EASA SIB CE-10-10: Hawker Beechcraft Model 60 (Duke) Series - Flap System

What to do

Owners and maintenance personnel should thoroughly review the Hawker Beechcraft Duke Model 60 Series Maintenance Manual (P/N 60-590001-25) and Component Maintenance Manual (P/N 60-590001-27) for flap actuator lubrication and overhaul requirements. They should ensure flap system rigging is correct and use MIL-L-6086 Grade M oil and MIL-G-23827 grease as specified. Regular inspection and timely overhaul of flap actuators every 2,000 hours are recommended to maintain system integrity.

Summary

The Special Airworthiness Information Bulletin SAIB: CE-10-10 is an FAA information bulletin addressing the flap control system rigging and flap actuator overhaul for Hawker Beechcraft Model 60 (Duke) Series twin-engine airplanes. It highlights concerns about flap actuator failures that may affect safe operation but does not mandate regulatory action. The document provides guidance on proper maintenance and lubrication practices to ensure flap system reliability.

What changed

This bulletin introduces awareness of flap actuator issues discovered after an accident involving a Hawker Beechcraft Model 60 (Duke), including torsional overload and corrosion on actuator components. It emphasizes the importance of correct flap system rigging, actuator overhaul every 2,000 hours, and the use of specified lubricants as outlined in the maintenance manuals. No new regulatory requirements or Airworthiness Directives are issued at this time.

Why it matters

Proper flap system maintenance is critical for safe aircraft operation, especially to prevent asymmetric flap deployment that can lead to accidents. Operators, maintenance personnel, and compliance teams must understand the risks of improper rigging and lubrication to avoid mechanical failures. Adhering to the recommended maintenance intervals and procedures helps maintain airworthiness and reduces the risk of flap actuator damage.