# NTSB CHI99FA163: Cessna 421B, N34TM, Jefferson City, MO, May 27, 1999 - Type: NTSB accident investigation - Classification: Accident · Fatal · Field investigation · Final report - Date: May 27, 1999, 18:26 local (23:26 UTC) - Place: Jefferson City, MO - Location: 38.6143° N, 92.1784° W: Placed by OpenAirDocs from NTSB’s distance and direction from JEFFERSON CITY MEML (JEF), within about a mile (OpenAirDocs) - Nearby events: https://openairdocs.org/map.md?lat=38.6143&lon=-92.1784&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: Fatal - Injuries: 4 fatal - Status: Completed, report August 14, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 46403 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI99FA163 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/46403/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=46403 - Page: https://openairdocs.org/ntsb/CHI99FA163 ## Probable cause the pilot failed to maintain control of the airplane. A factor was the partial loss of power due to the exhaust valve fatigue failure. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(partial) - mech failure/malf, approach - vfr pattern - final approach - engine assembly,valve,exhaust - failure,total (contributing factor) - engine assembly,piston - failure,total - Loss of control - in flight, approach - vfr pattern - final approach - aircraft control - not maintained, pilot in command (cause) - In flight collision with terrain/water, descent - uncontrolled ## Analysis The airplane impacted the ground in a nose low, inverted attitude. The pilot reported, 'Jeff Tower, N34TM, I've just lost power on the right engine, eh, left engine.' The airplane's altitude was approximately 200 to 400 feet when the airplane's wings wobbled back and forth. The airplane's wings banked approximately 90 degrees to the left, and then the airplane nosed over and impacted the ground. White smoke was seen coming from the belly of the airplane for 1 to 2 seconds about 20 seconds prior to it impacting the ground. The terrain was a flat, hard packed field used for growing grass sod. Both the left and right propellers were found 12 to 18 inches under the hard packed soil. Rotational paint transfer patterns from the propeller blades onto the hard packed soil were evident. The left and right propeller blades exhibited chordwise scratching and leading edge polishing. The #2 cylinder piston was broken and the piston pin was still attached to the piston rod. The NTSB Materials Laboratory examination revealed the fracture face of the #2 exhaust valve stem was consistent with a bending fatigue separation. Both #2 and #6 exhaust valve guides showed heavy wear that ovalized the bores. The annual inspection conducted on March 15, 1999, indicated the compression on the left engine was 80/64, 50, 67, 70, 69, and 62. ## Factual narrative HISTORY OF FLIGHT On May 27, 1999, at 1826 central daylight time, a Cessna 421B, N34TM, was destroyed when it impacted the ground approximately 1.6 miles northwest of the approach end of runway 12 at the Jefferson City Memorial Airport, Jefferson City, Missouri. The private pilot and three passengers received fatal injuries. The 14 CFR Part 91 flight had departed Poplar Bluff Municipal Airport (POF), Poplar Bluff, Missouri, at approximately 1730 en route to Jefferson City (JEF), Missouri. Visual meteorological conditions prevailed and the flight was on an IFR flight plan. The airplane was on the final segment of a visual approach to runway 12 when the pilot indicated he had a loss of power. The airplane was seen making a left turn to the northeast. It continued to roll and it impacted the ground in a nose low, inverted attitude. Records indicate the pilot contacted the Federal Aviation Administration's (FAA) St. Louis Automated Flight Service Station (AFSS) at 1711 to obtain a weather brief and file a flight plan. The filed flight plan showed the flight was a direct flight from POF direct to JEF with a time en route of 45 minutes. Fuel on board was listed as 4.5 hours. At 1820:09, N34TM contacted the JEF control tower. N34TM had been given a visual approach to runway 12 by approach control, and was instructed by the JEF control tower to enter the right traffic pattern for runway 12. At 1823:24, N34TM reported entering the right downwind for runway 12. N34TM was sequenced as the number two aircraft for landing. At 1824:20, N34TM acknowledged that he was cleared to land. At 1825:47, N34TM reported, "Jeff Tower, N34TM, I've just lost power on the right engine, eh, left engine." No further