# NTSB MKC84IA185: Swearingen SA226TC, N233AM, Joplin, MO, June 27, 1984

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: June 27, 1984, 07:32 local (12:32 UTC)
- Place: Joplin, MO
- Coordinates: 37.079612, -94.499572 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=37.0796&lon=-94.4996&mi=10
- Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 15 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 33575
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC84IA185
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33575/pdf
- Page: https://openairdocs.org/ntsb/MKC84IA185

## Sequence of events

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

- Airframe/component/system failure/malfunction, takeoff - roll/run
  - landing gear,normal brake system - binding(mechanical) (cause)
  - parking brakes - not selected
  - maintenance - inadequate, company maintenance personnel (cause)
  - landing gear,normal brake system - overtemperature (cause)
- Airframe/component/system failure/malfunction, cruise - normal
  - landing gear,tire - burst
  - landing gear,normal retraction/extension assembly - disabled
  - landing gear,emergency extension assembly - engaged
  - emergency procedure - performed, pilot in command

## Analysis

WHILE TAXIING TO TAKEOFF & ON THE TAKEOFF ROLL, THE LEFT BRAKE OVERHEATED. TEN TO FIFTEEN MINS AFTER DEPARTURE BOTH TIRES ON THE LEFT MAIN LANDING GEAR EXPLODED. THE BEARINGS AND BRAKES ALSO SEIZED DUE TO THE HIGH TEMPERATURES. UPON ARRIVAL AT THE DEST, THE NORMAL GEAR EXTENSION SYSTEM WAS INOPERATIVE AND THE EMERGENCY EXTENSION SYSTEM WAS UTILIZED. NO FURTHER DAMAGE WAS INCURRED DURING THE LANDING.INVESTIGATORS DISCOVERED A STICKING VALVE IN THE LEFT PARKING BRAKE. MAINTENANCE RECORDS REVEALED THAT ON JUNE 19 AND 22, DIFFICULTY WAS REPORTED IN RELEASING THE PARKING BRAKES; MAINTENANCE PERSONNEL COULD NOT DUPLICATE THE DISCREPANCY AND RETURNED THE ACFT TO SERVICE.

## Aircraft

- Registration: [N233AM](https://openairdocs.org/deregistered/N233AM-1990-06-20), registration cancelled 1990-06-20, S/N TC319 (OpenAirDocs)
- Reported make and model: SWEARINGEN SA226TC
- Registry model: [Swearingen SA226TC](https://openairdocs.org/model/swearingen-sa226tc) (registry code 8780404) (OpenAirDocs)
- Category: Airplane
- Serial number: TC-319
- Airframe hours: 9829
- Engines: AIRESEARCH TPE 331-3UW 940 horsepower turbo prop
- Damage: Minor damage
- Flight: Part 135
- Operator: Air Midwest (Amwa)
- Registered owner: First Security Bank Of Utah
- Airworthiness certificate: Standard, Normal
- Last inspection: Continuous airworthiness, June 22, 1984, 35 hours before
- Departed: TUL, TULSA, OK
- Flight plan: IFR
- Airport: JLN, Joplin Muni, runway 31, 6,503 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 35; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 4,000 total, 3,000 in this make and model, 8 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 70° at 11 knots
- Visibility: 15 statute miles
- Lowest ceiling: 10,000 ft broken
- Temperature: 68 °F, dew point 63 °F
- Altimeter: 29.00 inHg
- Observed at: JLN

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Incident 19840627032059I](https://openairdocs.org/incident/19840627032059I), Jun 27, 1984: Swrngn SA226TC, Joplin, MO, Substantial damage. Both left main landing gear tires exploded in wheel well due to excessive brake heat. Inner strut damage on rollout

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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