Incident Overview
The Air Accidents Investigation Branch (AAIB) published a bulletin addendum concerning an incident involving a Fokker F28 Mark 0100, registration G-BYDN. The event occurred on 3 November 2000 at 1945 hours UTC while the aircraft was approaching Paris Charles de Gaulle Airport.
Missing Figure
The addendum was necessitated by the omission of Figure 5 from the original report published in AAIB Bulletin 8/2001. The figure, now included, illustrates the modification to servo motor capstan cable grooves as specified in Service Bulletins SBF100-22039 and SBF100-22-047. The modification involves changes to the groove design on the capstan of the elevator autopilot servo motor.
Elevator Control System Context
The original report included Figure 4, which depicts the elevator controls in the bullet fairing, including push-pull rods, elevator booster control unit, cable tension regulator, servo drive cables, elevator autopilot servos, and flight control lock. Figure 5 complements this by detailing the specific modification to the servo motor capstan.
Service Bulletin Details
Service Bulletins SBF100-22039 and SBF100-22-047 describe the modification to the servo motor capstan cable grooves. The figure compares the original current groove with the modified groove. This modification was likely intended to address a specific issue, though the source does not state the reason for the change or its relation to the incident.
Conclusion
The AAIB Bulletin Addendum EW/C2000/11/02 ensures completeness of the original report by providing the omitted figure. No other details of the incident, such as injuries, damage, or causal factors, are discussed in this addendum.