Sikorsky S-58F N885

Summary

On 16 January 1986 at about 19:05 local time, a Sikorsky S-58F registered N885 was involved in an accident near North Adams, Michigan, United States. One person was on board and nobody was injured. The aircraft was substantially damaged. No probable cause statement is available for this record.

Date

16 January 1986 at 19:05

Classification

Accident

Location

North Adams, Michigan, United States

Coordinates

41.9697, -84.5207

Aircraft

Sikorsky S-58F

Registration

N885

Category

Helicopter

Engines

1

Operator

Not recorded

Operating rule

Part 133: Rotorcraft Ext. Load

Purpose of flight

Other Work Use

Phase of flight

Not recorded

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

CHI86LA067

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

WHILE ACCOMPLISHING PREFLIGHT SYSTEMS CHECKS WITH THE ENGINE RUNNING AND THE ROTOR SYSTEM ENGAGED THE AIRCRAFT EXPERIENCED A HYDRAULIC HARDOVER. UNCOMMANDED DISPLACEMENT OF THE FLIGHT CONTROLS CAUSED THE AIRCRAFT TO PITCH UP AND LEFT SIMULTANEOUSLY. THE PILOT WAS UNABLE TO REGAIN CONTROL BEFORE THE MAIN ROTOR BLADES STRUCK THE GROUND AND THE AIRCRAFT CAME TO REST ON ITS LEFT SIDE. TESTING OF THE HYDRAULIC SYSTEM COULD NOT DUPLICATE THE PROBLEM. TEARDOWN INSPECTION REVEALED FOREIGN MATERIAL IN THE HYDRAULIC CYLINDERS.

Quoted verbatim from the NTSB record.