ASN Wikibase Occurrence # 380756
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| Date: | Friday 30 September 1983 |
| Time: | 10:00 LT |
| Type: |  Hughes 369D (500) |
| Owner/operator: | Rocky Mountain Helicopter, Inc |
| Registration: | N8693F |
| MSN: | 180252D |
| Year of manufacture: | 1978 |
| Total airframe hrs: | 3183 hours |
| Engine model: | Allison 250-C20B |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Provo, UT -
 United States of America
|
| Phase: | Manoeuvring (airshow, firefighting, ag.ops.) |
| Nature: | Unknown |
| Departure airport: | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE HELICOPTER WAS ON A TEST FLT TO TRACK & BALANCE THE MAIN ROTOR SYSTEM & TO COMPLETE A 100 HR INSPECTION. PRIOR TO THE FLT, AN OCCASIONAL FLICKER OF THE FUEL FILTER LIGHT WAS NOTED, BUT IT WAS THOUGHT TO BE A WIRING PROBLEM. AFTER TAKING OFF, THE FUEL FILTER LIGHT FLICKERED ON A FEW MORE TIMES, BUT NEVER ILLUMINATED STEADILY. AFTER LESS THAN A MINUTE OF FLYING TIME, THE PLT FELT 2 QUICK 'JERKS' (YAWS). HE START A 180 DEG TURN TO LAND. AFTER 90 DEG OF TURN, THE N2 DECREASED TO 95%, THEN SURGED TO 105%, THEN THE ENG QUIT RUNNING. THE PLT INITIATED AN AUTOROTATION, BUT DURING LANDING ON SOFT, WET TERRAIN, THE HELICOPTER ROCKED FORWARD & THE MAIN ROTOR STRUCK THE TAIL BOOM. AN EXAM OF THE HELICOPTER REVEALED A 'B' NUT ON 1 OF 2 DIFFERENTIAL PRESSURE LINES (CONNECTED TO THE FUEL FILTER DIFFERENTIAL PRESSURE SWITCH) WAS LOOSE. DURING THE EXAM, THE 'B' NUT SEPARATED FROM ITS ATTACH POINT BY A 1/2 TURN USING FINGER PRESSURE.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB DEN83FA224
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 01-Apr-2024 20:08 | ASN Update Bot | Added |
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