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 | Quality experiences in aerospace electronic assembly
Author : Rama Murthy, P. B. V.;Prasad, Rajendra
Source : Defence Science Journal ; Vol:56(1) ; 2006 ; pp 81-86
Subject : 629.7 Aeronautics
Keywords : Good quality practices;PCB testing;Three tray method;Eye pieceless stereo zoom microscope;Inspection;Visual testing;Electronic assembly;Test and evaluation
Abstract : Quality of the electronic assembly depends largely on good quality practices (GQP) adopted during the process of electronic assembly. Quality experiences gained during working at the defence and space laboratories have been used to develop good quality practices such as three- tray method for cleaning of PCBs, use of grommets for cable routing, use of eye-pieceless stereo zoom microscope for visual testing/inspection, pre-tinning of components, desiccators for storage, potting prior to conformal coating, continuity and isolation checks, de-golding of leads prior to soldering, and use of flux-cored solder wire. The paper also discusses how and why these good quality practices were evolved. |
| | Defect investigation as a tool for quality improvement
Author : Gurumurthy, B. ;Nagaraja, Y. N. ;Nagesh, C. N.
Source : Defence Science Journal ; Vol:52(4) ; 2002 ; pp 369-374
Subject : 629.7 Aeronautics
Keywords : Defect investigation ;Quality improvement ;Unmanned aerial vehicle ;Link elevator ;Attachment bolt ;Wing fuselage;Stiff nut ;Inspection ;Fabrication ;Failure analysis
Abstract : Defect investigation is an important tool for quality improvement as it identifies the root cause of errors and steps to be taken to eliminate these. In this paper, four cases of defect investigation are presented. The case studies cover link elevator, wing-fuselage attachment bolt, and stiff nut for Lakshya unmanned aerial vehicle. It was observed that the link elevator was discolourised even though the material used was the stainless steel. Investigations revealed that the stainless steel was heat-treated. In the case of leading edge, it was found that there was no provision for the location of a component in the tool, resulting in mismatch. Thread damage was noticed in wing-fuselage attachment bolts because of over tightening. All these studies resulted in improvement in the raw material bonding, inspection procedures, and fabrication methods, thus resulting in quality improvement. |
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