EASA SIB CE-20-10
Textron Aviation Inc. Hawker 750, 800, 800XP, 850XP and 900XP Airplanes - Air Distribution System - Loss of Cabin Pressure
Summary
The Special Airworthiness Information Bulletin SAIB: CE-20-10 is an FAA information bulletin addressing a potential loss of cabin pressure issue in Textron Aviation Inc. Hawker 750, 800, 800XP, 850XP, and 900XP series airplanes. It highlights reports of sudden disconnections in the air distribution system ducts and sleeves that can cause rapid cabin altitude changes. This bulletin is informational and does not mandate corrective action under 14 CFR part 39.
What Changed
This bulletin introduces awareness of an airworthiness concern involving the air cycle machine discharge ducts and water separator connections in the specified Hawker models. It identifies the root cause as loose or improperly torqued clamps on rubber coupling sleeves and recommends maintenance practices to prevent recurrence. No new regulatory requirements or airworthiness directives are issued at this time.
Why It Matters
This information is important for operators, maintenance technicians, and inspectors to prevent potential loss of cabin pressure events that could affect flight safety. Proper clamp torque and inspection can avoid sudden duct disconnections that lead to rapid cabin altitude changes. Ensuring compliance with maintenance manual torque specifications helps maintain aircraft airworthiness and operational safety.
What To Do
Affected stakeholders should carefully follow the hose clamp torque requirements specified in the Aircraft Maintenance Manual sections 21-10-15, 21-10-87, and 21-10-95. After any maintenance disturbing the air conditioning ducts or rubber sleeves, clamps should be checked for correct torque as soon as possible, preferably near the lower 50-hour inspection limit rather than waiting up to 300 hours. Operators should monitor for any signs of duct disconnection and report issues accordingly.