# NTSB WPR14CA190: Aviat A 1B, N176WW, Hayden, ID, May 15, 2014 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: May 14, 2014, 17:20 local (May 15, 2014, 00:20 UTC) - Place: Hayden, ID - Coordinates: 47.780834, -116.794998 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=47.7808&lon=-116.7950&mi=10 - Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping) - Defining event: [Approach-VFR pattern base: Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report September 2, 2014 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 89212 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR14CA190 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/89212/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=89212 - Page: https://openairdocs.org/ntsb/WPR14CA190 ## Probable cause A partial loss of engine power due to encounter with weather conditions conducive to carburetor icing. Contributing the accident was the pilot's inadequate weather planning. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Performance/control parameters: powerplant parameters](https://openairdocs.org/ntsb-findings/01062050): Aircraft › Aircraft oper/perf/capability · Attain/maintain not possible (probable cause); cases with it: [Aviat A-1B, 1 case](https://openairdocs.org/ntsb-findings/01062050/cases.md?model=2210406), [All aircraft, 81 cases](https://openairdocs.org/ntsb-findings/01062050/cases.md) - [Temp/humidity/pressure: conducive to carburetor icing](https://openairdocs.org/ntsb-findings/03031030): Environmental issues › Conditions/weather/phenomena · Effect on equipment (probable cause); cases with it: [Aviat A-1B, 1 case](https://openairdocs.org/ntsb-findings/03031030/cases.md?model=2210406), [All aircraft, 435 cases](https://openairdocs.org/ntsb-findings/03031030/cases.md) - [Planning/preparation: weather planning](https://openairdocs.org/ntsb-findings/02061020): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Aviat A-1B, 1 case](https://openairdocs.org/ntsb-findings/02061020/cases.md?model=2210406), [All aircraft, 156 cases](https://openairdocs.org/ntsb-findings/02061020/cases.md) - [Object/animal/substance: ground vehicle](https://openairdocs.org/ntsb-findings/03022025): Environmental issues › Physical environment · Contributed to outcome; cases with it: [Aviat A-1B, 1 case](https://openairdocs.org/ntsb-findings/03022025/cases.md?model=2210406), [All aircraft, 132 cases](https://openairdocs.org/ntsb-findings/03022025/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Approach-VFR pattern base: Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342) (defining event); cases with it: [Aviat A-1B, 2 cases](https://openairdocs.org/ntsb-events/342/sequence.md?model=2210406), [All aircraft, 1,858 cases](https://openairdocs.org/ntsb-events/342/sequence.md) - [Approach-VFR pattern base: Off-field or emergency landing](https://openairdocs.org/ntsb-events/440); cases with it: [Aviat A-1B, 5 cases](https://openairdocs.org/ntsb-events/440/sequence.md?model=2210406), [All aircraft, 3,365 cases](https://openairdocs.org/ntsb-events/440/sequence.md) ## Analysis The amphibious airplane was en route to its destination; at time of arrival the temperature was 75 degrees F and the dew point was 43 degrees F. These conditions were conducive to serious carburetor icing at glide power. The pilot stated upon entering the base leg he reduced power and began the descent for landing. While descending he reapplied power to which the engine was unresponsive. Actions by the pilot to restore power were unsuccessful and he initiated an off airport forced landing to a grass field northeast of the airport. Due to insufficient altitude the airplane struck a vehicle before the airplane stalled and impacted the ground. The airplane sustained substantial damage to the right wing and left wing lift strut. The pilot stated he was unsure whether there were any mechanical malfunctions with the engine but did believe the loss of power resulted from carburetor icing. A postaccident engine examination revealed no evidence of preimpact mechanical malfunctions or failures with the engine which would have precluded normal operation. ## Factual narrative The amphibious airplane was en route to its destination; at time of arrival the temperature was 75 degrees F and the dew point was 43 degrees F. These conditions were conducive to serious carburetor icing at glide power. The pilot stated upon entering the base leg he reduced power and began the descent for landing. While descending he reapplied power to which the engine was unresponsive. Actions by the pilot to restore power were unsuccessful and he initiated an off airport forced landing to a grass field northeast of the airport. Due to insufficient altitude the airplane struck a vehicle before the airplane stalled and impacted the ground. The airplane sustained substantial damage to the right wing and left wing lift strut. The pilot stated he was unsure whether there were any mechanical malfunctions with the engine but did believe the loss of power resulted from carburetor icing. A postaccident engine examination revealed no evidence of preimpact mechanical malfunctions or failures with the engine which would have precluded normal operation. ## Aircraft - Registration: [N176WW](https://openairdocs.org/aircraft/N176WW), registered now, S/N 2377, built 2006 (OpenAirDocs) - Reported make and model: AVIAT AIRCRAFT INC A 1B - Registry model: [Aviat A-1B](https://openairdocs.org/model/aviat-a-1b) (registry code 2210406) (OpenAirDocs) - Registry engine: [Lycoming O-360-A1P](https://openairdocs.org/engine/lycoming-o-360-a1p) (registry code 42259, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 2377 - Year built: 2006 - Airframe hours: 346 - Engines: LYCOMING O-360-A1P 180 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, June 20, 2013 - Departed: SFF, SPOKANE, WA - Destination: KCOE, COEUR D'ALENE, ID - Airport: COE, Coeur D'Alene - Pappy Boyingto, runway 20, 5,400 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 73; injuries: none; private; airplane ratings: single-engine sea, single-engine land; instrument ratings: airplane; medical: class 3, with waivers/limitations; last flight review September 20, 2012; seat: front; flight hours: 3,240 total, 300 in this make and model, 3,240 as pilot in command, 20 in the last 90 days, 6 in the last 30 days, 1.5 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 270° at 10 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 75 °F, dew point 43 °F - Altimeter: 30.22 inHg - Icing: Unknown - Observed at: KCOE, 1 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 (OpenAirDocs). - [Accident 20140514007509A](https://openairdocs.org/incident/20140514007509A), May 14, 2014: Aviat Aircraft Inc A-1B, Coeur D'Alene, ID, Substantial damage. Coeur d?alene, ID (kcoe) N176WW, Aviat aircraft A-1B, 17:20 psdt, lost engine power while descending to land. Aircraft descended impacting the ground and slid… ## Docket (5 files) The files NTSB released with the investigation on August 13, 2014, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=89212. 6.4 MB in all. - Pilot-Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 366 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40415052&FileExtension=.PDF&FileName=Pilot-Operator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Map of Accident Area (item 2, .PDF, 243 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40415053&FileExtension=.PDF&FileName=Map%20of%20Accident%20Area-Master.PDF - Engine Examination (item 3, .PDF, 57 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40415054&FileExtension=.PDF&FileName=Engine%20Examination-Redacted.PDF - Carburetor Icing Chart (item 4, .PDF, 41 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40415055&FileExtension=.PDF&FileName=Carburetor%20Icing%20Chart%20-Master.PDF - Photos Accident Site FAA (item 5, .PDF, 5.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40415056&FileExtension=.PDF&FileName=Photos%20Accident%20Site%20FAA%20-Master.PDF 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.