ANC09LA069

NTSB accident investigation · Cessna 172L · Anchorage, AK · July 18, 2009

Accident · No injuriesLimited investigationFinal report
Date
July 17, 2009, 22:00 local (Jul 18, 2009, 06:00 UTC)
Place
Anchorage, AK
Injuries
2 uninjured
Damage
Substantial damage
Phase of flight
Taxi
Aircraft
N7136QCessna 172L
Defining event
Taxi-from runway: Navigation error
Weather
Visual (VMC) · Day
Status
Completed · report August 12, 2010
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
FAA FSDO-03
FAA report
20090717047959A
Case key
74327

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

On this page

Probable cause

The pilot's unfamiliarity with the airport environment, which resulted in his taxiing the airplane onto a no-taxi section of roadway and into a road sign. Contributing to the accident was the pilot's failure to avail himself of additional information that described the appropriate taxi routes on the airport.

Findings · 3

NTSB’s coded findings. Those marked are part of the probable cause; the rest are factors or other findings. Under each, the cases with the same finding.

Light condition: glareEnvironmental issues › Conditions/weather/phenomena · Contributed to outcomeCessna 172L: 2 casesAll aircraft: 109 cases
Use of equip/info: use of available resourcesPersonnel issues › Task performance · PilotCessna 172L: 1 caseAll aircraft: 41 casesProbable cause
Knowledge: knowledge of proceduresPersonnel issues › Experience/knowledge · PilotCessna 172L: 1 caseAll aircraft: 41 casesProbable cause

Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event is the one that best describes the accident. Under each, the cases with the same event anywhere in their sequence.

Analysis

The pilot said that after landing he was attempting to taxi to another nearby airport to park and was confused by the taxi instructions given by the airport ground controller. He inadvertently taxied onto a roadway and that the setting sun, which was in his eyes, caused him not to see a warning sign on the right side of the roadway; the airplane's right wing then struck the sign. The pilot had exited the runway's parallel taxiway at midfield onto an airplane parking and fueling area. He taxied to a road transiting the parking area, and turned northwest on the road. The road narrowed at the boundary of the parking area and the pilot passed a "No Taxi" sign located on the left side of the road. The route from the runway to parking is along nonmovement areas, and progressive taxi instructions were thus not available. An interactive airport web site with detailed parking information and taxi diagrams was available on the internet. The appropriate route was to proceed west on the parallel taxiway to the taxilane which crosses the road taken by the pilot. The sign the airplane hit had flashing amber lights and warned of the taxilane crossing. A review of the published Federal Aviation Administration Alaska airports supplement for taxi instructions at the airport revealed the "taxiway is a joint use taxi/road and is used by motor vehicles/bicycles/joggers and tour buses."

Factual narrative

On July 17, 2009, about 2200 Alaska daylight time, a Cessna 172L airplane, N7136Q, sustained substantial damage during taxi on the nonmovement area of Lakeshore Drive, Lake Hood Strip, Anchorage, Alaska. The airplane was being operated by the airline transport pilot as a visual flight rules (VFR) personal flight under Title 14, Code of Federal Regulations Part 91, when the accident occurred. The airline transport pilot and sole passenger were not injured. Visual meteorological conditions prevailed, and a VFR flight plan was filed. The flight departed Homer, Alaska, about 2045. During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC) on July 19, the pilot said that he was confused by the taxi instructions given by the airport ground controller, and inadvertently taxied onto a roadway. While proceeding on the roadway, he said the setting sun, which was in his eyes, caused him not to see an aircraft crossing sign on the right side of the roadway. He said he struck the sign with the right wing. The pilot said there were no known mechanical problems with the airplane prior to the accident. The airplane sustained substantial damage to the right wing during the accident. An examination of the accident site by the IIC, showed that the pilot exited the runway's parallel taxiway at midfield into an airplane parking and fueling area. He taxied to a road transiting the parking area, and went northwest on the road. The road narrowed as it exited the boundary of the parking area. At the boundary of the parking area, the pilot passed a "No Taxi" sign on the left side of the road. Additional Information The pilot landed at Lake Hood Strip (Z41) with the expectation of parking his airplane near the terminal at Ted Stevens International Airport (PANC). Although the aerodrome appears to be a single large airport complex, it is three separate airport facilities. A pilot landing at the Lake Hood Strip (Z41), would have to exit the strip boundaries and taxi across Lake Hood Seaplane (LHD) perimeter and park at Alpha transient wheel parking. The route from Lake Hood Strip to Alpha parking is classified by the airports as nonmovement area that is not under the ground controller's jurisdiction, and thus progressive taxi instructions by ground control were not available. The State of Alaska, Department of Transportation, did maintain an interactive airport web site with detailed diagrams available on the Internet. On the site, Lake Hood has a general aviation parking section with information about parking and printable PDF diagrams of the airport. The site also suggests that transient pilots telephone for information before arriving at the airport. The appropriate taxi route from Lake Hood Strip to Alpha parking is to go west on the parallel taxiway to the Lakeshore Taxilane, which crosses the road taken by the pilot. The sign the airplane hit had flashing amber lights, and warned of the Lakeshore Taxilanecrossing. In the immediate area where the accident pilot exited the runway's parallel taxiway, there is transient aircraft parking, and a taxi cab stand with a telephone. A review of PANC tower facility tapes revealed that the pilot did advise he was unfamiliar with the airport, and he was told to taxi northwest around Lake Hood to parking near the base of the tower. A review of the FAA Alaska airports supplement, under the Lake Hood Strip airport, noted the "taxiway around Lake Hood is a joint use taxi/road and is used by motor vehicles/bicycles/joggers and tour buses." The supplement does not diagram the route.

Aircraft

Registration
N7136Q
Reported as
Cessna 172L
Category
Airplane
Serial number
17260436
Airframe hours
4,659
Engine
Lycoming O-320 SERIES, 180 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Smokey Bay AIr, doing business as Smokey Bay Air
Registered owner
Mccann Michelle K
Airworthiness certificate
Standard, Normal
Last inspection
Annual · May 5, 2009
Departed
HOM · Homer, AK
Destination
Z41 · Anchorage, AK
Flight plan
Unknown
Airport
Z41 · Lake Hood Strip, runway 31, 2,200 × 70 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
46
Injuries
None
Certificates
Commercial, Airline transport, Flight instructor
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, With waivers/limitations
Last flight review
June 8, 2009
Seat
Right
Flight hours
7,800 total · 200 in this make and model · 4,000 as pilot in command

Weather

Conditions
Visual (VMC) · Day
Visibility
10 statute miles
Lowest ceiling
6,500 ft broken
Temperature
64 °F, dew point 46 °F
Altimeter
29.88 inHg

Docket · 2

The files NTSB released with the investigation on May 26, 2010, on NTSB’s docket system: statements, records, photos and specialists’ reports. 1.4 MB in all.

FAA reports on this event · 1

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