NOAA Twin Otter – Drop Chute Modification

Project Overview:
Performed all engineering tasks for the design and structural substantiation of a new drop chute for the NOAA Twin Otter aircraft

National Oceanic and Atmospheric Administration (NOAA)

Services Performed:
PEI provided design, analysis, DER approval, and installation support for development of the drop chute modification for the Twin Otter (DHC-6)

Structural Analysis andĀ  FAA DER Approval:

  • Generated system level finite element models, baseline and modified
  • Calculated of drop chute drag loads
  • Performed quasi-static analysis for aerodynamic and limit maneuver loadsĀ 
  • Performed global equivalency and detailed stress analysis, including mechanical joints (bolted and riveted)
  • Provided DER review and approval via FAA Form 8110-3

Engineering Design:

  • Conducted site survey to measure and document Twin Otter (DHC-6) aircraft
  • Modeled local aircraft structure in the aft baggage compartment area
  • Designed preliminary reinforcements for drop chute cutout and installation
  • Designed preliminary drop chute components
  • After structural evaluation, completed detail design of drop chute and reinforcing structures
  • Conducted Design Reviews with NOAA engineers
  • Generated all detail part, assembly, and installation drawings

Deploying atmospheric dropsonde from Twin Otter drop chute: