Project Summary: Aviation Investigation - 183 Docket Items - DCA96MA068

Description: McDonnell Douglas -- MD-88

Mode: Aviation

NTSB Number: DCA96MA068

Date of Accident: 07/06/1996

City: PENSACOLA

State/Region: FL

Country: United States

Project Type: Investigation

Docket Information

Creation Date: 03/19/1997

Last Modified: 12/17/2018 1:27 PM

Public Release Date & Time: 03/25/1997 3:01 PM


Docket Table of Contents

Docket Items: 183
#
Title
Pgs
Photo
Type
File
1 Ordering of Hearing: 1A 1 0 Adobe PDF file View
2 Notice of Designation of Chairman of Board of Inquiry: 1B 1 0 Adobe PDF file View
3 Designation of Hearing Officer: 1C 1 0 Adobe PDF file View
4 Designation of Parties to the Hearing: 1D 1 0 Adobe PDF file View
5 Notice of Hearing: 1E 1 0 Adobe PDF file View
6 Operations 2 -Exhibit No. 2A - Group Chairman Factual Report - Operational Factors/Human Performance 11 0 Adobe PDF file View
7 Operations 2 - Attachment 1 - Log of Aircraft N927DA Movement 3 0 Adobe PDF file View
8 Operations 2 - Attachment 2 - Copy of Pilot's Trip Sequence 2 0 Adobe PDF file View
9 Operations 2 - Attachment 3 - Copies of DL 1288 Flight Papers and Weight & Balance 17 0 Adobe PDF file View
10 Operations 2 - Attachment 4 - Aircraft Emergency Equipment and Seat Location 2 0 Adobe PDF file View
11 Operations 2 - Attachment 5 - Copy of ACARS Log 2 0 Adobe PDF file View
12 Operations 2 - Attachment 6 - Copy of Engine Instruments and Operating Parameters 6 0 Adobe PDF file View
13 Operations 2 - Attachment 7 - Copy of Normal Takeoff Procedures 2 0 Adobe PDF file View
14 Operations 2 - Attachment 8 - Copy of Pilot's Rejected Takeoff Procedures 2 0 Adobe PDF file View
15 Operations 2 - Attachment 9 - Copy of Pilot's Passenger Evacuation Procedures 4 0 Adobe PDF file View
16 Operations 2 - Attachment 10- Emergency Lights, Emergency Exits Location and Operation 14 0 Adobe PDF file View
17 Operations 2 - Attachment 11- Throttle and Fuel Control Lever Location 2 0 Adobe PDF file View
18 Operations 2 - Attachment 12- Engine Fire Handle Location 2 0 Adobe PDF file View
19 Operations 2 - Attachment 13- Airport Information 8 0 Adobe PDF file View
20 Operations 2 - Attachment 14-Air Traffic Control Voice Transcripts 31 0 Adobe PDF file View
21 Survival Factors 6 - Group Chairman Factual Report 7 0 Adobe PDF file View
22 Survival Factors 6 - Attachment A - Crew and Passenger Seats, Restraint Systems, and Safety Appliances 11 0 Adobe PDF file View
23 Survival Factors 6 - Attachment B - Airplane Cabin Diagram 2 0 Adobe PDF file View
24 Survival Factors 6 - Attachment C - Photographic Supplement 6 0 Adobe PDF file View
25 Survival Factors 6 - Attachment D - Flight Attendant Interviews 8 0 Adobe PDF file View
26 Survival Factors 6 - Attachment E - Passenger and Other Witness Interviews 9 0 Adobe PDF file View
27 Survival Factors 6 - Attachment F - Flight Attendant Training Records 5 0 Adobe PDF file View
28 Survival Factors 6 - Attachment G - Passenger Safety Briefing Card 5 0 Adobe PDF file View
29 Structures 7 - Exhibit No. 7A - Group Chairman Factual Report - Structures/Systems 20 0 Adobe PDF file View
30 Photo 1. N927DA on runway 17 after coming to a stop. The oil streak is visible left of the runway centerline. 1 0 Adobe PDF file View
31 Photo 2. Aerial view showing damage to left fuselage and left engine. 1 0 Adobe PDF file View
