- Date
- July 24, 2002, 07:45 local (13:45 UTC)
- Place
- Two Buttes, CO
- Injuries
- 1 uninjured
- Damage
- Substantial damage
- Phase of flight
- Landing
- Aircraft
- N5416Grumman G-164A
- Weather
- Visual (VMC) · Day
- Status
- Completed · report April 1, 2003
- Report
- Approved by Office Director
- Parties
- Federal Aviation Administration
- FAA report
- 20020724021399A
- Case key
- 55366
From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.
On this page
Probable cause
the failure of the right main landing wheel master brake cylinder and the subsequent inadvertent ground loop during the landing roll by the pilot.
Sequence of events
NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.
Analysis
The pilot said that he was landing with a load of herbicide. During the landing roll, the airplane started to veer to the left. The pilot said he applied right rudder and right brake, but the airplane did not respond. The airplane ground looped to the left, and the right main landing gear separated from the airplane. He said all four wings appeared wrinkled, but the lower right wing was bent up. Postaccident investigation of the right brake revealed that its master brake cylinder had failed.
Factual narrative
On July 24, 2002, at 0745 mountain daylight time, a Grumman G-164A, N5416, was substantially damaged when the airplane ground-looped while landing at Doyle's Airfield, Two Buttes, Colorado. The commercial pilot, the sole occupant in the airplane, was not injured. The airplane was being operated by the pilot under Title 14 CFR Part 137. Visual meteorological conditions prevailed for the local aerial application flight which originated approximately 30 minutes before the accident. The pilot had not filed a flight plan.
The pilot said that he was landing with a load of herbicide. During the landing roll, the airplane started to veer to the left. The pilot said he applied right rudder and right brake, but the airplane did not respond. The airplane ground looped to the left, and the right main landing gear separated from the airplane. He said all four wings appeared wrinkled, but the lower right wing was bent up.
Postaccident investigation of the right brake revealed that its master brake cylinder had failed.
Aircraft
- Registration
- N5416
- Reported as
- Grumman G-164A
- Category
- Airplane
- Serial number
- 1030
- Airframe hours
- 8,152
- Engine
- Pratt & Whitney R1340, 600 horsepower, reciprocating
- Damage
- Substantial damage
- Flight
- Aerial application · Part 137
- Registered owner
- Vic L. Doyle
- Airworthiness certificate
- Special, Restricted (Special)
- Last inspection
- Annual · July 15, 2002 · 5 hours before
- Departed
- NONE · Two Buttes, CO
- Airport
- NONE · Doyle's Airfield, runway 180, 2,640 × 60 ft, grass/turf
Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.
Flight crew
As NTSB recorded them. NTSB leaves out names.
- Role
- Pilot
- Age
- 36
- Injuries
- None
- Certificate
- Commercial
- Airplane ratings
- Single-engine land
- Medical
- Class 2, Valid Medical--no waivers/lim.
- Last flight review
- July 15, 2002
- Seat
- Center
- Flight hours
- 1,700 total · 300 in this make and model · 1,600 as pilot in command · 140 in the last 90 days · 40 in the last 30 days · 4 in the last 24 hours
Weather
- Conditions
- Visual (VMC) · Day
- Wind
- 190° at 10 knots
- Visibility
- 10 statute miles
- Lowest ceiling
- None
- Temperature
- 75 °F, dew point 57 °F
- Altimeter
- 30.20 inHg
- Observed at
- SPD, 11 nm away
Docket · 1
The files NTSB released with the investigation on December 10, 2002, on NTSB’s docket system: statements, records, photos and specialists’ reports. 281 KB in all.
FAA reports on this event · 1
The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.
Other investigations on N5416 · 2
Matched to the same aircraft by N-number and date.