# NTSB MKC83FU004: Mattison MAC 300, Brewster, KS, July 6, 1983

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Final report
- Date: July 5, 1983, 19:15 local (Jul 6, 1983, 00:15 UTC)
- Place: Brewster, KS
- Coordinates: 39.359619, -101.369827 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.3596&lon=-101.3698&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): 33360
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC83FU004
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33360/pdf
- Page: https://openairdocs.org/ntsb/MKC83FU004

## Sequence of events

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

- Loss of control - in flight, maneuvering
  - flight control,rudder - disconnected (contributing factor)
  - aircraft preflight - improper, pilot in command (cause)
  - rudder - not corrected, pilot in command (cause)
  - stall/spin - inadvertent, pilot in command (cause)
- In flight collision with terrain/water, descent - uncontrolled
  - terrain condition - crop (contributing factor)

## Analysis

THE ULTRALIGHT WENT OUT OF CONTROL AND DOVE IN A COCKSCREW SPIRAL TO THE GROUND. THE VEHICLE DID NOT MOVE AFTER IMPACT. THE ACFT WAS AT ABOUT 200 FT AGL WHEN WITNESSES SAW IT DIP THE RIGHT WING AND START A SPIN WHICH WAS DESCRIBED AS A CORKSCREW. IT MADE 4 OR 5 REVOLUTIONS BEFORE HITTING THE GROUND. THE SHERIFF TOOK A PICTURE WHICH SHOWS THAT THE UPPER HINGE CLEVIS ON THE RUDDER POST IS NOT CONNECTED TO THE RUDDER SUPPORT POST. THE PIN IS IN THE SUPPORT POST CLEVIS. THE VEHICLE WAS HANGERED IN A SHED THAT REQUIRED THE RUDDER BE REMOVED TO HANGER IT. THE PILOT SAID HE INSTALLED THE RUDDER BEFORE THE ACCIDENT FLT.

## Aircraft

- Registration: UNREG (not matched to a registry record)
- Reported make and model: MATTISON MAC 300
- Category: Ultralight
- Airframe hours: 20
- Engines: KAWASAKI TA340A-F202 30 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 103
- Registered owner: Donald L. Hawkins, Sr.
- Airport: 5KSO, Hutton, runway 14, 4,000 × 200 ft, grass/turf

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 54; airplane ratings: single-engine land; medical: unknown; seat: center; flight hours: 330 total, 20 in this make and model, 290 as pilot in command, 20 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: variable at 5 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 81 °F

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.