Headset Jack Ring-Out Tool — Helicopter Single-Point (U-174/U) Multimeter Adapter (4-Position, Dongle Style)

Got a mystery mic or phones dropout? Before you start pulling trim, plug this electrical troubleshooting dongle into the U-174/U jack and let your meter tell you what’s alive and what’s not. Quick checks up front can help you avoid tearing out interior just to test.

What it is

• Dongle w/ integrated U-174/U plug: Short, flexible lead with a rugged single plug at the end—easy to seat in tight panels, easy on the jack.
• 4-position selector switch: Step through the four core conductors—Phones Hi, Phones Return, Mic Hi, Mic Return—one at a time for clean, isolated continuity checks.
• Multimeter-ready: Single 4 mm banana port sized for Whiskey Victor Tools meter leads. Set your MM to continuity/ohms and start beeping.
• Compact & labeled: Lives in the top drawer; clear legends so you don’t test the same line twice.

Why you’ll like it

• Targeted electrical checks: Verify the four essentials at the jack before you chase wiring down the cabin.
• Find the fault fast: Jack? Line? Splice? Narrow it down in minutes.
• Shop-floor simple: Beep = good. No beep = problem. That’s the whole plot.

Quick start — ring-out in minutes

1. Master OFF. (We’re testing continuity, not throwing a party.)
2. Plug it in: Seat the U-174/U fully.
3. Hook up your meter: Lead into the 4 mm banana; set to continuity/ohms.
4. Find your audio panel: Locate the other end of the wire and adapt using Walts Avionics D-Sub adapters and long reach tool.
5. Click the switch: Each position isolates one conductor—confirm phones and mic lines plus returns.
6. Log it & fix it: Beep good? Move on. No beep? You just found your next direction.

Compatibility

• Fits standard helicopter single-plug jacks (U-174/U).
• Not for GA dual-plug (PJ-055/PJ-068) or LEMO 6-pin without an adapter. Need those? Check our store.

Warnings & shop wisdom

• Power OFF while testing.
• Continuity/ohms only: No megger or high-voltage tests.
• Meter discipline: Fresh leads, firm contact, honest results.
• Aircraft work: Follow OEM/FAA procedures. You’re the one signing.

Warranty & liability

• 60-day defect coverage: We’ll repair, replace, or refund within 60 days of purchase
• Liability: You own the results. Whiskey Victor Tools isn’t liable for injury, property damage, lost time/profits, or any indirect/special stuff. (We make tools, not promises.)

Trademark notice

• U-174/U is a connector designation. No affiliation or endorsement is implied.