32 Photo 3. Left fuselage penetration damage. 1 0 Adobe PDF file View
33 Photo 4. Left fuselage and engine damage, including fire damage to nacelle. 1 0 Adobe PDF file View
34 Photo 5. Right fuselage exit damage. 1 0 Adobe PDF file View
35 Photo 6. Fragment damage to left wingtip. 1 0 Adobe PDF file View
36 Photo 7. Wire gundle located along right longeron 4; 146 of the 154 wires in the wire bundle had been severed. 1 0 Adobe PDF file View
37 Photo 8. Interior view of left fuselage penetration damage adjacent to row 37. 1 0 Adobe PDF file View
38 Photo 9. Interior view of left fuselage penetration damage adjacent to row 37. 1 0 Adobe PDF file View
39 Structures 7 - Exhibit No. 7B - Wreckage Distribution, Hub Piece Locations 2 0 Adobe PDF file View
40 Structures 7 - Exhibit No. 7C - Wreckage Photographs (3) 3 0 Adobe PDF file View
41 Powerplants 8 - Exhibit No. 8A - Group Chairman Factual Report 17 0 Adobe PDF file View
42 Powerplants 8 - Exhibit No. 8B - Figures and Photographs 13 0 Adobe PDF file View
43 Powerplants 8 - Exhibit No. 8B-1 - Volva Manufacturing Drawing 0-169282 Sheets 1 and 4 - Volvo Hub Front Drill Process History 4 0 Adobe PDF file View
44 Powerplants 8 - Exhibit No. 8C - Powerplants Group Chairman's Factual Report of Investigation NTSB Accident MIA82IA051 March 18, 1982 17 0 Adobe PDF file View
45 Powerplants 8 - Exhibit No. 8D - Pratt & Whitney Research Report 704297-2440 April 5, 1982 11 0 Adobe PDF file View
46 Powerplants 8 - Exhibit No. 8E - Technical Review of Fluorescent Penetrant Process Delta Airlines, Inc.. August 13 & 14, 1996 46 0 Adobe PDF file View
47 Powerplants 8 - Exhibit No. 8F - ANE-180 Evaluation Report of Pratt & Whitney Quality System - September 30, 1996 6 0 Adobe PDF file View
48 Powerplants 8 - Exhibit No. 8G - Attachment 1 - Phase 1 Report (Pratt & Whitney) 33 0 Adobe PDF file View
49 Powerplants 8 - Exhibit No. 8H - Attachment 2 - Phase II Report (Volvo) 24 0 Adobe PDF file View
50 Powerplants 8 - Exhibit No. 8I - Pratt & Whitney Chart Process Control/Quality Inspections of a Titanium Part (Undated) 2 0 Adobe PDF file View
51 Powerplants 8 - Exhibit No. 8J - JT8D-200 Series Fan Hub Industry Meeting 93 0 Adobe PDF file View
52 Powerplants 8 - Exhibit No. 8K - 14 CFR Parts 21 and 33 Selected Papers 7 0 Adobe PDF file View
53 Powerplants 8 - Exhibit No. 8L - Volvo Aero Corporation Drill Type 1 0 Adobe PDF file View
54 Photo 1. Drill Type 1 0 Adobe PDF file View
55 Powerplants 8 - Exhibit No. 8M - Volvo Aero Corporation Drilling with HSS 1 0 Adobe PDF file View
56 Photo 1. Drilling with HSS 1 0 Adobe PDF file View
57 Powerplants 8 -Exhibit No. 8N - Volvo Aero Corporation Quality System 1 0 Adobe PDF file View
58 Photo 1. Volvo Aero Corporation Quality System 1 0 Adobe PDF file View
59 Powerplants 8 - Exhibit No. 8O - Volvo Aero Corporation Quality System 1988 1 0 Adobe PDF file View
60 Photo 1. Volvo Aero Corporation Quality System 1988 1 0 Adobe PDF file View
61 Powerplants 8 - Exhibit No. 8P - Volvo Aero Corporation Quality System 1997 1 0 Adobe PDF file View
62 Photo 1. Volvo Aero Corporation Quaility System 1997 1 0 Adobe PDF file View
63 Powerplants 8 - Exhibit No. 8Q - Volvo Aero Corporation Finished Part 1 0 Adobe PDF file View
64 Photo 1. Volvo Aero Corporation Finished Part 1 0 Adobe PDF file View
65 Powerplants 8 -Exhibit No. 8R - NTSB Safety Recommendations A-96-74, -75, -76, and -77 July 29, 1996 - with Related Documents 31 0 Adobe PDF file View
