Airworthiness DirectiveEASA AD CF-2019-11

Aft Fuselage — Rudder Quadrant Support Channel Cracking

Published: Mar 29, 2019
Effective: Apr 5, 2019
Deadline: Apr 5, 2019

Bombardier BD-700 1A10 1A11

AI-generated summary of the official EASA document. Verify against the PDF before acting.

What to do

Operators of affected Bombardier BD-700-1A10 and BD-700-1A11 aircraft must perform initial inspections within specified flight cycle thresholds and continue repetitive inspections every 1000 flight cycles if no cracks are found. If cracks exceed limits, the structural modification must be completed within 100 flight cycles. The modification must be done within 60 months or before 3000 total flight cycles for aircraft with 2900 or fewer cycles, or within 100 flight cycles or 12 months for those with more than 2900 cycles as of April 5, 2019.

Summary

Canadian Airworthiness Directive CF-2019-11 addresses cracking in the rudder quadrant support channel of Bombardier BD-700-1A10 and BD-700-1A11 aircraft, serial numbers 9001 through 9844 and 9998. The directive mandates inspections and structural modifications to prevent fatigue-related deterioration that could cause uncommanded rudder movement or bleed air leakage. This AD applies to specific Bombardier business jet models and aims to ensure continued airworthiness and safety.

What changed

CF-2019-11 introduces mandatory initial and repetitive inspections of the rudder quadrant box assembly for affected Bombardier BD-700-1A10 and BD-700-1A11 aircraft. It also requires a structural modification to the rudder quadrant support channel to terminate the inspection requirements. The AD specifies compliance times based on total flight cycles and provides approved service bulletins for inspections and modifications.

Why it matters

This directive is critical for operators and maintenance organizations to detect and repair fatigue cracks before they compromise flight control systems or environmental controls. Compliance ensures the structural integrity of the rudder quadrant support, preventing potential uncommanded rudder movements and bleed air leaks that could jeopardize flight safety. It also provides clear guidance on inspection intervals and modification deadlines to maintain regulatory compliance.

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