# NTSB MKC85LA028: Cessna 421B, N41097, Mason City, IA, November 27, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: November 27, 1984, 14:05 local (20:05 UTC)
- Place: Mason City, IA
- Coordinates: 43.149658, -93.190208 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.1497&lon=-93.1902&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 5 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 33894
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC85LA028
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33894/pdf
- Page: https://openairdocs.org/ntsb/MKC85LA028

## Sequence of events

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

- Loss of control - in flight, approach
  - weather condition - icing conditions (contributing factor)
  - preflight planning/preparation - improper, pilot in command (cause)
  - anti-ice/deice system,empennage - inadequate (contributing factor)
  - flight into known adverse weather - initiated, pilot in command (cause)
  - stall/mush - inadvertent, pilot in command (contributing factor)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

THE ATP PIC KNEW THAT HE WOULD BE FLYING INTO AREA OF SURFACE ICING. BOOTS ON HORIZONTAL STABILIZER DID NOT REMOVE ICE. OVER RWY AT 30 FT, ACFT STALLED & HIT THE RWY HARD. MANUFACTORER STATES ACFT CANNOT BE CERTIFIED FOR FLT INTO KNOWN ICING. DEICE AND ANTI-ICE EQUIPMENT WAS INSTALLED AT THE FACTORY DURING MANUFACTURE.

## Aircraft

- Registration: N41097 (not matched to a registry record)
- Reported make and model: CESSNA 421B
- Category: Airplane
- Serial number: 421B0447
- Airframe hours: 1973
- Engines: CONTINENTAL GTSIO-520-H 375 horsepower reciprocating
- Damage: Substantial damage
- Flight: Part 135
- Operator: Skytrak Aviation
- Registered owner: A Liner 8 Aviation Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, November 11, 1984, 14 hours before
- Departed: MCW, CHICAGO, IL
- Destination: MCW, MASON CITY, IA
- Flight plan: IFR
- Airport: MCW, Minicipal, runway 35, 6,504 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 49; airline transport; airplane ratings: multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 2,104 total, 124 in this make and model, 1,942 as pilot in command, 62 in the last 90 days, 5 in the last 24 hours

## Weather

- Conditions: Instrument (IMC), Day
- Wind: 280° at 13 knots
- Lowest ceiling: 600 ft
- Temperature: 30 °F, dew point 30 °F
- Altimeter: 29.00 inHg
- Observed at: MCW

## 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 19841127066229A](https://openairdocs.org/incident/19841127066229A), Nov 27, 1984: Cessna 421B, Mason City, IA, Substantial damage. Stalled, hard landing, collapsed right main and nose gears. Ice on horizontal stabilizer. Not certified for icing.

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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