ANC07LA035

NTSB accident investigation · Cessna A185F · Haines, AK · May 2, 2007

Accident · No injuriesLimited investigationFinal report
Date
May 1, 2007, 17:00 local (May 2, 2007, 01:00 UTC)
Place
Haines, AK
Injuries
4 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N185MCessna A185F
Weather
Visual (VMC) · Day
Status
Completed · report July 25, 2007
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
Juneau FSDO-05
FAA report
20070501007469A
Case key
65686

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

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Probable cause

The main landing gear attachment bolts to the right ski sheared during the landing roll in deep snow, resulting in a nose down, and structural damage to the right wing and aileron.

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/malfunctionLanding - roll
Landing gear,main gear attachment - shearedCause
Nose downLanding - roll
Wing,wing rib - buckled
Flight control,aileron - buckled
Terrain condition - snow covered

Analysis

The airplane was being operated by a mountain flying service delivering climbers and their equipment to a glacier base camp, under Title 14, CFR Part 135. The commercial certificated pilot said during the landing roll on the glacier, while turning to the left, the right ski loaded up with snow. He said the ski attachment to the right main landing gear broke, and the gear leg dug into the snow. The airplane nosed down, and the right wing struck the surface of the glacier, damaging the wing and aileron. The pilot said an examination of the landing gear revealed that the ski attaching bolts had sheared. He said he had made several trips to the glacier that day, and that there were no problems with the airplane or the landing gear prior to the accident.

Factual narrative

On May 1, 2007, about 1700 Alaska daylight time, a ski-equipped Cessna A185F airplane, N185M, sustained substantial damage when the right main landing gear broke while landing on a glacier, about 74 miles west of Haines, Alaska. The airplane was being operated by Mountain Flying Service, Haines, as a visual flight rules (VFR) on-demand passenger flight under Title 14, CFR Part 135, when the accident occurred. The commercial certificated pilot, and the three passengers were not injured. Visual meteorological conditions prevailed, and a VFR flight plan was filed. The flight departed the Haines Airport, Haines, about 1600.

During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) on May 2, the pilot said during the landing roll on the glacier, he started a left turn, and the right ski started loading up with snow. He said the ski attachment to the right landing gear broke, and the gear leg dug into the snow. He reported the airplane nosed down, and the right wing struck the surface of the glacier. The pilot said an examination of the landing gear revealed that the ski attaching bolts had sheared, and that the right wing and aileron received structural damage. He said he had made several trips to the glacier that day, and that there were no problems with the gear prior to the accident. Due to the remote location, the airplane was not examined by the NTSB.

Aircraft

Registration
N185M
Reported as
Cessna A185F
Category
Airplane
Serial number
18504264
Airframe hours
9,539
Engine
Continental IO-550-D, 300 horsepower, reciprocating
Damage
Substantial damage
Flight
Part 135
Operator
Mountain Flying Service, doing business as Mountain Flying Service
Registered owner
Paul Swanstrom
Airworthiness certificate
Standard, Normal
Last inspection
Annual · March 1, 2007
Departed
PAHN · Haines, AK
Destination
Haines, AK
Flight plan
VFR

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
52
Injuries
None
Certificate
Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Without waivers/limitations
Last flight review
April 1, 2007
Seat
Left
Flight hours
7,700 total · 7,300 in this make and model · 37 in the last 90 days · 20 in the last 30 days · 5 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
10 statute miles
Lowest ceiling
None
Temperature
39 °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 N185M · 2

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