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NTSB Report
April 3, 1986 · Boeing 757-251 · N508US
Minneapolis, MN
Overview
Report Status
Preliminary report
Event Type
Incident
Date
April 3, 1986
Injury Outcomes
No injuries (161 uninjured)
Location
Minneapolis, MN
Aircraft
Boeing 757-251
Tail Number
N508US
Operator
Northwest Airline
Injuries
None
Aircraft Damage
Minor
NTSB Number
CHI86IA115
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.
Full Narrative
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.
Flight
Event TypeIncident
Event Time13:32 CST
Nearest AirportMinneapolis/St. Paul (0nm N)
Runway11R
Runway Length1000 ft
Runway Width200 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 757-251
Tail NumberN508US
Aircraft CategoryAir
DamageMinor
OperatorNorthwest Airline
Operating RulePart 121
Engines2
Engine TypeTurbofan
Engine DetailsP&W · 2037 · Turbofan · 37600
Seats178
People & Injuries
Injury SummaryNo injuries (161 uninjured)
Fatal0
Serious0
Minor0
Uninjured161
Total161
Crew 1Age 48 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind70° @ 16 kt
Visibility7 sm
CeilingOvercast 1000 ft
Temperature / Dew Point43 C / 39 C
Altimeter30.00 inHg
Observation Time18:53
Weather SourceWFAC