NTSB Identification: CHI86IA115.
The docket is stored on NTSB microfiche number 33317.
Scheduled 14 CFR operation of NORTHWEST AIRLINE
Incident occurred Thursday, April 03, 1986 in MINNEAPOLIS, MN
Aircraft: BOEING 757-251, registration: N508US
Injuries: 161 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

N508US WAS OPERATING AS NWA FLT 150. THE CAPTAIN STATED AFTER THE INCIDENT THAT THE FLT WAS UNEVENTFUL UNTIL LANDING. UPON LANDING AND SPOILER DEPLOYMENT, THE ACFT PITCHED UP ABRUPTLY, TO AN ATTITUDE OF 10 DEGREES. THE LANDING WAS COMPLETED WITHOUT INCIDENT. EXAMINATION OF THE ACFT REVEALED DAMAGE TO THE ACFT FUSELAGE BELLY. BOEING ISSUED A SERVICE BULLETIN STATING THAT SPOILER DEPLOYMENT ON TOUCHDOWN WOULD PRODUCE A NOSE UP AERODYNAMIC MOMENT. SOLUTIONS TO THIS OCCURRENCE IS A MODIFICATION TO THE SPOILER DEPLOYMENT AND USE OF AUTO BRAKING DURING LANDING.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

FLARE..EXCESSIVE..PILOT IN COMMAND

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

INFORMATION INSUFFICIENT..MANUFACTURER

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

ACFT/EQUIP,INADEQUATE HANDLING/PERF CAPABILITIES..MANUFACTURER

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

BRAKES(NORMAL)..NOT USED..PILOT IN COMMAND


Contributing Factors

INSUFFICIENT STANDARDS/REQUIREMENTS,MANUFACTURER..FAA(ORGANIZATION)


Contributing Factors

SPOILER EXTENSION..PERFORMED..PILOT IN COMMAND

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