Document ID: chunk:federal_register_of_legislation:F2009L03896:body:0:p2
Version: federal_register_of_legislation:F2009L03896
Segment Type: other
Provision Reference: 
Character Range: 2902–4329

these short field operations are conducted from airports that are located in mountainous terrain or in close proximity to bodies of water, leaving fewer margins for error, e.g. landing long or at (too) high speed.

                The effects of deceleration and landing inertia loads can cause uncommanded movement of the airbrake selector lever from the "lift spoiler" position to the "airbrakes out" position, causing the lift spoilers to retract during the landing roll.

                This condition, if not corrected, would increase the landing distance, possibly resulting in a runway overrun and consequent injury to aeroplane occupants.

                On certain BAe 146 aeroplanes, without modifications HCM00889A and B or modifications HCM00889A and C incorporated, negligible force is required to move the airbrake lever back to the "airbrakes out" position.  From 1988 onwards, modifications were introduced on the production line to incorporate a modified friction baulking device such that a force of 12 lbs must be applied to move the airbrake lever from the "lift spoiler" position to the "airbrakes out" position.  These modifications were also made available as an optional in-service retrofit.

                For the reasons described above, this AD requires the modification of the airbrake lever detent mechanism.

David Villiers
Delegate of the Civil Aviation Safety Authority

9 October 2009