Two Sigma Engineers working on an Aircraft

Aircraft MRO Services

Sigma Aerospace has built a reputation as the leader in Managed Aircraft Maintenance.

Whether a single aircraft or a fleet of aircraft, all work is quoted and you can be sure you will be kept fully informed through our first class service process.

We have both CASA Part145 and CAR30 approvals in addition to EASA Part 145 certification and DASA Part 145 Certification.

Diverse MRO Capabilities

The Sigma team have significant capability including Cessna, Piper, Beechcraft, Diamond, Cirrus, Cessna Citation, Eclipse jets, TPE331 and PT6 powered aircraft. This includes King Air, Cessna Conquest, PC-12 and TBM aircraft.

In addition to our Tamworth location, Sigma has a line maintenance base in Adelaide with Bombardier Dash-8 Q300 and Q400 aircraft capability.

Sigma Aerospace Placements

World-Class Reputation

Our world class reputation has allowed us to partner with the best. Sigma is an Authorised Service Centre for Eclipse Jets, Cirrus Aircraft, Honeywell Engines, Diamond Aircraft, Trig Avionics and
is a TCM, and Lycoming approved service centre.

We deliver on time and on budget and have significantly invested in all aspects of our aircraft maintenance facility to ensure we offer the customer the most efficient, stress free experience in the industry!

Australian Owned

Headquartered at Tamworth Airport, Sigma’s footprint is diverse with operations in Sydney, Brisbane, Gold Coast, Melbourne, Tamworth and Adelaide. Our portfolio companies include aircraft and component maintenance (MRO), engineering training, workforce solutions and new technology.

From your very first contact, Sigma will manage your entire maintenance requirements including airframe, engine, avionics, instruments and components, all managed in-house at Sigma.

Sigma is an Authorised Service Centre for
Continental Piston Engine


Sigma Aerospace has offered total engine maintenance and support for more than 40 years. From individual component overhaul through to complete fleet engine management. Our managed services include acquisition of customer core engines, stocking complete spare engines ready to be deployed, as well as exchange engine and component programs either individually or Power By The Hour (PBTH) Programs.

Sigma overhauls all Continental and Lycoming engines ranging from O-200 through to IO-720 engines. We have significant component overhaul capability including fuel components, starters, magneto’s, alternators and turbo chargers and controllers, and offers machining services including Cylinder Overhauls, Conrod and Crankcase Machining.

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Turbine engine face


Sigma’s turbine engine repair facility has been in continuous service for over 20 years and has a reputation as the most experienced turbine engine repair facility in Australia.

We are a Honeywell TPE331 Authorised Service Centre, supporting PT6A HSI, GBI and Overhaul, TPE 331, PT6A and PW100 Fuel Nozzle Repairs, and offer a Rental Engine Pool. Additionally Sigma services, repairs and overhauls components for the TPE331, including Gearbox inspections, Complete Engine Repair (CAM), Fuel nozzle maintenance, Corrosion treatment, Field maintenance, and Hot section inspections.

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Composite Repair


Sigma Aerospace has a dedicated composites and structures repair facility located on the Gold Coast specialising in the repair of a wide variety of fixed wing and rotary wing components in both Commercial and Defence sectors.

With CASA, EASA and DASA approvals Sigma has expertise repair for all composite and sheet metal aircraft structure and components including carbon fibre, Kevlar, fibreglass, honeycomb sandwich panels and aluminium sheetmetal repairs. We have a fully equipped facility incorporating state of the art technology including environmentally controlled preparation rooms, standalone paint facility, and fixed and mobile hot bond repair equipment.

We also have mobile repair capability and can manage complex structural repairs on wing for those parts of your aircraft that cannot be shipped.

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Sigma Avionics


Sigma specialise in installing, modifying, and repairing Avionics systems. From scheduled avionic maintenance of a single aircraft through to a fleet wide upgrade of avionics systems, Sigma has the capability to manage this in house or at your own location.

Our World class reputation has allowed us to complete major avionics upgrades on various aircraft including a fleet of corporate jets in long term contract, a fixed price ADSB upgrade of 18 turboprop aircraft (50 and 70 seat), as well as various upgrades to general aviation aircraft.



Sigma is unique in that it is the only company in Australia that calibrates both instruments and tooling and equipment, our clients include some of Australia’s largest airlines and specialise in the servicing, certification, and calibration of test and measurement instruments, and most avionics equipment, tooling, and instrumentation.

Sigma Instruments offer sales and service for a large range of aircraft and electrical components including Aircraft and engine instrument repair and overhauls, Gyroscopic, altimeter, turn co-ordinator, airspeed indicators, Pressure, temperature, torque, and flow indicator sales, repair, and overhauls, Electrical instrument and radio installations, inspection, and repair, and Avionics upgrade design and installation.

Sigma Instruments also conducts a wide variety of tooling and equipment calibration, and services a large range of aircraft and electrical components including Torque Wrenches, Pressure, Temperature, and Humidity Gauges and Regulators, Multimeters, Ohmmeters, Crimpers, Cable Tensiometers, and Precision measuring devices such as Micrometres and Vernier callipers.

Fuel Nozzle Repair


Sigma Aerospace can undertake Fuel nozzle overhaul, clean and test including PW100 Series engine fuel nozzles (including PW127), Pratt and Whitney PT6 fuel nozzles and flow dividers, and Honeywell TPE-331 series fuel nozzles.

Sigma holds numerous nozzle sets in stock for the operator to allow advance exchange, reducing the operators downtime and stock holdings, and we also have significant engine component repair capability including including fuel and turbo components such as Manifold valves, Controllers, Fuel pumps, Fuel limiter, wastegates, Turbos, Alternators and magnetos.

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Sigma Aerospace holds a vast variety of parts that are available to ship on the same day. If we don’t have the part we will track it down for you taking the stress out of you ordering parts.

We pride ourselves on assisting all customers with their parts enquiries. Our team are standing by to assist you in quoting on all your aircraft enquiries.