EASA SIB SW-15-08R1: Robinson R44 series and R66 Helicopters — Main Rotor Blades

What to do

Operators should perform a visual inspection of the trailing edge of the main rotor blades on both upper and lower surfaces using 10x magnification, focusing on the area identified in the Robinson service bulletins SB-89 and SB-13. If any damage or cracks are found, the blade must be removed from service immediately. If no damage is detected, the recommended modification to reduce stress concentration should be completed as described in the service bulletins. Positive findings should be reported to Robinson Helicopter Company.

Summary

The Special Airworthiness Information Bulletin SAIB SW-15-08R1 is an FAA information bulletin addressing fatigue cracks in main rotor blades of Robinson Helicopter Company Model R44, R44 II, and R66 helicopters. It specifically concerns MRBs with part numbers C016-7 for R44 and R44 II, and F016-2 for R66 helicopters. The bulletin provides information on inspection and modification recommendations to improve blade safety.

What changed

SAIB SW-15-08R1 updates the previous SAIB SW-15-08 by incorporating Robinson Helicopter Company's service bulletins SB-89 for R44 and SB-13 for R66, which recommend a stress concentration reduction modification to the trailing edge of the main rotor blades. It emphasizes visual inspections for fatigue cracks and introduces a modification to smooth the blade chord transition to reduce localized stresses.

Why it matters

This bulletin is important for aviation professionals because it addresses a potential fatigue crack issue that could lead to in-flight main rotor blade failure, affecting flight safety and control. Operators and maintenance personnel must be vigilant in inspecting and modifying the affected rotor blades to prevent severe vibration and control difficulties. Compliance helps maintain airworthiness and reduces the risk of emergency landings caused by blade failure.

What to do

Summary

What changed

Why it matters

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