ASN Wikibase Occurrence # 352446
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| Date: | Thursday 14 October 1999 |
| Time: | 13:55 LT |
| Type: |  McDonnell Douglas DC-9-51 |
| Owner/operator: | Northwest Airlines |
| Registration: | N766NC |
| MSN: | 47739/852 |
| Year of manufacture: | 1977 |
| Total airframe hrs: | 56338 hours |
| Engine model: | P&W JT8D17H |
| Fatalities: | Fatalities: 0 / Occupants: 105 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Chicago-Midway Airport, IL (MDW/KMDW) -
 United States of America
|
| Phase: | Take off |
| Nature: | Passenger - Scheduled |
| Departure airport: | Chicago-Midway Airport, IL (MDW/KMDW) |
| Detroit-Metropolitan Wayne County Airport, MI (DTW/KDTW) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
A DC-9-51 sustained a left outboard main (#1 main) wheel and tire assembly separation on takeoff. That wheel impacted and dislodged the airport's perimeter wall and impacted a vehicle on a nearby road. The wall panels impacted another vehicle. No injuries were reported. The flight landed without incident at its intended destination. That tire assembly was found pressurized and its hubcap was found intact. Its axle nut was found intact under the hubcap. The interior portion of the #1 axle was examined and its internal threads were found intact. The anti-skid transducer adapter was found loosened inside the axle's threads and backed out 4 1/2 turns. A gap was designed to exist between the adapter and the nut. The axle nut was found to contact the adapter when the adapter was backed out to the position as found. The tire was changed on October 1, 1999. The mechanics installed the wheel in accordance with manual 32-40-1. That manual was reviewed and its steps did not caution mechanics to check for the proper depth of the adapter. DC-9-20 through 40 series airplane's anti-skid transducer assemblies were initially secured in position through safety wire. Service Bulletin (SB) 32-111 was issued to incorporate a set screw method in lieu of safety wiring the anti-skid transducer in place. This airplane's SB 32-111 modification was incorporated prior to its delivery to the airline. Subsequent to the incident, the manufacturer issued temporary service bulletins to the affected airplane's 32-40-01 maintenance manuals, cautioning mechanics to check the depth dimension of the transducer adapter with reference to the applicable technical data.
Probable Cause: The landing gear's wheel separation due to the improper installation of the wheel by company maintenance personnel using incomplete maintenance steps, and the maintenance steps not listed in the manufacturer's manual. Factors were the airport perimeter wall and the vehicles.
Accident investigation:
 |
|
Sources:
NTSB CHI00IA009
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 07-Mar-2024 14:31 | ASN Update Bot | Added |
| 07-Mar-2024 14:36 | ASN | Updated [Aircraft type, Cn, Operator, Location, Nature, Departure airport, Destination airport, Narrative] |
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