Individually Owned: 150,657
Corporate Owned: 137,281
O'hare International Airport
Aircraft Accident/Incident Report
Wood Dale, Illinois 60191
Tuesady, October 17, 2000 13:20 CDT
NTSB Narrative Summary Released at Completion of Accident
A U. S. Marshals Service employee, who was seated on the left side, middle section of the airplane's passenger cabin, said, "I was observing the ground area looking down and aft across the wing. The wing flaps were partially deployed when I observed a large piece of the flap area to rise and leave the a/c and disappear. The flaps continued down and I could not see the particular area the piece left from, from my position any longer." On landing, it was discovered that a 6-foot long, 16-inch wide outboard section of the aft segment of the left inboard, segmented fowler flap was missing. The segment was located at a residence 2 miles west of the airport. An examination of the flap segment revealed that the anodized layer was incomplete on the segment spar and a required oxide layer was not present. The area showed corrosion and the degrading of the bond resulting in separation between the honeycomb and the aft side of the segment spar. The flap segment had been in service since its overhaul in October 1993 and had approximately 5,000 hours. Overhaul facility instructions did not specify a maximum area of the flap segment's honeycomb core that could be debonded during the overhaul. Manufacturer's repair manuals did specify a maximum size for repair of the honeycomb core in the inboard and outboard trailing edge fore flap, but none of the figures in the manual that was in effect at the time of the overhaul covered repair to the honeycomb core for the aft flap segment. A current version of the manufacturer's repair manuals specifies the maximum size for the repair of the trailing edge aft flap segment that includes the honeycomb core.
NTSB Probable Cause Narrative
Inadequate overhaul of the flap segment that allowed for corrosion and debonding that resulted in the flap segment departing the airplane during the approach. Factors relating to this incident were insufficient information provided to the overhaul facility by the airplane manufacturer.
Event Information
| Type of Event | Incident |
| Event Date | 10/17/2000 |
| Event Day of the Week | Tuesday |
| Time of Event | 1320 |
| Event Time Zone | Central Daylight Time |
| Event City | WOOD DALE |
| Event State | ILLINOIS |
| Event Country | -- |
| Zipcode of the event site | 60191 |
| Event Date Year | 2000 |
| Event Date Month | 10 |
| MidAir Collision Indicator | No |
| On Ground Collision occurred ? | No |
| Event Location Latitude | -- |
| Event Location Longitude | -- |
| Event Location Airport | O'Hare International Airport |
| Event Location Nearest Airport ID | ORD |
| Indicates whether the acc/inc occurred off or on an airport | Off Airport/Airstrip |
| Distance from airport in statute miles | 3 |
| Degrees magnetic from airport | 270 |
| Airport Elevation | 668 |
| Weather Briefing Completeness | Not pertinent |
| Investigator's weather source | Weather Observation Facility |
| Time of the weather observation | 1256 Central Daylight Time |
| Direction of event from weather observation facility (degrees) | 90 |
| Weather Observation Facility ID | ORD |
| Elevation of weather observation facility | 668 |
| Distance of event from weather observation facility (units?) | 3 |
| Time Zone of the weather observation | CDT |
| Lighting Conditions | Not Reported |
| Lowest Ceiling Height | 9500 |
| Lowest Non-Ceiling Height | 3300 |
| Sky/Lowest/Cloud Conditions | Scattered |
| Sky Condition for Lowest Ceiling | Broken |
| Visibility Runway Visual Range (Feet) | 0 |
| Visibility Runway Visual Value (Statute Miles) | 0 |
| Visibility (Statute Miles) | 10 |
| Air Temperature at event time (in degrees celsius) | 16 |
| Dew Point at event time (in degress fahrenheit) | 6 |
| Wind Direction (degrees magnetic) | 330 |
| Variable Wind Indicator | Wind direction could be determined |
