Grumman SCAN TYPE 30 N7775C

Summary

On 5 August 1983 at about 13:37 local time, a Grumman SCAN TYPE 30 registered N7775C was involved in an accident near Fond du Lac, Wisconsin, United States. 3 people were on board and 2 had minor injuries. The aircraft was destroyed. No probable cause statement is available for this record.

Date

5 August 1983 at 13:37

Classification

Accident

Location

Fond du Lac, Wisconsin, United States

Nearest airport

Lake Winnebego (OSH)

Coordinates

44.0207, -88.6193

Aircraft

Grumman SCAN TYPE 30

Registration

N7775C

Category

Airplane

Engines

2

Operator

Not recorded

Operating rule

Part 91: General Aviation

Purpose of flight

Instructional

Phase of flight

Not recorded

Route

Oshkosh → Unknown

Aircraft damage

Destroyed

Weather

VMC

Light

Day

NTSB number

CHI83FA362

2 people had minor injuries.

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

AFTER TAKEOFF, THE AIRCREW FLEW TO THE SOUTHERN END OF LAKE WINNEBAGO WHERE THEY MADE SEVERAL UNEVENTFUL WATER LANDINGS. THEY ESTIMATED THAT THE WIND WAS FROM THE NORTHEAST AT 5 TO 6 KTS. THE WATER WAS DESCRIBED AS SMOOTH WITH ONLY SMALL RIPPLES. ON THE 6TH APCH, THE GEAR HANDLE WAS CHECKED IN THE UP POSITION & THE AMBER GEAR UP INDICATOR LIGHT WAS ILLUMINATED. THE AMPHIBIOUS ACFT TOUCHED DOWN ON THE WATER WITH NO BOUNCE OR PORPOISE. ABOUT 2 OR 3 SECONDS AFTER TOUCHDOWN, THE ACFT YAWED VIOLENTLY TO THE RIGHT & ROLLED LEFT. THE LEFT FLOAT & WING TIP HIT THE WATER & THE LEFT WING SEPARATED. THE HULL ROLLED OVER, BUT THE OCCUPANTS EGRESSED BEFORE THE ACFT SANK. A DIVER NOTED THAT THE RIGHT GEAR WAS EXTENDED. AFTER THE ACFT WAS RECOVERED, THE RIGHT MAIN GEAR ACTUATOR ROD CLEVIS WAS FOUND TO HAVE FRACTURED. THE FRACTURE SURFACE HAD SIGNS OF OVERLOAD FAILURE. THE LOCK NUT HAD BEEN SCREWED TIGHTLY AGAINST THE CLEVIS & THE LOCK NUT THREADS HAD PRODUCED GOUGE MARKS ON THE UNTHREADED PORTION OF THE SHANK OF THE CLEVIS.

Quoted verbatim from the NTSB record.