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NTSB Report
November 10, 1990 · Saab-Scania Ab Saab 340A · N322PX
Memphis, TN
Overview
Report Status
Probable Cause
Event Type
Incident
Date
November 10, 1990
Injury Outcomes
No injuries (3 uninjured)
Location
Memphis, TN
Aircraft
Saab-Scania Ab Saab 340A
Tail Number
N322PX
Operator
Heleasco Twenty Four
Injuries
None
NTSB Number
ATL91IA016
NO PASSENGERS WERE ON THE AIRPLANE WHEN IT DEPARTED MEMPHIS. THE FLIGHT WAS UNEVENTFUL UNTIL THE CAPTAIN FELT A VIBRATION ON THE LEFT SIDE AND BELIEVED THAT THE PROPELLER WAS THE ORIGIN. HE ASKED THE FIRST OFFICER (FO) HAD HE EVER SEEN THE PROPELLER IN FEATHER; THE FO SAID NO. THE CAPTAIN INSTRUCTED THE FO TO GO INTO THE PASSENGER CABIN AND LOOK AT THE LEFT PROPELLER IN FEATHER. SECONDS LATER THE AIRPLANE STARTED A SERIES OF VIOLENT GYRATIONS, WHICH THREW HIM AND THE FLIGHT ATTENDANT AGAINST THE INTERIOR OF THE CABIN. AFTER LOSING SEVERAL THOUSAND FEET FROM 11,000 FEET, THE FLIGHT CREW MANAGED TO REGAIN CONTROL OF THE AIRPLANE AND LANDED WITHOUT FURTHER INCIDENT. A REVIEW OF THE EVENT AND THE REPORTED VIBRATION FELT ONLY BY THE CAPTAIN, FAILED TO REVEAL A MECHANICAL PROBLEM WHICH WOULD HAVE PRODUCED A VIBRATION. THE PROCEDURES EMPLOYED BY THE CAPTAIN WERE NOT IN ACCORDANCE WITH FAA OR COMPANY APPROVED DIRECTIVES.
NTSB Probable Cause
THE PILOT'S FAILURE TO FOLLOW APPROVED PROCEDURES FOR TROUBLESHOOTING INFLIGHT MAINTENANCE PROBLEMS AND IMPROPERLY USED THE FLIGHT AND ENGINE CONTROLS.
Full Narrative
NO PASSENGERS WERE ON THE AIRPLANE WHEN IT DEPARTED MEMPHIS. THE FLIGHT WAS UNEVENTFUL UNTIL THE CAPTAIN FELT A VIBRATION ON THE LEFT SIDE AND BELIEVED THAT THE PROPELLER WAS THE ORIGIN. HE ASKED THE FIRST OFFICER (FO) HAD HE EVER SEEN THE PROPELLER IN FEATHER; THE FO SAID NO. THE CAPTAIN INSTRUCTED THE FO TO GO INTO THE PASSENGER CABIN AND LOOK AT THE LEFT PROPELLER IN FEATHER. SECONDS LATER THE AIRPLANE STARTED A SERIES OF VIOLENT GYRATIONS, WHICH THREW HIM AND THE FLIGHT ATTENDANT AGAINST THE INTERIOR OF THE CABIN. AFTER LOSING SEVERAL THOUSAND FEET FROM 11,000 FEET, THE FLIGHT CREW MANAGED TO REGAIN CONTROL OF THE AIRPLANE AND LANDED WITHOUT FURTHER INCIDENT. A REVIEW OF THE EVENT AND THE REPORTED VIBRATION FELT ONLY BY THE CAPTAIN, FAILED TO REVEAL A MECHANICAL PROBLEM WHICH WOULD HAVE PRODUCED A VIBRATION. THE PROCEDURES EMPLOYED BY THE CAPTAIN WERE NOT IN ACCORDANCE WITH FAA OR COMPANY APPROVED DIRECTIVES.
Flight
Event TypeIncident
Event Time10:22 CST
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftSaab-Scania Ab Saab 340A
Tail NumberN322PX
Aircraft CategoryAir
OperatorHeleasco Twenty Four
Operating RulePart 121
Engines2
Engine TypeTurboprop
Engine DetailsGe · CT7-5A2 · Turboprop · 1735
Seats37
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 32 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind320° @ 8 kt
Visibility8 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Observation Time15:51
Weather SourceWFAC