Embraer EMB-120 N198SW

Summary

On 21 May 1997 at about 20:14 local time, a Embraer EMB-120 registered N198SW was involved in an accident near San Diego, California, United States. 17 people were on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

21 May 1997 at 20:14

Classification

Accident

Location

San Diego, California, United States

Nearest airport

Miramar Nas (NKX)

Coordinates

32.9303, -117.0096

Aircraft

Embraer EMB-120

Registration

N198SW

Category

Airplane

Engines

2

Operator

Not recorded

Operating rule

Part 121: Air Carrier

Purpose of flight

Unknown

Phase of flight

Not recorded

Route

Unknown → Los Angeles

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

LAX97FA189

Nobody was injured.

The failure of maintenance personnel to allow adequate time for the engine oil to drain back into the engine oil reservoir prior to adding additional oil, thereby overfilling the reservoir, which resulted in an engine fire and subsequent damage to hydraulic lines and components, including the brakes, which precluded stopping the airplane prior to overrunning the runway end. An additional factor was the confusing and insufficiently defined procedures for servicing the engine oil.

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

Read the full NTSB narrative

After suffering a total loss of power and subsequent fire of the number 2 engine, the Skywest crew made a successful emergency landing. The airplane overran the end of the runway by 1,300 feet, but no additional damage occurred and there were no injuries to the passengers or crew. Immediately prior to the accident flight, a maintenance person added 2.5 quarts of oil to the number 2 engine, when he could not determine the engine's oil level. No evidence was found of any assembly anomalies during the engine hot section inspection, which was performed about 2.3 hours prior to the accident flight. The engine fire resulted from ignition of oil that had leaked across bearing seals. Oil will back flow into the engine rather than drain overboard from the filler neck under overfull operating conditions. The elapsed time between engine shutdown and oil level determination provided by Embraer in its Maintenance Manual are inconsistent with the instructions provided by Pratt & Whitney. The Skywest mechanic may not have allowed adequate elapsed time to permit the oil to drain back into the engine reservoir prior to adding additional oil, thereby overfilling the tank. The clear color of the oil, particularly in a new engine, is difficult to see when determining oil quantity.

Quoted verbatim from the NTSB record.