BAC Specification Ultrasonic Inspection BMS / Controls & Processes

BAC 5439

Boeing BAC Specification – Ultrasonic Inspection

BAC 5439 Inspection – Longitudinal Wave Ultrasonic Testing
Non-Destructive Testing (NDT) | Internal Flaw Detection in Aerospace Alloys

AS9100D / ISO 9001

Certified NDT Inspections

Rapid Response RFQ

877-237-6822

Quick Specification Facts

Spec Number BAC 5439

Service Type Ultrasonic Inspection (NDT)

Spec Type Boeing Aircraft Company (BAC) Specification

Categories BMS, Controls & Processes, Specifications

Method Longitudinal Wave Ultrasonic Testing

Application Internal Flaw & Discontinuity Detection in Metal Components

Materials High-Strength Aerospace Alloys

Certification AS9100D / ISO 9001 with full inspection documentation

Specification Overview

BAC 5439 is a Boeing Aircraft Company (BAC) specification covering ultrasonic inspection services for aerospace metal components. We provide BAC 5439 ultrasonic inspection services in accordance with Boeing BAC specifications, utilizing longitudinal wave ultrasonic testing to detect internal flaws, discontinuities, and defects in metal components.

This non-destructive testing (NDT) method ensures material integrity and compliance for high-strength aerospace alloys with stringent aerospace quality standards. Certified inspections verify that critical parts meet the required specifications for safety and performance. BAC 5439 inspections are essential for aerospace and defense programs where material integrity is paramount and where undetected internal defects could compromise the safety and reliability of flight-critical components.

Inspection Capabilities

Longitudinal Wave UT

Internal Flaw Detection

Discontinuity Detection

Defect Characterization

Certified Inspection Reports

All BAC 5439 ultrasonic inspections are performed by certified NDT technicians in accordance with Boeing BAC specification requirements. Inspection documentation and certifications are provided with every order. Contact our inspection specialists for specific component requirements.

Additional Inspection Specifications Supported

Specification	Material / Alloy	Inspection Type	Notes
BAC 5439	High-Strength Aerospace Alloys	Ultrasonic Inspection	Primary Boeing BAC inspection specification
BMS 7-26	300M Alloy Steel	Ultrasonic Inspection	High-strength low-alloy steel
BMS 7-122	Aerospace Alloys	Ultrasonic Inspection	Boeing material specification inspection
BMS 7-182	HP9-4-30 Alloy Steel	Ultrasonic Inspection	High-performance alloy steel inspection
ASTM A564	17-4PH Stainless Steel	Ultrasonic Inspection	Precipitation-hardening stainless steel

We additionally offer ultrasonic inspection services for BMS 7-26 for 300M, BMS-7-122, BMS 7-182 for HP9-4-30, and ASTM A564 for 17-4PH stainless steel. Our inspections meet the required specifications to support high-strength alloy applications in demanding environments.

Key Properties & Specification Details

Property / Attribute	Details
Specification Number	BAC 5439
Issuing Organization	Boeing Aircraft Company (BAC)
Specification Type	Controls & Processes – Non-Destructive Testing (NDT)
Categories	BMS, Controls & Processes, Specifications
Inspection Method	Longitudinal Wave Ultrasonic Testing
Purpose	Detection of internal flaws, discontinuities, and defects in metal components
Applicable Materials	High-strength aerospace alloys including 300M, HP9-4-30, 17-4PH, and others
Quality Standard	Stringent aerospace quality standards for critical part verification
Documentation	Certified inspection reports verifying compliance with BAC 5439 requirements
Technician Certification	Performed by certified NDT technicians per Boeing BAC requirements
Related Specifications	BMS 7-26, BMS-7-122, BMS 7-182, ASTM A564
Certification Available	AS9100D / ISO 9001, Certificate of Conformance, Inspection Reports

Typical Applications

Aerospace & Defense Structures: Inspection of flight-critical structural components, landing gear, engine mounts, and airframe members where internal integrity must be verified to Boeing BAC 5439 standards.