66 Flight Data Recorder 10 - Group Chairman Factual Report 5 0 Adobe PDF file View
67 Flight Data Recorder 10 - Attachment 1--DFDR Parameter Listing 2 0 Adobe PDF file View
68 Flight Data Recorder 10 - Attachment 2--Plotted Data 3 0 Adobe PDF file View
69 Flight Data Recorder 10 - Attachment 3 - Tabular Data 9 0 Adobe PDF file View
70 Maintenance Records 11 - Exhibit No. 11A - Group Chairman Factual Report 12 0 Adobe PDF file View
71 Maintenance Records 11 - Exhibit No. 11B - Attachment 1 - Pratt & Whitney Statement July 10, 1996 3 0 Adobe PDF file View
72 Maintenance Records 11 - Exhibit No. 11C - Attachment 2 - Pratt & Whitney Quality Standard Visual Inspection Standard 454 (With Deletions) 8 0 Adobe PDF file View
73 Maintenance Records 11 - Exhibit No. 11D - Attachment 3 - Pratt & Whitney Suppliers Report of Nonconformance 4 0 Adobe PDF file View
74 Maintenance Records 11 - Exhibit No. 11E - Attachment 4 - English Translation of Volvo's Manufacturing Records on HUB S/N 32971 33 0 Adobe PDF file View
75 Maintenance Records 11 - Attachment 5 - Pratt & Whitney Letter/Statement Addressing Their Involvement with Volvo July 19, 1996 5 0 Adobe PDF file View
76 Maintenance Records 11 - Attachment 6 - Interview Statement and Fax From Pratt & Whitney Representative July 30, 1996 3 0 Adobe PDF file View
77 Maintenance Records 11 - Attachment 7 - Delta Air Lines JT8D-219 Engine Shop Visit Maintenance Program and Related Sign-Off Sheeets 9 0 Adobe PDF file View
78 Maintenance Records 11 - Attachment 8 - Pratt & Whitney JT8D Engine Manual Front Compressor HUB Inspection Section 72-33-31 13 0 Adobe PDF file View
79 Maintenance Records 11 - Attachment 9 - Delta Air Lines JT8D-219 Engine Maintenance Management Plan (EMMP) Light Maintenance Guidance and Records for Work Done on Engine and HUB 6 0 Adobe PDF file View
80 Maintenance Records 11 - Attachment 10 - Delta Air Lines JT8D-219 EMMP Heavy Maintenance Plan 2 0 Adobe PDF file View
81 Maintenance Records 11 - Attachment 11 - Delta Air Lines Engine Test Log Engine S/N 726984 Dated December 30, 1995 8 0 Adobe PDF file View
82 Maintenance Records 11 - Attachment 12 - Delta Air Lines Life Limited Part History and Job Instruction Cards with Sign-Offs Engine S/N 726984 6 0 Adobe PDF file View
83 Maintenance Records 11 - Attachment 13 - Delta Air Lines Oil Consumption Records and Pratt and Whitney's Oil Consumption Valves JT8D-219 3 0 Adobe PDF file View
84 Maintenance Records 11 - Attachment 14 - Delta Air Lines Maintenance History on Engine S/N 726984 Between 12/21/95 And It's Installation on N927DA 89 0 Adobe PDF file View
85 Maintenance Records 11 - Exhibit No. 11F - Attachment 15 - Delta Air Lines Training Records of The Inspectors Who Last Inspected The Accident HUB S/N 32971 8 0 Adobe PDF file View
86 Maintenance Records 11 - Exhibit No. 11G - Attachment 16 - Nondestructive Guidelines For Inspector (Delta) Training By Air Transport Association ATA Specification 105 8 0 Adobe PDF file View
87 Maintenance Records 11 - Exhibit No. 11H - Attachment 17 - Delta Air Lines NDT Inspector's Physical Examination Guide, Excerpt, Eye Exam 2 0 Adobe PDF file View
88 Maintenance Records 11 - Exhibit No. 11I - Attachment 18 - Interview Statement With Delta's NDI Inspector 3 0 Adobe PDF file View
