Även om den inte adresserar partiell urkoppling, ger denna SB orsakerna till att krafter på kontrollkolumner kan användas för att koppla ur autopiloten.
Airbus Service Bulletin (sb) Nej A300-22-6021 säger
2) Objective/Action To provide autopilot disengagement by applying a 15 daN force on the control column in go-around mode above 400 feet (radio altitude) this Service Bulletin recommends to modify the software at both flight control Computers.
The modified Flight Control Computers will also include improvements which have been identified from the last standard.
(3). Advantages
Operational benefit and/or passenger comfort by :
- autopilot disengagement by 15 daN force on control column during go-around above 400 feet (radio altitude),
- avoidance of unwanted atopilot disengagement when the pilot takes firmly the control column,
- nose dowm improvement to avoid the pitch attitude increase after main landing gear touch down,
- improvement of "LEVEL CHANGE" mode; to avoid the "VMO" overshoot,
- "ALT HOLD" mode improvement in heavy turbulence.
- improvement of autopilot capacity to counteract strong vertical gust in cruise.
OBS!. 15 daN = 15 deca-Newtons = 150 Newtons = ~ 34 lbs.