# Accident 19980619019709A: Cessna 207, Holy Cross, AK, June 19, 1998

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: June 19, 1998, 19:25 local time
- Place: Holy Cross, AK
- Damage: Substantial damage
- Phase of flight: Fcd/Prec Ldg From Cruise
- Operating rules: Air taxi and commuter (Part 135)
- Operator: B7TC
- Location: 62.1810° N, 159.8398° W: From the FAA, an estimate near the named town, within about 3 miles
- Nearby events: https://openairdocs.org/map.md?lat=62.1810&lon=-159.8398&mi=10
- Aircraft: N1673U, a cancelled registration (https://openairdocs.org/deregistered/N1673U-2017-09-18) (OpenAirDocs)
- Registry model: Cessna 207 (registry code 2073602, https://openairdocs.org/model/cessna-207) (OpenAirDocs)
- Registry engine: Continental IO-520 series (registry code 17032, https://openairdocs.org/engine/continental-io-520-series) (OpenAirDocs)
- Reported make and model: CESSNA 207
- Reported engine: CONT IO520F
- People aboard: 4
- Fatal injuries: 0
- Pilot flight hours: 12,000 total, 4,000 in this make and model, 110 in the last 90 days
- NTSB investigation: [NTSB ANC98LA078](https://openairdocs.org/ntsb/ANC98LA078) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/19980619019709A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

LOSING OIL PRESSURE DIVERTED FOR 4Z4. LOST POWER 3 MI SHORT. LANDED SANDBAR SHEARED NOSE GEAR. WINGS HIT TREES. (.4)THE CERTIFICATED AIRLINE TRANSPORT PILOT, AND THREE PASSENGERS DEPARTED ON AN AIR TAXI FLIGHT OVER REMOTE TERRAIN.  WHILE IN CRUISE FLIGHT ABOUT 2,200 FEET, THE ENGINE OIL PRESSURE BEGAN TO DROP, AND THE ENGINE OIL TEMPERATURE BEGAN TO RISE.  THE PILOT DECIDED TO DIVERT TO THE NEAREST AIRPORT.  THE ENGINE QUIT RUNNING, AND THE PILOT SELECTED AN EMERGENCY LANDING AREA ON A SAND BAR ALONG A RIVER THAT CONTAINED SEVERAL WILLOW TREES.  DURING THE LANDING, THE AIRPLANE RECIEVED DAMAGE TO THE WINGS AND FUSELAGE.  THE ENGINE HAD ACCRUED 1,491 HOURS SINCE AN OVERHAUL.  DURING THAT TIME, SEVEN ENGINE CYLINDER CHANGES WERE PERFORMED BY COMPANY MAINTENANCE PERSONNEL.  AN EXAMINATION OF THE ENGINE REVEALED THE CRANKSHAFT WAS BROKEN ALONG THE AFT, LOWER DEGE OF THE NUMBER TWO CHEEK JOURNAL.  THE FRACTRUE LINE WAS STRAIGHT AND FLAT, THROUGH THE FULL DIMENSION OF THE NUMBER TWO CHEEK JOURNAL, AND WAS ORIENTED PERPENDICULAR TO THE LONGITUDINAL AXIS OF THE CRANKSHAFT.  THE NUMBER TWO MAIN BEARING WAS BROKEN AND FLATTENED.  THE NUMBER TWO MAIN BEARING SADDLE WAS FLATTENED AND DISTORTE D. THE LEFT AND RIGHT ENGINE CASE HALVES MATING SURFACE EXHIBITED GALLING/FRETTING AT THE NUMBER TWO MAIN JOURNAL BOLT HOLES.                        (-23) THE AIRCRAFT WAS ON A CHARTER FLIGHT, ENROUTE FROM GRAYLING, AK TO BETHEL, AK. APPROXIMATELY 30 MILES WEST OF HOLY CROSS, AK, THE PILOT NOTICED A GRADUAL DROP IN OIL PRESSURE AND RISE IN OIL TEMPERATURE. THE PILOT PROCEEDED TO DIVERT TO HOLY CROSS. APPROXIMATELY 2 MILES NORTH OF HOLY CROSS, THE ENGINE SEIZED AND THE PILOT EXECUTED AN EMERGENCY LANDING ON A SAND BAR. UPON LANDING, THE AIRCRAFT ROLLED THROUGH WILLOW TREES, CAUSING SUBSTANTIAL DAMAGE.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB ANC98LA078](https://openairdocs.org/ntsb/ANC98LA078), Jun 20, 1998: Cessna 207 (N1673U), Holy Cross, AK, substantial damage. Probable cause: The improper installation/undertorquing of the engine crankcase bolts by company maintenance personnel, and a subsequent fracture of the engine crankshaft. A factor in the accident was unsuitable…

## Other reports on N1673U (1)

Matched to the same aircraft by N-number and date.

- [Accident 20111129028059A](https://openairdocs.org/incident/20111129028059A), Nov 29, 2011: Cessna 207 (N1673U), Chuathbalak, AK, Destroyed, 1 fatal. On 11/29/2011 the pilot departed aniak to pick up one passenger at chuathbaluk, Alaska, 10 miles to the east. The weather had beeen below VFR minimums, but at…

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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