# NTSB DEN83LA078: Gulfstream G-164A, N8939H, Cortez, CO, March 10, 1983

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: March 10, 1983, 13:00 local (20:00 UTC)
- Place: Cortez, CO
- Coordinates: 37.34943, -108.569198 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=37.3494&lon=-108.5692&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16051
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN83LA078
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16051/pdf
- Page: https://openairdocs.org/ntsb/DEN83LA078

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Nose over, landing - flare/touchdown
  - landing gear,normal brake system - locked (contributing factor)
  - reason for occurrence undetermined (cause)

## Analysis

THE ACFT NOSED OVER DURING LANDING. ACCORDING TO THE PILOT THE LEFT BRAKE WAS LOCKED AT TOUCHDOWN. TO COMPENSATE THE PILOT APPLIED THE RIGHT BRAKE. THE RAPID STOPPING OF THE ACFT CAUSED IT TO NOSE OVER. THE BRAKING SYSTEM WAS INSPECTED AND NO REASON COULD BE FOUND FOR THE INADVERTANT LOCKING OF THE BRAKE SYSTEM.

## Aircraft

- Registration: N8939H (not matched to a registry record)
- Reported make and model: GULFSTREAM G-164A
- Category: Airplane
- Serial number: 1575
- Airframe hours: 2372
- Engines: P&W R-1340 1340 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Registered owner: Tanner Flying Service
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: 100 hour, March 18, 1983

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 38; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: front; flight hours: 5,000 total, 2,500 in this make and model, 5,000 as pilot in command

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 2 knots
- Visibility: 50 statute miles
- Lowest ceiling: 20,000 ft broken
- Temperature: 55 °F, dew point 30 °F
- Altimeter: 30.00 inHg
- Observed at: FMN, 25 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 19830310007279A](https://openairdocs.org/incident/19830310007279A), Mar 10, 1983: Scwzer G164A, Cortez, CO, Substantial damage. Pilot reported a brake locked on landing. Aircraft nosed over. No brake defects found.

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.

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