# NTSB CHI93LA357: Boeing A75N1, N54941, Springfield, MO, September 12, 1993

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Limited investigation · Final report
- Date: September 12, 1993, 18:00 local (23:00 UTC)
- Place: Springfield, MO
- Location: 37.2153° N, 93.2982° W: Placed by OpenAirDocs: center of Springfield, MO, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=37.2153&lon=-93.2982&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 2 serious
- Status: Completed, report August 1, 1994
- Report: Approved by Office Director
- NTSB case key (mKey): 9309
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI93LA357
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/9309/pdf
- Page: https://openairdocs.org/ntsb/CHI93LA357

## Probable cause

the disconnection of the primer supply line at the fuel strainer.

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, cruise
  - fuel system,primer system - disconnected (cause)
  - fluid,fuel - exhaustion
- Forced landing, descent - emergency
- In flight collision with terrain/water, descent - emergency

## Analysis

DURING CRUISE, THE PILOT EXPERIENCED A LOSS OF ENGINE POWER.  A FORCED LANDING WAS EXECUTED INTO A CLEARING. EXAMINATION OF THE ENGINE BY AN AIRFRAME AND POWERPLANT MECHANIC SHORTLY AFTER THE ACCIDENT, REVEALED A DISCONNECTION OF THE PRIMER SUPPLY LINE AT THE FUEL STRAINER.

## Factual narrative

On September 12, 1993, about 1800 central daylight time, a Boeing A75N1 airplane, N54941, experienced loss of engine power during cruise and landed off-airport near Springfield, Missouri.  The airline transport pilot and passenger incurred serious injury, and the airplane was substantially damaged in the forced landing.  Visual meteorological conditions existed in the area.  The personal flight originated in Hannibal, Missouri, about 1515 without a flight plan, and operated under 14 CFR 91.

According to the pilot's statement, approximately 45 minutes into the flight after refueling, the engine quit.  He then initiated a forced landing.  The airplane landed in a "flat" attitude on soft, rough terrain.

The airplane was examined by an airframe and powerplant mechanic shortly after the accident.  The mechanic reported finding the primer supply line disconnected at the fuel strainer.  Examination of the line showed the flared end of the primer line had slipped out from the coupling nut and sleeve due to shrinkage of the flare.

## Aircraft

- Registration: [N54941](https://openairdocs.org/aircraft/N54941), registered now, S/N 752705, built 1941 (OpenAirDocs)
- Reported make and model: BOEING A75N1
- Registry model: [Boeing A75N1(PT17)](https://openairdocs.org/model/boeing-a75n1-pt17) (registry code 1380134) (OpenAirDocs)
- Registry engine: [Continental W670 series](https://openairdocs.org/engine/continental-w670-series) (registry code 17018, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 75-2705
- Airframe hours: 2183
- Engines: CONTINENTAL R-670-5 220 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Brian L. Launder
- Registered owner: Brian L. Launder
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, July 2, 1993, 14 hours before
- Departed: HAE, HANNIBAL, MO

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 42; flight instructor, airline transport; airplane ratings: single-engine land, multi-engine sea, single-engine sea, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: rear; flight hours: 5,200 total, 450 in this make and model, 5,000 as pilot in command, 25 in the last 90 days, 17 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 230° at 22 knots, gusting 5
- Visibility: 25 statute miles
- Lowest ceiling: none
- Temperature: 86 °F, dew point 66 °F
- Altimeter: 29.00 inHg

## 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 19930912033769A](https://openairdocs.org/incident/19930912033769A), Sep 12, 1993: Boeing A75N1, Springfield, MO, Substantial damage. Lost power at cruise. Landed in a clearing. Primer fuel supply line became disconnected at fuel strainer.

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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