| Wind Speed (knots) | 4 |
| Wind Velocity Indicator | -- |
| Wind Gust Indicator | Not Gusting |
| Wind Gust (knots) | -- |
| Altimeter Setting at event time (in. Hg) | 30 |
| Density Altitude (feet) | 610 |
| Intensity of Precipitation | -- |
| METAR weather report | -- |
| Event Highest Injury | None |
| On Ground, Fatal Injuries | 0 |
| On Ground, Minor Injuries | 0 |
| On Ground, Serious Injuries | 0 |
| Injury Total Fatal | -- |
| Injury Total Minor | -- |
| Injury Total None | 108 |
| Injury Total Serious | -- |
| Injury Total All | -- |
| Investigating Agency | NTSB |
| NTSB Docket Number (internal use) | 12240 |
| NTSB Notification Source | FAA |
| NTSB Notification Date | Oct 17 2000 12:00AM |
| NTSB Notification Time | 1352 |
| Fiche Number and/or location -used to find docket information | DMS |
| Date of most recent change to record | Sep 10 2002 8:12AM |
| User who most recently changed record | NTSB\MONR |
| Basic weather conditions | Visual Meteorological Cond |
| FAA District Office | -- |
Aircraft Involved |
|
|---|---|
Aircraft #1 |
|
| Aircraft Registration Number | N530KF |
| NTSB Number | CHI01IA016 |
| Missing Aircraft Indicator | N |
| Federal Aviation Reg. Part | Part 91: General Aviation |
| Type of Flight Plan filed | IFR |
| Flight plan Was Activated? | Yes |
| Damage | Minor |
| Aircraft Fire | None |
| Aircraft Explosion | None |
| Aircraft Manufacturer's Full Name | Boeing |
| Aircraft Model | B-727-61 |
| Aircraft Series Identifier | B-727-61 |
| Aircraft Serial Number | 19176 |
| Certified Max Gross Weight | 160500 |
| Aircraft Category | Airplane |
| Aircraft Registration Class | Unknown |
| Aircraft is a homebuilt? | No |
| Flight Crew Seats | -- |
| Cabin Crew Seats | -- |
| Passenger Seats | -- |
| Total number of seats on the aircraft | 125 |
| Number of Engines | 3 |
| Fixed gear or retractable gear | Retractable |
| Aircraft, Type of Last Inspection | Continuous Airworthiness |
| Date of Last Inspection | Sep 23 2000 12:00AM |
| Airframe hours since last inspection | 65 |
| Airframe Hours | 35226 |
| ELT Installed | No |
| ELT Activated | No |
| ELT Aided Location of Event Site | No |
| ELT Type | -- |
| Aircraft Owner Name | U. S. DEPARTMENT OF JUSTICE |
| Aircraft Owner Street Address | 5900 AIR CARGO ROAD |
| Aircraft Owner City | OKLAHOMA CITY |
| Aircraft Owner State | OK |
| Aircraft Owner Country | -- |
| Aircraft Owner Zipcode | 73159 |
| Operator is an individual? | No |
| Operator Name | -- |
| Operator Same as Owner? | Yes |
| Operator Is Doing Business As | -- |
| Operator Address Same as Owner? | Yes |
| Operator Street Address | -- |
| Operator City | -- |
| Operator State | -- |
| Operator Country | -- |
| Operator Zip code | -- |
| Operator Code | -- |
| Owner has at least one certificate | None |
| Other Operator of large aircraft? | -- |
| Certified for Part 133 or 137 Operation | -- |
| Operator Certificate Number | -- |
| Indicates whether an air carrier operation was scheduled or not | -- |
| Indicates Domestic or International Flight | -- |
| Operator carrying Pax/Cargo/Mail | -- |
| Type of Flying (Per_Bus / Primary) | Public Use |
| Second Pilot on Board | Yes |
| Departure Point Same as Event | No |
| Departure Airport Code | DTW |
| Departure City | DETROIT |
| Departure State | MI |
| Departure Country | USA |
| Departure Time | 1145 |
| Departure Time Zone | CDT |
| Destination Same as Local Flt | -- |
| Destination Airport Code | ORD |
| Destination City | CHICAGO |
| Destination State | IL |
| Destination Country | USA |
| Specific Phase of Flight | Approach |
| Report sent to ICAO? | -- |
| Evacuation occurred | No |
| Date of most recent change to record | Aug 26 2002 4:06PM |
| User who most recently changed record | SULP |
| Since inspection or accident | Time of Accident |
| Event Location Runway Number and Location | 09R |
| Runway Length | 10141 |
| Runway Width | 150 |
| Sight Seeing flight | No |
| Air Medical Flight | No |
| Medical Flight | -- |