# NTSB ANC07CA075: Cessna 180, N7741A, Skwentna, AK, August 8, 2007 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: August 7, 2007, 17:30 local (Aug 8, 2007, 01:30 UTC) - Place: Skwentna, AK - Coordinates: 61.666667, -151.53334 - Nearby events: https://openairdocs.org/map.md?lat=61.6667&lon=-151.5333&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report October 31, 2007 - Report: Approved by Office Director - NTSB office: Alaska Regional Office - NTSB case key (mKey): 66496 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ANC07CA075 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/66496/pdf - Page: https://openairdocs.org/ntsb/ANC07CA075 ## Probable cause The failure of the left brake, and the pilot's continued operation with a known defect (the left brake), which resulted in a loss of control during the landing roll, and an on ground encounter with terrain. A contributing factor to the accident was the pilot's inadvertent ground loop. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of control - on ground/water, landing - roll - ground loop/swerve - inadvertent, pilot in command (contributing factor) - landing gear,normal brake system - failure,partial (cause) - operation with known deficiencies in equipment - continued, pilot in command (cause) - On ground/water encounter with terrain/water, landing - roll - terrain condition - ground ## Analysis The commercial certificated pilot was delivering supplies to his lodge on a private, 1,200 foot long, dirt airstrip under Title 14, CFR Part 91, when the accident occurred. He said when he landed the left brake failed, and as he approached the end of the airstrip, he attempted a 180-degree turn, but the airplane ground-looped, and struck the right wing on the ground. The pilot said that on previous flights he had to pump-up the left brake due to a leaking master cylinder. The airplane sustained structural damage to the right wing during the accident. ## Factual narrative The commercial certificated pilot was delivering supplies to his lodge on a private, 1,200 foot long, dirt airstrip under Title 14, CFR Part 91, when the accident occurred. He said when he landed the left brake failed, and as he approached the end of the airstrip, he attempted a 180-degree turn, but the airplane ground-looped, and struck the right wing on the ground. The pilot said that on previous flights he had to pump-up the left brake due to a leaking master cylinder. The airplane sustained structural damage to the right wing during the accident. ## Aircraft - Registration: [N7741A](https://openairdocs.org/aircraft/N7741A), registered now, S/N 32638, built 1956 (OpenAirDocs) - Reported make and model: Cessna 180 - Registry model: [Cessna 180](https://openairdocs.org/model/cessna-180) (registry code 2072602) (OpenAirDocs) - Registry engine: [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series) (registry code 17026, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 32638 - Airframe hours: 9800 - Engines: Continental O-470 reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Mark Miller - Airworthiness certificate: Standard, Normal; Standard, Utility - Last inspection: Annual, July 1, 2007 - Departed: Z41, Lake Hood Strip, AK - Destination: Skwentna, AK ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 57; injuries: none; commercial; airplane ratings: single-engine sea, single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review May 1, 2007; seat: front; flight hours: 14,000 total, 6,000 in this make and model, 120 in the last 90 days, 40 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 360° at 10 knots, gusting 15 - Visibility: 50 statute miles - Lowest ceiling: none - Temperature: 61 °F, dew point 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 (OpenAirDocs). - [Accident 20070808018189A](https://openairdocs.org/incident/20070808018189A), Aug 8, 2007: Cessna 180, Skwentna, AK, Substantial damage. (-23) Lost right brake on landing causing a ground loop, damaging a wing and wing spar. 08/21/07: 8020-23 completed this date and not expected to be amended. ## Other investigations on N7741A (5) 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. - [NTSB ANC26LA061](https://openairdocs.org/ntsb/ANC26LA061), Jun 20, 2026: Cessna 180 (N7741A), Skwentna, AK, substantial damage, investigation ongoing - [NTSB ANC24LA018](https://openairdocs.org/ntsb/ANC24LA018), Mar 10, 2024: Cessna 180 (N7741A), Skwentna, AK, substantial damage. Probable cause: The pilot’s failure to maintain directional control while taxiing, which resulted in a collision with trees. - [NTSB ANC73AA017](https://openairdocs.org/ntsb/ANC73AA017), Aug 20, 1972: Cessna 180 (N7741A), Holy Cross, AK, substantial damage - [NTSB ANC67A0049](https://openairdocs.org/ntsb/ANC67A0049), Dec 21, 1966: Cessna 180 (N7741A), Bethel, AK, substantial damage - [NTSB UNK64X0573](https://openairdocs.org/ntsb/UNK64X0573), Feb 15, 1964: Cessna 180 (N7741A), Kasigluk, AK, substantial damage 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.