Gates Lear Jet 35A N1500E

Summary

On 10 December 1982 at about 16:30 local time, a Gates Lear Jet 35A registered N1500E, operated by Bucyrus Erie Company, was involved in an incident near Over Fargo, North Dakota, United States. 3 people were on board and nobody was injured. The aircraft was slightly damaged. No probable cause statement is available for this record.

Date

10 December 1982 at 16:30

Classification

Incident

Location

Over Fargo, North Dakota, United States

Coordinates

Not recorded

Aircraft

Gates Lear Jet 35A

Registration

N1500E

Category

Airplane

Engines

2

Operator

Bucyrus Erie Company

Operating rule

Part 91: General Aviation

Purpose of flight

Executive/Corporate

Phase of flight

Not recorded

Route

Jamestown → Milwaukee

Aircraft damage

Minor

Weather

VMC

Light

Day

NTSB number

CHI83IA054

Nobody was injured.

The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.

Nothing about the cause is stated here that is not in the source record.

Read the full NTSB 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.

Quoted verbatim from the NTSB record.