radio transmissions were made by N34TM to the tower. Witnesses reported seeing the airplane flying toward the airport. Then they reported seeing the airplane turn left to the north as it passed over highway 63. The witnesses reported the airplane's altitude was approximately 200 to 400 feet. They reported seeing the airplane's wings rock back and forth. They reported seeing the airplane wings banked approximately 90 degrees to the left. Then the airplane nosed over and impacted the ground. One witness reported seeing white smoke coming from the belly of the airplane for one to two seconds. He reported seeing the airplane's wings wobble before it went into the sharp left bank. He reported it was approximately 20 seconds from the time that he saw the white smoke until it impacted the ground. He reported the landing gear was not extended. One witness reported that he heard power being applied to the engines. He reported the airplane was in a left bank, and then it entered a "drastic upward climb" before nosing over and going straight down. He reported that he thought both engines were running. The JEF airport manager, who was in the control tower at the time of the accident, reported the airplane, "... appeared to be north of the extended centerline and proceeding northbound at a low altitude. The aircraft appeared to be in a shallow left bank, and was approximately 1 mile northwest of the airport. The aircraft also appeared to level out once, but then returned to the shallow left turn, and continued to lose altitude. Within a few seconds the aircraft suddenly rolled into a steep left turn, (approximately 90 degrees) the nose pointed down to vertical, and the aircraft descended behind the treeline. We then observed smoke from that location." The witnesses reported the airplane burst into flames immediately after impacting the ground. PERSONNEL INFORMATION The pilot was a private pilot with single and multi-engine land ratings, and an instrument rating. He held a Third Class medical certificate. The pilot's flight logbook was not obtained. An insurance form dated March 9, 1999, indicated the pilot had approximately 1,850 hours of total flight time and 850 hours of time in make and model aircraft. The pilot purchased N34TM in 1997. The total hours on the airplane when he purchased the airplane was approximately 5303 hours. The airplane had been flown approximately 227 hours since the pilot purchased the airplane. AIRCRAFT INFORMATION The airplane was a twin engine Cessna 421B, serial number 421B-0965. The airplane seated eight and had a maximum gross weight of 7,450 pounds. The engines were 375 horsepower Continental GTSIO-520-H engines. The last annual inspection was conducted on March 15, 1999. The airplane had flown about 35 hours since the last inspection and had a total time of about 5,530 hours. The annual inspection conducted on March 15, 1999, indicated the compression on the left engine was 80/64, 50, 67, 70, 69, and 62. The right engine compression was 80/64, 64, 71, 62, 66, and 68. The left propeller logbook indicated that on May 18, 1999, the left propeller was removed from the left engine for repair. The logbook indicated that nicks to one of the blades were filed and the propeller was balanced. The propeller was re-installed on the airplane on May 24, 1999. METEOROLOGICAL INFORMATION The JEF weather at 1753 was reported as: Winds 000 at 6 knots, sky clear, visibility 10 miles, temperature 74 degrees Fahrenheit, dew point 46 degrees Fahrenheit, altimeter 30.10. WRECKAGE AND IMPACT INFORMATION The aircraft wreckage was located at coordinates N 42 degrees 36.786 minutes, W 92 degrees, 10.651 minutes. The location was approximately 1.6 nautical miles and 324 degrees from the approach end of runway 12. The terrain was a flat, hard packed field used for growing grass sod. The direction of the wreckage path was about 355 degrees. (See Wreckage Diagram and Photographs) The left and right propellers were located at the initial impact site and were found on a line perpendicular to the wreckage path. The left propeller was found on the right side of the wreckage path, and the right propeller was found on the left side of the wreckage path. Both the left and right propellers were found 12 to 18 inches under the hard packed soil. Rotational paint transfer patterns from the propeller blades onto the hard packed soil were evident. The left propeller blades exhibited chordwise scratching and leading edge polishing. The #3 blade exhibited blade polishing for more than a fourth of the