Robinson Helicopter Service Bulletin Targets Governor Controller Upgrades

The maintenance notice affects R44 and R22 series helicopters.

Robinson Helicopters has issued a service bulletin for its R44 and R22 aircraft to address potential issues with certain governor controller upgrades. [Courtesy: Robinson Helicopters]

Robinson Helicopters has issued a service bulletin (SB) for its R44 and R22 aircraft to address potential issues with certain governor controller upgrades.

According to the FAA, service bulletins are issued by aircraft manufacturers to inform owners and operators about "critical and useful information on aircraft safety, maintenance, or product improvement."

The SB, issued June 28, affects controllers with part number D270-1, revisions A through E, that were factory installed on R44 helicopters with serial numbers 2625 through 2751, R44 Cadet helicopters with serial numbers 30061, and 30071 through 30093, and R44 II helicopters with serial numbers 14364, and 14412 through 14640.

According to Robinson, the service bulletin is the result of a concern about the potential for a moisture incursion that may cause a D270-1 governor controller malfunction. This bulletin requires exchanging Revision A through E controllers for Revision F, or subsequent controllers, which incorporate additional moisture protection.

The SB also impacts factory installations on R22 helicopters with serial numbers 4825 through 4887. In addition, the affected governor controllers were also shipped as spares from October 2020 through May 2023.

Robinson Helicopters estimates complying with the service bulletin will cost approximately $1,800 per unit and take two hours.

Once the new governor controller is installed, it should be tested by having an appropriately rated person at the controls perform the starting engine and run-up checklist, per Section 4 of the R44 and R22 pilot's operating handbook. The helicopter should be operated for five minutes to verify proper governor operation.

The engine monitoring unit (EMU) should then be programmed per the R22 and R44 technicians guide, ensuring the host computer has EMU technician's software version 1.0.1.1, released June 2023, or subsequent. Appropriate maintenance record entries should then be made.

The date for compliance with the service bulletin is February 29, 2024.

Meg Godlewski has been an aviation journalist for more than 24 years and a CFI for more than 20 years. If she is not flying or teaching aviation, she is writing about it. Meg is a founding member of the Pilot Proficiency Center at EAA AirVenture and excels at the application of simulation technology to flatten the learning curve. Follow Meg on Twitter @2Lewski.

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