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NTSB Report
August 20, 1983 · Boeing 767 · N609UA
Denver, CO
Overview
Report Status
Preliminary report
Event Type
Incident
Date
August 20, 1983
Injury Outcomes
No injuries (205 uninjured)
Location
Denver, CO
Aircraft
Boeing 767
Tail Number
N609UA
Injuries
None
NTSB Number
DCA83IA035
THE ACFT WAS DESCENDING FROM FL 410 WITH THE THROTTLES AT IDLE. AS POWER WAS ADDED AT FL 295 THE LEFT ENG SURGED & EXCEEDED MAX EGT. 18 SECS LATER THE RIGHT ENG SURGED & EXCEEDED ITS MAX EGT. THE LEFT & RIGHT ENGS WERE SHUT DOWN AT FL 200 & 177 RESPECTIVELY. THE ENGS WERE SUCCESSFULLY RESTARTED ABOUT FL 150. THE INABILITY OF THE ENGS TO ACCELERATE AFTER THE MANUALLY INDUCED SURGE WAS DUE TO CONTAMINATED FUEL NOZZLES WHICH SIGNIFICANTLY REDUCED COMBUSTION CHAMBER EFFICIENCIES & WHICH RESULTED IN A SUBIDLE STALL.
Full Narrative
THE ACFT WAS DESCENDING FROM FL 410 WITH THE THROTTLES AT IDLE. AS POWER WAS ADDED AT FL 295 THE LEFT ENG SURGED & EXCEEDED MAX EGT. 18 SECS LATER THE RIGHT ENG SURGED & EXCEEDED ITS MAX EGT. THE LEFT & RIGHT ENGS WERE SHUT DOWN AT FL 200 & 177 RESPECTIVELY. THE ENGS WERE SUCCESSFULLY RESTARTED ABOUT FL 150. THE INABILITY OF THE ENGS TO ACCELERATE AFTER THE MANUALLY INDUCED SURGE WAS DUE TO CONTAMINATED FUEL NOZZLES WHICH SIGNIFICANTLY REDUCED COMBUSTION CHAMBER EFFICIENCIES & WHICH RESULTED IN A SUBIDLE STALL.
Flight
Event TypeIncident
Event Time18:20 MDT
Nearest Airport46nm WSW
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 767
Tail NumberN609UA
Aircraft CategoryAir
Operating RulePart 121
Engines2
Engine TypeTurbofan
Engine DetailsP&W · JT9D-7R4 · Turbofan · 24000
Seats197
People & Injuries
Injury SummaryNo injuries (205 uninjured)
Fatal0
Serious0
Minor0
Uninjured205
Total205
Crew 1Age 55 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind160° @ 9 kt
Visibility40 sm
CeilingBroken clouds 25000 ft
Temperature / Dew Point52
Altimeter30.00 inHg
Observation Time00:50
Weather SourceWFAC