blade. The #2 and #3 blade were bent aft. The right propeller blades exhibited chordwise scratching and the #2 and #3 blades were bent aft. The #1 blade tip was curled aft with a slight bend aft. Both #2 and #3 blades exhibited blade polishing. The fuselage, cockpit, and the left and right wings were destroyed by fire. All flight controls were found attached to their respective hinges. Control cables were traced throughout the wreckage to their respective hinges. Cable fractures exhibited "broom straw" features. The left and right wingtip fuel tanks had impacted the terrain on the same line as the propellers. Fan shaped burn patterns in the direction of the wreckage path emanated from the impact marks made by the wingtip fuel tanks. The on-site examination of the left engine revealed that the number two cylinder spark plugs' electrodes were damaged. The number two cylinder piston was broken and the piston pin was still attached to the piston rod. MEDICAL AND PATHOLOGICAL INFORMATION The autopsy on the pilot was performed at Office of the Medical Examiner, Columbia, Missouri. A Forensic Toxicology Fatal Accident Report was prepared by the FAA Civil Aeromedical Institute. The report indicated the following results: Carbon monoxide: Not performed Cyanide: Not performed No Ethanol detected in urine. Ephedrine detected in liver fluid. Pseudoephedrine detected in liver fluid. Phenylopropanolamine detected in liver fluid. Ephedrine detected in urine. Pseudoephedrine detected in urine. Phenylpropanolamine detect ## Aircraft - Registration: [N34TM](https://openairdocs.org/deregistered/N34TM-2000-05-01), registration cancelled 2000-05-01, S/N 421B0965 (OpenAirDocs) - Reported make and model: Cessna 421B - Registry model: [Cessna 421B](https://openairdocs.org/model/cessna-421b) (registry code 2076014) (OpenAirDocs) - Category: Airplane - Serial number: 421B-0965 - Airframe hours: 5530 - Engines: Continental GTSIO-520-H 375 horsepower reciprocating - Damage: Destroyed - Fire: On-Ground - Flight: Business, Part 91 - Registered owner: Robert E. Linville - Airworthiness certificate: Standard, Normal - Last inspection: Annual, March 15, 1999, 35 hours before - Departed: POF, POPLAR BLUFF, MO - Destination: JEF - Flight plan: IFR - Airport: JEF, Jefferson City Memorial, runway 12, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 43; private; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; seat: left; toxicology performed; flight hours: 1,850 total, 850 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: 0° at 6 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 73 °F, dew point 46 °F - Altimeter: 30.00 inHg - Observed at: JEF, 1 nm away ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 19990527005849A](https://openairdocs.org/incident/19990527005849A), May 27, 1999: Cessna 421B, Jefferson City, MO, Destroyed, 4 fatal. Acft was on base leg turning for final approach when it lost left engine power, rolled over, and crashed in a nose-down attitude, all 4 POB suffered fatal… ## Docket (41 files) The files NTSB released with the investigation on May 31, 2000, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=46403. 20.0 MB in all. - Supplement A (item 1, .PDF, 250 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123699&FileExtension=.PDF&FileName=Supplement%20A-Master.PDF - Supplement B (item 2, .PDF, 389 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123700&FileExtension=.PDF&FileName=Supplement%20B-Master.PDF - Supplement S (item 3, .PDF, 77 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123701&FileExtension=.PDF&FileName=Supplement%20S-Master.PDF - Materials Laboratory Factual Report (item 4, .PDF, 21 photos, 3.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413832&FileExtension=.PDF&FileName=Materials%20Laboratory%20Factual%20Report-Redacted.PDF - Witness Statement and Record of Interviews (item 5, .PDF, 402 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413833&FileExtension=.PDF&FileName=Witness%20Statement%20and%20Record%20of%20Interviews-Redacted.PDF - Map of Accident Area and Wreckage Diagrams (item 6, .PDF, 148 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413834&FileExtension=.PDF&FileName=Map%20of%20Accident%20Area%20and%20Wreckage%20Diagrams-Redacted.PDF - FAA Report (item 7, .PDF, 737 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413835&FileExtension=.PDF&FileName=FAA%20Report-Redacted.PDF - Callaway County Sheriff's Office Report (item 8, .PDF, 906 