On January 11,, we, the Federal Aviation Administration (FAA), published Advisory Circular (AC) B recognizing RTCA/DOB, Software. FAA Underestimated Complexity of Proving the Integrity Requirement SAE ARP /, RTCA DOB; Consists of Audits/Reviews of. [5] FAA AC B, RTCA DOB – FAA policy which invokes RTCA [6] RTCA DOB/EUROCAE EDB, Software Considerations in Airborne Systems.

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Thanks for making things in one place. Please refer the DO B Pdf for more information. Thanks for putting question on Do ,This question are really good. Thanks for visiting the Website!!!!! Please go through the required information in this website only.

If you add independent objective in question 16 software table, it will good for the beginners. What are changes are made in DOC? Good website to learn DO I have seen some interview questions like why to follow DO, what happens if not followed and is it mandatory to follow the each and everything in DO Firstly, DOB is a guidelines document not a standard to follow strictly. Guidelines always help to make things in correct direction. Hope I answered your question, eo178b you not clear please revert.

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Software Life Cycle process is. Removal of the errors is an activity of the software development processes. Radio Technical Commission for Aeronautics.

Federal Aviation Administration, the organization responsible for controlling air traffic safety in the United States.

FAA lists DOB as a means of compliance that is acceptable to the regulators of software in the avionics community. European Organization for Civil Aviation Equipment.


Joint Aviation Authorities in Europe. A DER evaluates processes for compliance with certification objectives. He ensures process complies by assessing plans and procedures for compliance.

DOB defines five software levels based on severity of failure.

DO178B Interview Questions

Each level is defined by the failure condition that can result from anomalous behavior of software. The software level is determined after system safety assessment and the safety impact of software is known.

Failure conditions which would prevent continued safe flight and landing. Failure conditions which would reduce the do178bb of the aircraft or the ability of the crew. A significant reduction in safety margins or functional capabilities, a significant increase in crew workload.

Failure conditions involve crew actions that are well within their capabilities and significantly reduce aircraft safety. In-Flight Entertainment System of any commercial aircraft in service. Failure conditions which do not affect the operational capability of the aircraft or increase crew workload. Vending machine on aircraft. System Safety assessment department within an equipment manufacturing organization would provide the first level inputs on the same.

This in itself is a detailed process.

The software requirements process uses the outputs of the system life cycle process to develop the software high-level requirements. These high level requirements include Functional, performance, interface and safety-related requirements.

DOB – Wikipedia

The design description is definition of the software architecture and the low-level D178b that will satisfy the software high-level requirements. This data should Include.

Derived Low Level requirements are identified separately.

In the software coding process, the Source Code is implemented from the software Architecture and the low-level requirements. If an item, artifact is CC1 then it must have all those attributes in the table in section 7. Meaning it needs to have baselines, change management, etc.


It really only needs to be retained. Simply put a CC1 item needs to be tracked where as a CC2 item needs to be stored. Whereas CC1 items tend to be documents that need to be maintained, tracked and base lined. Is it a big deal in DOB, well yes. Source to Object code verification, Refer 6. We build systems to meet the requirements of our users. Derived requirements are lesser than user requirements. It is easy, however, to forget this relationship, and this can cause many problems for our projects.

A derived requirement is something that we infer or derive from a user requirement. We derive these requirements by delving into the details of the user requirement. Hi Mahadev, thanks for the feedback.

DOC – Wikipedia

Thanks for creating this blog, this will help all level of avionics engineers. Hi Nagendra, Thanks for visiting the Website!!!!! Hi Venkat, Thanks for visiting the site!! Please list those type of questions also. Hi Sai, Thanks for posting!!

Leave a Reply Cancel reply Your email address will not be published. Level A 66 Objectives. Level B 65 Objectives. Level C 57 Objectives. Level D 28 Objectives.