# NTSB ANC06LA067: Cessna 182, N21545, Chenega Bay, AK, June 2, 2006 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: June 2, 2006, 14:30 local (22:30 UTC) - Place: Chenega Bay, AK - Coordinates: 59.801944, -147.893051 - Nearby events: https://openairdocs.org/map.md?lat=59.8019&lon=-147.8931&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report January 31, 2007 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - Parties: FAA-AL-ANC FSDO 03 - NTSB case key (mKey): 63828 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC06LA067 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/63828/pdf - Page: https://openairdocs.org/ntsb/ANC06LA067 ## Probable cause A loss of engine power for an undetermined reason while maneuvering at low level over a beach, which resulted in an in-flight collision with rough terrain and a nose over. A factor in the accident was the rough/uneven terrain. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, maneuvering - low pass - performed, pilot in command - reason for occurrence undetermined (cause) - Forced landing, descent - emergency - In flight collision with terrain/water, emergency landing - terrain condition - rough/uneven (contributing factor) - Nose over, emergency landing ## Analysis The private certificated pilot reported that he was looking for potential landing areas near a cabin on a remote island during a cross-country Title 14, CFR Part 91 personal flight. He scanned an area at 400 feet above ground level (agl) for about 15 to 20 minutes. The airplane was configured with 20 degrees of flaps, carburetor heat on, and an engine power setting of about 18 to 20 inches of manifold pressure. The outside temperature was 52 degrees F. He spotted the cabin he was looking for, and began a descent for a low-level pass along a beach. The pilot configured the airplane to full flaps, the engine power was near idle, and the carburetor heat was "on." He then attempted to add engine power to level the airplane, but it did not respond. He pushed the throttle in and out several times without any change in power from idle. The airplane continued to descend, and as the wheel began to strike low brush, the engine went to full power, but the airplane touched down in the rough terrain and nosed over. The airplane received structural damage to the fuselage and wings. In the Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1) submitted by the pilot, he indicated that during the flight to the island, the engine developed a slight roughness, accompanied by about a 1 inch drop in manifold pressure. He noted the carburetor temperature gauge was indicating -35 degrees F. He applied carburetor heat, which raised the carburetor heat temperature to about 0 degrees F, but no further. The pilot said he then decreased the engine power to idle, reapplied carburetor heat, and noted that after about 1 minute, the carburetor temperature increased to about 55 degrees F, which resolved the engine roughness. The pilot reported that he previously had a carburetor heat problem about 8 months prior to the accident. After a normal landing at an airport, he applied engine power to takeoff, but the engine would only produce about 14 inches of manifold pressure with the carburetor heat on. After several seconds of idling the engine with full carburetor heat applied, full power was restored. The pilot indicated that the airplane had an annual inspection in February, 2006, and he had flown the airplane for about 120 hours without a repeat of the problem. The airplane was recovered from the island, but the engine was not examined by FAA or NTSB personnel. ## Factual narrative On June 2, 2006, about 1430 Alaska daylight time, a wheel-equipped Cessna 182 airplane, N21545, sustained substantial damage when it collided with rough terrain during a low pass over a remote landing area on Montague Island, about 17 miles southeast of Chenega Bay, Alaska. The airplane was being operated as a visual flight rules (VFR) cross-country personal flight under Title 14, CFR Part 91, when the accident occurred. The airplane was operated by the pilot. The private certificated pilot, the sole occupant, was not injured. Visual meteorological conditions prevailed, and a VFR flight plan was filed. The flight originated at Merrill Field, Anchorage, Alaska, about 1300, and the destination was Montague Island. During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), on June 5, the pilot reported that he was looking for potential landing areas near a cabin located at San Juan Bay, on the southwest coast of the island. Once at the island, he scanned the area of the bay at 400 feet above ground level (agl) for about 15 to 20 minutes. The airplane was configured with 20 degrees of flaps, carburetor heat on, and an engine power setting of about 18 to 20 inches of manifold pressure. The outside temperature was 52 degrees F. He then climbed to 600 feet agl and spotted the cabin he was looking for, and began a descent for a low-level pass along a beach. The pilot indicated that he configured the airplane for a landing approach from 600 feet, and planned to descend to tree-top level, parallel to a sandy beach, checking to see if the area was suitable for a nose wheel-equipped airplane. The pilot said the airplane had full flaps, the engine was near idle, and the carburetor heat was "on." His track over the ground placed the airplane over rough terrain consisting of brush and driftwood. The pilot said he attempted to add engine power to level the airplane, but it did not respond. He pushed the throttle in and out several times without any change in power from idle. The airplane continued to descend and as the wheel began to strike low brush, the engine went to full power, but the airplane touched down in the rough terrain and nosed over. The airplane received structural damage to the fuselage and wings. In the Pilot/Operator Aircraft Accident Report (NTSB Form 6120.1) submitted by the pilot, he indicated that during the flight to Montague Island, the engine developed a slight roughness, accompanied by about a 1 inch drop in manifold pressure. He noted the carburetor temperature gauge was indicating -35 degrees F. He applied carburetor heat, which raised the carburetor heat temperature to about 0 degrees F, but no further. The pilot said he then decreased the engine power to idle, reapplied carburetor heat, and noted that after about 1 minute, the carburetor temperature increased to about 55 degrees F, which resolved the engine roughness. The pilot reported that he previously had a carburetor heat problem about 8 months prior to the accident. After a normal landing at an airport, he applied engine power to take off, but the engine would only produce about 14 inches of manifold pressure with the carburetor heat on. After several seconds of idling the engine with full carburetor heat applied, full power was restored. The pilot indicated that the airplane had an annual inspection in February, 2006, and he had flown the airplane for about 120 hours without a repeat of the problem. The pilot said that after the accident, he checked to see that the emergency locator transmitter (ELT) was activated, but he was not sure if any signal was emanating from the antenna which was under the overturned airplane. He then activated his personal locator beacon (PLB), to which the U.S. Coast Guard responded with a rescue helicopter. The pilot and his dog were transported to Valdez, Alaska. The airplane was recovered from the island, but the engine was not examined by FAA or NTSB personnel. ## Aircraft - Registration: [N21545](https://openairdocs.org/deregistered/N21545-2009-02-09), registration cancelled 2009-02-09, S/N 18261706, built 1973 (OpenAirDocs) - Reported make and model: Cessna 182 - Registry model: [Cessna 182P](https://openairdocs.org/model/cessna-182p) (registry code 2075816) (OpenAirDocs) - Registry engine: [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series) (registry code 17026, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 18261706 - Airframe hours: 6920 - Engines: Continental O-470 230 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Joseph V. Riggs - Airworthiness certificate: Standard, Normal - Last inspection: Annual, February 1, 2006, 119 hours before - Departed: PAMR, Anchorage, AK - Destination: Chenega Bay, AK - Flight plan: VFR ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 34; injuries: none; private; airplane ratings: single-engine land; medical: class 2, without waivers/limitations; seat: left; flight hours: 227 total, 138 in this make and model, 181 as pilot in command ## Weather - Conditions: Visual (VMC), Day - Visibility: 20 statute miles - Lowest ceiling: none - Temperature: 52 °F ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20060602012489A](https://openairdocs.org/incident/20060602012489A), Jun 2, 2006: Cessna 182P, Chenega Bay, AK, Substantial damage. (-23) While attempting a landing from 600 ft MSL pilot reduced power to 12 inches of manifold pressure, increased propeller RPM to full and lowered flaps to 40… From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.