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413836&FileExtension=.PDF&FileName=Callaway%20County%20Sheriff%27s%20Office%20Report-Redacted.PDF - Fuel Sample Results (item 9, .PDF, 184 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413837&FileExtension=.PDF&FileName=Fuel%20Sample%20Results-Redacted.PDF - Teledyne Continental Motors Airsafety Investigation Report (item 10, .PDF, 483 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413838&FileExtension=.PDF&FileName=Teledyne%20Continental%20Motors%20Airsafety%20Investigation%20Report-Redacted.PDF - Allied Signal Aerospace Teardown Report (item 11, .PDF, 597 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123709&FileExtension=.PDF&FileName=Allied%20Signal%20Aerospace%20Teardown%20Report-Master.PDF - McCauley Propeller Systems Teardown Report (item 12, .PDF, 99 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413839&FileExtension=.PDF&FileName=McCauley%20Propeller%20Systems%20Teardown%20Report-Redacted.PDF - Aircraft Logbooks (item 13, .PDF, 8.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413840&FileExtension=.PDF&FileName=Aircraft%20Logbooks-Redacted.PDF - N34TM Logbook Entries Maintained by Devine Aircraft Engines, Inc. (item 14, .PDF, 77 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413841&FileExtension=.PDF&FileName=N34TM%20Logbook%20Entries%20Maintained%20by%20Devine%20Aircraft%20Engines,%20Inc.-Redacted.PDF - Insurance Policy Indicating Pilots Flight Time (item 15, .PDF, 108 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413842&FileExtension=.PDF&FileName=Insurance%20Policy%20Indicating%20Pilots%20Flight%20Time-Redacted.PDF - Metallurgical Analysis of Superior Piston (item 16, .PDF, 56 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413843&FileExtension=.PDF&FileName=Metallurgical%20Analysis%20of%20Superior%20Piston-Redacted.PDF - Statement of Party Representatives to NTSB Investigation (item 17, .PDF, 537 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413844&FileExtension=.PDF&FileName=Statement%20of%20Party%20Representatives%20to%20NTSB%20Investigation-Redacted.PDF - Release of Aircraft Wreckage, NTSB Form 6120.15 (item 18, .PDF, 217 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413845&FileExtension=.PDF&FileName=Release%20of%20Aircraft%20Wreckage,%20NTSB%20Form%206120.15-Redacted.PDF - Toxicological Report (item 19, .PDF, 77 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413846&FileExtension=.PDF&FileName=Toxicological%20Report-Redacted.PDF - Correspondence and Copy of Wreckage Release Form (item 20, .PDF, 303 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40413847&FileExtension=.PDF&FileName=Correspondence%20and%20Copy%20of%20Wreckage%20Release%20Form-Redacted.PDF - Photo 1. View of Wreckage Path Heading 355 Degrees. Note the Burn Residue on the Ground Spreading Out From the Wingtip Tanks. (item 21, .PDF, 67 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123718&FileExtension=.PDF&FileName=Photo%201.%20%20View%20of%20Wreckage%20Path%20Heading%20355%20Degrees.%20%20Note%20the%20Burn%20Residue%20on%20the%20Ground%20Spreading%20Out%20From%20the%20Wingtip%20Tanks.-Master.PDF - Photo 2. View of Wreckage Path Heading 355 Degrees. The Right Propeller is on the Left and the Left Propeller is on the Right of the Photograph. (item 22, .PDF, 76 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123719&FileExtension=.PDF&FileName=Photo%202.%20%20View%20of%20Wreckage%20Path%20Heading%20355%20Degrees.%20%20The%20Right%20Propeller%20is%20on%20the%20Left%20and%20the%20Left%20Propeller%20is%20on%20the%20Right%20of%20the%20Photograph.-Master.PDF - Photo 3. View of Initial Impact Looking to the Northwest. The Aircraft Impacted Inverted. Note the Right Wingtip, Right Propeller, Nose Ground Scar, Left Propeller, and Left Wingtip Impact Marks. (item 23, .PDF, 82 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123720&FileExtension=.PDF&FileName=Photo%203.%20%20View%20of%20Initial%20Impact%20Looking%20to%20the%20Northwest.%20%20The%20Aircraft%20Impacted%20Inverted.%20%20Note%20the%20Right%20Wingtip,%20Right%20Propeller,%20Nose%20Ground%20Scar,%20Left%20Propeller,%20and%20Left%20Wingtip%20Impact%20Marks.-Master.PDF - Photo 4. View of the Right Wing, Right Engine, and Cabin. The Left Wing and Fuselage in Background. (item 24, .PDF, 106 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123721&FileExtension=.PDF&FileName=Photo%204.%20%20View%20of%20the%20Right%20Wing,%20Right%20Engine,%20and%20Cabin.%20%20The%20Left%20Wing%20and%20Fuselage%20in%20Background.