Avionics & Wiring
ATA Chapter 42 — N720AK Systems Reference
Overview
This section covers N720AK’s avionics stack as an integrated system — how everything is wired together, the panel layout, connector types, and the data flow between components. Individual avionics boxes are documented in their own system pages; this page covers the interconnections.
Avionics Stack
| System | Component | Notes |
|---|---|---|
| Audio Panel | Garmin GMA 245 | Bluetooth, 4-place intercom, S/N 3YL000434 |
| Nav/GPS/Com | Garmin GTN 650 | Certified IFR, single Bob Archer nav antenna, S/N 1Z8021616 |
| EFIS | Dynon Skyview HDX | Primary flight display |
| Autopilot | Dynon 3-axis | Roll, pitch, yaw damper servos |
| AP Panel | Dynon | Autopilot control panel |
| Com Panel | Dynon | Com frequency control |
| Knob Panels | Dynon | |
| CO Detector | CO Guardian 452-101-012 | Guardian Avionics |
| Transponder | ADS-B Out | |
| ELT | Artex ELT 345 | 406 MHz |
| Bus Manager | flyEFII System32 | See Electrical Power |
| Power Distribution | VPX Sport | See Electrical Power |
| Instrument Panel | Aerosport 310 | Aerosport Products |
| Overhead Console | Aerosport Carbon | Aerosport Products |
| Map Lights (x2) | MAPLIGHT-R-24 | SteinAir |
CO Guardian 452
Model: 452-101-012 (Certified Remote Mount CO Detector for Dynon Systems) S/N: 112081 Status: Not currently installed. The unit was replaced under RMA 11096 (Dec 2025). The Dynon EMS pin it previously occupied (pin 31, brown/blue wire) is now used by the Monkworkz MZ-30 generator proportional current output.
Wiring for future reinstallation:
- The brown/blue wire for the CO Guardian’s EFIS connection is tied up near the Dynon EMS connector
- Audio warning line runs from the CO detector location to the GMA 245 Music input (currently disconnected, difficult to reach behind panel)
- Dynon sensor definition file: CO Guardian Sensor Config (RevC) — already filed in GDrive Configs/Dynon
- Circuit breaker: 7277-2-2 (2A, 14/28 VDC Avionics)
- RS-232 interface available (optional)
References:
Software Versions
| System | Version | As Of | Update Source |
|---|---|---|---|
| Dynon Skyview HDX | 17.4 | 2026-03-06 | Dynon HDX Software Updates |
| Garmin GTN 650 | Main SW 6.73 | 2026-03-06 | Garmin GTN Software |
| flyEFII System32 | Version 86, Build 001 | 2026-03-06 | flyEFII |
| Dynon aviation database | Cycle 2602 (Feb 19 – Mar 18) | 2026-03-06 | Dynon US Aviation Data |
| Seattle Avionics ChartData | Current (all 50 states) | 2026-03-06 | Seattle Avionics |
Panel Layout
Data Flow
Known Wiring Notes
Serial 4 (Dynon ↔ GTN 650): The blue and green wires are intentionally flipped on this serial connection. This swap was done during installation — the TX/RX lines needed to be crossed for proper communication between the Dynon SkyView and GTN 650 on serial port 4.
Disconnected audio warning line: The old CO audio warning line runs from the former CO detector location to the GMA 245 Music input. This line is currently disconnected. It is difficult to reach — runs behind the panel.
Disconnected serial 4 line: A serial 4 cable was cut — it leads from one of the GTN 650’s serial outputs to the Dynon’s serial 4 port. Both connections are a major pain to reach and worth documenting on an updated schematic.
Wiring
Inspection & Maintenance
Connector References
- Delphi connectors: VAF thread — which Delphi connectors for RV-10
- Metri-Pack connectors: VAF thread — Metri-Pack connectors for engine sensor harness
EMS Sensors
Dynon EMS engine sensor inventory for N720AK:
| Function | Dynon P/N | Description | Qty | Notes |
|---|---|---|---|---|
| Fuel pressure | 105492-002 | 150 PSI fluid pressure (= Kavlico v2 103757-000) | 1 | Configured as KAV V2 150PSI DIFF mode; purple gasket removed |
| Oil pressure | 105492-002 | 150 PSI fluid pressure (= Kavlico v2 103757-000) | 1 | Purple gasket removed |
| MAP | 104781-000 | MAP sensor, 1/8“ hose, 0–60 inHg | 1 | Discontinued; replacement is 105493-000 (1/8-27 NPT). Automotive-style sender |
| Oil temperature | 100409-001 | Oil/coolant temp, 5/8-18 UNF | 1 | Lycoming/Continental/Superior compatible |
| CHT | 100404-000 | CHT, adjustable bayonet, 3/8-24 UNF | 6 | One per cylinder |
| EGT | 100405-000 | EGT, 1.00–2.25“ hose clamp | 6 | One per cylinder |
| Alternator amps | 100412-000 | Amps shunt, 0–60A | 1 | Primary alternator current sensing |
| Generator current | — | Monkworkz MZ-30 proportional output on EMS pin 31 | 1 | 0–2.7V = 0–30A; Dynon sensor: MONKWORKZ CURRENT (AMPS, name=MZ30) |
| Generator status | — | Monkworkz MZ-30 status wire on EMS pin | 1 | CONTACT-type sensor; Dynon sensor: MONKWORKZ STATUS (name=MZ30_S). Wire not yet physically connected |
MAP Blanking Threshold
The MAP sensor definition (100434-000, all calibration variants) uses a min_val parameter that blanks the reading below a threshold. This was lowered from 2.0 PSI (4.07 inHg) to 1.5 PSI (3.05 inHg) on 2026-03-17 to prevent MAP and fuel pressure (DIFF mode) from blanking at high altitude idle with constant-speed propeller. Change approved by Don Jones, Dynon Customer Support (Zendesk #186497, 2026-03-16).
EMS Wiring
The Dynon SkyView Installation Guide page 7-7 shows the EMS wiring diagram for engine sensor connections.
References
- Power & Lighting Schematic
- SkyView Interconnect Schematic
- VPX Pro/Sport Load Planning Worksheet
- Dynon SkyView Third-Party Device Connection (Rev E)
- CO Guardian 452 Installation Drawings (Rev G)
- CO Guardian Sensor Config (RevC) — Dynon sensor definition file
- Aerosport 310 Panel Installation
- Aerosport Overhead Console Installation
- Aerosport Switch Hole Dimensions
- Aerosport Switch Wiring Diagram