# NTSB FTW90DRD03: Grumman G-164A, N930X, Glynn, LA, February 22, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: February 22, 1990, 13:30 local (19:30 UTC)
- Place: Glynn, LA
- Coordinates: 30.630798, -91.330314 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=30.6308&lon=-91.3303&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report September 29, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 22980
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW90DRD03
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/22980/pdf
- Page: https://openairdocs.org/ntsb/FTW90DRD03

## Probable cause

LOSS OF DIRECTIONAL CONTROL ON THE GROUND, DUE TO INTERMITTENT LOCKING OF THE RIGHT BRAKE DURING THE LANDING ROLL.

## 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)
  - landing gear,normal brake system - locked (cause)
- On ground/water encounter with terrain/water, landing - roll
  - terrain condition - ditch
  - terrain condition - dirt bank/rising embankment

## Analysis

THE AIRPLANE WAS BEING POSITIONED TO A LOCATION FOR AN AG OPERATION. WHILE LANDING ON A ROAD, THE RIGHT TIRE STARTED SKIDDING AND THE AIRPLANE RAN OFF THE RIGHT SIDE OF THE ROAD. IT CROSSED A SMALL DITCH, THEN A DRAINAGE CANAL, AND STOPPED ON THE OPPOSITE BANK OF THE CANAL. INSPECTION REVEALED THAT THE RIGHT BRAKE MASTER CYLINDER ACTUATOR ROD WAS SCORED AND HAD WEAR MARKS, AND THE BRAKE WOULD INTERMITTENTLY STICK, HOLDING PRESSURE ON THE RIGHT BRAKE. THE STICKING WAS CAUSED BY THE PARKING BRAKE LEVER HOLDING ONTO THE WEAR GROOVES.

## Aircraft

- Registration: [N930X](https://openairdocs.org/deregistered/N930X-2013-05-22), registration cancelled 2013-05-22, S/N 442, built 1967 (OpenAirDocs)
- Reported make and model: GRUMMAN G-164A
- Registry model: [Grumman G-164A](https://openairdocs.org/model/grumman-g-164a) (registry code 3952704) (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: 442
- Airframe hours: 5171
- Engines: P&W R-985 450 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 137
- Registered owner: Ted Norris
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, February 7, 1990, 25 hours before
- Departed: NONE, GLYNN, LA
- Airport: NONE

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 41; flight instructor, commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 8,500 total, 450 in this make and model, 8,250 as pilot in command, 15 in the last 90 days, 15 in the last 30 days, 6 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 6 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 66 °F, dew point -0 °F
- Altimeter: 29.00 inHg
- Observed at: BTR, 11 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 19900222002799A](https://openairdocs.org/incident/19900222002799A), Feb 22, 1990: Scwzer G164A, Glynn, LA, Substantial damage. Swerved into a canal after landing on a road to service hopper. Brake cylinder rod worn caught and locked wheel.

## Other investigations on N930X (4)

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 CHI77DET19](https://openairdocs.org/ntsb/CHI77DET19), Jun 24, 1977: Grumman G-164A (N930X), Hebron, IN, substantial damage
- [NTSB FTW74DPG11](https://openairdocs.org/ntsb/FTW74DPG11), Aug 13, 1973: Grumman G-164A (N930X), Dewitt, AR, destroyed
- [NTSB FTW73FPG47](https://openairdocs.org/ntsb/FTW73FPG47), May 14, 1973: Grumman G-164A (N930X), Dewitt, AR, substantial damage
- [NTSB FTW69D0237](https://openairdocs.org/ntsb/FTW69D0237), Sep 16, 1968: Grumman G-164A (N930X), Ferriday, LA, 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.

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