The DL439 Dual Tach is a precision-engineered dual RPM tachometer designed to monitor both engine speed (N2) and rotor speed (Nr) in turbine-powered helicopters and twin-engine aircraft. Built for reliability and clarity, this cockpit instrument plays a vital role in maintaining safe flight operations by allowing real-time synchronization of engine and rotor systems.
Precision Aviation Group offers full lifecycle support for the DL439 Dual Tachometer, including certified repair/overhaul, global inventory with immediate dispatch, bench calibration, and AOG service via its seven worldwide repair stations. These services extend to related tachometer variants (DL404‑109, 117‑94053‑03) as well as companion flight instruments often grouped in the same panel assemblies.
Part Number: DL439 Dual Tach
Features:
Function: Dual RPM monitoring (typically N2 and Nr)
Display: Dual-needle or dual-scale tachometer with clear, color-coded markings
Use Case: Suitable for rotorcraft and turbine twin-engine aircraft
Construction: Built for high-vibration, high-reliability environments
Mounting: Standard panel-mount instrument form factor
The DL439 Dual Tachometer is commonly used in:
Applications:
- Bell 206 / Bell 407 / MD Helicopters
- Turbine-powered helicopters and light twin turboprops
- Fleet MRO replacements and cockpit instrumentation upgrades
- Legacy aircraft undergoing modernization or instrument panel rebuilds
Here’s how Precision Aviation Group supports the DL439 Dual Tachometer and the related parts we commonly service and stock:
PAG Support:
- Certified Repair & Overhaul
- Exchange & Inventory Availability
- AOG / 24‑Hour Turnaround
Contact Us for Related Parts:
- 407‑375‑008‑101 – Dual Tachometer Indicator (OEM equivalent of DL439/DL439‑003‑003)
- DL404‑109 – Triple Tachometer Indicator
- 117‑94053‑03 – Triple Tachometer Indicator variant supported by PAG .
- 066‑3046‑07 – Navigation Indicator
- 060‑0015‑00 – Directional Gyro
- 5934D‑1A159 – Altimeter
- 403‑070‑263‑101 – Rotor/Data instruments (could vary per airframe)
