MRO & Manufacturing
CD Aviation Services Acquires STC for Twin Commander Engine Upgrade
CD Aviation Services acquires STC SA1024SO to authorize Honeywell TPE331-5-252K engine upgrades on Twin Commander 690 series, improving maintenance support.

CD Aviation Services (CDAS), a specialized turbine engine maintenance provider, has officially announced the acquisition of Supplemental Type Certificate (STC) SA1024SO. According to the company’s press release, this certification authorizes the installation of Honeywell TPE331-5-252K engines on the Twin Commander 690, 690A, and 690B Commercial-Aircraft series. The STC, previously associated with Aero Air, LLC, provides a Federal Aviation Administration (FAA)-approved pathway for operators to upgrade their legacy powerplants.
For the legacy aviation community, this acquisition represents a critical development in maintaining the airworthiness of aging fleets. The core of the upgrade involves transitioning the aircraft’s fuel control system from the older Bendix configuration to the more widely supported Woodward system. By bringing this STC in-house, CDAS aims to directly support Twin Commander operators facing growing industry concerns over parts availability and maintenance bottlenecks.
As out-of-production aircraft continue to age, the availability of approved modifications is vital for their continued operation. The official announcement highlights that this STC not only modernizes the engine configuration but also aligns the aircraft with current industry maintenance standards, ensuring these vintage twin-turboprops remain viable for years to come.
Technical Details of the Engine Upgrade
Transitioning from Bendix to Woodward Fuel Systems
The primary technical shift facilitated by STC SA1024SO is the conversion from the Honeywell TPE331-5-251K engine to the TPE331-5-252K engine. According to the provided research data, the most significant change in this upgrade is the replacement of the legacy Bendix Fuel Control Unit (FCU) with a Woodward FCU. The conversion is performed in strict accordance with Honeywell Service Bulletin SB 72-0216, which outlines the necessary steps for transitioning between the two fuel control systems.
Understanding the differences between these two systems is essential to grasping the value of the STC. The legacy Bendix system, found on early TPE331-5 engines, was largely air-based. Historical maintenance data indicates that these units were prone to operational issues, such as moisture freezing within the system. Today, Bendix-equipped engines represent a minority in the active fleet, and operators face severe challenges due to decreasing parts availability and limited overhaul support.
Conversely, the Woodward FCU is a predominantly hydraulic system that has become the industry standard for these engines. While the Woodward system has faced its own historical airworthiness directives, such as AD 2006-15-08, which required a switch from steel to plastic fuel splines to prevent runaway engines, it is vastly more serviceable within the modern aviation maintenance network. Furthermore, upgrading to the Woodward system is a prerequisite for further engine enhancements, such as the -10 upgrade.
Impact on the Twin Commander Fleet
Extending the Lifespan of Legacy Aircraft
The Twin Commander 690 series consists of twin-turboprop executive business aircraft built primarily between 1972 and 1979. Known for their high-wing design, impressive climb rates, and cruise speeds of up to 250+ knots, these aircraft remain popular in the used market. Because the airframes have been out of production for decades, maintaining and upgrading their powerplants is critical for their continued airworthiness.
The acquisition of this STC by CDAS offers tangible benefits to operators of these vintage aircraft. By providing a legal and practical method to replace obsolete Bendix systems, the STC effectively extends the operational lifecycle of the Twin Commander 690 series. Operators will no longer have to hunt for scarce Bendix components, as the -252K configuration offers much broader parts availability across the global supply chain.
Additionally, the Woodward system is widely understood across the global maintenance network. This familiarity leads to expanded overhaul capabilities and potentially lower maintenance downtimes for operators, ensuring that these legacy aircraft can be serviced efficiently by authorized repair stations worldwide.
“This STC provides operators with a clear and practical path forward when evaluating engine upgrades or addressing long-term support concerns. Our focus is on delivering solutions that improve aircraft reliability, maintainability, and overall lifecycle support.”
About CD Aviation Services
Headquartered in Joplin, Missouri, CD Aviation Services has specialized in small turbine engine maintenance for over 20 years. According to company statements, they operate as a Honeywell Authorized Part 145 repair station, focusing specifically on Honeywell TPE331 and TFE731 engines, as well as GTCP36 series Auxiliary Power Units (APUs).
