Wsk Pzl Mielec M-18A N5198Y

Summary

On 8 July 2002 at about 00:50 local time, a Wsk Pzl Mielec M-18A registered N5198Y, operated by Bureau of Land Management, was involved in an accident near Fillmore, Utah, United States. One person was on board and one had minor injuries. The aircraft was destroyed. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

8 July 2002 at 00:50

Classification

Accident

Location

Fillmore, Utah, United States

Coordinates

37.1808, -109.8799

Aircraft

Wsk Pzl Mielec M-18A

Registration

N5198Y

Category

Airplane

Engines

1

Operator

Bureau of Land Management

Operating rule

Public Use

Purpose of flight

Public Use

Phase of flight

Not recorded

Route

Fillmore → Fillmore

Aircraft damage

Destroyed

Weather

VMC

Light

Day

NTSB number

DEN02TA069

1 person had minor injuries.

the pilot's failure to follow proper procedures/directives, and the airplane's inability to climb while maneuvering after takeoff. Factors contributing to the accident were improperly mixed aerial application materials (fire retardant slurry), the high aircraft weight and balance, and the pilot's diverted attention.

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

The airplane took off and was en route to a nearby forest fire. The pilot said the takeoff roll was "a little longer" than usual, which he attributed to the high temperature. He noticed a lower propeller rpm (1 to 2 inches) and manifold pressure, and the airplane was in a 50 to 100 foot per minute rate of descent. He realized he needed to jettison the retardant, and made several unsuccessful attempts to use the emergency jettison handle. While his attention was diverted to jettisoning the load, the airplane collided with terrain. The pilot failed to disengage the emergency release (jettison) handle-locking lever prior to takeoff as required by the Pilot Operating Handbook. He also chose not to arm the hydraulic power for the retardant gate prior to takeoff. When examined at the accident site, the slurry mixture was of a "very thick consistency." The pilot said he mixed and loaded the slurry, called Fire-Trol, into the airplane. The slurry consisted of ammonium phosphate, a clay thickener, corrosion inhibitor, and colorant. A sample of the slurry, removed from the sealed pump hose, was tested and found to be LCA-R (concentrated retardant unmixed with water). The sample weighed 12.2 pounds per gallon, slightly heavier than pure concentrate (12.1 pounds per gallon). No water was found in the sample. When properly mixed, the slurry concentrate should weigh 9.13 pounds per gallon. The airplane's hopper held 400 gallons. A properly mixed load should weigh 3,652 pounds. It was computed that the hopper's payload weighed 4,880 pounds at the time of the accident, a difference of 1,228 pounds.

Quoted verbatim from the NTSB record.