High-Strength Alloy Components: Ultrasonic testing of 300M, HP9-4-30, 17-4PH, and other high-strength alloy parts to detect subsurface flaws, inclusions, and discontinuities prior to service entry.

Forgings & Machined Parts: BAC 5439 inspection of forged billets, bars, rings, and precision-machined components to ensure material soundness and compliance with Boeing procurement requirements.

Safety-Critical Parts Verification: Non-destructive verification of safety-critical parts to confirm that no unacceptable internal defects or discontinuities are present before installation in aircraft or defense systems.

Incoming Material Inspection: Inspection of raw material and semi-finished stock to Boeing BAC 5439 requirements as part of incoming quality control, ensuring that only conforming material enters the production process.

Frequently Asked Questions – BAC 5439

What is BAC 5439 and what does it cover?

BAC 5439 is a Boeing Aircraft Company (BAC) specification covering ultrasonic inspection of metal components used in aerospace applications. The specification defines requirements for longitudinal wave ultrasonic testing to detect internal flaws, discontinuities, and defects in high-strength aerospace alloys. Certified inspections performed to BAC 5439 verify that critical parts meet the required specifications for safety and performance, and are essential for Boeing-approved aerospace manufacturing and supply chain programs.

What types of defects can BAC 5439 ultrasonic inspection detect?

BAC 5439 longitudinal wave ultrasonic testing is capable of detecting a wide range of internal material defects including voids, inclusions, cracks, seams, laps, porosity, and other discontinuities that may compromise the structural integrity of a metal component. The method is particularly effective for detecting subsurface defects that are not visible by surface inspection methods. Results are compared against established acceptance criteria defined within the BAC 5439 specification to determine part conformance.

Does Aero-Vac provide BAC 5439 inspections with full certifications?

Yes. Aero-Vac provides BAC 5439 ultrasonic inspection services performed by certified NDT technicians in accordance with Boeing BAC specification requirements. We are AS9100D/ISO 9001 certified with a 99.6% quality rating. Every inspection order ships with comprehensive inspection reports, certificates of conformance, and full documentation of the inspection process and results. Electronic delivery of all documentation is available for fast turnaround. If your program requires additional special process certifications, our quality team can coordinate as needed.

What materials can be inspected under BAC 5439?

BAC 5439 ultrasonic inspection is applicable to a broad range of high-strength aerospace alloys. In addition to BAC 5439, we offer ultrasonic inspection services for BMS 7-26 for 300M alloy steel, BMS-7-122 for aerospace alloys, BMS 7-182 for HP9-4-30 high-performance alloy steel, and ASTM A564 for 17-4PH precipitation-hardening stainless steel. Our inspections meet the required specifications to support high-strength alloy applications in demanding aerospace and defense environments. Contact us with your specific material and part requirements for a tailored inspection solution.

What are the typical lead times for BAC 5439 inspection services?

Aero-Vac prioritizes rapid response for aerospace and defense inspection requirements. Typical turnaround for BAC 5439 ultrasonic inspections is significantly faster than the industry average, and we will always provide honest, upfront delivery estimates at the time of quoting. Rush inspection processing is available for urgent program requirements. Contact us with your part details, quantities, and schedule requirements and our inspection team will provide a prompt quote with realistic turnaround times.

What other inspection and testing services does Aero-Vac offer alongside BAC 5439?

Aero-Vac operates a comprehensive in-house materials testing and inspection facility at our Port of Kalama location. In addition to BAC 5439 ultrasonic inspection, we offer a full suite of mechanical testing (tensile, hardness, impact), non-destructive testing (magnetic particle, dye penetrant, eddy current), chemical analysis, and metallurgical evaluation services. We also provide value-added processing including precision cutting, surface grinding, heat treatment, and machining. Having all capabilities under one roof allows for faster turnaround, tighter quality control, and reduced overall cost compared to using multiple vendors. Contact us to discuss your complete inspection and testing requirements.

Need BAC 5439 inspection services or a custom quote?

Our NDT and inspection specialists can provide fast pricing, availability, and technical guidance for your BAC 5439 ultrasonic inspection requirements.