Cessna T210N N9933N

Summary

On 24 June 1992 at about 00:20 local time, a Cessna T210N registered N9933N, operated by Glacier ICE Company, Inc., was involved in an accident near Georgetown, California, United States. 2 people were on board and 2 had minor injuries. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

24 June 1992 at 00:20

Classification

Accident

Location

Georgetown, California, United States

Coordinates

38.9304, -120.7705

Aircraft

Cessna T210N

Registration

N9933N

Category

Airplane

Engines

1

Operator

Glacier ICE Company, Inc.

Operating rule

Part 91: General Aviation

Purpose of flight

Business

Phase of flight

Not recorded

Route

Truckee → Livermore

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

LAX92LA258

2 people had minor injuries.

THE UNDER TORQUE OF THE CRANKCASE THROUGH BOLTS DURING OVERHAUL CAUSING; 1) THE NUMBER 2 MAIN BEARING TO SPIN, 2) THE RESULTANT BLOCKAGE OF THE INTERNAL OIL PASSAGE, AND 3) THE OIL STARVATION INDUCED FAILURE OF THE NUMBER 2 CONNECTING ROD AND CAP. A FACTOR IN THE ACCIDENT WAS THE UNSUITABLE NATURE OF THE TERRAIN WHICH MADE A SUCCESSFUL FORCED LANDING IMPOSSIBLE.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

THE PILOT SAID HE WAS IN CRUISE AT 10,500 FEET WHEN THE OIL PRESSURE WENT TO ZERO AND THE OIL TEMPERATURE ROSE. THE ENGINE QUIT SHORTLY THEREAFTER. THE AIRCRAFT THEN COLLIDED WITH GROUND OBSTRUCTIONS DURING A UPHILL FORCED LANDING ATTEMPT IN MOUNTAINOUS TERRAIN. EXTERNAL EXAMINATION OF THE ENGINE REVEALED THAT THE NUMBER 2 CONNECTING ROD HAD FAILED AND WAS STICKING UP THROUGH THE CASE. INTERNAL EXAMINATION OF THE ENGINE REVEALED THAT THE NUMBER 2 MAIN BEARING HAD SPUN IN THE JOURNAL, WITH SEVERE ABRASION NOTED UNDER THE BEARING INSERTS. THE OIL CHANNEL IN THE NUMBER 2 MAIN BEARING JOURNAL WAS FOUND TOTALLY PLUGGED WITH METAL PARTICLES. PROGRESSIVE HEAT DISCOLORATION AND COMPONENT DISTRESS WAS FOUND DOWNSTREAM IN THE OILING PATH OF THE NUMBER 2 MAIN BEARING. THE ENGINE AND BEARINGS WAS EXAMINED BY A TECHNICAL REPRESENTATIVE FROM CONTINENTAL ENGINES WHO OPINED THAT THE BEARING HAD BEEN INTERMITTENTLY SPINNING ON THE JOURNAL FOR 10 HOURS AND THAT THE FAILURE OF THE NUMBER 2 CONNECTING ROD WAS DUE TO OIL STARVATION CAUSED BY THE RESTRICTIONS IN THE OIL PATH. HE STATED THAT THE MOST LIKELY CAUSE OF THE BEARING SPIN CONDITION WAS UNDER TORQUE OF THE CASE THROUGH BOLTS AT THE NUMBER 2 MAIN BEARING AREA. THE ENGINE WAS OVERHAULED 70 HOURS PRIOR TO THE ACCIDENT.

Quoted verbatim from the NTSB record.