
Structural Integrity Engineering
Structural Integrity Engineering, Inc. (SIE), was formed in 1981 to provide engineering, project development and technical consulting services to the aerospace industry. SIE is headquartered in Chatsworth California (30 miles north of Los Angeles) and also has branch offices in Seattle (Mukilteo, Washington near Boeing) and Madrid, Spain. SIE has a staff of 50 professionals consisting of certification engineers, aircraft designers and aircraft technicians. Five of the company’s engineers are FAA Designated Engineering Representatives (FAA DER) who have authority to approve reports and drawings for the FAA.
With the exception of the prime airframe OEM’s, SIE has performed more damage tolerance analysis for commercial aircraft than any other organization in the country.

The Art of Aerospace Engineering
SIE maintains a stable work force through its business model that includes a mix of outside consulting work and “in-house” projects. Aircraft design and certification is the company’s “core” business.

SIE's Experienced Team
A Stable and Growing Staff
Over the last 30 years, the principals have specialized in aircraft research and development programs involving advanced design, structural analysis and certification. These design and analytical capabilities also include fatigue and damage tolerance considerations associated with aging aircraft. SIE is widely recognized by the FAA, and the aircraft industry-at-large as a leading expert in the areas of structural substantiation, fracture mechanics, fatigue and damage tolerance analysis and certification, as well as aircraft cargo conversions.
History of SIE
1981
SIE founded
Damage Tolerance Analysis/Fatigue consulted

1986
Stress Analysis and Finite Element Capability

1989
Structural Certification of DC-8 Hushkit

1991
Damage Tolerance (First DER)

1992
External Aerodynamic Loads, Operational Weight Upgrades for DC-8, B727

1995
STCs for Freighter Floors and Cargo Barriers
1996
Structural Design

1999
VIP Interiors

2002
Systems Design and Certification (Electrical/Mechanical)
2003
Twin Otter Wing Life Extension STC
2006
Design, Analysis, Certification, B757-200 Passenger to Freighter Conversion
2008
Pylon & Associated Systems for Honeywell Flying Test Bed Aircraft

2009
Procurement of Fabricated Parts & Components, Wifi and InFlight Entertainment Systems Installation & Design
2011
SIE Utilizes Additive Manufacturing for ECS Duct Modification

2012
ORBIS Flying Eye Hospital
2014
AS9100 Certification
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2015
Developed Test Pylon for GE Aviations’ Passport 20 Engine

2016
Started work on A320 Passenger to Freighter Conversion Program

2017
SIE Assists Honeywell in modification of its FTB
