# NTSB ANC07LA008: Boeing 747-228F, N752SA, Anchorage, AK, December 24, 2006 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: December 23, 2006, 21:45 local (Dec 24, 2006, 01:45 UTC) - Place: Anchorage, AK - Coordinates: 61.174446, -149.996383 - Nearby events: https://openairdocs.org/map.md?lat=61.1744&lon=-149.9964&mi=10 - Phase of flight: [Standing](https://openairdocs.org/ntsb-phases/150) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 3 uninjured - Status: Completed, report August 30, 2007 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - Parties: Achorage FSDO-03 - NTSB case key (mKey): 65080 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC07LA008 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/65080/pdf - Page: https://openairdocs.org/ntsb/ANC07LA008 ## Probable cause The failure of the deicing truck crew to maintain sufficient distance from the parked airplane during deicing, which resulted in a collision and substantial damage to the airplane. ## Analysis The flight crew departed on an instrument flight rules (IFR) non-scheduled domestic cargo flight under Title 14, CFR Part 121. When the cabin failed to pressurize during departure, the airplane returned to the airport. An FAA inspector who examined the airplane reported that maintenance personnel found a penetrating gouge in the right lower portion of the fuselage between the wing and tail, near the cargo door. The inspector indicated that the gouge was 18 inches long, 1 to 2 inches wide, with other, shallower surface skin damage about 3 feet long, and that the damage was consistent with the size and shape of the counter-balance weight on the truck used to deice the airplane. ## Factual narrative On December 23, 2006, about 2145 Alaska standard time, a Boeing 747-228F airplane, N752SA, sustained substantial damage when it was struck by a deicing truck during deicing at the Ted Stevens Anchorage International Airport, Anchorage, Alaska. The flight crew was aboard preparing the airplane for flight. The airplane was being operated as Flight 996, by Southern Air Inc., Norwalk, Connecticut, as an instrument flight rules (IFR) non-scheduled domestic cargo flight under Title 14, CFR Part 121, when the accident occurred. The three flight crew members were not injured. Instrument meteorological conditions prevailed, and an instrument flight plan was filed. The airplane departed Anchorage about 0030, and was bound for Dallas, Texas, but returned when the crew was unable to pressurize the cabin. During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) on December 26, the FAA inspector who examined the airplane, reported that after the airplane departed Anchorage, the flight crew discovered that the cabin would not pressurize, and they returned to Anchorage and landed. The inspector said during an inspection of the airplane, maintenance personnel found a penetrating gouge in the right lower portion of the fuselage between the wing and tail, near the cargo door. The inspector indicated that the penetrating gouge was 18 inches long, 1 to 2 inches wide, with other, shallower surface skin damage about 3 feet long. He said the damage was consistent with the size and shape of the counter-balance weight on the truck used to deice the airplane. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - On ground/water collision with object, standing - engine(s) not operating - fuselage - punctured - object - aircraft parked/standing - object - vehicle - clearance - not maintained, ground personnel (cause) - airport equipment,ground support - airport facilities,runway/landing area condition - hard/paved surface ## Aircraft - Registration: [N752SA](https://openairdocs.org/deregistered/N752SA-2014-09-03), registration cancelled 2014-09-03, S/N 21255, built 1976 (OpenAirDocs) - Reported make and model: Boeing 747-228F - Registry model: [Boeing 747-228F](https://openairdocs.org/model/boeing-747-228f) (registry code 1384895) (OpenAirDocs) - Registry engine: [GE CF6-50 series](https://openairdocs.org/engine/ge-cf6-50-series) (registry code 30018, turbo-fan) (OpenAirDocs) - Category: Airplane - Serial number: 21255 - Airframe hours: 121459 - Engines: General Electric CF6-E2 51800 lbs thrust turbo fan - Damage: Substantial damage - Flight: Part 121 - Registered owner: Southern Air Inc - Airworthiness certificate: Standard, Normal - Last inspection: Continuous airworthiness, December 1, 2006 - Departed: PANC, Anchorage, AK - Destination: DFW, Dallas, TX - Flight plan: IFR - Airport: ANC, Ted Stevens Anchorage Internat ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 42; injuries: none; airline transport, flight instructor, commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, with waivers/limitations; last flight review September 1, 2006; seat: left; flight hours: 9,327 total, 1,942 in this make and model, 4,956 as pilot in command, 166 in the last 90 days, 61 in the last 30 days, 2 in the last 24 hours - Co-pilot; age 35; injuries: none; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, without waivers/limitations; last flight review March 1, 2006; seat: left; flight hours: 6,421 total, 421 in this make and model, 363 as pilot in command, 176 in the last 90 days, 49 in the last 30 days, 2 in the last 24 hours - Flight engineer; injuries: none; last flight review March 1, 2006; seat: rear ## Weather - Conditions: Instrument (IMC), Night/dark - Wind: 170° at 3 knots - Visibility: 1 statute miles - Lowest ceiling: 400 ft - Temperature: 19 °F, dew point 23 °F - Altimeter: 29.42 inHg - Observed at: PANC ## 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 20061224027299A](https://openairdocs.org/incident/20061224027299A), Dec 24, 2006: Boeing 747228F, Anchorage, AK, Substantial damage. (-23) Immediately after southern air flight SO0966 departed Anchorage, Alaska the crew declared an emergency due to a pressurization problem, dumped fuel, and… From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date; 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.