The PT6A-34: Engine Profile and Why It Dominates Its Market

The PT6A-34 produces 750 shaft horsepower, positioning it between the entry-level 680 shp PT6A-27/28 variants and the corporate/commuter-class PT6A-60A. This power class makes it the engine of choice for high-utility single-engine aircraft and light twin-engine platforms where additional power over the PT6A-27 provides meaningful performance gains without the weight and cost of moving to the mid-range class.

The variant has accumulated one of the largest installed fleet footprints in the PT6A family across three distinct market segments: agricultural spray aviation (where its combination of power, reliability, and maintainability has made it the industry standard), regional cargo operations using the Cessna 208B Caravan, and general aviation through the Piper Cheyenne II. This market breadth creates consistent secondary market supply and a robust overhaul infrastructure that serves operators worldwide.

PT6A-34 Airframe Applications

The PT6A-34 is approved for a wide range of certified aircraft. Primary applications include:

Aircraft	Role	Notes
Cessna 208B Super Cargomaster / Caravan	Cargo, utility, skydiving	Primary single-engine cargo and utility platform globally
Piper PA-31T2 Cheyenne II	Business twin	High-performance light twin; PT6A-34 provides climb performance advantage over smaller variants
Beechcraft King Air C90 (select configs)	Business twin	Some early C90 configurations; verify against TCDS and serial number
Agricultural spray platforms	Aerial application	Numerous certified airframes; PT6A-34 and PT6A-34AG variants depending on aircraft
Pilatus PC-6 Porter (select configs)	STOL utility	Specific PC-6 configurations; verify against TCDS

PT6A-34 vs PT6A-34AG: Understanding the Distinction

The PT6A-34AG is a specialized variant of the PT6A-34 configured specifically for aerial application (agricultural spray) aircraft. The AG designation indicates modifications to the engine that accommodate the unique operating demands of spray platforms, including provisions for inverted flight and adaptations to the fuel and oil systems to handle the corrosive chemical environments common in agricultural operations.

The PT6A-34 and PT6A-34AG are distinct Part Numbers and are not directly interchangeable in all applications. The correct variant is specified in the aircraft Type Certificate Data Sheet. Installing a PT6A-34 in an airframe that requires a PT6A-34AG — or vice versa — creates an airworthiness finding. UTP confirms the correct variant designation against the aircraft serial number before presenting any PT6A-34 sourcing options.

PT6A-34 in Agricultural Service: What Buyers Need to Know

The PT6A-34 is the most common turboprop engine in aerial application aviation. This creates a large secondary market supply from spray operators, but also requires additional due diligence that does not apply to cargo or business aviation acquisitions.

Agricultural PT6A-34 engines operate at consistently high power settings, often at or near maximum continuous power for extended periods. Low-altitude operation introduces dust, particulate matter, and chemical residue into the inlet. The corrosive nature of many agricultural chemicals accelerates degradation in the hot section, fuel system, and compressor over time. An agricultural PT6A-34 at 1,800 hours TSO may have hot section condition more consistent with a 2,400-hour utility-service engine.

For any PT6A-34 sourced from agricultural service, a current borescope inspection by an independent A&P mechanic is mandatory due diligence — not optional. The borescope provides direct visual assessment of hot section condition independent of TSO. UTP coordinates pre-purchase borescope inspections for agricultural-source PT6A-34 engines when requested, and does not present agricultural units to buyers without completing an adequate documentation review first.

How UTP Sources PT6A-34 Engines

The PT6A-34 is one of the most actively traded turboprop engine variants in the secondary market. UTP sources PT6A-34 engines through established relationships with cargo operators, agricultural aviation companies, aerial application MRO facilities, overhaul shops, and engine dealers across North America, South America, and Australia — the three largest markets for PT6A-34-powered aircraft.

For serviceable and overhauled PT6A-34 units, qualified options are typically identified within 5 to 15 business days. Run-out cores from agricultural operators are regularly available with shorter lead times due to the high throughput of scheduled overhaul events in the spray season cycle. AOG situations receive priority handling. Contact UTP with your required variant (PT6A-34 or PT6A-34AG), aircraft serial number, required condition, and timeline for current availability.

PT6A-34 Engine Condition Guide

New / Zero-Time

Factory-new PT6A-34 and PT6A-34AG engines are available on a limited basis as new surplus stock. OEM new production of the PT6A-34 has largely been supplanted by later variants in current-production aircraft, making new units increasingly scarce. New surplus units require storage records verification before installation. Highest acquisition cost and lowest near-term maintenance exposure.