The strategic acquisition of STC SA1024SO expands the company’s in-house capabilities, allowing them to directly support Twin Commander operators rather than relying on third-party certificate holders. This move solidifies their position as a dedicated support hub for legacy Honeywell turbine engines.
AirPro News analysis
We view the acquisition of STC SA1024SO by CD Aviation Services as indicative of a broader trend within the aviation maintenance, repair, and overhaul (MRO) sector. As original equipment manufacturers (OEMs) naturally shift their focus toward newer platforms, specialized MROs are stepping in to acquire the intellectual property and certifications necessary to keep legacy fleets airborne. By taking ownership of this STC, CDAS is not merely offering a repair service; they are actively solving a critical Supply-Chain bottleneck regarding the obsolete Bendix FCU. This proactive approach is essential for the survival of out-of-production airframes like the Twin Commander 690, ensuring that operators have a predictable, FAA-approved path for modernization and continued Compliance.
Frequently Asked Questions (FAQ)
What aircraft does STC SA1024SO apply to?
According to the FAA-approved certificate details, the STC applies specifically to the Twin Commander 690, 690A, and 690B series aircraft.
What is the main difference between the Bendix and Woodward FCU?
The legacy Bendix Fuel Control Unit is an older, air-based system that suffers from parts scarcity and historical reliability issues (such as moisture freezing). The Woodward FCU is a newer, hydraulic-based system that serves as the current industry standard, offering better parts availability and broader maintenance support.
Why is this STC important for Twin Commander operators?
It provides a legal, FAA-approved method to upgrade from the TPE331-5-251K engine to the -252K configuration, allowing operators to abandon the obsolete Bendix fuel system in favor of the supportable Woodward system, thereby extending the aircraft’s operational lifespan.
Sources
Photo Credit: CD Aviation Services
MRO & Manufacturing
JCB Aero Achieves Full MRO Capacity in Auch Facility Early 2026
JCB Aero’s Auch hangar reaches full capacity in early 2026, servicing three Airbus Corporate Jets with heavy maintenance and bespoke repairs.

JCB Aero Reports Full MRO Capacity in Early 2026
This article is based on an official press release from AMAC Aerospace.
JCB Aero, a French aviation service provider and subsidiary of AMAC Aerospace, has reported a highly successful start to 2026 for its Maintenance, Repair, and Overhaul (MRO) division. According to a May 15, 2026, press release from the company, its 5,000-square-meter hangar in Auch, France, is currently operating at full capacity.
The facility, which officially launched its MRO capabilities in October 2024, currently has all three of its aircraft slots occupied by Airbus Corporate Jets (ACJ). This surge in activity underscores the rapid market penetration JCB Aero has achieved since expanding beyond its traditional cabin interior services to offer comprehensive heavy maintenance.
Full Capacity at the Auch Facility
The recent press release details three concurrent Airbus projects currently being managed by the JCB Aero team. The hangar, designed to accommodate up to three single-aisle aircraft simultaneously, is fully utilized by a mix of scheduled inspections and bespoke modifications.
Specific Aircraft Projects
The first aircraft in the hangar is an Airbus ACJ 318, which recently underwent a C2 maintenance check alongside minor modifications. Company officials noted that specific tasks for this aircraft included the removal of skillets and a toaster, as well as the repainting of the aircraft’s registration number.
Additionally, two Airbus ACJ 319 aircraft arrived at the Auch facility for scheduled maintenance. The first ACJ 319 is undergoing 6-month and 18-month maintenance inspections. The second ACJ 319 required 6-month and 12-month inspections, along with the installation of new main wheel tires. Notably, the second ACJ 319 arrived with a broken cabin door, which JCB Aero’s in-house cabinet shop successfully repaired in just one week, according to the company’s statement.
Strategic Growth and In-House Capabilities
JCB Aero was originally founded in 1987, building a strong reputation as a French leader in the luxury design and manufacturing of civil, VIP, and helicopter cabins. Following its acquisition by the Swiss-based AMAC Aerospace Group in May 2016, the company strategically expanded into MRO operations. By October 2025, marking its one-year anniversary of receiving Part 145 MRO approval, JCB Aero had already completed over 20 maintenance projects.
Leadership Perspective
The company attributes this rapid growth to customer trust and operational efficiency. Sébastien Kubler, Chief Operating Officer at JCB Aero, highlighted this momentum in the recent press release:
“We are proud to see such a remarkable number of prestigious aircraft passing through our facilities. It reflects the trust our customers place in our teams and capabilities. Our objective is clear: to maintain this momentum and continue delivering the highest standards of quality and service in the months ahead.”
