# NTSB CHI91DTG02: Sikorsky H-19-UH19D, N6735, Mcclusky, ND, June 18, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: June 18, 1991, 08:30 local (13:30 UTC)
- Place: Mcclusky, ND
- Coordinates: 47.480339, -100.439102 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=47.4803&lon=-100.4391&mi=10
- Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report March 31, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 14871
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI91DTG02
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/14871/pdf
- Page: https://openairdocs.org/ntsb/CHI91DTG02

## Probable cause

FAILURE OF THE ENGINE BLOWER/SUPERCHARGER ASSEMBLY.  A FACTOR RELATED TO THE ACCIDENT WAS: NO SUITABLE TERRAIN IN WHICH TO MAKE AN IMMEDIATE EMERGENCY LANDING.

## 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, maneuvering - aerial application
  - eng assembly,blower/impeller/integral supercharger - failure,total (cause)
- Forced landing, maneuvering - turn to landing area (emergency)
  - terrain condition - none suitable (contributing factor)
- Hard landing, descent - uncontrolled

## Analysis

PILOT WAS MAKING A SPRAY RUN ALONG A CANAL APPROXIMATELY 75 FEET BELOW GROUND LEVEL. HE BEGAN TO CLIMB OUT OF THE CANAL. HE LOST ALL POWER AS HE CLEARED THE CANAL EDGE AND MADE A HARD LANDING. THE MAIN ROTOR BLADES SEVERED THE TAIL BOOM ON LANDING. INVESTIGATION REVEALED A FAILURE OF THE BLOWER/SUPERCHARGER SEAL.

## Aircraft

- Registration: [N6735](https://openairdocs.org/deregistered/N6735-2015-10-13), registration cancelled 2015-10-13, S/N 54-1416, built 1971 (OpenAirDocs)
- Reported make and model: SIKORSKY H-19-UH19D
- Registry model: [Sikorsky UH-19D](https://openairdocs.org/model/sikorsky-uh-19d) (registry code 814161G) (OpenAirDocs)
- Registry engine: [Wright R-1300 series](https://openairdocs.org/engine/wright-r-1300-series) (registry code 67060, reciprocating) (OpenAirDocs)
- Category: Helicopter
- Serial number: 54-1416
- Airframe hours: 3100
- Engines: WRIGHT R-1300 700 horsepower reciprocating
- Damage: Substantial damage
- Flight: Aerial application, Part 137
- Operator: Shawn B. Morten
- Registered owner: Shawn B. Morten
- Airworthiness certificate: Special, Restricted (Special)
- Last inspection: Annual, September 30, 1990, 35 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 31; commercial, flight instructor; airplane ratings: single-engine land; medical: class 2, valid medical--no waivers/lim.; seat: right; flight hours: 5,800 total, 150 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 270° at 8 knots
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: 68 °F

## 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 19910618022439A](https://openairdocs.org/incident/19910618022439A), Jun 18, 1991: Orlhel H19DSKRSKY, Mcclusky, ND, Substantial damage. Lost power. Made hard landing. Impact chopped off tailboom engine supercharger seal had failed.

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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