PROGRESS IN THE NONDESTRUCTIVE EVALUATION OF CF-18 COMPOSITE FLIGHT CONTROLS FOR WATER INGRESS AND RELATED DAMAGE

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Authors
  1. Lepine, B.A.
  2. McRae, K.I.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
A Nondestructive Testing (NDT) program was initiated with the goal of inspecting flight controls from several CF-18's for water ingress and related damage using three NDT methods: X-ray, neutron radiography (N-ray), and through transmission ultrasonics, all in various facilities. Based on three full sets of flight controls plus some individual rudders, the NDT results presented in this report show that various stages of failure modes may exist in the fleet's flight controls. Some of the specimens are advanced to the stage of disbonds which could, if left untreated, progress further to point of possible in-flight skin failure. Of all the components, the rudders have the most serious problems with high moisture levels in the honeycomb core and/or disbonds near the top hinge. About 50% of the rudders inspected have some type of moisture related damage. Although the N-ray technique reported several corrosion indications, destructive analysis performed on two rudders with some of the most advanced stages of damage revealed no evidence of corrosion products. It is recommended that the program continues to perform sample inspections of several more CF-18s, as more data is required to make a more definite fleet assessment. As a secondary goal, the three methods were evaluated and correlated against each other. TRUNCATED
Keywords
Disbonding;Aluminum honeycomb core;Graphite/epoxy skin;Ultrasonics;Neutron radiography;Debonding
Report Number
DCIEM-98-TM-44 — Technical Memorandum
Date of publication
01 Jun 1998
Number of Pages
24
DSTKIM No
98-01932
CANDIS No
508779
Format(s):
Hardcopy;Document Image stored on Optical Disk

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