AirPro News analysis
We observe that JCB Aero’s ability to repair an ACJ 319 cabin door in just one week highlights a distinct competitive advantage in the VIP aviation sector. Because the company originated as a bespoke cabin interior and cabinetry specialist, it can seamlessly blend heavy mechanical maintenance with high-end interior repairs without the need to outsource, significantly reducing downtime for operators. Furthermore, the facility’s strategic location in Auch, in close proximity to Toulouse, the European hub of Airbus manufacturing, provides a significant logistical edge for sourcing parts, recruiting specialized engineering talent, and attracting regional Airbus operators.
Frequently Asked Questions (FAQ)
What aircraft can JCB Aero accommodate?
According to company specifications, the 5,000-square-meter hangar in Auch can accommodate up to three single-aisle aircraft simultaneously, such as the Airbus A320 family or Boeing 737 series.
When did JCB Aero launch its MRO division?
The company officially expanded into MRO operations in October 2024, receiving its Part 145 MRO approval after operating primarily as a cabin interior specialist since 1987.
Sources
Photo Credit: AMAC Aerospace
MRO & Manufacturing
SIAEC Launches Major Base Maintenance Facility in Subang Malaysia
SIA Engineering Company opens a new 590,000 sq ft base maintenance facility in Subang, Malaysia, expanding its regional MRO capabilities for widebody and narrowbody aircraft.

This article is based on an official press release from SIA Engineering Company Limited (SIAEC), with supplementary financial and market context summarized from reporting by Aviation Week, The Edge Singapore, and The Smart Investor.
SIAEC Opens Major Base Maintenance Facility in Subang, Malaysia
On May 22, 2026, Singapore-based SIA Engineering Company Limited (SIAEC) officially inaugurated Base Maintenance Malaysia Sdn. Bhd. (BMM), a wholly-owned base maintenance facility located at Sultan Abdul Aziz Shah Airport in Subang, Malaysia. According to the company’s official press release, the new site significantly expands SIAEC’s regional Maintenance, Repair, and Overhaul (MRO) network, supplementing its existing hangar operations in Singapore and the Philippines.
The opening of the Subang facility highlights a strategic push by SIAEC to achieve geographical expansion amid surging global demand for aircraft maintenance. By establishing a major footprint in neighboring Malaysia, the company aims to offer its Airlines customers greater flexibility while tapping into a growing local aerospace ecosystem.
The inauguration ceremony was officiated by Yang Berhormat Tuan Sim Tze Tzin, Malaysia’s Deputy Minister of Investment, Trade and Industry, underscoring the project’s importance to the Malaysian government’s broader aerospace ambitions.
Facility Capabilities and Operational Milestones
Expanding Regional MRO Capacity
According to reporting by Aviation Week and the official SIAEC press release, the new BMM facility spans 590,000 square feet. The site features two maintenance hangars designed to accommodate up to six concurrent aircraft checks. This capacity injection is critical for SIAEC as it navigates a constrained operational footprint in its home base of Singapore.
The Subang facility is equipped to provide scheduled heavy maintenance checks, such as comprehensive C-checks, alongside structural repairs, modifications, and retrofits. The company stated that the hangars support both widebody and narrowbody aircraft, specifically noting capabilities for next-generation models including the Airbus A350, Boeing 777, and Boeing 787.
While the official opening took place in May 2026, BMM has already achieved significant operational milestones. The press release notes that the facility obtained regulatory approvals for its first hangar late last year and successfully completed its inaugural aircraft check, a C-check for a Singapore Airlines Airbus A350-900, in November 2025.
“Today marks an important milestone for BMM. We are grateful for the support of the Government of Malaysia, the Selangor State Government, our regulators, customers, partners and employees. BMM is committed to building a trusted and competitive base maintenance hub within the SIAEC Group.”
Strategic Significance and Market Context
Deepening the Malaysian Footprint
SIAEC leadership cited Malaysia’s strong aviation heritage, strategic geographic location, established infrastructure, and growing pool of skilled aerospace talent as primary drivers for the investment. The BMM facility is not SIAEC’s first venture into the Malaysian market. According to the company, it already holds stakes in three other joint ventures within the country: Asia Pacific Aircraft Component Services, Eaton Aero Services, and Pos Aviation Engineering Services.
