ASN Wikibase Occurrence # 363272
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| Date: | Tuesday 21 July 1992 |
| Time: | 18:45 LT |
| Type: |  Embraer EMB-120 RT |
| Owner/operator: | Mesa Airlines, Inc. |
| Registration: | N221YV |
| MSN: | 120.221 |
| Total airframe hrs: | 3928 hours |
| Engine model: | P&W PW-118A |
| Fatalities: | Fatalities: 0 / Occupants: 26 |
| Aircraft damage: | None |
| Category: | Serious incident |
| Location: | Denver, CO -
 United States of America
|
| Phase: | Approach |
| Nature: | Unknown |
| Departure airport: | Durango, CO (KDRO) |
| (KDEN) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
THE CAPTAIN WAS FLYING THE AIRPLANE WITH HIS RIGHT HAND RESTING ON THE POWER CONTROLS. AS THE AIRPLANE TURNED ONTO FINAL APPROACH, IT ENCOUNTERED TURBULENCE OF SUFFICIENT INTENSITY THAT THE CAPTAIN'S FEET CAME OFF THE RUDDER PEDALS. HE FELT A 'CLICK' IN HIS HAND AND 'THERE WAS AN INSTANTANEOUS PROPELLER OVERSPEED.' THE ENGINE WAS EVENTUALLY SECURED BY CLOSING THE FUEL SHUTOFF VALVE AND AN UNEVENTFUL NO FLAP LANDING WAS MADE. POST INCIDENT EXAMINATION DISCLOSED BOTH AIR GROUND CIRCUIT BREAKERS WERE OPEN. THE LEFT ENGINE WAS FOUND TO BE FUNCTIONALLY DESTROYED. A READOUT OF THE DIGITAL FLIGHT DATA RECORDER DISCLOSED THE MAXIMUM LEFT AND RIGHT PROPELLER RPM VALUES ATTAINED WERE 150.49% AND 120.4%, RESPECTIVELY. VERTICAL ACCELERATION VALUES RANGED FROM .647 TO 1.26 G'S, AND LONGITUDINAL ACCELERATION VALUES RANGED FROM .037 TO .096 G'S. THE RIGHT ENGINE TORQUE PEAKED AT 37%, WHILE THE LEFT ENGINE TORQUE REMAINED AT 0%. RIGHT ENGINE FUEL FLOW WAS 16% TO 19% LOWER THAN LEFT ENGINE FUEL FLOW, AND PROPELLER IMBALANCE VALUES FOR THE LEFT ENGINE WAS APPROXIMATELY 50% HIGHER THAN THOSE RECORDED FOR THE RIGHT ENGINE.
Probable Cause: OPEN AIR GROUND CIRCUIT BREAKERS THAT ALLOWED THE PROPELLERS TO OVERSPEED. A FACTOR WAS: CLEAR AIR TURBULENCE.
Accident investigation:
 |
|
Sources:
NTSB DEN92IA074
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 18-Mar-2024 15:26 | ASN Update Bot | Added |
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