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| Date: | Friday 4 August 1995 |
| Time: | 22:48 LT |
| Type: |  Boeing 757-251 |
| Owner/operator: | Northwest Airlines |
| Registration: | N509US |
| MSN: | 23198/70 |
| Engine model: | P&W PW2037 |
| Fatalities: | Fatalities: 0 / Occupants: 127 |
| Aircraft damage: | None |
| Category: | Accident |
| Location: | Detroit, MI -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | San Francisco, CA (SFO |
| (KDTW) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE AIRPLANE HAD BEEN CLEARED TO DESCEND FROM FL410 TO FL230. THE ATC CONTROLLER AMENDED THE CLEARANCE TO FL270 SO THE FLIGHT WOULD HAVE A BETTER 'RIDE.' SHORTLY AFTER LEVELING OFF AT FL270, 25 NM EAST OF GRAND RAPIDS, MICHIGAN, SUDDEN, MODERATE TURBULENCE WAS ENCOUNTERED. A PASSENGER WHO WAS EXITING THE LAVATORY AT THE TIME FELL AND WAS SERIOUSLY INJURED. THE FLIGHT CREW STATED THE WEATHER RADAR DID NOT SHOW ANY WEATHER ON THE 80 MILE SCAN. THE SEAT BELT SIGN HAD BEEN ILLUMINATED ABOUT 5 MINUTES BEFORE THE TURBULENCE ENCOUNTER AND THE CAPTAIN MADE AN ANNOUNCEMENT FOR THE PASSENGERS TO EXPECT 'BUMPS' ON THE APPROACH. THE AIRPLANE'S LAVATORIES ARE EQUIPPED WITH A PUBLIC ADDRESS SPEAKER, A FLIGHT ATTENDANT CALL BUTTON, AND A 'RETURN TO SEAT' SIGN THAT IS ILLUMINATED WHEN THE CABIN SEAT BELT SIGN IS ACTIVATED. THE COMPANY'S DISPATCH/WEATHER DEPARTMENT'S WEATHER DATA SHOWED THE AIRPLANE HAD BEEN FLYING IN AN AREA OF 3/10'S COVERAGE OF LEVEL THREE AND FOUR THUNDERSTORMS.
Probable Cause: the flight's encounter with turbulence.
Accident investigation:
 |
|
Sources:
NTSB CHI95LA271
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 14-Mar-2024 15:21 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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