ASN Wikibase Occurrence # 374574
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| Date: | Monday 21 July 1986 |
| Time: | 13:33 LT |
| Type: |  Bell 222UT |
| Owner/operator: | Pumpkin Air, Inc. |
| Registration: | N222DU |
| MSN: | 47530 |
| Total airframe hrs: | 1882 hours |
| Engine model: | LYCOMING LTS101-750C-1 |
| Fatalities: | Fatalities: 0 / Occupants: 5 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Chapel Hill, NC -
 United States of America
|
| Phase: | En route |
| Nature: | Unknown |
| Departure airport: | Lumberton, NC |
| Durham, NC | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
DRG AN EMERG MED SVC (EMS)/MED EVAC FLT, AN UNCONTAINED PWR TURBINE BURST OF THE #1 ENG OCCURRED. DEBRIS FM THE #1 ENG DISABLED THE #2 ENG & SEVERED THE TAIL ROTOR DRIVE SHAFT. THE #2 ENG FIRE LGT ILLUMINATED & THE PLT DISCHARGED THE #2 ENG FIRE EXTINGUISHER. DRG AN AUTOROTATIVE LNDG, THE PLT INCREASED COLLECTIVE TO CLR TREES, AND THE HELICOPTER ROLLED ON ITS SIDE AT TOUCHDOWN. THE PLT, 1 NURSE & THE PATIENT WERE UNHARMED, BUT 2 NURSES RCVD MINOR INJURIES. AN EXAM SHOWEDTHE #2 & #3 BRGS IN THE #1 ENG HAD OVERHEATED & FAILED DUE TO LACK OF LUBRICATION. OIL PASSAGES & JETS TO THE BRGS WERE FND CLOGGED WITH HVY CARBON DEPOSITS. THE ENG COMBUSTOR HOUSING WAS CHNGD APRX 13 FLT HRS BFR THE ACDNT DUE TO A CLOGGEDVENT STRUT; AFTER DRAINING OIL, THE OIL SYS WASN'T FLUSHED, BUT FLUSHING WASN'T REQD. EVIDENCE SHOWED LYC LTS 101-750C-1ENGS WERE SUSCEPTIBLE TO CARBON CLOGGING; THAT THE #2 SEALS TENDED TO ERODE & ALLOW EXCESSIVE HOT GASES INTO THE #2 & #3BRGS. AFTER THE ACDNT, THE FAA ISSUED AD 86-22-05, REQUIRING INCREASED INSPN & MAINT PROCEDURES TO PREVENT RECURRENCE.
Probable Cause:
Accident investigation:
 |
|
Sources:
NTSB ATL86FA203
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Mar-2024 10:47 | ASN Update Bot | Added |
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