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ES-4029 – Aircraft Alternator 28Volt 70Amp
Available now on the Airparts.aero Marketplace.
Overview
The ES-4029 is a flight-critical, FAA-PMA approved 28-volt, 70-amp aircraft alternator, an essential power generation unit for a wide range of Continental-powered aircraft. This is not a generic alternator; it is a high-efficiency, belt-driven alternator engineered by industry leaders like Hartzell Engine Technologies to provide a powerful and reliable source of electrical energy. The ES-4029 is designed to meet the significant electrical demands of modern, IFR-equipped aircraft, reliably powering glass-panel avionics, autopilots, and anti-icing systems while simultaneously charging the battery.
As a direct replacement for the original Continental alternator, this unit is built to withstand the extreme vibration and temperature of the engine compartment. Its integrity is fundamental to the safety and reliability of the aircraft's entire electrical system.
Key Features
High-Capacity 70 Amp Output: Delivers a powerful 70 amps of continuous power at a regulated 28 VDC. This high capacity is essential for supporting the significant electrical loads of modern avionics suites and aircraft systems, ensuring a positive charge rate even at lower engine RPMs.
Belt-Driven Design: Utilizes a standard V-belt driven by a pulley on the engine's crankshaft. This design is common on many Continental engines and allows for straightforward installation and maintenance.
Integrated Cooling System: Features an integrated, high-efficiency cooling fan and a purpose-designed vented housing. This ensures proper airflow over the internal components (stator, rotor, and diodes), preventing overheating and ensuring long service life.
Modern Internal Components: Engineered with advanced stator and rotor windings and high-temperature insulation. This results in greater electrical efficiency (more amps per horsepower) and superior heat dissipation compared to older-generation alternators.
Direct PMA Replacement: A certified FAA-PMA direct replacement for the original Continental P/N 646843, guaranteeing perfect form, fit, and electrical function without any modification.
Technical Specifications
Part Number: ES-4029
Component Type: Engine-Driven Alternator
OEM Manufacturer (PMA): Hartzell Engine Technologies (Kelly Aerospace)
Voltage Output: 28 VDC
Current Output: 70 Amps
Drive Type: Belt-Driven
Cooling: Integrated Fan, External Ventilation
OEM Replacement for: Continental P/N 646843
Certification: FAA-PMA
Aircraft Compatibility
The ES-4029 is the specified PMA alternator for a vast fleet of popular high-performance single-engine aircraft powered by Continental engines. It is imperative to consult the specific aircraft's Illustrated Parts Catalog (IPC) or the current Hartzell application guide for final verification.
Common Continental Engine Series:
IO-520, TSIO-520
IO-550
Common Aircraft Platforms:
Beechcraft: Bonanza, Baron (certain models)
Cessna: 185, 206, 207, 210, 310
Mooney: M20 series
Why Choose ES-4029?
In a modern, IFR-equipped aircraft, the alternator is a no-fail component. A loss of generated power in instrument meteorological conditions (IMC) is a serious emergency. The Hartzell ES-4029 is a certified, high-reliability unit from a world leader in engine components. Its modern design provides more power at lower engine RPMs than many legacy alternators, ensuring a positive charge rate even during prolonged taxiing. For a system this critical to safety, a proven PMA part is a smart and reliable choice.
The Hartzell ES-4029 is a synchronous AC generator that produces three-phase alternating current. This AC output is then passed through an internal, solid-state rectifier bridge, which consists of six heavy-duty diodes. This bridge converts the three-phase AC power into smooth, usable direct current (DC) for the aircraft's 28-volt electrical bus. The alternator's output voltage is controlled by varying the small amount of DC current supplied to its rotor, known as the "field current." This is managed by the aircraft's separate voltage regulator, which senses the bus voltage and adjusts the field current as needed to maintain a constant output under all electrical load conditions. The belt-driven design provides a degree of mechanical isolation, as the belt can slip slightly under a severe load spike, offering some protection to the engine's crankshaft.
Note: This is a flight-critical component. Installation must be performed by a certified A&P mechanic. The drive belt must be correctly tensioned using a belt tension gauge to the value specified in the aircraft maintenance manual to prevent slippage and ensure proper power transmission. All electrical connections must be clean and torqued to the specified value.
