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NTSB Report
October 29, 1995 · Boeing B-737-500 · N904UA
San Francisco, CA
Overview
Report Status
Final with probable cause
Event Type
Incident
Date
October 29, 1995
Injury Outcomes
No injuries (3 uninjured)
Location
San Francisco, CA
Aircraft
Boeing B-737-500
Tail Number
N904UA
Operator
United Airlines
Injuries
None
NTSB Number
DCA96IA005
On October 29, 1995, at 1239 PST, a United Airlines Boeing 737-500, N904UA, experienced an upset during a maintenence test flight while on an ILS approach to San Francisco International Airport (SFO). The upset occurred when the flight crew was given a go-around by approach control and the captain selected the takeoff and go-around switch. The airplane pitched up to about 45 degrees nose up and the stick shaker activated. The pilots stated that they pushed the control column forward and both attempted to retrim the nose down but were not able to overcome the increase in pitch. The airplane stalled, rolled slightly, and the nose dropped. After the flightcrew recovered from the upset, the airplane made a normal landing at SFO.
NTSB Probable Cause
The inadvertant stall for undertermined reasons.
Full Narrative
On October 29, 1995, at 1239 PST, a United Airlines Boeing 737-500, N904UA, experienced an upset during a maintenence test flight while on an ILS approach to San Francisco International Airport (SFO). The upset occurred when the flight crew was given a go-around by approach control and the captain selected the takeoff and go-around switch. The airplane pitched up to about 45 degrees nose up and the stick shaker activated. The pilots stated that they pushed the control column forward and both attempted to retrim the nose down but were not able to overcome the increase in pitch. The airplane stalled, rolled slightly, and the nose dropped. After the flightcrew recovered from the upset, the airplane made a normal landing at SFO.
Flight
Event TypeIncident
Event Time12:49 PST
Nearest Airport0nm
Runway0
Flight Plan FiledVfif
Aircraft FireUnknown
Aircraft ExplosionUnknown
Aircraft
AircraftBoeing B-737-500
Tail NumberN904UA
Aircraft CategoryAir
OperatorUnited Airlines
Operating RulePart 91
Engine TypeUnknown
Engine DetailsUnknown
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Unknown
Conditions
ConditionsIMC
LightNr
WindCalm
Visibility3 sm
CeilingOvercast 800 ft
Temperature / Dew Point57 / 54
Altimeter29.00 inHg
Weather SourcePILO