- Date
- November 10, 1991, 08:50 local (18:50 UTC)
- Place
- Hilo, HI
- Injuries
- 11 uninjured
- Damage
- Substantial damage
- Phase of flight
- Enroute
- Aircraft
- N4193Beech D18S
- Weather
- Visual (VMC) · Day
- Status
- Completed · report March 2, 1993
- Report
- Approved by Office Director
- FAA report
- 19911110050039A
- Case key
- 27501
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
The aircraft's lack of single engine performance to maintain altitude after the engine lost power. Factors related to the accident were: displacement/mechanical interference within the accessory drive gear system of the left engine, failure of the left engine accessory drive gear shaft, and the faa's inadequate certification/approval of the operator, in order to assure compliance with 14 CFR 135 concerning the engine-out capability.
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
Abt 45 mi fm lndg, the l eng RPM bgn to fluctuate, then at abt 15 mi fm lndo, it lost power altogether. The plt said the acft would not maint altitude. Unable to rch the rwy, he ditched the acft in Hilo bay abt 1/4 mi fm shore & 1.5 mi fm the arpt. After retrieval, the acft & l eng were examined. The accessory gear drive shaft was fnd to have failed in torsional overload. On the inside of the case, an area of gouging & abrasion was fnd drctly in fnt of the starter gear. (The left mag, fuel pump & prop governor were driven by the accessory drive gear.) Deep impressions were noted on abt 70% of the gear teeth, with mtrl displacement & gouging evident. There was evidence that the collector drive floating gear may have moved forward & had contacted the eng case. Also, there was evidence of mechanical interference within the accessory drive gear sys. The acft gross wt at the time of the acdnt was about 9108 lbs.
Aircraft
- Registration
- N4193
- Reported as
- Beech D18S
- Category
- Airplane
- Serial number
- A980
- Airframe hours
- 19,936
- Engine
- P&W R-985-AN14B, 450 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Part 135
- Operator
- Tomy International, doing business as Scenic Air Tours
- Registered owner
- Tomy International
- Airworthiness certificate
- Standard, Normal
- Last inspection
- 100 hour · October 28, 1991 · 35 hours before
- Departed
- HNL · Honolulu, HI
- Destination
- ITO · Hilo, HI
- Flight plan
- VFR
- Airport
- ITO · Hilo International, runway 8, 9,800 × 150 ft, macadam
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 56
- Certificate
- Airline transport
- Airplane ratings
- Multi-engine land
- Instrument ratings
- Airplane
- Medical
- Class 2, Valid Medical--w/ waivers/lim
- Seat
- Left
- Flight hours
- 18,579 total · 323 in this make and model · 10,712 as pilot in command · 180 in the last 90 days · 59 in the last 30 days · 2 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 260° at 10 knots
- Visibility
- 15 statute miles
- Lowest ceiling
- 28,000 ft broken
- Temperature
- 79 °F, dew point 70 °F
- Altimeter
- 30.00 inHg
- Observed at
- ITO, 1 nm away
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.
Other investigations on N4193 · 1
Matched to the same aircraft by N-number and date.