ASN Wikibase Occurrence # 384286
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| Date: | Thursday 27 May 1982 |
| Time: | 15:45 LT |
| Type: |  Hughes 500D |
| Owner/operator: | Southwestern Public Service Co |
| Registration: | N277SP |
| MSN: | 0461 |
| Year of manufacture: | 1970 |
| Total airframe hrs: | 2393 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Amarillo, TX -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Amarillo, TX |
| Amarillo, TX | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE PILOT REPORTED THAT HE WAS PRACTICING AUTOROTATIONS. WHEN HE ADDED POWER TO RECOVER FROM HIS EIGHTH AUTOROTATION, HE EXPERIENCED COMPRESSOR STALLS IN THE ENGINE AND A COMPLETE LOSS OF POWER AT ABOUT 20 FT AGL. THE HELICOPTER SETTLED AND MADE A HARD TOUCHDOWN. DURING TOUCHDOWN, THE MAIN ROTOR BLADES FLEXED DOWNWARD AND CHOPPED OFF THE TAIL BOOM. THE ENGINE WAS TRANSPORTED TO A TEST CELL WHERE IT WAS RUN UP IN AN "AS IS" CONDITION. IT OPERATED NORMALLY WITH A POWER OUTPUT OF 4.29% ABOVE THE MINIMUM REQUIRED. NO DISCREPANCIES WERE FOUND EXCEPT THERE WAS A MODERATE AIR LEAK FROM THE ANTI-ICE VALVE. THE VALVE WAS REPLACED AND THE ENGINE THEN PRODUCED 5.95% ABOVE THE MINIMUM REQUIRED POWER. THE ENGINE WAS THEN COMPLETELY DISASSEMBLED AND INSPECTED AND ALL PARTS WERE FOUND TO BE IN SATISFACTORY CONDITION. THE DENSITY ALTITUDE AT THE TIME OF THE ACCIDENT WAS ABOUT 5100 FT.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB FTW82DA195
History of this aircraft
Other occurrences involving this aircraft
| 8 February 2017 | N6640Z | U.S. Department of Agriculture APHIS | 0 | Price, UT | |
sub |
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 03-Apr-2024 09:32 | ASN Update Bot | Added |
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