Nihon YS-11A-500 N906TC

Summary

On 13 January 1987 at about 18:54 local time, a Nihon YS-11A-500 registered N906TC was involved in an incident near Remmington, Indiana, United States. 3 people were on board and nobody was injured. The aircraft was slightly damaged. No probable cause statement is available for this record.

Date

13 January 1987 at 18:54

Classification

Incident

Location

Remmington, Indiana, United States

Coordinates

40.7591, -87.1504

Aircraft

Nihon YS-11A-500

Registration

N906TC

Category

Airplane

Engines

2

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Instructional

Phase of flight

Not recorded

Route

Indianapolis → Lafayette

Aircraft damage

Minor

Weather

VMC

Light

Day

NTSB number

CHI87IA061

Nobody was injured.

The NTSB has not published a probable cause for this record. No probable cause statement is present in the source data.

Nothing about the cause is stated here that is not in the source record.

Read the full NTSB narrative

THE FLIGHT CREW FAILED TO ADHERE TO APPROPRIATE PROCEDURES AND DIRECTIVES WHEN THEY FAILED TO SELECT THE HP COCK LEVERS TO THE HSWL (LOCK OUT) POSITION WHILE PERFORMING AN APPROACH TO LANDING STALL DURING A TRAINING/TEST FLIGHT. WHEN STALL RECOVERY WAS INITIATED, BOTH PROPELLERS 'HUNG UP' WHEN THE HIGH (CRUISE PITCH) STOPS OF EACH PROPELLER FAILED TO WITHDRAW. AS THE POWER LEVERS WERE ADVANCED, TURBINE GAS TEMPERATURES (TGT'S) EXCEEDED LIMITATIONS; THE LEFT PROPELLER AUTO-FEATHERED, THE RIGHT PROPELLER WAS LATER FEATHERED BY THE CAPTAIN. RESTART PROCEDURES WERE ATTEMPTED WITHOUT SUCCESS, AND A FORCED LANDING IN A PLOWED CORNFIELD ENSUED. EXAMINATION OF THE ENGINES REVEALED THAT THE TURBINES HAD BEEN 'SUBJECTED TO SEVERE (AND DESTRUCTIVE) THERMAL DEGRADATION DURING OPERATION' AS A RESULT OF THE PROPELLERS BEING CONSTRAINED DURING LOW SPEED OPERATIONS. TESTING OF THE RELAYS REVEALED THAT THE HIGH STOP WITHDRAWAL RELAY FOR THE RIGHT PROPELLER FUNCTIONED INTERMITTENTLY.

Quoted verbatim from the NTSB record.