Serviceable MID-TIME

Operated PT6A-34 engines with documented TSN and TSO remaining. For utility and cargo-service engines, mid-time units offer strong value. Agricultural-service mid-time engines require a current borescope inspection before purchase, regardless of documented hours. Value is determined by remaining TBO, logbook quality, AD compliance, and confirmed hot section condition.

Overhauled / Zero-Time Since Overhaul

PT6A-34 engines restored to serviceable or new-limits condition by an FAA-certificated repair station with PT6A ratings. The PT6A-34 is supported by a well-developed overhaul network due to its large installed base. A zero-time overhaul ships with a new FAA Form 8130-3. Confirm the overhaul facility holds current FAA repair station certification and specific PT6A-34 authorization. Mid-time overhauls targeting the hot section are common in agricultural operations and can deliver strong value at lower cost than full zero-time events.

Run-Out / Core

PT6A-34 cores are consistently available, particularly from agricultural operators approaching TBO during or after the spray season. Core value depends on variant (PT6A-34 vs PT6A-34AG), TSN/TSO, logbook completeness, and hot section condition. UTP accepts PT6A-34 and PT6A-34AG cores as trade-in toward serviceable or overhauled replacement units.

What Most PT6A-34 Buyers Get Wrong

The most common mistake in PT6A-34 transactions is treating TSO as a reliable proxy for condition when sourcing from agricultural operators. In utility or cargo service, an engine at 1,500 hours TSO typically has substantial hot section life remaining. In agricultural service operating at high power and in corrosive chemical environments, that same 1,500 hours TSO may represent a hot section that is at or near its serviceable limits. Buyers who evaluate agricultural PT6A-34 engines by TSO alone and skip the borescope routinely discover expensive hot section findings post-purchase.

The second common mistake is confusing PT6A-34 and PT6A-34AG availability. Buyers sourcing for agricultural airframes sometimes accept a PT6A-34 when the airframe requires a PT6A-34AG — or vice versa — because the variants look identical and the price is right. Confirming the correct variant designation against the TCDS before committing to a purchase takes five minutes and prevents an airworthiness finding that can ground the aircraft for weeks.

PT6A-34 Engine Buying Checklist

• Confirm correct variant designation — PT6A-34 or PT6A-34AG — against aircraft TCDS and serial number
• Verify complete and continuous logbook records with no missing entries
• Confirm full AD compliance record with no open airworthiness directives
• Request current borescope inspection report — mandatory for agricultural-service engines, strongly recommended for all
• Confirm overhaul facility holds the current FAA repair station certificate with PT6A-34 ratings
• Verify FAA Form 8130-3 is present, current, and matches the engine serial number
• For agricultural-source engines, inquire about operational history and chemical exposure — corrosion accelerates wear beyond what TSO reflects

PT6A-34 Engine Pricing: Market Overview

The PT6A-34 trades across a wide price range depending on condition class, whether the unit is from utility/cargo or agricultural service, and current secondary market supply. Agricultural-service units in equivalent condition typically price at a modest discount to cargo or utility-service engines, reflecting the additional due diligence and potential hot section exposure.

Market pricing as of Q2 2026. Prices vary by condition, service history, and current market availability.

Condition	Typical Price Range	Notes
Run-out / Core	$40,000 – $90,000	Agricultural cores may price lower depending on hot section condition
Serviceable Mid-Time	$100,000 – $200,000	Agricultural units: borescope required; discount vs utility-service at equivalent TSO
Overhauled / Zero-Time	$180,000 – $280,000	Full overhaul with hot section: at or near top of range
New / Factory New	Market on request	Increasingly scarce; storage verification required

Total cost of ownership — including the cost of a pre-purchase borescope, remaining TBO hours, and expected near-term maintenance — is a more reliable purchase metric than acquisition price alone. An agricultural PT6A-34 priced $30,000 below market may represent strong value or a significant liability, depending on what the borescope reveals.

How to Buy a PT6A-34 Engine from UTP

Start with a direct inquiry. Provide your aircraft make, model, and serial number, the required variant designation (PT6A-34 or PT6A-34AG), preferred condition, operational history preference, and timeline. UTP verifies the correct variant, initiates sourcing, and presents qualified options with full documentation details.

Support includes:

• Variant designation confirmation — PT6A-34 vs PT6A-34AG — against aircraft TCDS
• Documentation review on every option before presentation
• Coordination of pre-purchase borescope inspections for agricultural-source engines
• Core exchange valuation for PT6A-34 and PT6A-34AG run-out units
• AOG expedited handling for unplanned removals in spray season or cargo operations

All PT6A-34 engines ship with complete logbook copies, current FAA Form 8130-3 airworthiness documentation, and an AD compliance summary. Export documentation and EASA Form 1 equivalency paperwork available for international buyers.

Frequently Asked Questions—PT6A-34 Engines for Sale