg)
Certification: TSO-C113 (Airborne Multipurpose Electronic Displays)
Aircraft Compatibility
Beechcraft King Air: 200, 300, 350 series (Standard Pro Line 2 fitment).
Cessna Citation: Citation II, V, and S/II.
Hawker: 800 and 1000 series.
Saab: 340A/B Regional Turboprops.
Fokker: 50/100 series.
Note: The 622-9978-112 is often interchangeable with other dash numbers depending on the specific Service Bulletin (SB) or Mod Status of your airframe. Consult AMM Section 31-60.
Applications
The 622-9978-112 is utilized for Primary Flight Navigation. Its primary roles include:
Primary Attitude Source: Displaying pitch, roll, and flight director commands.
Navigation Mapping: Displaying the EHSI map with weather radar (WXR) and TCAS traffic overlays.
System Redundancy: Providing a "reversionary" display path so the pilot can view critical flight data on the co-pilot's screen in the event of a failure.
Why Choose 622-9978-112?
Choosing the genuine Rockwell Collins 622-9978-112 ensures Inter-System Timing. In the EFIS-85 architecture, the display timing must be perfectly synchronized with the DPU-85 (Display Processing Unit). Non-OEM or improperly overhauled units can suffer from "image jitter" or "blooming," where the colors bleed into each other, making it difficult to read airspeeds or altitudes during high-vibration descent phases. The -112 unit is calibrated for specific Phosphor Persistence, ensuring that the "ghosting" effect is minimized during rapid aircraft maneuvers.
SEO-Enhanced Addendum
The 622-9978-112 operates on the principle of Raster/Stroke Hybrid Scanning. To maintain the sharpest possible symbology, the unit uses Vector (Stroke) Scanning to draw alphanumeric text and needles, while using Raster Scanning to fill in the blue sky and tan ground of the ADI. This requires a high-precision Deflection Yoke within the unit to move the electron beam with micro-second accuracy. The "High-Res" nature of the -112 variant is achieved by a fine-pitch Shadow Mask, which prevents color purity issues even when the aircraft is flying through high-intensity electromagnetic fields (e.g., near large radar installations).
Note: This is a flight-critical avionics unit. Installation must be performed by an FAA-certified Part 145 repair station. CRT-based displays contain high-voltage components; do not open the chassis. Prior to installation, ensure the aircraft cooling fans are operational, as inadequate airflow is the primary cause of EFIS display "burn-in" and failure. A full "Functional Flight Check" is required post-installation.
