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NTSB Report
December 10, 1982 · Gates Lear Jet 35A · N1500E
Over Fargo, ND
Overview
Report Status
Preliminary report
Event Type
Incident
Date
December 10, 1982
Injury Outcomes
No injuries (3 uninjured)
Location
Over Fargo, ND
Aircraft
Gates Lear Jet 35A
Tail Number
N1500E
Operator
Bucyrus Erie
Injuries
None
Aircraft Damage
Minor
NTSB Number
CHI83IA054
WHILE LEVEL AT FL370 OVER FARGO, ND, THE CREW HEARD A LOUD BANG IN THE ENGINE AREA AND THE AIRCRAFT EXPERIENCED A SUDDEN LOSS OF CABIN PRESSURE. AT THE SAME TIME, THE CREW NOTICED THAT THEY HAD LOST POWER ON THE #2 ENGINE. AFTER SECURING THE ENGINE AND REGAINING CONTROL OF THE CABIN PRESSURIZATION, THE FLIGHT WAS CONTINUED TO MILWAUKEE, WI, WITHOUT FURTHER INCIDENT. EXAMINATION REVEALED TWO JAGGED HOLES IN THE ENGINE COWL AND ONE THROUGH THE AFT FUSELAGE. DETAILED EXAMINATION OF THE ENGINE REVEALED THAT IT HAD EXPERIENCED A SEGMENT SEPARATION OF THE 2ND STAGE LOW PRESSURE TURBINE DISC. THE CHUNK FAILURE WAS A RESULT OF IMPROPER MACHINING OF THE FORWARD SIDE WEB AREA OF THE DISC. THE PRESSURIZATION DROP OCCURRED WHEN SEPARATION DISC FRAGMENTS STRUCK AND DISABLED THE 3 WAY BLEED VALVE.
Full Narrative
WHILE LEVEL AT FL370 OVER FARGO, ND, THE CREW HEARD A LOUD BANG IN THE ENGINE AREA AND THE AIRCRAFT EXPERIENCED A SUDDEN LOSS OF CABIN PRESSURE. AT THE SAME TIME, THE CREW NOTICED THAT THEY HAD LOST POWER ON THE #2 ENGINE. AFTER SECURING THE ENGINE AND REGAINING CONTROL OF THE CABIN PRESSURIZATION, THE FLIGHT WAS CONTINUED TO MILWAUKEE, WI, WITHOUT FURTHER INCIDENT. EXAMINATION REVEALED TWO JAGGED HOLES IN THE ENGINE COWL AND ONE THROUGH THE AFT FUSELAGE. DETAILED EXAMINATION OF THE ENGINE REVEALED THAT IT HAD EXPERIENCED A SEGMENT SEPARATION OF THE 2ND STAGE LOW PRESSURE TURBINE DISC. THE CHUNK FAILURE WAS A RESULT OF IMPROPER MACHINING OF THE FORWARD SIDE WEB AREA OF THE DISC. THE PRESSURIZATION DROP OCCURRED WHEN SEPARATION DISC FRAGMENTS STRUCK AND DISABLED THE 3 WAY BLEED VALVE.
Flight
Event TypeIncident
Event Time10:30 CST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftGates Lear Jet 35A
Tail NumberN1500E
Aircraft CategoryAir
DamageMinor
OperatorBucyrus Erie
Operating RulePart 91
Engines2
Engine TypeTurbofan
Engine DetailsAirresearch · TFE-731-2-2B · Turbofan · 3500
Seats8
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 56 · First Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0