89 Maintenance Records 11 - Exhibit No. 11J - Attachment 19 - Delta Air Lines Statement Concerning Plastic Bead Blasting Dated August 22, 1996 1 0 Adobe PDF file View
90 Maintenance Records 11 - Exhibit No. 11K - Attachment 20 - Pratt & Whitney JT8D Engine Manual Process Standard Excerpt Plastic Bead Blasting 1 0 Adobe PDF file View
91 Maintenance Records 11 - Exhibit No. 11L - Attachment 21 - Pratt & Whitney JT8D Engine Manual Front Compressor Group 1st Stage HUB Cleaning Spop 19 Plastic Bead 4 0 Adobe PDF file View
92 Maintenance Records 11 - Exhibit No. 11M - Attachment 22 - Delta Air Lines Process Standard For Past Preparation and Inspection, No. 900-6-3, Dated October 1, 1995 3 0 Adobe PDF file View
93 Maintenance Records 11 - Exhibit No. 11N - Attachment 23 - Delta Air Lines Process Standard FPI 900-6-3 No. 2 Dated June 15, 1996 28 0 Adobe PDF file View
94 Maintenance Records 11 - Exhibit No. 11O - Attachment 24 - Delta Air Lines Engine Records, HUB N1 Comp Front (JTD-219) 4 0 Adobe PDF file View
95 Maintenance Records 11 - Exhibit No. 11P - Delta Air Lines Internal Memorandum Responding to FAA'S FPI Technical Review 35 0 Adobe PDF file View
96 Maintenance Records 11 - Exhibit No. 11Q - Delta Air Lines Copy of Pratt & Whitney's February, 1995 FPI Inspection Report 4 0 Adobe PDF file View
97 Maintenance Records 11 - Exhibit No. 11R - Pratt & Whitney JT8D Engine Manual Front Compressor Group Cleaning 14 0 Adobe PDF file View
98 Maintenance Records 11 - Exhibit No. 11S - Delta Process Standard 9001-1 No. 18/21 Excerpt on Cleaning 13 0 Adobe PDF file View
99 Maintenance Records 11 - Exhibit No. 11T - GE Product Support Review of the Delta Atlanta TOC Engine Component FPI and Cleaning Process 14 0 Adobe PDF file View
100 Maintenance Records 11 - Exhibit No. 11U - Delta Air Lines Flow Chart On The Post Emulsify Type Penetrant System 2 0 Adobe PDF file View
101 Cockpit Voice Recorder 12 - Group Chairman Factual Report 39 0 Adobe PDF file View
102 Materials Laboratory 15 - Exhibit No. 15A - Metallurgist's Factual Report 10 0 Adobe PDF file View
103 Materials Laboratory 15 - Exhibit No. 15B - Metallurgist's Factual Report Supporting Material 11 0 Adobe PDF file View
104 Materials Laboratory 15 - Evans East---Time-Of-Flight Secondary IOM Mass Spectrometry Analytical Report 20 0 Adobe PDF file View
105 Materials Laboratory 15 - Exhibit No. 15C - Three Pieces of the Hub, As Received In The Materials Laboratory 1 0 Adobe PDF file View
106 Materials Laboratory 15 - Photo 1. Photograph Of Exhibit No. 15C 1 0 Adobe PDF file View
107 Materials Laboratory 15 - Exhibit No. 15D - Fracture Face On The Hub 1 0 Adobe PDF file View
108 Materials Laboratory 15 - Photo 1. Photograph of Exhibit No. 15D 1 0 Adobe PDF file View
109 Materials Laboratory 15 - Exhibit No. 15E - Angled View Of The Facture Face At The Aft End Of The Tierod Hole 1 0 Adobe PDF file View
110 Materials Laboratory 15 - Photo 1. Photograph of Exhibit No. 15E 1 0 Adobe PDF file View
111 Materials Laboratory 15 - Exhibit No. 15F - Scanning Electron Microscope View Of The Tierod Hole Surface At Origin "02" 1 0 Adobe PDF file View
112 Materials Laboratory 15 - Photo 1. Photograph of Exhibit No. 15F 1 0 Adobe PDF file View
113 Materials Laboratory 15 - Exhibit No. 15G - Microstructure In The Damaged Portion Of The Tierod Hole 1 0 Adobe PDF file View
