Aerospatiale SA-315B N58000

Summary

On 7 August 1990 at about 20:30 local time, a Aerospatiale SA-315B registered N58000 was involved in an accident near Tok, Alaska, United States. One person was on board and one was seriously injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

7 August 1990 at 20:30

Classification

Accident

Location

Tok, Alaska, United States

Coordinates

63.1809, -143.1000

Aircraft

Aerospatiale SA-315B

Registration

N58000

Category

Helicopter

Engines

1

Operator

Not recorded

Operating rule

Part 133: Rotorcraft Ext. Load

Purpose of flight

Other Work Use

Phase of flight

Not recorded

Route

Tok → Unknown

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

ANC90LA135

1 person was seriously injured.

IMPROPER INSTALLATION OF THE FUEL FILTER ELEMENT IN THE AIRCRAFT BY COMPANY/MAINTENANCE PERSONNEL, AND SUBSEQUENT CONTAMINATION OF THE FUEL SYSTEM BY UNFILTERED FUEL. FACTORS RELATED TO THE ACCIDENT WERE: INADEQUATE DESIGN OF THE FUEL FILTER ASSEMBLY, WHICH ALLOWED THE IMPROPER INSTALLATION OF THE FILTER ELEMENT, THE MECHANICS LACK OF FAMILIARITY WITH THE AIRCRAFT, AND FAILURE OF GROUND PERSONNEL TO INSURE THAT FUEL FROM THE FUEL TANKER WAS FREE OF CONTAMINATION.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

THE HELICOPTER WAS BEING USED IN AN EXTERNAL LOAD OPN TO CARRY CARGO WITH A 100 FT CABLE. WHILE HOVERING OUT OF GROUND EFFECT, THE ENG LOST PWR. A SUBSEQUENT HOVERING AUTOROTATION RESULTED IN A HARD LANDING. AN EXAM REVEALED THE LOSS OF POWER WAS DUE TO FUEL CONTAMINATION ALTHOUGH AN AIRFRAME FUEL FILTER WAS INSTALLED IN THE MAIN FUEL SUPPLY LINE. AN EXAM REVEALED THE FILTER ELEMENT HAD BEEN INSTALLED BACKWARD IN THE FILTER CANISTER. THIS ALLOWED CONTAMINATED FUEL TO BYPASS THE FILTER ELEMENT & ENTER THE ENG FUEL CTL UNIT. THE REVERSE INSTLN ALSO RESULTED IN AN INOP 'FUEL FILTER CLOGGED' WARNING LGT & PREVENTED THE PRESSURE DIFFERENTIAL BUTTON ON THE FILTER HOUSING FM EXTDG. THE FILTER HAD BEEN INSPECTED & REINSTLD DRG A 100 HR INSPN, 17 FLT HRS BFR THE ACDNT. THIS WORK WAS DONE BY A PLT UNDER SUPERVISION OF A MECHANIC. THE MECHANIC HAD NO PREV EXPERIENCE WITH THIS MAKE & MODEL OF HELICOPTER. 'TOP' & 'BOTTOM' WERE STENCILED ON THE FILTER ELEMENT IN FRENCH. CONTAMINATED FUEL WAS ALSO FND IN THE FUEL TRUCK.

Quoted verbatim from the NTSB record.