# NTSB SEA94LA193: Grumman G-164B, N48571, Wilder, ID, July 19, 1994 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: July 19, 1994, 08:20 local (14:20 UTC) - Place: Wilder, ID - Coordinates: 43.799884, -116.910194 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=43.7999&lon=-116.9102&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report March 13, 1995 - Report: Approved by Office Director - NTSB case key (mKey): 41986 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA94LA193 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/41986/pdf - Page: https://openairdocs.org/ntsb/SEA94LA193 ## Probable cause THE FAILURE OF THE LEFT BRAKE MASTER CYLINDER AND THE PILOT'S INADEQUATE REMEDIAL ACTION WHEN THE AIRCRAFT COLLIDED WITH AN EMBANKMENT DURING AN INTENTIONAL 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 - landing gear,normal brake system - failure,partial (cause) - remedial action - inadequate, pilot in command (cause) ## Analysis DURING ROLLOUT AFTER LANDING, THE PILOT DETERMINED THAT THE LEFT BRAKE HAD FAILED. HE ATTEMPTED AN INTENTIONAL GROUND LOOP TO AVOID A BANK BY A DITCH. THE LEFT LANDING GEAR COLLAPSED AND THE LEFT LOWER WING SUSTAINED IMPACT DAMAGE WHEN THE AIRCRAFT IMPACTED THE DIRT BANK. AFTER THE ACCIDENT, THE AIRCRAFT OWNER DETERMINED THAT THE LEFT BRAKE MASTER CYLINDER HAD FAILED DUE TO INTERNAL CORROSION. ## Factual narrative On July 19, 1994, approximately 0820 mountain daylight time, a Grumman G-164B, N48571, sustained substantial damage while landing at a private airstrip near Wilder, Idaho. The commercial pilot, the sole occupant of the aircraft, was uninjured. Visual meteorological conditions prevailed for the flight, which was engaged in aerial application. There was no ELT installed in the aircraft. The pilot stated that during landing the left brake failed. He attempted an intentional ground loop, during which the left wing impacted a dirt bank, bending the wing spar and collapsing the left main landing gear. After the accident, the owner/pilot determined that the left brake master cylinder had failed due to internal corrosion. ## Aircraft - Registration: [N48571](https://openairdocs.org/deregistered/N48571-2009-09-25), registration cancelled 2009-09-25, S/N 82B, built 1976 (OpenAirDocs) - Reported make and model: GRUMMAN G-164B - Registry model: [Grumman Acft ENG Cor-Schweizer G-164B](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164b) (registry code 3952802) (OpenAirDocs) - Registry engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 82B - Engines: P&W R-985 AN-14B 450 horsepower reciprocating - Damage: Substantial damage - Flight: Aerial application, Part 137 - Operator: Carol E. Hibbs - Registered owner: Carol E. Hibbs - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, January 4, 1994, 742 hours before - Airport: runway 27, 2,500 × 20 ft, gravel ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: front; flight hours: 10,756 total, 6,757 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: 330° at 8 knots - Visibility: 50 statute miles - Lowest ceiling: none ## 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 19940719019279A](https://openairdocs.org/incident/19940719019279A), Jul 19, 1994: Scwzer G164B, Wilder, ID, Substantial damage. Left brake failed landing. Ground looped to avoid ditch and dirt bank. Left brake master cyl failed due corrosion. ## Other investigations on N48571 (1) 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 LAX08LA177](https://openairdocs.org/ntsb/LAX08LA177), Jun 13, 2008: Grumman-Schweizer G-164B (N48571), Wilder, ID, substantial damage. Probable cause: The loss of engine power as a result of failure of the supercharger. Contributing to the accident was the lack of suitable terrain for the forced landing. 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.