ASN Wikibase Occurrence # 381225
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| Date: | Friday 5 August 1983 |
| Time: | 12:45 LT |
| Type: |  Hughes 369D |
| Owner/operator: | Temsco Helicopters |
| Registration: | N1106Z |
| MSN: | 210900D |
| Year of manufacture: | 1981 |
| Total airframe hrs: | 1617 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Mcgrath, AK -
 United States of America
|
| Phase: | En route |
| Nature: | Executive |
| Departure airport: | Mcgrath, AK (MCG) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PLT STATED THAT HE WAS FLYING STRAIGHT & LEVEL AT APRX 700 FT AGL, WHEN THE ENG-OUT LIGHT ILLUMINATED. HE BEGAN AN AUTOROTATION TO A RIDGELINE. DURING THE LANDING, THE MAIN ROTOR BLADES CONTACTED THE TAIL BOOM & SEVERED IT FROM THE MAIN FUSELAGE. AN INVESTIGATION REVEALED THAT THE ENG BURNER DRAIN VALVE HAD AN AIR LEAKAGE OF 3000 CC/MIN. THE MAX ALLOWABLE OHM LIMIT WAS 800 CC/MIN (AT 20 PSI). THE COMBUSTION LINER HAD EXCESSIVE HEAT DISTORTION ADJACENT TO THE LARGE DIAMETER HOLE ON THE RIGHT SIDE OF THE SKIRT. THE 1ST STAGE TURBINE NOZZLE HAD SEVERE HEAT DISTRESS ON 14 TRAILING EDGE VANES & 11 LEADING EDGE VANES. THE FUEL NOZZLE HAD HEAVY CARBON DEPOSITS ON THE SPRAY TIP & AIR SHROUD. ALSO, A WHITE RESIDUE WAS FOUND IN THE ENG & A FUEL SAMPLE REVERSED 425 PARTS PER MILLION OF PHOSPHORUS.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB ANC83LA138
History of this aircraft
Other occurrences involving this aircraft
| 26 November 1990 | N1106Z | Temesco Helicopters Inc | 0 | Mulina, OR | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 02-Apr-2024 01:11 | ASN Update Bot | Added |
Corrections or additions? ... Edit this accident description
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