Sandia LabNews

Cleared for takeoff


Airline safety center departs after 30 years

A group at the hangar dedication in 1993
BEHIND THE PANELS — At the hangar dedication in 1993, Dennis Roach, second from left, pointed out features of a Boeing 737 to, from left, Bruce Singer, then-Deputy Service Director of the Federal Aviation Administration Technical Center, then-Sandia president Al Narath, then-Albuquerque Mayor Louis Saavedra, then-Rep. Steve Schiff and then-Sen. Pete Domenici.

A 30-year program that made flying safer through continued innovations in airplane inspection, maintenance and airworthiness research has ended its tenure at Sandia.

The Federal Aviation Administration Airworthiness Assurance Center, or AANC, operated by Sandia for the FAA, is moving to the National Institute of Aviation Research at Wichita State University to combine with another long-standing FAA center. The planned move supports shifts in structure at both Sandia and the FAA.

At the AANC, Sandia researchers partnered with staff from aircraft manufacturers, airlines, regulatory agencies, universities and industry to develop inspection and maintenance systems for airplanes. The original focus was on developing nondestructive inspection techniques for aging airplanes and then grew to include airworthiness assurance needs throughout the lifetime of all aircraft systems. 

“Our goal was to develop the technology, prove the technology and, just as importantly, transfer the technology to industry to so it could be used routinely to ensure flight safety,” said Dennis Roach, Senior Scientist and Sandia’s lead engineer at the center. “The AANC at Sandia became a trusted source of unbiased technology development and validation for an array of programs.”

Mike Bode inspects the hub of an engine blade
SEEKING SMALL CRACKS IN ENGINE COMPONENTS — Mike Bode uses high-fidelity optics and phased array eddy current methods to inspect the hub of an engine blade for cracks in the dovetail assembly.

The center supported a wide range of airplane safety and reliability and new technology application concerns, including operations, structural repair, advanced materials, corrosion monitoring and control, human factors, engine and fuel systems, landing gear, mechanical and electrical systems, structural modeling and analysis, sensor and instrument development, crashworthiness, aircraft certification, information processing and analysis, accident investigation, regulatory and advisory oversight requirements, failure analysis and systems safety.

The center also collaborated with other industries and all branches of the military on multiple engineering system and reliability needs.

Dennis says the center staff adapted to and created many changes in the aviation industry. For example, the sole focus on metallic structures shifted into research in composite structures as the next generation of aircraft used these materials as their primary structure. Similarly, hand-deployed nondestructive inspection methods gave way to automated Structural Health Monitoring as the center led the way to the introduction of on-board sensors and use of smart structures to improve damage detection on aircraft.

Spin-offs, investigations and innovation

Dennis Roach with a Comparative Vacuum Monitoring device
EMBEDDED CRACK DETECTION — Dennis Roach with a Comparative Vacuum Monitoring device showing galleries etched into the sensor’s underside. The sensors can be mounted on aircraft structures wherever a flaw may be expected to form.

Some projects of note, including spin-off programs for other industries, include:

Accident investigations: The center supported accident investigations for TWA800, Swiss Air111, American Airline587 and several rotorcraft accidents. All programs resulted in the introduction of enhanced inspections methods for critical components.

Space shuttle program: After the Space shuttle Columbia accident, the center worked on NASA’s Return to Flight program to develop an inspection system to certify each Space shuttle before launch.

Syncrude/Exxon oil exploration: Composite expertise gained from aviation programs was used to produce new repair methods for high-cycle oil recovery equipment.

Monitoring bridge health: Expertise from the center’s airplane safety research was applied to monitor the health of bridges.

Robotic inspection of wind blades: The center’s expertise in nondestructive inspection was applied to develop a robotic inspection system to monitor the integrity of the blades on wind turbines.

Aircraft designs for tomorrow: In its work to deploy advanced aircraft maintenance technology and new materials, the AANC teamed with over 300 companies and government organizations and conducted Strategic Partnership Projects in ten countries.

‘Vast expertise’ at Sandia-AANC

Dennis Roach and Ken Harmon examine the inside of a Boeing 707
LOOKING FOR FATIGUE — Dennis Roach and Ken Harmon examine the inside of a Boeing 707 for long-term structural fatigue. Nondestructive techniques allow inspectors to assess the integrity of aircraft structures without disassembly.

“I never could have imagined back in 1990 that this program would end up spanning 30 years and contribute so much to commercial aviation safety,” said Dave Galella, FAA program manager. “It was incredibly comforting to know that whenever a new airworthiness challenge arose, I could pick up the phone and have access to the vast expertise that resided at the Sandia-AANC.”

During its time at Sandia, the center has received dozens of patents, won nine “Better Way” awards from the Airlines for America and FAA, produced more than 500 publications and formal procedures and helped develop regulatory measures to advance the aviation, aerospace, oil and gas, renewable energy, automotive and nuclear energy industries. The team worked on multiple international committees to produce worldwide standards for aircraft maintenance.

Researchers work inside the cabin of a B737 test bed
STRUCTURAL HEALTH MONITORING — Senior Scientist Dennis Roach, center, works inside the cabin of a B737 test bed, installing and acquiring data from Structural Health Monitoring sensors with Sandia mechanical engineers Stephen Neidigk, left, and Tom Rice.

“The AANC has been a highly successful collaboration offering the opportunity to develop new technologies for aviation assurance that further enabled structural health monitoring for our core NNSA physical security program and other programs,” said Sandia director Gary Laughlin. “Dennis Roach has been a central figure and leader both technically and programmatically in the program from its inception.”

All of the assets acquired during the program, including nondestructive inspection equipment, test specimens, custom tools, new inventions and an aviation document library were loaded into trucks in late April and transferred to a new hangar at Wichita State University. Most Sandia researchers working at the center have retired or transferred to other projects at Sandia, while Dennis says the transition lines up with his planned retirement and movement into aviation consulting.

Dennis estimates that more than 100 Sandia researchers contributed to projects at the center. The program brought in $120 million in funding over 30 years and led to an additional $30 million from industry partnerships.

A 737-200 aircraft at the AANC hangar
737 AIRCRAFT TESTBED — A 737-200 aircraft, circa 1968, which experienced 50,000 flight cycles in its lifetime and then served as a full-scale testbed for numerous inspection development programs at the AANC hangar facility that Sandia operated at the Albuquerque International Sunport.