Piper PA-18-150 N4355Z

Summary

On 8 February 1989 at about 21:10 local time, a Piper PA-18-150 registered N4355Z, operated by Boulder Flying Service, was involved in an accident near Boulder, Colorado, United States. 2 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

8 February 1989 at 21:10

Classification

Accident

Location

Boulder, Colorado, United States

Nearest airport

Boulder Municipal (1V5)

Coordinates

40.0192, -105.2506

Aircraft

Piper PA-18-150

Registration

N4355Z

Category

Airplane

Engines

1

Operator

Boulder Flying Service

Operating rule

Part 91: General Aviation

Purpose of flight

Instructional

Phase of flight

Not recorded

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

DEN89LA074

Nobody was injured.

FAILURE OF THE DUAL STUDENT TO MAINTAIN DIRECTIONAL CONTROL AND THE FAILURE OF THE PILOT IN COMMAND (CFI), TO PROVIDE ADEQUATE REMEDIAL ACTION IN A TIMELY MANNER, TO CORRECT THE SWERVE. A SECOND PROBABLE CAUSE WAS THE CFI'S FAILURE TO PROVIDE ADEQUATE SUPERVISION DURING THE LANDING ROLL. INADEQUATE CREW COORDINATION IS CONSIDERED A FACTOR.

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

Read the full NTSB narrative

THE ATP RATED CFI WAS PERFORMING A RENTAL CHECKOUT WITH A PRIVATE PLT. THE CHECK PLT TOLD THE PLT TO MAKE A LANDING AND 'IF SUFFICIENT RUNWAY REMAINED,' TO MAKE ANOTHER TAKEOFF. A LANDING WAS COMPLETED ON RWY 8R, A 4,100 X 75 FT ASPHALT RWY. THE CHECK PILOT HAD BEEN FOLLOWING THROUGH ON THE CONTROLS BUT DURING THE LANDING ROLL HE RELEASED THE CONTROLS AND WAITED FOR THE PLT TO STOP. HE SAID THAT AS SOON AS HE REMOVED HIS HANDS FROM THE CONTROLS, THE STICK WENT FORWARD AND HE HEARD THE ENGINE SPEED UP. THE AIRPLANE SWERVED TO THE LEFT. THE CHECK PLT TOOK THE CONTROLS AND ATTEMPTED TO CORRECT THE SWERVE, TO NO AVAIL. THE PLANE STRUCK A SNOW DRIFT ON THE LEFT SIDE OF THE RWY AND NOSED OVER.

Quoted verbatim from the NTSB record.