# NTSB CHI98LA269: Boeing 767-223, N335AA, Peotone, IL, July 22, 1998 - Type: NTSB accident investigation - Classification: Accident · Serious injuries · Limited investigation · Final report - Date: July 22, 1998, 13:45 local (19:45 UTC) - Place: Peotone, IL - Coordinates: 41.330459, -87.789192 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=41.3305&lon=-87.7892&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Serious injuries - Injuries: 1 serious, 1 minor, 135 uninjured - Status: Completed, report July 2, 1999 - Report: Approved by Office Director - NTSB case key (mKey): 43099 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI98LA269 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/43099/pdf - Page: https://openairdocs.org/ntsb/CHI98LA269 ## Probable cause In-flight encounter with turbulence. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Altitude deviation,uncontrolled, climb - to cruise - weather condition - turbulence in clouds (contributing factor) - misc eqpt/furnishings,seat belt - disconnected (cause) ## Analysis Moderate turbulence was encountered as the airplane climbed through FL180 while in the clouds. There were no weather returns indicating turbulence nor were there any reports of turbulence from Air Traffic Control or other airplanes. One flight attendant who was in the aft galley received minor injuries. One passenger received a broken rib when the male portion of her seat belt disconnected from its attach point. The attach point and the latching mechanism were both intact. This passenger was thrown from her seat into the aisle. ## Factual narrative On July 22, 1998, at 1345 central daylight time (cdt), a Boeing 767-223, N335AA, operated by American Airlines as flight #1758, encountered moderate turbulence while climbing through flight level 180 over Peotone, Illinois. The airplane was not damaged. One passenger received serious injuries and one flight attendant received minor injuries. Two cockpit crewmembers, 5 flight attendants and 128 passengers were not injured. The 14 CFR Part 121 flight had departed Chicago's O'Hare International Airport (ORD) with an original destination of Raleigh-Durham, North Carolina. The flight returned to ORD and landed at 1406 cdt following the turbulence encounter. The airplane was in IFR conditions when the encounter occurred. The flight crew reported that while climbing through FL180, approximately 10 mile west of the Peotone VOR, they encountered moderate turbulence for a time period of about 5 seconds. They reported that they were in the clouds, but their weather radar was not showing any returns and there were no reports of turbulence either by air traffic control or by other airplanes in the area. The flight crew reported the seat belt sign was on. Shortly after encountering the turbulence they were informed that the #2 flight attendant and one passenger were injured as a result of the turbulence. The decision was made to return to the O'Hare International Airport. The injured flight attendant reported she was in the rear galley setting up for service when the turbulence was encountered. She reported, "... the back of the airplane swayed harder then usual and I pushed against the counter tops. My first thought was to get to my jumpseat but by the time I could move, we dropped and I flew up and hit my head on the ceiling. I came back down and hit the back side of my right thigh." She stated she eventually got back into her jumpseat. She recalled seeing a deadheading flight attendant helping a female passenger up off the floor. The deadheading flight attendant then provided assistance to her. Both the #2 flight attendant and the injured passenger were transported to the hospital upon landing at O'Hare. The flight attendant was treated and released from the hospital with bruises. The passenger suffered a broken rib. The deadheading flight attendant reported the injured passenger who was in seat 38H, did have her seatbelt fastened, but that the belt "...released below the seat cushion." A maintenance inspection of the seat belt revealed the male portion of the belt disconnected from the attach point. The attach point and the latching mechanism were both intact. A review of the Flight Data Recorder data revealed the airplane experienced vertical accelerations ranging from -0.14g's to 1.429g's during the turbulence encounter. ## Aircraft - Registration: [N335AA](https://openairdocs.org/deregistered/N335AA-2015-12-09), registration cancelled 2015-12-09, S/N 22333, built 1987 (OpenAirDocs) - Reported make and model: Boeing 767-223 - Registry model: [Boeing 767-223](https://openairdocs.org/model/boeing-767-223) (registry code 1385123) (OpenAirDocs) - Registry engine: [GE CF6-80 series](https://openairdocs.org/engine/ge-cf6-80-series) (registry code 30025, turbo-fan) (OpenAirDocs) - Category: Airplane - Serial number: 22333 - Engines: Rolls-Royce RB211 43100 lbs thrust turbo fan - Damage: No damage - Flight: Part 121 - Operator: American Airlines, Inc., doing business as American Airlines - Registered owner: Wilmington Trust Company - Airworthiness certificate: Standard, Transport - Departed: ORD, CHICAGO, IL - Destination: RDU, RALEIGH-DURHAM, NC - Flight plan: IFR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 56; airline transport, flight engineer; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 15,707 total, 557 in this make and model, 8,533 as pilot in command ## Weather - Conditions: Day - Wind: 320° at 9 knots - Visibility: 10 statute miles - Lowest ceiling: 9,500 ft broken - Temperature: 79 °F, dew point 66 °F - Altimeter: 29.00 inHg - Observed at: MDW, 36 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 19980722046529A](https://openairdocs.org/incident/19980722046529A), Jul 22, 1998: Boeing 767223, Peotone, IL. (.4) Moderate turbulence was encountered as the airplane climbed through FL180 while in the clouds. There were no weather returns indicating turbulence nor… ## Other investigations on N335AA (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 LAX96LA222](https://openairdocs.org/ntsb/LAX96LA222), Jun 7, 1996: Boeing 767-223 (N335AA), San Francisco, CA, minor damage. Probable cause: inadequate visual lookout by the United Airlines tug driver during the pushback operation. Contributing factors were: the driver's reduced ability to observe the American B-767 due to the nighttime… 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.