“BMM is a strategic investment for SIAEC to drive sustainable long-term growth… We see strong potential in Malaysia’s aerospace sector, particularly in talent development, technical capability and long-term industry growth.”
Balancing Growth with Expansion Costs
SIAEC has benefited from a strong post-pandemic aviation recovery. According to financial data reported by The Smart Investor in late 2025, the company saw a 26.5 percent year-over-year turnover increase to S$729 million in the first half of FY25/26, with profit after tax rising over 21 percent to S$83.3 million. The company recently reported higher overall earnings for the full FY2026.
Despite these strong earnings, market analysts have expressed near-term caution. Reporting by The Edge Singapore indicates that analysts have recently trimmed SIAEC’s target stock prices due to gestation costs associated with expansion projects like the Subang facility, as well as potential macroeconomic slowdowns linked to geopolitical tensions.
However, industry experts maintain that the company’s long-term strategy is sound. In a May 2026 research note, OCBC Group Research analyst Ada Lim highlighted the importance of these physical expansions.
“We think SIAEC’s long-term growth trajectory remains intact, supported by capacity and geographical expansion.”
AirPro News analysis
We observe that the opening of the Subang facility is a textbook example of the “spillover” strategy currently dominating the Southeast Asian aviation market. Severe land and labor constraints in Singapore are actively pushing aviation giants like SIAEC to build heavy maintenance capacity in neighboring countries. Malaysia, and specifically the Sultan Abdul Aziz Shah Airport in Subang, is rapidly becoming a major beneficiary of this trend.
Furthermore, to combat these geographical and labor constraints, SIAEC has been heavily investing in artificial intelligence, robotics, and Automation across its network. The integration of these technologies at new facilities like BMM will likely be a key differentiator as the company seeks to balance aggressive physical expansion with the near-term operational costs flagged by market analysts.
Frequently Asked Questions
Where is the new SIAEC base maintenance facility located?
The new facility, operated by Base Maintenance Malaysia Sdn. Bhd. (BMM), is located at Sultan Abdul Aziz Shah Airport in Subang, Selangor, Malaysia.
What types of aircraft can the Subang facility service?
According to SIAEC, the facility can handle both widebody and narrowbody aircraft, including next-generation models such as the Airbus A350, Boeing 777, and Boeing 787.
Sources
Photo Credit: SIAEC
MRO & Manufacturing
Chemical Leak Emergency at GKN Aerospace in Garden Grove California
A hazardous methyl methacrylate leak at GKN Aerospace in Garden Grove, CA, has led to mass evacuations and emergency response efforts.

This article summarizes reporting by KTLA.
A critical hazardous materials emergency is currently underway in Orange County, California. In the city of Garden Grove, a massive industrial storage tank holding highly volatile compounds has suffered a severe leak, prompting widespread alarm. Thousands of local residents have been forced to evacuate their homes as emergency response crews work desperately to prevent a catastrophic chemical spill or explosion at a local aerospace manufacturing plant.
According to reporting by KTLA, the incident began on the afternoon of Thursday, May 21, 2026, when a 34,000-gallon tank containing methyl methacrylate began to overheat uncontrollably. After a brief period Thursday night where authorities believed the cooling efforts were successful, conditions rapidly deteriorated by Friday morning. This sudden escalation forced officials to reissue and significantly expand mandatory evacuation orders across multiple neighboring cities.
We are closely monitoring this dual-hazard threat, which poses severe risks of both high flammability and respiratory toxicity. Local fire departments and federal disaster officials are currently coordinating emergency containment strategies as the structural integrity of the tank remains critically unstable.
Escalating Crisis at GKN Aerospace
Timeline of the Chemical Leak
The emergency originated at the GKN Aerospace plant located on the 12000 block of Western Avenue in Garden Grove. The facility is known for manufacturing specialized plastic components utilized in commercial and military aircraft. Based on KTLA’s timeline of events, the Orange County Fire Authority (OCFA) first responded to reports of a chemical leak at approximately 3:30 p.m. on Thursday.
The chemical inside the industrial tank began generating its own heat, a reaction that triggered the facility’s automatic sprinkler systems and relief valves. This safety mechanism subsequently released toxic vapors into the surrounding air. Firefighters spent the entirety of Thursday night continuously spraying the compromised tank with water to lower its internal temperature. While these initial cooling efforts led authorities to temporarily lift the first wave of evacuation orders, the relief was short-lived. By Friday, the tank’s temperature spiked once again, forcing hazmat crews to declare the vessel unmitigable and actively in crisis.
