DEN83LA202

NTSB accident investigation · Piper PA-11-90 · Babb, MT · August 29, 1983

Accident · No injuriesLimited investigationFinal report
Date
August 28, 1983, 19:15 local (Aug 29, 1983, 01:15 UTC)
Place
Babb, MT
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Enroute
Aircraft
CFGNBPiper PA-11-90
Weather
Visual (VMC) · Day
Status
Completed
Report
Approved by Office Director
Case key
16148

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

On this page

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Loss of engine power(partial) - nonmechanicalCruise - normal
Fuel system - contaminationCause
Fluid,fuel - water
Forced landingDescent - emergency
On ground/water encounter with terrain/waterLanding - roll
Terrain condition - hidden obstruction(s)Factor

Analysis

The pilot said that before takeoff, he fueled the left tank of the aircraft. The right tank was reportedly empty. Five or ten minutes after takeoff the pilot put the acft into a 5 degree left forward slip for about 30 seconds. As soon as the pilot returned the acft to level flight, the engine lost power. The pilot attempted various procedures, but could not restore power to the engine. He made a forced landing on a small pond. As the acft slowed and came off the step, the left float struck submerged willow sticks and sank. The left wing dropped and struck the water. The pilot said that this fuel tank does not have a drain and unless you draw aprx 1 gallon of fuel thru the gascolator, water will not showup.

Aircraft

Registration
CFGNB
Reported as
Piper PA-11-90
Category
Airplane
Serial number
11-1027
Airframe hours
1,300
Engine
Continental C90-8F, 90 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
Kurt Allen Thomas
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · June 5, 1983 · 20 hours before
Departed
Carway, Alberta

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
26
Certificate
Private
Airplane ratings
Single-engine sea
Medical
Class 3, Valid Medical--no waivers/lim.
Seat
Center
Flight hours
200 total · 200 in this make and model · 150 as pilot in command · 30 in the last 90 days

Weather

Conditions
Visual (VMC) · Day
Wind
150° at 12 knots
Visibility
40 statute miles
Lowest ceiling
None
Temperature
81 °F, dew point 52 °F
Altimeter
29.00 inHg
Observed at
FCA, 49 nm away