Harper/Cricri MK-12 N42JH

Summary

On 18 May 1984 at about 16:35 local time, a Harper/Cricri MK-12 registered N42JH was involved in an accident near Longmont, Colorado, United States. One person was on board and one died. The aircraft was destroyed. No probable cause statement is available for this record.

Date

18 May 1984 at 16:35

Classification

Accident

Location

Longmont, Colorado, United States

Nearest airport

Longmont Muni (2V2)

Coordinates

40.1692, -105.1093

Aircraft

Harper/Cricri MK-12

Registration

N42JH

Category

Airplane

Engines

2

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Personal

Phase of flight

Not recorded

Aircraft damage

Destroyed

Weather

VMC

Light

Day

NTSB number

DEN84FTE01

1 person died.

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 HOMEBUILT ACFT WAS ON DOWNWIND LEG OF THE TRAFFIC PATTERN, AFTER INITIAL TAKEOFF, WHEN IT WENT INTO A DIVE & COLLIDED WITH THE GROUND. A WITNESS SAID HE HEARD A POWER REDUCTION BEFORE THE DIVE & POWER ADDED AGAIN AS IT STARTED DOWN. THE PLT'S SON SAID HIS FATHER HAD CONTROL FLUTTER PROBLEMS AT SPEEDS ABOVE 100 MPH. THIS WAS VERIFIED BY A LOGBOOKENTRY. BY REDUCING SPEED, THE FLUTTER WENT AWAY. THUS, THE FLAPERON (AILERON) PUSH RODS WERE MODIFIED BY THE PLT. THE MODIFICATION CONSISTED OF A DOUBLER, 2 BEARINGS & A 1 INCH HOLE TO RETAIN THE BEARINGS. DURING A POST ACCIDENT INSPECTION, IT WAS FOUND THAT THE BELLCRANK ARM HAD SEPARATED FROM THE BEARING. IT WAS FOUND THAT THE DRILLED HOLE WAS IRREGULAR & LARGE ENOUGH TO ALLOW THE BEARING TO SLIP THRU THE HOLE. THE BEARING WAS THE ONLY MEANS OF RETAINING THE BELLCRANK TO THE FULCRUM POINT. THE RIGHT AILERON AT THE ACCIDENT SCENE WAS SEPARATED FROM THE MAIN WRECKAGE AND THE CONTROL PUSH RODS TO THE ELEVATOR WERE BROKEN AT THE BRACKET ATTACHED TO THE ELEVATOR.

Quoted verbatim from the NTSB record.