Heli AH-64 Master Caution & Warning Annunciators
Introducing the Heli AH-64 Master Caution & Warning Annunciators, engineered to replicate the authentic look and feel of the AH-64 Apache cockpit. This two-piece set includes:
- Master Warn Annunciator: Illuminates in vibrant yellow at 2.0v
- Master Caution Annunciator: Glows in distinctive green at 3.0v
Each unit features a press function for added interactivity and is housed in an adjustable external cage to accommodate various panel thicknesses. Choose between Fully Built or DIY Assemble options to suit your build style and customisation needs.
Authenticity Meets Engineering Excellence
Designed using real-world dimensions, the lenses match the exact size of genuine 433 Boeing Korry units, delivering unmatched realism. The outer casing is crafted from high-quality resin, intentionally dimensionally larger than metal counterparts to account for material differences.
V2 Annunciators: Karl’s Engineering Pinnacle
Upgraded from the original V1 design, the V2 units feature:
- Soft-press ALPS buttons with enhanced push force and longer travel
- Integrated SMD components, including two ultra-bright SMD LEDs
- Built-in 5v resistors for true plug-and-play Arduino compatibility
No external resistors needed, just connect to the Arduino and go.
Smart Connectivity & Flexible Integration
Each annunciator is configured as a common Ground/Cathode unit with three dedicated pins:
- GND
- LED
- BUT (button/switch, configurable via Mobiflight/similar for acknowledgement or cancel functions)
This streamlined setup ensures easy installation and versatile integration across cockpit builds.
Striking Visual Impact
Outfitted with white LEDs, colored acrylic lenses, and a diffuser lens, these annunciators deliver a crisp, even glow that “pops” in any lighting condition. Whether used individually or with mixed lens colors, they elevate the visual fidelity of your cockpit environment.
Heli AH-64 Master Caution & Warning Annunciators
No Build guide Link - unit is prebuilt
WD link can be found here at Step 0: https://www.737diysim.com/build-guides-1/737ss-master-caution-%26-fire-warning-korry
































