# NTSB DEN87FA091: Grumman G-164A, N8369, Lamar, CO, April 8, 1987 - Type: NTSB accident investigation - Classification: Accident · Fatal · Field investigation · Final report - Date: April 8, 1987, 15:45 local (21:45 UTC) - Place: Lamar, CO - Coordinates: 38.07909, -102.61029 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=38.0791&lon=-102.6103&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Highest injury: Fatal - Injuries: 1 fatal, 1 serious - Status: Completed, report May 9, 1988 - Report: Approved by Office Director - NTSB case key (mKey): 17103 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN87FA091 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/17103/pdf - Page: https://openairdocs.org/ntsb/DEN87FA091 ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Midair collision, maneuvering - aerial application - crew/group coordination - not attained, pilot in command (cause) - visual lookout - inadequate, pilot in command (cause) - light condition - sunglare (contributing factor) - visual lookout - inadequate, pilot of other aircraft (cause) - In flight collision with terrain/water, descent - uncontrolled - Midair collision, maneuvering - aerial application - crew/group coordination - not attained, pilot in command (cause) - light condition - sunglare (contributing factor) - visual lookout - inadequate, pilot in command (cause) - visual lookout - inadequate, pilot of other aircraft (cause) - In flight collision with terrain/water, descent - uncontrolled ## Analysis (aircraft 2) THE AIRCRAFT HAD COMPLETED A FORMATION AERIAL APPLICATION OPERATION AND WERE IN THE PROCESS OF SINGLE AIRPLANE SPRAYING AROUND THE PERIMETERS OF A FIELD. THEY COLLIDED AT 10 FEET ABOVE THE GROUND ON PERPENDICULAR FLIGHT PATHS, DESCENDED OUT OF CONTROL AND IMPACTED IN THE LEVEL FIELD. ## Analysis (aircraft 1) THE AIRCRAFT HAD COMPLETED A FORMATION AERIAL APPLICATION OPERATION AND WERE IN THE PROCESS OF SINGLE AIRPLANE SPRAYING AROUND THE PERIMETERS OF A FIELD. THEY COLLIDED AT 10 FEET ABOVE THE GROUND ON PERPENDICULAR FLIGHT PATHS, DESCENDED OUT OF CONTROL AND IMPACTED IN THE LEVEL FIELD. ## Aircraft 1 - Registration: [N8369](https://openairdocs.org/deregistered/N8369-1988-11-23), registration cancelled 1988-11-23, S/N 864 (OpenAirDocs) - Reported make and model: GRUMMAN G-164A - Registry model: [Grumman Acft ENG Cor-Schweizer G-164A](https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164a) (registry code 3952801) (OpenAirDocs) - Category: Airplane - Serial number: 864 - Airframe hours: 4214 - Engines: P&W R1340-AN-1 600 horsepower reciprocating - Damage: Destroyed - Flight: Aerial application, Part 137 - Registered owner: Allen H. Tinnes - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, February 2, 1984, 528 hours before - Departed: LAMAR, CO ## Aircraft 2 - Registration: N4941Y (not matched to a registry record) - Reported make and model: PIPER PA-25-260 - Category: Airplane - Serial number: 25-4742 - Airframe hours: 1583 - Engines: LYCOMING O-540-G1A5 260 horsepower reciprocating - Damage: Destroyed - Flight: Aerial application, Part 137 - Registered owner: Allen H. Tinnes - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, May 10, 1986 - Departed: LAMAR, CO ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot, aircraft N8369; age 41; commercial; airplane ratings: multi-engine land, single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: center; toxicology performed; flight hours: 5,620 total, 5,140 in this make and model, 5,500 as pilot in command, 20 in the last 90 days, 6 in the last 24 hours - Pilot, aircraft N4941Y; age 35; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: center; toxicology performed; flight hours: 2,000 total, 2,000 in this make and model, 2,000 as pilot in command, 30 in the last 90 days, 6 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 210° at 8 knots - Visibility: 35 statute miles - Lowest ceiling: none - Temperature: 64 °F, dew point 21 °F - Altimeter: 29.00 inHg - Observed at: LHX, 52 nm away ## FAA reports on this event (2) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 19870408069921A](https://openairdocs.org/incident/19870408069921A), Apr 8, 1987: Scwzer G164A, Lamar, CO, Destroyed. The aircraft hit N4941Y during agricultural spray operations. Both pilots failed to see and avoid each other. - [Accident 19870408069922A](https://openairdocs.org/incident/19870408069922A), Apr 8, 1987: Piper PA25260, Lamar, CO, Destroyed, 1 fatal. The aircraft hit N8369 during agricultural spray operations. Both pilots failed to see and avoid each other. ## Other investigations on N8369 (2) 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 FTW80FRD25](https://openairdocs.org/ntsb/FTW80FRD25), Apr 25, 1980: Grumman G-164A (N8369), Lake Arthur, LA, substantial damage - [NTSB MIA78FKQ32](https://openairdocs.org/ntsb/MIA78FKQ32), Aug 14, 1978: Grumman G-164A (N8369), Charleston, MS, 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.