# NTSB DEN01IA036: McDonnell Douglas MD-90-30, N909DA, Salt Lake City, UT, December 30, 2000 - Type: NTSB incident investigation - Classification: Incident · No injuries · Incident investigation · Final report - Date: December 30, 2000, 08:08 local (15:08 UTC) - Place: Salt Lake City, UT - Location: 40.7884° N, 111.9778° W: Placed by OpenAirDocs at SALT LAKE CITY INTL (SLC), within about a mile (OpenAirDocs) - Nearby events: https://openairdocs.org/map.md?lat=40.7884&lon=-111.9778&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 80 uninjured - Status: Completed, report September 27, 2001 - Report: Approved by Office Director - Parties: Federal Aviation Administration - NTSB case key (mKey): 50862 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN01IA036 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/50862/pdf - Page: https://openairdocs.org/ntsb/DEN01IA036 ## Probable cause the captain's failure to maintain the proper glide path. Contributing factors were the weather conditions that included low visibility and fog. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - In flight collision with object, approach - faf/outer marker to threshold (ifr) - proper glidepath - not maintained, pilot in command (cause) - weather condition - obscuration (contributing factor) - weather condition - fog (contributing factor) ## Analysis The captain's first approach briefing was based on an ATIS report, indicating a CAT III ILS approach to runway 16R could be expected. When descent instructions were given, however, the descent profile was for landings to the north and this was confirmed by a revised ATIS information. The captain, who was flying the airplane, briefed the first officer for a second time for a CAT III approach to runway 34R. Improved RVR made a Category I approach feasible, and the decision was made to execute this approach. The captain said he acquired the approach lights 100 feet above minimums, and saw the threshold and runway when the airplane arrived at minimums. He disconnected the autopilot. As he began to flare, the first officer announced that sink rate was increasing. The captain attempted to increase pitch. Touchdown was "firm but not hard and rollout was normal." Upon reaching the gate, the captain notified the control tower that he had "possibly touched down short of the runway." An airport operations vehicle reported observing an MD-90 land "prior to the numbers but had not touched down in the over run." Subsequent inspection revealed debris on runway 34R. The airplane struck the approach lights 400 feet short of the runway. Two threshold lights and one light each from the 100 foot and 200 foot approach light bars were found knocked off. The airplane sustained damage to the left main wheel splash guard, and one tire was cut. A one-inch square piece of metal was lodged in the left engine noise suppression material, and there was some damage to the left engine first stage fan section. At the time of the incident, Automatic Terminal Information Service (ATIS) Sierra was current: WIND, 330 degrees at 5 knots; VISIBILITY, less than 1/4-mile, freezing fog; SKY CONDITION, indefinite ceiling 100 feet; TEMPERATURE, -6 degrees Celsius; DEW POINT, -7 degrees Celsius; ALTIMETER, 30.24 inches of mercury; REMARKS, fog dispersal ongoing. ## Factual narrative On December 30, 2000, at 0808 mountain standard time, a McDonnell Douglas MD-90-30, N909DA, operated by Delta Air Lines, Inc., of Atlanta, Georgia, as flight 1147, sustained minor damage when it struck approach lights while landing at Salt Lake City International Airport, Salt Lake City, Utah. The airline transport rated captain and first officer, 3 flight attendants, and 75 passengers were not injured. Instrument meteorological conditions prevailed, and an IFR flight plan had been filed for the scheduled domestic passenger flight operating under Title 14 CFR Part 121. The flight originated at Kansas City, Missouri, at 0618 central standard time. According to the captain's incident report, the first approach briefing was made when ATIS (Automatic Terminal Information Service) indicated that a CAT (category) III ILS (instrument landing system) to runway 16R could be expected. When descent instructions were given, however, the descent profile was for landings to the north and this was confirmed by a revised ATIS information. The captain, who was flying the airplane, briefed the first officer for a second time, this time for a CAT III approach to runway 34R. Improved RVR (runway visual range) values indicated a Category I approach was feasible, and the decision was made to execute this approach. In his written statement that captain said, "At approximately 100 feet above minimums, I acquired the approach lights and by minimums I had acquired both the threshold and the runway. I disconnected the autopilot. As I began to initiate the flare, (the first officer) announced that sink rate was increasing. I crosschecked that my airspeed was correct