MKC89IA048

NTSB incident investigation · Gulfstream Commander 690A · St. Paul, MN · December 29, 1988

Incident · No injuriesIncident investigationFinal report
Date
December 29, 1988, 07:00 local (13:00 UTC)
Place
St. Paul, MN
Injuries
1 uninjured
Damage
No damage
Phase of flight
Takeoff
Aircraft
N690MFGulfstream Commander 690A
Weather
Visual (VMC) · Dawn
Status
Completed · report January 24, 1990
Report
Approved by Office Director
FAA report
19881229058199I
Case key
34703

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the incident.

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Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Loss of engine power(partial) - mech failure/malfTakeoff - roll/run
Combustion assembly - rupturedCause
Combustion assembly - fatigueCause

Analysis

The PIC had prefltd his commander turboprop and prepared for takeoff fm the St. Paul arpt. During the takeoff roll just as the acft was rotated to takeoff attitude, the rt eng failed. The PIC eased the acft back to the rwy, reduced pwr and came to a stop on the remaining rwy. With the remaining eng the PIC taxied back to the ramp area. Insp of the eng revealed a failed plenum chamber, with a large tear in the inconel 718 sheet metal. Metallurgical exam of the plenum revealed multiple fatigue fracture areas in the welded seams. The eng was subsequently inspctd, a serviceable plenum was used as a replacement and the engine was returned to service.

Aircraft

Registration
N690MF
Reported as
Gulfstream Commander 690A (COMMANDER)
Category
Airplane
Serial number
11103
Airframe hours
6,331
Engine
Garrett TPE-331-5251K, 717 horsepower, turbo prop
Damage
No damage
Fire
In-Flight
Flight
Part 135
Operator
Great Western Aviation
Registered owner
Great Wester Aviation Company
Airworthiness certificate
Standard, Normal
Last inspection
AAIP · December 13, 1988 · 31 hours before
Destination
FSD · Sioux Falls, SD
Flight plan
IFR

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
35
Certificates
Flight instructor, Airline transport
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
4,014 total · 486 in this make and model · 3,956 as pilot in command · 251 in the last 90 days · 79 in the last 30 days · 4 in the last 24 hours

Weather

Conditions
Visual (VMC) · Dawn
Wind
120° at 7 knots
Visibility
15 statute miles
Lowest ceiling
None
Temperature
5 °F, dew point 10 °F
Altimeter
30.00 inHg
Observed at
STP

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.