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December 3, 2012 · Cessna 208B · N169LJ

Mekoryuk, AK

Overview

Report Status
Final with probable cause
Event Type
Accident
Date
December 3, 2012
Injury Outcomes
1 injury (1 minor injury), 8 uninjured
Location
Mekoryuk, AK
Aircraft
Cessna 208B
Tail Number
N169LJ
Operator
Hageland Aviation Services
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
ANC13LA012

Shortly after the scheduled commuter flight departed with the second-in-command (SIC) at the controls, the engine "coughed," started vibrating, and lost power. The SIC attempted to restart the engine, but was unsuccessful. Subsequently, the pilot-in-command assumed control of the airplane and landed on a frozen bay, which resulted in substantial damage to the airplane's right wing and fuselage. A postaccident examination of the airplane's engine revealed that one of the first-stage compressor blades had fractured due to fatigue cracking. The source of the fatigue crack could not be determined due to secondary damage sustained to the fracture surface.

NTSB Probable Cause

The total loss of engine power as a result of a fractured first-stage compressor blade due to fatigue cracking. The source of the fatigue crack could not be determined due to secondary damage sustained to the fracture surface.

Full Narrative

On December 3, 2012, about 1050 Alaska standard time, a Cessna 208B airplane, N169LJ, sustained substantial damage during a forced landing shortly after takeoff from the Mekoryuk Airport, Mekoryuk, Alaska. Of the nine people aboard, the two pilots and six passengers were not injured, and one passenger sustained minor injuries. The airplane was being operated as Flight 140, by Hageland Aviation Services, Inc., dba ERA Alaska, Anchorage, Alaska, as a visual flight rules (VFR) scheduled commuter flight under the provisions of 14 Code of Federal Regulations (CFR) Part 135. Visual meteorological conditions prevailed, and company flight following procedures were in effect. The flight originated at the Mekoryuk Airport about 1045, and was destined for Bethel, Alaska.In a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), the pilot-in-command (PIC) stated that the second-in-command (SIC) was the flying pilot for the flight to Bethel. He said that the takeoff and initial climb were normal, but shortly after passing 1,000 feet, the engine "coughed," started vibrating, and lost power. An attempt to restart the engine was not successful. The PIC assumed control of the airplane, and landed on a frozen bay approximately 5 miles northeast of the Mekoryuk Airport. Witnesses at the airport observed the airplane descending, and responded with snow machines, and all-terrain vehicles to transport the airplane's occupants back to Mekoryuk. During the forced landing the airplane sustained substantial damage to the fuselage and right wing. The airplane was equipped with a Pratt & Whitney PT6A-114A turbine engine. A postaccident engine examination, performed at the facilities of Pratt & Whitney Canada, St. Hubert, Quebec, Canada, and under the direction of a senior NTSB powerplants investigator, revealed that a blade on the first stage compressor rotor failed as a result of a fatigue fracture. The fatigue crack initiated from the leading edge area and then propagated towards the trailing edge, and at mid-chord, the blade released by tensile overload. The initiation of the fracture could not be determined because of secondary damage to the fracture surface. A copy of the Safety Board powerplants investigator's report is included in the public docket for this incident. During the last engine overhaul, 5 first stage compressor blades were replaced with new blades. The blade that failed during the accident flight was one of the five replaced blades based on the batch numbers recorded on the blades.

Flight

Event TypeAccident
Event Time05:50 AKST
Nearest AirportMEKORYUK (2nm)
Flight Plan FiledCvfr
Flight Plan ActivatedYes
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftCessna 208B
Tail NumberN169LJ
Aircraft CategoryAir
DamageSubstantial
OperatorHageland Aviation Services
Operating RulePart 135
Engines1
Engine TypeTurboprop
Engine DetailsP&W · PT6A SER · Turboprop · 750
Seats12

People & Injuries

Injury Summary1 injury (1 minor injury), 8 uninjured
Fatal0
Serious0
Minor1
Uninjured8
Total9
Crew 1Age 31 · Second Class · None
Crew 2Age 26 · Second Class · None

Conditions

ConditionsVMC
LightDaylight
Wind40° @ 7 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point9 C / 1 C
Altimeter30.25 inHg
Observation Time14:56
Weather SourceWFAC

Appendix: Source Data