-Master.PDF - Photo 5. View of the Cockpit and Cabin From the Rear of the Aircraft. Note the Left Wing on the Left of the Photograph. (item 25, .PDF, 116 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123722&FileExtension=.PDF&FileName=Photo%205.%20%20View%20of%20the%20Cockpit%20and%20Cabin%20From%20the%20Rear%20of%20the%20Aircraft.%20%20Note%20the%20Left%20Wing%20on%20the%20Left%20of%20the%20Photograph.-Master.PDF - Photo 6. Left Wing and Left Nacelle. The Left Wing Outboard of the Nacelle is Visible Bent Back from the Nacelle. (item 26, .PDF, 102 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123723&FileExtension=.PDF&FileName=Photo%206.%20%20Left%20Wing%20and%20Left%20Nacelle.%20%20The%20Left%20Wing%20Outboard%20of%20the%20Nacelle%20is%20Visible%20Bent%20Back%20from%20the%20Nacelle.-Master.PDF - Photo 7. View of Left Wing, Left Nacelle, and Left Engine. (item 27, .PDF, 114 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123724&FileExtension=.PDF&FileName=Photo%207.%20%20View%20of%20Left%20Wing,%20Left%20Nacelle,%20and%20Left%20Engine.-Master.PDF - Photo 8. View of Left Engine Upside Down on the Ground. Note the Oil Pan Had Exhibited Fire Damage and Melting. (item 28, .PDF, 121 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123725&FileExtension=.PDF&FileName=Photo%208.%20%20View%20of%20Left%20Engine%20Upside%20Down%20on%20the%20Ground.%20%20Note%20the%20Oil%20Pan%20Had%20Exhibited%20Fire%20Damage%20and%20Melting.-Master.PDF - Photo 9. View of the Cabin, Fuselage, and Tailcone. (item 29, .PDF, 130 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123726&FileExtension=.PDF&FileName=Photo%209.%20%20View%20of%20the%20Cabin,%20Fuselage,%20and%20Tailcone.-Master.PDF - Photo 10. View of the Empennage. Note the Displacement of the Rudder and Elevator Trim. (item 30, .PDF, 71 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123727&FileExtension=.PDF&FileName=Photo%2010.%20%20View%20of%20the%20Empennage.%20%20Note%20the%20Displacement%20of%20the%20Rudder%20and%20Elevator%20Trim.-Master.PDF - Photo 11. Right Engine. (item 31, .PDF, 122 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123728&FileExtension=.PDF&FileName=Photo%2011.%20%20Right%20Engine.-Master.PDF - Photo 12. View of Right Turbocharger in Wreckage. (item 32, .PDF, 107 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123729&FileExtension=.PDF&FileName=Photo%2012.%20%20View%20of%20Right%20Turbocharger%20in%20Wreckage.-Master.PDF - Photo 13. View of Right Engine Nacelle, Right Wing, and Right Engine. (item 33, .PDF, 112 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123730&FileExtension=.PDF&FileName=Photo%2013.%20%20View%20of%20Right%20Engine%20Nacelle,%20Right%20Wing,%20and%20Right%20Engine.-Master.PDF - Photo 14. Right Propeller and Ground Scar. (item 34, .PDF, 93 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123731&FileExtension=.PDF&FileName=Photo%2014.%20%20Right%20Propeller%20and%20Ground%20Scar.-Master.PDF - Photo 15. Closer View of Right Propeller Ground Scar. (item 35, .PDF, 93 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123732&FileExtension=.PDF&FileName=Photo%2015.%20%20Closer%20View%20of%20Right%20Propeller%20Ground%20Scar.-Master.PDF - Photo 16. Left Propeller and Ground Scar. (item 36, .PDF, 104 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123733&FileExtension=.PDF&FileName=Photo%2016.%20%20Left%20Propeller%20and%20Ground%20Scar.-Master.PDF - Photo 17. Right Propeller After Ground Extraction. (item 37, .PDF, 104 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123734&FileExtension=.PDF&FileName=Photo%2017.%20%20Right%20Propeller%20After%20Ground%20Extraction.-Master.PDF - Photo 18. Left Propeller After Ground Extraction. (item 38, .PDF, 102 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123735&FileExtension=.PDF&FileName=Photo%2018.%20%20Left%20Propeller%20After%20Ground%20Extraction.-Master.PDF - Photo 19. Right Turbocharger. (item 39, .PDF, 103 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123736&FileExtension=.PDF&FileName=Photo%2019.%20%20Right%20Turbocharger.-Master.PDF - Photo 20. Right Engine Exhaust Duct. (item 40, .PDF, 92 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123737&FileExtension=.PDF&FileName=Photo%2020.%20%20Right%20Engine%20Exhaust%20Duct.-Master.PDF - Photo 21. Left Engine #2 Cylinder Top and Bottom Spark Plugs. (item 41, .PDF, 38 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40123738&FileExtension=.PDF&FileName=Photo%2021.%20%20Left%20Engine%20%232%20Cylinder%20Top%20and%20Bottom%20Spark%20Plugs.-Master.PDF From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.