Digital Autopilot for Twin Otter Aircraft

Digital autopilot for Twin Otter aircraft is here. After several months working with Genesys (S-TEC) to gain approval for a new digital three axis autopilot, final flight testing was completed last month in Calgary, using one of Rocky Mountain Aircraft‘s Twin Otters.

The new system was put through its paces in all modes and aircraft configurations and performed flawlessly throughout the flight testing.

STEC 3100
STEC 3100 Installation

The FAA issued the STC SA09761DS on October 06, 2020.

With a list price of just under $25,000 for a full three axis autopilot, the 3100 is cheaper that the two axis limited functionality System 65 autopilot it replaces.

All the components are on condition only, eliminating the costly and time-consuming overhaul of servos that blighted the OEM Collins autopilots installation.

Digital-Flight-Control-System-DFCS
Genesys S-TEC 3100 Digital Flight Control System

The Details

The System is a digital three-axis attitude-based Digital Flight Control System (DFCS), and is designed for installation in aircraft equipped with a dual or single Air Data and Attitude Heading Reference System (ADAHRS), and/or DFCS computer internal sensors.

The System provides roll, pitch and (Optional) yaw modes along with an integral autotrim feature. The autopilot  includes a straight and level recovery feature, as well as envelope protection/alerting features.

The Programmer/Computer provides a means to engage the autopilot, select modes of system operation and to annunciate system modes and status. The Programmer/Computer consists of two sections: roll and pitch. The roll section accepts steering inputs from the navigation radios and the ADAHRS or internal sensors and uses this information to drive the Roll Servo. The pitch section receives signal inputs from the Primary Flight Displays and ADAHRS or internal sensors, and uses this information to drive the Pitch Servo. Yaw axis stabilization is provided by drive commands to a remote mounted Yaw Servo.

The Elevator Trim is automatically controlled by the Trim Servo, which also provides trim annunciation.

Twin Otter Ingenuity and Adaptability

In these unsettling times, we have found that focusing on ingenuity and adaptability has kept us strong and positive.  Regardless of what is happening, we are maintaining our high standards of quality and are appreciating the depth of knowledge in our staff, and the resources that we can rely on.

It turns out that innovation and ingenuity have not been stymied as a result of the pandemic. Developments that were underway have been brought to completion and can now be shared.  See our Emergency Roof Escape Hatch

Adaptability is evidenced in our response to supply chain and logistical challenges, while new Service Bulletin (SB) requirements on top of Covid-19 operational requirements have been met with in-house solutions and resources.  See our Exchange Flight Controls

It may be difficult to be optimistic given the very real challenges faced by our industry, but a “glass half full” look at uncertain times can see opportunities for increased versatility, profitability and reliability in operations.  See our Avionics upgrades

DHC-6 Taking Flight
Twin Otter Taking Flight

Twin Otter Emergency Roof Escape Hatch

For Twin Otter operators who because of regulatory requirement, or operational needs, still have the OEM Viking cabin roof escape hatch. Are you experiencing problems with fitment, delamination or other unserviceability?  Have you had no option but to continuously carry out time consuming repairs as the hatch is no longer available?

Cabin Roof Escape Hatch
RMA-C6FS2413-11

Rocky Mountain Aircraft have recently received TCCA STC approval for a replacement cabin roof escape hatch. The replacement hatch is manufactured from aluminum sheet unlike the OEM balsa core material, so is immune from delamination.

The replacement part RMA-C6FS2413-11 along with the STC are in stock and ready to ship.

AOG for Twin Otter flight controls?

Did you know? Rocky Mountain Aircraft keeps most Twin Otter Flight controls in stock ready for exchange, purchase or as loaners if we are repairing yours.

Viking SERVICE BULLETIN V6/0066 for Aileron Structure Inspection requires borescope inspection equipment that many operators don’t possess and those that do may discover significant repairs required. Minimise aircraft downtime with an economical exchange from Rocky Mountain Aircrafts stock.

Flight Controls
Flight Controls

Spending a fortune on analog instrument repair and gyro overhauls?

The old electro-mechanical instrumentation that has served the Twin Otter fleet well for over fifty years has reached the end of their economical life. Attempting to coax a few more years of service out of these systems is only going to cause heartache and expense. It’s time to invest it reliability and modernity.

Modern avionics systems will increase profitability, versatility and reliability. Isn’t it time your cockpit looked like this?

Avionics Cockpit
Avionics Cockpit