and attempted to increase my pitch. Touchdown was firm but not hard and rollout was normal." Upon reaching the gate, the captain notified the control tower that he had "possibly touched down short of the runway." An airport operations vehicle reported observing an MD-90 land "prior to the numbers but had not touched down in the over run." Subsequent inspection revealed debris on runway 34R. According to airport personnel, the airplane struck the approach lights 400 feet short of the runway. Two threshold lights and one light each from the 100 foot and 200 foot approach light bars were found knocked off. Examination of the airplane disclosed damage to the left main wheel splash guard, and one of the tires was cut. A one-inch square piece of metal was found lodged in the left engine noise suppression material, and there was some damage to the left engine first stage fan section. The flight data recorder was sent to NTSB's Vehicle Recorder Division for readout. The Flight Data Recorder Factual Report is available in the public docket for this incident. Some of the findings of the report were: 1. Between 0758:50 and about 0800:30, the maximum glide slope deviation was -0.14 dots. 2. At 0800:32, the autopilot was disconnected. 3. At 0800:33, the control columns moved forward (-2.04 and -1.99 degrees, respectively) and the left and right elevators moved down (-3.53 and -2.90 degrees, respectively). 4. At 0800:39, nose down pitch was at its maximum (-1.23 degrees). 5. Glide slope warning occurred at 0800:41. 6. At 0800:44, nose up pitch (landing flare) was at its maximum (+5.45 degrees). 7. Weight on wheels (touchdown) on the left, right, and nose landing gears occurred at 0800:46, 0800:46, and 0800:48, respectively. Since electrical power was not interrupted after the incident and circuit breakers were not opened after the incident, the cockpit voice recorder was not retrieved because, being a closed loop 30 minute system, pertinent conversation would have been erased. At the time of the incident, Automatic Terminal Information Service (ATIS) Sierra was current: WIND, 330 degrees at 5 knots; VISIBILITY, less than 1/4-mile, freezing fog; SKY CONDITION, indefinite ceiling 100 feet; TEMPERATURE, -6 degrees Celsius; DEW POINT, -7 degrees Celsius; ALTIMETER, 30.24 inches of mercury; REMARKS, fog dispersal ongoing. ## Aircraft - Registration: [N909DA](https://openairdocs.org/deregistered/N909DA-2022-12-30), registration cancelled 2022-12-30, S/N 53389, built 1995 (OpenAirDocs) - Reported make and model: McDonnell Douglas MD-90-30 - Registry model: [Mcdonnell Douglas MD-90-30](https://openairdocs.org/model/mcdonnell-douglas-md-90-30) (registry code 3023690) (OpenAirDocs) - Registry engine: [IAE V2500SERIES](https://openairdocs.org/engine/iae-v2500series) (registry code 34601, turbo-jet) (OpenAirDocs) - Category: Airplane - Serial number: 53389 - Airframe hours: 16411 - Engines: Int'l Aero En V2528D5 25000 lbs thrust turbo fan - Damage: Minor damage - Flight: Part 121 - Registered owner: Delta Air Lines, Inc. - Airworthiness certificate: Standard, Transport - Last inspection: Continuous airworthiness, December 29, 2000, 3 hours before - Departed: MCI, Kansas City, MO - Destination: SLC, Salt Lake City, UT - Flight plan: IFR - Airport: SLC, Salt Lake City International, runway 34R, 12,004 × 150 ft, concrete ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 52; injuries: none; airline transport; medical: class 1, valid medical--no waivers/lim.; last flight review April 14, 2000; seat: left; flight hours: 18,000 total, 5,410 in this make and model, 85 in the last 90 days, 14 in the last 24 hours - Co-pilot; age 50; injuries: none; commercial; medical: class 1, valid medical--w/ waivers/lim; seat: right; flight hours: 7,500 total, 169 in the last 90 days, 14 in the last 24 hours - Co-pilot; age 50; injuries: none; flight engineer; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; last flight review May 25, 2000; seat: right; flight hours: 7,500 total, 1,758 in this make and model, 169 in the last 90 days, 14 in the last 24 hours ## Weather - Conditions: Instrument (IMC), Day - Wind: calm - Visibility: 0.25 statute miles - Lowest ceiling: 100 ft overcast - Temperature: 19 °F, dew point 18 °F - Altimeter: 30.23 inHg - Observed at: SLC ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Incident 20001230026629I](https://openairdocs.org/incident/20001230026629I), Dec 30, 2000: Doug MD9030, Salt Lake City, UT, Minor damage. (-23) At 08:10 MST on 12/3/00 at slc a dala #1147 MD-90 (N909DL) landed at least 200 feet short of the threshold of rwy 34R during an ILS approach I n low IMC… ## Other investigations on N909DA (1) 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. - [NTSB WPR10LA044](https://openairdocs.org/ntsb/WPR10LA044), Nov 2, 2009: Mcdonnell Douglas MD-90-30 (N909DA), Phoenix, AZ, substantial damage. Probable cause: An in-flight collision with birds. 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.