DEN88DQA03

NTSB accident investigation · Surline Sidewinder · Moriarty, NM · March 12, 1988

Accident · FatalFinal report
Date
March 12, 1988, 12:15 local (19:15 UTC)
Place
Moriarty, NM
Injuries
2 fatal
Damage
Destroyed
Phase of flight
Enroute
Aircraft
N185SASurline Sidewinder
Weather
Visual (VMC) · Day
Status
Completed · report April 25, 1989
Report
Approved by Office Director
FAA report
19880312017749A
Case key
17324

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.

Airframe/component/system failure/malfunctionCruise - normal
Propeller system/accessories - separationCause
Maintenance,installation - improperManufacturerCause
Forced landingDescent - emergency
Loss of control - in flightDescent - emergency
Stall/spin - inadvertentPilot in commandCause

Analysis

Witnesses heard the acft eng sound increase dramatically as the acft passed over a gen aviation airport. The acft was seen by another witness at low atl, estimated to be about 200 ft, as the nose pitched up. The acft then entered a spin and impacted the ground. The investigation revealed that the wooden propeller had separated in flight and it was later found near where the first witness heard the eng sound increase. Examination of the prop show all the bolts that secure the prop to the crankshaft were sheared. The examination further revealed that there was no reinforcing plate between the bolt heads and the wooden prop hub, only the front spinner bulkhead. The front spinner bulkhead showed wear as did the bolt holes in the prop hub.

Aircraft

Registration
N185SA
Reported as
Surline Sidewinder
Category
Airplane, amateur-built
Serial number
212378
Airframe hours
85
Engine
Lycoming O-320, 150 horsepower, reciprocating
Damage
Destroyed
Flight
Personal · Part 91
Registered owner
John Surline
Airworthiness certificate
Special, Experimental (Special)
Departed
RTN · Raton, NM
Destination
TCS · Truth Or Conseq, NM

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
41
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--no waivers/lim.
Seat
Left
Toxicology
Performed
Flight hours
235 total · 85 in this make and model · 23 in the last 90 days · 16 in the last 30 days

Weather

Conditions
Visual (VMC) · Day
Wind
270° at 20 knots
Lowest ceiling
None
Temperature
50 °F, dew point 10 °F
Altimeter
30.00 inHg
Observed at
LVS, 62 nm away

FAA reports on this event · 1

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