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Functional check vs operational check.

Tue Nov 22, 2016 4:50 am

Can anyone explain what is the difference between Functional check and operational Check in aviation perspective ? basically i faced a problem to prepare the task card for functional and operational Check of FDR (Flight Data Recorder) . Actually it was not a problem , i just want to know for my own interest.
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Re: Functional check vs operational check.

Tue Nov 22, 2016 8:19 am

I primarily work Airbus for United Airbus has an operational test of the DFDR and a Fucntional tests of the related components, REF: Per AMM31-33-00-501 Task 710-006A,710-007-A for function tests for related components i.e acelerometers , the AMM also shows operational tests of Power interlocks and status monitoring They are not the same IAW Airbus though I have seen in the past where the terms were used indiscriminately, Not so much now that many tests are specific, and not so much general system tests Especially with heavily electronic controlled airplanes Like the Airbus A319,A320 or Boeing 777,787 series airplanes..
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Joined: Thu Jan 21, 2016 9:58 am

Re: Functional check vs operational check.

Tue Nov 22, 2016 11:24 am

Normally, operational check is performed on-wing, i.e the system is operated and checked in-situ, if it operates with no faults and/or messages and does the intended job. Functional check on the other hand is can be on wing or on a test bench may or may not use some special test or measuring equipment/tools and various checks/tests are performed according to a specified manual or test sheet.
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Joined: Mon Apr 04, 2011 7:53 pm

Re: Functional check vs operational check.

Tue Nov 22, 2016 5:27 pm

These are Boeing definitions that can be found in the intro of the AMM.

Operational test: That procedure required to ascertain only that a system or unit is operable.

Functional test: That procedure required to ascertain that a system or unit is functioning in all aspects in accordance with minimum acceptable system or unit design specifications.

System test: That procedure containing all adjustment specifications and tolerances required to maintain system and/or unit performance at maximum efficiency and design specifications.

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