114 Materials Laboratory 15 - Photo 1. Photograph of Exhibit No. 15G 1 0 Adobe PDF file View
115 Materials Laboratory 15 - Exhibit No. 15H - Blue Etch Anodize Test on Fracture Sample 1 0 Adobe PDF file View
116 Public Hearing Transcript 3/26/97 - 362 pages 362 0 Adobe PDF file View
117 Public Hearing Transcript 3/27/97 - 312 pages 312 0 Adobe PDF file View
118 Public Hearing Transcript 3/28/97 - 224 pages 224 0 Adobe PDF file View
119 Proposal of Corrections in Mr. B. Anderson's Testimony at the Public Hearing in Atlanta, March 26-28, 1997 100 0 Adobe PDF file View
120 Correspondence from Pratt & Whitney 1 0 Adobe PDF file View
121 Pratt & Whitney Submission to NTSB 12 0 Adobe PDF file View
122 Correspondence from Air Line PIlots Association 6 0 Adobe PDF file View
123 Correspondence from Delta Air Lines Party Coordinator 1 0 Adobe PDF file View
124 Correspondence from Delta Air Lines 1 0 Adobe PDF file View
125 Delta Air Lines Submission to the NTSB 52 0 Adobe PDF file View
126 Metallurgist's Factual Report 97-117 6 0 Adobe PDF file View
127 Characterization of Mounted Hub Section (Material Characterization) 12 0 Adobe PDF file View
128 Photo 1. Mounted Specimen. Mounting material was cut before removal for SIMS analysis. The tierod hole is identified. The boxed region contains the fracture origin and the "hardened layer". 1 0 Adobe PDF file View
129 Photo 2. Oxygen and arbon SIMS maps from first region examined. White indicated higher elemental concentrations. Both oxygen and carbon were observed to be concentrated in the "hardened layer" as well as in the cracks (white 1 0 Adobe PDF file View
130 Photo 3. Oxygen, carbon, iron, and silicon SIMS maps of the second region examined. Elevated concentrations (more white) of oxygen, carbon, and iron were observed in the "hardened layer". 1 0 Adobe PDF file View
131 Photo 4. Backscatter electron image photomicrograph of polished surface containing "hardened layer" and at least 29 cracks. The red arrows in Regions 1 and 2 identify observed plastic deformation under the "hardened layer". 1 0 Adobe PDF file View
132 Photo 5. EDS map of the location labeled "A" in Region 1, Figure 4. An elevated concentration of K-bank iron was found in the patch of high intensity backscatter electrons (arrow). 1 0 Adobe PDF file View
133 Photo 6. EDS map of Region 3, Figure 4. Elevated concentrations of K-band oxygen, aluminum, iron, and chromium (arrows) were identified. 1 0 Adobe PDF file View
134 Photo 7. EDS map of bulk microstructure (Region 4, Figure 4.) ELevated concentrations of K-bank aluminum were observed to correspond to equiaxed alpha microstructure (arrows). 1 0 Adobe PDF file View
135 Photo 8. Backscatter electron image of the tierod hole surface. The red arrows identify patches of high intensity electron return. The yellow arrows identify the directional marring. White arrows outline the changed surface 1 0 Adobe PDF file View
136 Photo 9. EDS map of Region 5, Figure 8. Elevated concentrations of K-band iron and chromium were identified in the regions of high intensity backscatter electron return (arrows). 1 0 Adobe PDF file View
137 Photo 10. EDS map of the directional marring found in Region 6, Figure 8. K-bank oxygen and silicon were identified in the marred regions. 1 0 Adobe PDF file View
138 Photo 11. EDS map of Region 7, Figure 8. K-bank oxygen and silicon (arrows) were observed on the regions of low intensity backscatter electron return. 1 0 Adobe PDF file View
