Journal of Accident Investigation

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JOSEPH GREGOR Figure 4. FDR on-key/off-key data, FDR(n), where “n” represents the subframe reference number (SRN) corresponding to the number of seconds since the FDR first began recording. A “1” indicates that the microphone was found keyed-on at the sample time. Figure 5. CVR on-key/off-key data, CVR(n), where “n” represents the sample number. The data in this figure were sampled at a 1 Hz rate to facilitate comparison with FDR(n). A “1” indicates that the microphone was found keyed-on at the sample time. 48 NTSB JOURNAL OF ACCIDENT INVESTIGATION, SPRING 2006; VOLUME 2, ISSUE 1
A MATHEMATICAL CROSS-CORRELATION FOR TIME-ALIGNMENT OF COCKPIT VOICE RECORDER AND FLIGHT DATA RECORDER DATA Figure 6. Results of the cross-correlation between FDR(n) and CVR(n) showing a well-defined peak at n = 1763 lags. Figure 7. Overlay of FDR(n) [designated by x’s] with CVR(n) [designated by o’s] showing the alignment of identical events once the offset found via the cross-correlation was applied. NTSB JOURNAL OF ACCIDENT INVESTIGATION, SPRING 2006; VOLUME 2, ISSUE 1 49
Page 1 and 2: National Transportation Safety Boar
Page 3: OURNAL JOF ACCIDENT INVESTIGATION A
Page 6 and 7: CHARLES H. SIMPSON and controlled r
Page 9 and 10: Investigative Techniques Materials
Page 11 and 12: 24 “I”-shaped stringers that sp
Page 13 and 14: Fractographic Examination Procedure
Page 15 and 16: MATERIALS EXAMINATION OF THE VERTIC
Page 17 and 18: to the left. The left aft lug had d
Page 19 and 20: and forward on the side of the dela
Page 21 and 22: lug in a plane nearly parallel to t
Page 23 and 24: Developing Animations to Support Co
Page 25 and 26: Figure 2, illustrating control inpu
Page 27 and 28: Figure 5. FDR data converted and in
Page 29 and 30: DEVELOPING ANIMATIONS TO SUPPORT CO
Page 31 and 32: Aviation Recorder Overview Dennis R
Page 33 and 34: 2. 3. 4. . 6. On existing transport
Page 35 and 36: As a result of the Swissair acciden
Page 37 and 38: Fire Its obvious disadvantages were
Page 39 and 40: investigators and the recorder indu
Page 41 and 42: crew entries to the navigation data
Page 43 and 44: A Mathematical Cross-Correlation fo
Page 45 and 46: ambiguity, creating difficulty in d
Page 47: A MATHEMATICAL CROSS-CORRELATION FO
Page 51 and 52: A MATHEMATICAL CROSS-CORRELATION FO
Page 53: of the cross-correlation function t
Page 56 and 57: KRISTIN M. POLAND, LINDA McCRAY, AN
Page 68 and 69: BRUCE G. COURY adult PFD requiremen
Page 70 and 71: BRUCE G. COURY A 6-year observation
Page 72 and 73: BRUCE G. COURY that NASBLA develop
Page 74 and 75: BRUCE G. COURY Finally, the Safety
Page 76 and 77: JANA PRICE AND JIM SOUTHWORTH Notic
Page 78 and 79: JANA PRICE AND JIM SOUTHWORTH NATIO

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