ASN Wikibase Occurrence # 70677
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| Date: | Thursday 27 June 1991 |
| Time: | 14:05 LT |
| Type: |  Sikorsky S-64E (WFS-64A) |
| Owner/operator: | Erickson Air Crane Co. |
| Registration: | N6959R |
| MSN: | 64002 |
| Year of manufacture: | 1962 |
| Engine model: | P&W JFTD12A4A |
| Fatalities: | Fatalities: 0 / Occupants: 5 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | Index, WA -
 United States of America
|
| Phase: | Standing |
| Nature: | Unknown |
| Departure airport: | Index, WA (NONE) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE ACFT WAS ON AN EXTERNAL LOAD LOGGING OPN AND THE PIC HAD LANDED AT A FIELD SITE TO REFUEL. THE PIC EXITED, WITH THE ACFT RUNNING AT FULL RPM WHILE IT WAS BEING REFUELED, AND THE COPILOT REMAINED IN THE RIGHT SEAT COMPLETING LOAD REPORTS. THE ACFT CONTROLS WERE UNATTENDED. THE CREW CHIEF WAS SEATED IN THE AFT FACING HOIST OPR STATION, WHICH HAD THE COLLECTIVE PITCH STICK INSTALLED BESIDE THE SEAT. HE HAD BECOME AIR SICK DURING THE FLT, AND REMAINED SEATED AFTER THE PIC EXITED. WHEN HE ATTEMPTED TO EXIT, WHICH REQUIRED THAT HE STAND, TURN AROUND AND STEP UP OUT OF THE SEAT WELL, THE ACFT TOOK OFF TO A HOVER AND ROTATED TO THE LEFT. THE TAIL ROTOR STRUCK A ROTOR BLADE BOX ON TOP OF A SUPPORT TRAILER PARKED BY THE REFUELING SITE, FRACTURING THE AFT TAIL BOOM, PYLON AND TAIL ROTOR FROM THE ACFT. THE ACFT PITCHED NOSE DOWN, ROLLED OVER AND IMPACTED THE GROUND.
Probable Cause: THE CONTROL INTERFERENCE BY THE MECHANIC WHEN HE INADVERTENTLY RAISED THE COLLECTIVE PITCH AND THE COPILOT'S FAILURE TO ATTEND THE FLIGHT CONTROLS. FACTORS RELATING TO THE ACCIDENT WERE THE MOTION SICKNESS OF THE MECHANIC, INADEQUATE COLLECTIVE PITCH CONTROL LOCKING MECHANISM UTILIZED BY THE COMPANY, AND ADMINISTRATIVE TASKS THAT DIVERTED THE CO-PILOT'S ATTENTION FROM ATTENDING THE FLIGHT CONTROLS.
Accident investigation:
 |
|
Sources:
NTSB SEA91FA143
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Dec-2009 10:48 | TB | Updated [Aircraft type, Cn, Narrative] |
| 19-Mar-2011 13:38 | TB | Updated [Time, Registration, Phase, Source, Narrative] |
| 19-Mar-2011 13:45 | TB | Updated [Narrative] |
| 10-Mar-2012 12:30 | TB | Updated [Total occupants, Nature, Source, Narrative] |
| 10-Mar-2012 12:32 | TB | Updated [Time] |
| 11-Mar-2012 11:13 | TB | Updated [Registration, Total occupants, Source, Narrative] |
| 21-Dec-2016 19:25 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 11-Apr-2024 14:31 | ASN Update Bot | Updated [Time, Cn, Operator, Total occupants, Other fatalities, Nature, Departure airport, Source, Narrative, Category, Accident report] |
Corrections or additions? ... Edit this accident description
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