139 Photo 12. EDS map of the high intensity backscatter electron return from region 8, Figure 8. An alevated concentration of K-band iron (arrow) was observed. 1 0 Adobe PDF file View
140 Photo 13. EDS spectrum taken from gold coated section of mounting compound. The oxygen and silicon peaks are identified. 1 0 Adobe PDF file View
141 Characterization of Mounted Hub Section - Attachment 1 2 0 Adobe PDF file View
142 Characterization of Mounted Hub Section - Attachment 2 3 0 Adobe PDF file View
143 Characterization of Mounted Hub Section - Attachment 3 3 0 Adobe PDF file View
144 Characterization of Mounted Hub Section - Attachment 4 3 0 Adobe PDF file View
145 Delta Air Lines Party Coordinator's Submitted Comments on McDonnell Douglas' Submission 1 0 Adobe PDF file View
146 Metallurgist's Factual Report 97-136 15 0 Adobe PDF file View
147 Volvo Aero Corporation Submission 8 0 Adobe PDF file View
148 Photo 1. Hole #2B. Cutting without coolant with HSS drill to breakdown. Cutting data see report 9634-0101. 1 0 Adobe PDF file View
149 Photo 2. Cross section of hole #2B, quite close to the location of the drill breakdown, showing similar microstructure as JT8-hub failure. Hardness impressions on the photo represent 53 HRC, 37 HRC and 31 HRC, almost identic 1 0 Adobe PDF file View
150 Photo 3. Cross section of hole #2B quite close to the location of the drill breakdown. Mag. 7-8X. 1 0 Adobe PDF file View
151 Photo 4. Cross section of hole #2B quite close to the location of the drill breakdown showing a surface layer with cracks and a appearance similar to the failed JT8-hub. 1 0 Adobe PDF file View
152 Photo 5. Cross section of hole #2B quite close to the location of the drill breakdown showing a surface layer with an appearance similar to the failed JT8-hub. Mag. 128X. 1 0 Adobe PDF file View
153 Photo 6. Cross section of hole #2B quite close to the location of the drill breakdown showing a surface layer with a apperance similar to the failed JT8-hub. 1 0 Adobe PDF file View
154 Photo 6A. Concentration Profile Sample 2B 1 0 Adobe PDF file View
155 Photo 7. Hole #2 drilled with standard cutting data with HSS. The arrows show BEA indications consisting of impressions of chips smeared on the hole surface. 1 0 Adobe PDF file View
156 Photo 8. Longitudinal section of hole 2 through a BEA indication, arrow A in photo 7. The microstructure showing plastic deformation to a depth of up to 35um (1.38 mills) created by a impression of a chip. Mag. 500X. 1 0 Adobe PDF file View
157 Photo 9. Longitudinal section of hole 2 through a BEA indication, arrow B in photo 7. A chip with deformed microstructure is smeared into the hole surface. Mag. 500X. 1 0 Adobe PDF file View
158 Photo 10. Same as previous. Mag 500X. 1 0 Adobe PDF file View
159 Photo 11. Hole #26 drilled with standard cutting data with HSS and fine bored. No indications came up to view a tBEA. 1 0 Adobe PDF file View
160 Photo 12. Cross section of hole #26 showing deformed material to a depth of up to 12 um (0.47 mills). Mag 500X. 1 0 Adobe PDF file View
161 Photo 13. Hole #25 drilled with standard cutting data with HSS, fine bored and honed. BEA shows no indications. 1 0 Adobe PDF file View
162 Photo 14. Cross section of hole #25 showing deformed material to a depth of 5 um (0.20 mills). Mag 500X. 1 0 Adobe PDF file View
