ANC87FA095

NTSB accident investigation · Piper PA-18 · Sheep Mountain, AK · July 12, 1987

Accident · Serious injuriesField investigationFinal report
Date
July 11, 1987, 19:45 local (Jul 12, 1987, 03:45 UTC)
Place
Sheep Mountain, AK
Injuries
1 serious, 2 minor
Damage
Substantial damage
Phase of flight
Maneuvering
Aircraft
N159TPiper PA-18
Weather
Day
Status
Completed · report May 2, 1988
Report
Approved by Office Director
NTSB office
Alaska Regional Office
FAA report
19870711038779A
Case key
4777

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 control - in flightManeuvering
Weather condition - low ceilingFactor
Airspeed(vso) - not maintainedPilot in commandCause
Terrain condition - mountainous/hillyFactor
Altitude - improperPilot in commandFactor
Judgment - poorPilot in commandCause
Flight into known adverse weather - continuedPilot in commandFactor
In-flight planning/decision - improperPilot in commandFactor
In flight collision with terrain/waterDescent - uncontrolled

Analysis

The pilot and his two passengers took off in a two place Piper PA-18 from a glacier after doing repair work on an aircraft that had crashed there earlier. Weather conditions were deteriorating as they approached their destination airstrip located in a nearby Mountain pass. The ceiling was estimated at 200 feet AGL, and visibility as between 1/2 and 3 miles. The pilot said that he felt intimidated by the low clouds and rising terrain surrounding the airstrip and that he inadvertently stalled the aircraft while turning from downwind to base leg.

Aircraft

Registration
N159T
Reported as
Piper PA-18
Category
Airplane
Serial number
18-2273
Engine
Lycoming O-320, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Business · Part 91
Registered owner
Cumin L. Wiles
Airworthiness certificate
Standard, Normal
Last inspection
Annual · July 15, 1986 · 50 hours before
Departed
Matanuska Gal, AK
Destination
SMU · Sheep Mt. Lodge, AK
Airport
SMU · Sheep Mountain, runway 22, 2,200 × 50 ft, gravel

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
33
Certificates
Commercial, Flight instructor
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Expired
Seat
Front
Flight hours
872 total · 38 in this make and model · 795 as pilot in command · 45 in the last 90 days · 6 in the last 24 hours

Weather

Conditions
Day
Wind
240° at 7 knots
Lowest ceiling
200 ft overcast
Temperature
57 °F, dew point -0 °F

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.

Other investigations on N159T · 1

Matched to the same aircraft by N-number and date.