# NTSB FTW84FA075: Gulfstream Peregrine, N600GA, El Reno, OK, November 23, 1983

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Field investigation · Final report
- Date: November 23, 1983, 15:00 local (21:00 UTC)
- Place: El Reno, OK
- Coordinates: 35.539325, -97.960189 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=35.5393&lon=-97.9602&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 21088
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW84FA075
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/21088/pdf
- Page: https://openairdocs.org/ntsb/FTW84FA075

## Sequence of events

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

- Loss of control - in flight, maneuvering
  - flt control syst,aileron control - inadequate (cause)
  - remedial action - not possible, pilot in command
  - acft/equip,inadequate airframe, manufacturer (cause)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

AT ABOUT 215 KTS THE PLT ROLLED THE ACFT IN ORDER TO EVALUATE NEWLY INSTALLED AILERONS. IT HAD BEEN NOTED EARLIER THAT A DEAD-BAND EXISTED IN THE AILERON NEUTRAL RANGE THAT INCREASED WITH AIRSPEED. THE PLT STATED THAT UPON ROLLOUT THE DEAD-BAND WAS STRONGER & SLOWED THE RECOVERY WHICH RESULTED IN AN ADDITIONAL ROLL. AS THE ACFT CONTINUED ITS ROLL, THE NOSE-DOWN ATTITUDE INCREASED CAUSING THE ACFT TO ACCELERATE AT AN EVER INCREASING RATE. DURING THE ROLLOUT OF THE SECOND ROLL, THE STICK RESISTANCE CAUSED THE PLT TO PUSH CONSIDERABLY HARDER, INADVERTENTLY PUSHING THE STICK THROUGH NEUTRAL TO THE OPPOSITE SIDE. AN IMMEDIATE AND RAPID AILERON ROLL REVERSAL RESULTED & ANY ACTION THAT THE PILOT TOOK WOULD NOT AFFECT THE RATE OF ROLL OR DESCENT. THE PLT EJECTED BELOW 3000 FT MSL WHILE IN INVERTED FLT.

## Aircraft

- Registration: [N600GA](https://openairdocs.org/deregistered/N600GA-1984-03-22), registration cancelled 1984-03-22, S/N 601 (OpenAirDocs)
- Reported make and model: Gulfstream PEREGRINE
- Registry model: [Gulfstream American PEREGRINE 600](https://openairdocs.org/model/gulfstream-american-peregrine-600) (registry code 3970203) (OpenAirDocs)
- Category: Airplane
- Serial number: 601
- Airframe hours: 242
- Engines: P&W JT-15D-4 2500 lbs thrust turbo fan
- Damage: Destroyed
- Flight: Part 91
- Registered owner: Gulfstream Aerospace Corp.
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: 100 hour, April 20, 1983, 57 hours before
- Departed: PWA, OKLAHOMA CITY, OK

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 55; flight instructor, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 10,763 total, 129 in this make and model, 10,334 as pilot in command, 49 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 320° at 12 knots
- Visibility: 15 statute miles
- Lowest ceiling: 2,000 ft broken
- Altimeter: 29.00 inHg

## 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 19831123058569A](https://openairdocs.org/incident/19831123058569A), Nov 23, 1983: Gulstm PEREGRINE600, El Reno, OK, Destroyed. During test flight aircraft became uncontrollable in an aileron roll and pilot bailed out before crash occurred.

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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