163 Photo 15. Hole adjacent to hole #1A drilled with HSS to failure by increased cutting data and without coolant. BEA has been performed. 1 0 Adobe PDF file View
164 Photo 16. Hole #1A after opening up and BEA. And elliptic cavity can be seen on the ID. The surrounding area of the cavity indicated alternaterly in grey and blue. 1 0 Adobe PDF file View
165 Photo 17. Hole #1A. Longitudinal section showing remelt material with cracks and overheated material (above B-transus) with transformed B. The section is located at arrow A in photo 16. Mag 500X. 1 0 Adobe PDF file View
166 Photo 18. Hole #1A. Longitudinal section of showing overheated material (above B-transus) with transformed B and partially transformed B. The section is located at arrow B in photo 16. Mag 200X 1 0 Adobe PDF file View
167 Photo 19. Hole adjacent to hole #1B drilled with HSS to failure by increased cutting data and without coolant. BEA has been performed. 1 0 Adobe PDF file View
168 Photo 20. Hole #1B after deviding and BEA. The ID exhibit an BEA indication consisting of a mostly blue elliptic spot with surrounding area which indicated alternaterly in grey and blue. Compare with photo 16. 1 0 Adobe PDF file View
169 Photo 21. A close up of the center of the BEA indication in hole #1B. The grey area G is contaminated with iron (Fe) in difference with the blue area B. Notice the crack in the area. 1 0 Adobe PDF file View
170 Photo 22. Hole #57 drilled with increased cutting data with HM to breakdown. The hole has also been fine bored and honed. BEA shows a white-grey indication in the drill breakdown area. 1 0 Adobe PDF file View
171 Photo 23. Hole #57 after reetch. The indication appear blue. 1 0 Adobe PDF file View
172 Photo 24. Cross section of the indication area in hole #57. The microstructure shows deformation to a depth of 0.2 mm (0.0079 inch). Mag. 32X. 1 0 Adobe PDF file View
173 Photo 25. A close up on the indication area in hole #57 in previous photo. During the drill breakdown particles on tungsten (W) have been pressed into the ID. 1 0 Adobe PDF file View
174 Photo 26. The indication area in hole #57. Chemical analysis in SEM areas with iron (Fe) and tungsten (W) have been verified which indicate grey in BEA. 1 0 Adobe PDF file View
175 Photo 27. Hole #52 drilled with increased cutting data with HSS to breakage. The hole has also been fine bored and honed. The hole was blue etched before and after being sectioned into two halfs. 1 0 Adobe PDF file View
176 Photo 28. Microstructure of hole #52 showing deformed and overheated material. Mag. 32X. 1 0 Adobe PDF file View
177 Photo 29. A close up of photo 28. Microstructure of hole #52 showing deformed and overheated material to a depth of 0.6 - 0.7 mm (0.024-0.028 inch). Mag 64X. 1 0 Adobe PDF file View
178 Photo 30. Example of a delta drill used without coolant. A heavy accumulation of chips accured during the testing. 1 0 Adobe PDF file View
179 Correspondence from Patricia Garcia Concerning Delta #1288, Pensacola Accident July 6, 1996 40 0 Adobe PDF file View
180 Pensacola, Florida Safety Recommendation (A-98-9 through -23) 20 0 Adobe PDF file View
181 Douglas Aircraft Company Submission to the NTSB 11 0 Adobe PDF file View
182 (FAA) Titanium Rotating Components Review Team Report 149 0 Adobe PDF file View
183 Correspondence from McDonnell Douglas 1 0 Adobe PDF file View