The Threat of Thermal Runaway
The primary concern for emergency responders centers on the estimated 6,000 to 7,000 gallons of methyl methacrylate currently trapped inside the 34,000-gallon tank. Methyl methacrylate is an industrial epoxy heavily utilized in aerospace manufacturing; however, it poses severe respiratory risks to humans and is highly flammable.
Because the substance is self-heating, an uncontrolled rise in internal temperature can lead to a dangerous chemical phenomenon known as thermal runaway. OCFA Division Chief and Incident Commander Craig Covey outlined the grim possibilities facing emergency responders on the ground.
“One, the tank fails and spills… or two, the tank goes into a thermal runaway and blows up,” Covey stated, according to KTLA.
Authorities noted that an explosion could trigger a chain reaction, potentially compromising adjacent storage tanks containing additional fuels and hazardous chemicals.
Community Impact and Evacuation Zones
Expanded Safety Perimeters
The renewed threat of an explosion on Friday necessitated a massive expansion of the evacuation zone, creating a roughly one-mile buffer that impacts thousands of residents across Garden Grove, Cypress, and Stanton. As detailed by KTLA, the mandatory evacuation perimeter is strictly bordered by Trask Avenue to the north, Ball Road to the south, Valley View Street to the east, and Dale Street to the west.
Displaced residents are being directed to emergency shelters established by local authorities. Evacuation centers are currently operational at the Garden Grove Sports and Recreation Center on Deodara Drive and the Cypress Community Center on Orange Avenue.
Widespread School Closures
The environmental hazard has severely disrupted local education and community activities. The Garden Grove Unified School District suspended classes indefinitely for numerous campuses situated within and near the danger zone to protect students from potential toxic plume exposure.
Affected schools include Pacifica and Rancho Alamitos High Schools, Bell and Alamitos Intermediate Schools, and several elementary campuses such as Barker, Bryant, Carver, Enders, Garden Park, Wakeham, and Patton. Furthermore, schools situated outside the immediate evacuation area have canceled all outdoor activities as a strict precautionary measure.
Government Response and Next Steps
The severity of the chemical leak has drawn the immediate attention of federal lawmakers. U.S. Representative Derek Tran, whose congressional district encompasses the affected Orange County area, announced that his office is actively coordinating with local police, fire, and emergency personnel.
Tran noted he is “in contact with federal disaster relief officials, including FEMA and the EPA,” to secure necessary assistance for the region.
While the immediate operational focus remains entirely on cooling the tank to avert a catastrophic explosion, future investigations will be required. Once the site is stabilized, authorities will need to determine the root cause of the initial overheating and the subsequent failure of the containment systems at the GKN Aerospace site.
AirPro News analysis
The unfolding situation in Garden Grove highlights the inherent risks associated with aerospace manufacturing facilities located in densely populated urban corridors. Methyl methacrylate is a critical component in producing lightweight, durable plastics for modern commercial and military aircraft, but its volatile, self-heating nature requires stringent, fail-proof thermal management protocols.
We anticipate that once the immediate threat is neutralized, regulatory bodies such as the Environmental Protection Agency (EPA) and the Occupational Safety and Health Administration (OSHA) will launch comprehensive investigations into GKN Aerospace’s chemical storage practices. This incident is likely to prompt a broader aviation industry review of how self-heating aerospace chemicals are stored, particularly regarding the redundancy of cooling systems and relief valves in aging industrial tanks.
Frequently Asked Questions (FAQ)
What chemical is leaking in Garden Grove?
The leaking substance is methyl methacrylate (MMA), a highly flammable and toxic industrial chemical primarily used in the manufacturing of aerospace plastics and acrylics.
Where are the evacuation centers located?
Shelters for displaced residents are open at the Garden Grove Sports and Recreation Center (13641 Deodara Dr.) and the Cypress Community Center (5700 Orange Ave.).
What is a thermal runaway?
Thermal runaway occurs when a self-heating chemical’s internal temperature rises uncontrollably. If cooling systems fail to mitigate the heat, the reaction accelerates, potentially leading to a catastrophic explosion.
Sources
Photo Credit: KTLA
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