"IGF::OT::IGF" OTHER FUNCTIONS: 1. TASK ORDER TITLE: LIGHTNING STRIKE DAMAGE ASSESSMENT ON COMPOSITE TEST P…

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"IGF::OT::IGF" OTHER FUNCTIONS: 1. TASK ORDER TITLE: LIGHTNING STRIKE DAMAGE ASSESSMENT ON COMPOSITE TEST PANELS 2. PURPOSE, OBJECTIVE, AND BACKGROUND OF WORK TO BE PERFORMED: NASA LANGLEY IS CONDUCTING RESEARCH TO DEVELOP A MULTIFUNCTION SENSOR USING SANSEC TECHNOLOGY TO PERFORM LIGHTNING STRIKE PROTECTION (LSP) MITIGATION AND DAMAGE DIAGNOSIS FOR COMPOSITE AIRCRAFT. TO ENSURE THE SANSEC LSP TECHNOLOGY IS EFFECTIVE AT REDUCING LIGHTNING DAMAGE, DAMAGE ASSESSMENTS AFTER STRIKE TESTS NEED TO BE CONDUCTED ON 30 LSP PANELS. IN ADDITION, NASA REQUIRES PRE-TEST QUALITY ASSURANCE NDI EVALUATIONS ON 10 LIGHTING STRIKE PROTECTION (LSP) COMPOSITE TEST PANELS. 12 PANELS SHALL ALSO UNDERGO SHIELDING EFFECTIVENESS CHARACTERIZATIONS. THESE TESTS ARE REQUIRED TO ESTABLISH BASELINE CHARACTERIZATION BEFORE THE LIGHTNING STRIKE TESTS SCHEDULED JUNE 24. 3. DESCRIPTION OF THE WORK TO BE PERFORMED: THE CONTRACTOR SHALL PERFORM THE FOLLOWING ON 20 X 20 CARBON COMPOSITE TEST PANELS. 3.1 THE CONTRACTOR SHALL PERFORM DAMAGE ASSESSMENTS ON THIRTY (30) LIGHTNING STRUCK COMPOSITE TEST PANELS FOLLOWING THE TEST PROCEDURES DEFINED WITHIN DOCUMENT NUMBER: DOC-128697 TITLED LSP COMPOSITE SUBSTRATE DESTRUCTIVE EVALUATION TEST . THE TESTED PANELS SHALL BE NONDESTRUCTIVELY AND DESTRUCTIVELY EXAMINED FOR DAMAGE INCLUDING FIBER BREAKOUT OR BACKSIDE FRACTURE OF THE PANEL. NONDESTRUCTIVE EVALUATIONS INCLUDE VISUAL SURFACE DAMAGE AREA ASSESSMENTS, MACRO-PHOTOGRAPHY, DAMAGE DEPTH ASSESSMENTS BY PULSE-ECHO ULTRASONIC METHODS AND OPTIONAL METAL DAMAGE ASSESSMENT BY X-RAY INSPECTION. DESTRUCTIVE INSPECTION IS PERFORMED BY TAPER SANDING AND DOCUMENTED BY MACRO-PHOTOGRAPHY AFTER COMPLETION OF THE NONDESTRUCTIVE INSPECTIONS. ASSESSMENT RESULTS AND DATA OF THE FIRST 18 PANELS RECORDING THE DAMAGE AREA OF EACH PANEL SHALL BE CLEARLY DOCUMENTED IN A PRELIMINARY DAMAGE ASSESSMENT REPORT. FINAL DAMAGE ASSESSMENT RESULTS AND DATA OF ALL THIRTY (30) LSP PANELS SHALL BE DOCUMENTED IN A FINAL DAMAGE ASSESSMENT REPORT. THE FOLLOWING LIST IS A SUMMARY OF THE STEPS TO BE PERFORMED -- REFERENCE DOCUMENT NUMBER: DOC-128697 TITLED LSP COMPOSITE SUBSTRATE DESTRUCTIVE EVALUATION TEST : 1. VISUALLY EXAMINE BOTH SIDES OF PANEL FOR EVIDENCE OF DAMAGE. DETERMINE IF BACK SIDE OF PANEL HAS BEEN DAMAGED. MARK OUTLINE OF VISIBLE DAMAGE ON PANEL SIDE(S), INCLUDING PAINT BLISTERING, WITH INDELIBLE NON-BLACK MARKER, COLOR #1. REF SECTION 3.1.1. 2. DO ULTRASONIC PULSE-ECHO EXAMINATION OF PANEL FROM BOTH SIDES AND MARK OUTLINE OF DAMAGE ON FRONT SIDE OF PANEL WITH INDELIBLE NON-BLACK MARKER, COLOR #2 (PERCEPTIBLY DIFFERENT FROM COLOR #1). REF SECTION 3.1.2. 3. PERFORM OPTIONAL X-RAY EXAMINATION OF PANEL. OVERLAY X-RAY FILM (OR 1:1 RENDERING OF DIGITAL IMAGE) ON PANEL AND MARK OUTLINE OF DAMAGE ON FRONT SIDE OF PANEL WITH INDELIBLE NON-BLACK MARKER, COLOR #3 (PERCEPTIBLY DIFFERENT FROM COLORS #1 AND #2). REF SECTION 3.1.3. 4. MARK A KEY ON EACH PANEL DELINEATING MAPPING BETWEEN COLOR SELECTION AND INSPECTION METHOD. THEN PHOTOGRAPH BOTH SIDES OF PANEL TO CAPTURE ALL DAMAGED AREAS AND MARKINGS. 5. MEASURE AND CALCULATE DAMAGED AREA. REF SECTION 3.1.1. 6. TAPER SAND FROM THE FRONT SIDE TO REMOVE DAMAGED MATERIAL UNDER STRIKE POINT AND ANY SIMULATED LIGHTNING REATTACHMENT POINTS UNTIL ONLY UNDAMAGED MATERIAL REMAINS. REF SECTION 3.2. 7. MEASURE REMAINING THICKNESS (IF ANY) OF UNDAMAGED PANEL MATERIAL IN LOCUS OF ATTACHMENT POINT(S) USING DEEP-THROAT MICROMETER. 8. PHOTOGRAPH THE AREAS WHERE DAMAGED MATERIAL WAS REMOVED IN STEP 6. 3.2 THE CONTRACTOR SHALL PERFORM NONDESTRUCTIVE EVALUATIONS ON TEN (10) LSP COMPOSITE TEST PANELS FOLLOWING GUIDANCE PROCEDURES DEFINED IN DOCUMENT NUMBER: DOC-128695 TITLED LSP COMPOSITE SUBSTRATE NDE ASSESSMENT MANUAL . THIS DOCUMENT DEFINES THE FOLLOWING TEST PROCEDURE TO BE CONDUCTED. INSPECT THE CURED PANEL WITH A THROUGH TRANSMISSION ULTRASONIC (TTU) `C SCAN INSPECTION AT 5 MHZ. AN ULTRASONIC INDICATION (FLAW) IS AN AREA