# NTSB MIA92LA029: WSK PZL Mielec PZL-M-18, N4506K, Florida City, FL, November 15, 1991

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Limited investigation · Final report
- Date: November 15, 1991, 15:00 local (20:00 UTC)
- Place: Florida City, FL
- Coordinates: 25.270196, -80.629135 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=25.2702&lon=-80.6291&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report April 27, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 33031
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA92LA029
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/33031/pdf
- Page: https://openairdocs.org/ntsb/MIA92LA029

## Probable cause

PARTIAL LOSS OF ENGINE POWER DUE TO A LOOSE INTAKE MANIFOLD.  ALSO, IMPROPER MAINTENANCE BY AN UNKNOWN PERSON.

## Sequence of events

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

- Loss of engine power(partial) - nonmechanical, maneuvering - aerial application
  - induction air control,intake manifold - loose (cause)
  - maintenance - improper, unknown (cause)
- In flight collision with terrain/water, descent - emergency
  - terrain condition - rising

## Analysis

AFTER MANEUVERING, THE ENG EXPERIENCED A NEAR TOTAL LOSS OF POWER. THE PLT APPLIED FULL THROTTLE BUT THE ENG FAILED TO RESPOND.  HE OPENED THE VALVE TO DUMP THE CHEMICAL & WHILE DESCENDING, THE ACFT COLLIDED WITH RISING TERRAIN.  THE ACFT THEN CAME TO REST IN A FIELD. EXAM OF THE ENG ASSY REVEALED THAT THE INTAKE MANIFOLD ATTACHED TO THE BOTTOM OF THE OIL SUMP WAS LOOSE.  THIS ALLOWED AN EXCESSIVELY LEAN FUEL/AIR MIXTURE WHICH WAS VERIFIED BY VISUAL EXAMINATION OF THE SPARK PLUGS.  REVIEW OF THE ENG LOGBOOK REVEALED THAT THE ENG WAS INSTALLED ON APRIL 5, 1989.  THERE WERE NO ENTRIES INDICATING THAT THE CARBURETOR ASSY WAS REMOVED SINCE THE ENG WAS INSTALLED.

## Aircraft

- Registration: [N4506K](https://openairdocs.org/deregistered/N4506K-1995-07-03), registration cancelled 1995-07-03, S/N 1Z01105 (OpenAirDocs)
- Reported make and model: WSK PZL Mielec PZL-M-18
- Registry model: [Wsk-Pzl-Mielec PZL-M-18](https://openairdocs.org/model/wsk-pzl-mielec-pzl-m-18) (registry code 9810102) (OpenAirDocs)
- Category: Airplane
- Serial number: 1Z011-05
- Engines: WSK PZL-KALISZ reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Fable Spray Service, Inc.
- Registered owner: Ives, Larry & Garry
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, April 1, 1991

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 57; commercial; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: front; flight hours: 6,731 total, 300 in this make and model, 6,000 as pilot in command, 40 in the last 90 days, 25 in the last 30 days, 4 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 90° at 18 knots
- Lowest ceiling: none

## 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 19911115062789A](https://openairdocs.org/incident/19911115062789A), Nov 15, 1991: Wsk PZLM18, Florida City, FL, Substantial damage. Lost power on takeoff. Dumped load,crash landed. Loose intake manifold improperly installed minus a gasket.

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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