At Lawson Aerospace, we support major and minor repair or alteration projects that require a Return to Service with FAA approved data for Normal and Transport Category Airplanes and Rotorcraft that show compliance with the Code of Federal (Aviation) Regulations 21, 23, 25, 26, 27, 29, 31 and CAR 3, 4b, 6, 7.

Damage tolerance (crack growth) analysis reports with a Supplemental ICA calling out mandatory NDT inspection intervals for transport category airplanes per 14 CFR 25.571 and an FAA form 8110-3 approving the data are prepared for the installation of antennas or sensors to fatigue critical baseline structure (FCBS), such as the pressurized fuselage skin, or repairs to the fuselage skin, frames, doors, wings, empennage, flight control surfaces.

Structural and fatigue analysis reports with repair or installation instructions, and an FAA form 8110-3 approving the data are prepared for antenna or sensor installations, the extension of repair limits beyond the manufacturer’s Structural Repair Manual or AC 43-13, or typical metallic or composite repairs, such as cracked frame repairs with doubler angles, or fuselage or wing skin corrosion blend out repairs with a doubler, or fatigue critical life-limited metallic or composite main and tail rotor blade repairs.

Engineering Orders with repair instructions and a structural and fatigue analysis are provided for minor repairs and alterations not covered by the manufacturer’s service documents, such as minor fuselage skin or spar chord or rotor blade blend out repairs that do not require a doubler, bonded duct repairs, or weld repairs to aluminum, steel, and titanium brackets and ducts.

Structural analysis reports and drawing/sketches are prepared to substantiate major repairs, or major alterations to modify or to install equipment on US designed or US civil registered, restricted category, public-use (commercial derivative), and US military airplanes and rotorcraft. The static strength of aircraft components and installations are analyzed by obtaining internal loads through free-body, shear and bending moment diagrams or numerical methods (FEA), and then performing structural analysis using classical handbook solutions. High cycle fatigue due to flight, acoustic, and random vibration loads are analyzed using stress-life methods.

Advanced composite sandwich and solid laminate panels are analyzed using classical laminated plate theory for ply-level tension and compression failure modes, core shear and compression, insert pull out, edge band (bearing), and non-linear adhesive shear and tension (bond) strength.

My two full time engineers and I support airline over-night and gate-hold maintenance with temporary repairs (time limited allowable damage), and heavy maintenance (major and minor repairs) on CRJ-200/700/900, DHC-8-400, and Embraer EMB-190 regional airliners. We supported depot level repairs to the entire US Navy fleet of TH-57 (Bell 206B3) helicopters for several years. We support major and minor bonded repairs to main and tail rotor blades.

We support major and minor repairs, and alterations, such as the installation of aeromedical equipment, equipment racks, seats/divans, Iridium/GPS/XM/Glonass/TCAS/TAS/SatCom antennas, FLIR cameras, LIDAR pods, digital cameras, and special mission equipment on US civil registered, and public-use aircraft, such as: Bombardier CRJ-200/700/900, DHC-8 series, Boeing 737, 747, 757, 767, MD-11, Airbus A320 series, Saab 340B, Embraer EMB-170/190, Lockheed L-100 (382), C-130H, Gulfstream G-1159, G-V, Dassault FalconJet 50, 900, 2000, Learjet 31, 35/36, 45, 55, 60, Cessna Citation 500-680, Fairchild Swearingen SA-227, KingAir 200, 300, 350, Cessna 100-400 series, PA-28, PA-42, Pilatus PC-12/45, Eclipse EA-500, Bell 206 thru 407 and Bell 204 thru 412EP, UH-1H, Sikorsky UH-60A, Agusta AW-139, Airbus AS350, MDHI 369E, ER-1 (U-2), and many others.

We supported the installation of aeromedical equipment on a large fleet of Bell 206L series and 407 helicopters, weapons platforms on Bell 407 and Hughes 369 helicopters, special mission equipment such as flare/chaff dispensers, FLIR cameras, sensors on public-use (commercial derivative) Beechcraft King Airs and DHC-8-300, and large SatCom antennas on executive Airbus A330, A340 and Boeing 747-400, 747-8 airplanes.