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Title: Flight control system clearance using static tests at Iron Bird
Authors: Patel, Ambalal V.
Patel, Vijay V.
Deodhare, Girish
Chetty, Shyam
Issue Date: Dec-2011
Publisher: NISCAIR-CSIR, India
Abstract: The Indian Light Combat Aircraft (LCA) has flown more than 485 flights so far without encountering any major faults in the flight safety critical fly-by-wire control software. This is partly due to the stringent quality control process and rigorous testing of the Control Laws (CLAW) and Air Data System Algorithms (ADS) carried out on various ground platforms such as Iron bird before flight. The pass/fail criteria for the tests carried out at the Iron bird test rig are defined based on the tolerance bounds provided on the expected results which take into account the characteristics of the associated hardware. These tolerance bounds guarantee that the correctness in functionality of the modules (CLAW, ADS) is retained, if the set of bounded inputs generate a set of bounded outputs. The processing of tolerance bounds is an algorithmic development that plays an important role in defining the acceptance criteria for the tests and enables clearance (certification) of the different modules. This paper presents the procedure used for the clearance of the static tests of the CLAW and ADS on the Iron bird platform. The details on the pass/fail criteria for the static tests and the tool developed for generating the bounds are also described. The tolerance bounds for static tests were evolved based on manufacturer's data, testers experience and engineering judgment gathered during various levels of testing of ADS and CLAW algorithms. This process yielded excellent results and was accepted as a formal clearance methodology for the onboard safety critical software.
Page(s): 163-173
ISSN: 0975-2412 (Online); 0771-7706 (Print)
Appears in Collections:BVAAP Vol.19(2) [December 2011]

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