MOC VTOL.2300(a)(3) Control margin awareness
n/a
(a) A suitable annunciation or indication should be provided to the crew for any flight condition in which commands (e.g. control surfaces, engine RPMs) are approaching their limits (whether or not it is pilot commanded) and that returning to normal flight and/or continuation of safe flight requires a specific crew action.
(b) There should be a direct feedback of the control margin to the flight crew at any time in flight, in nominal and in a failure condition. This control margin is the remaining control available, related to the type of control laws (e.g. attitude command) and the means of control (e.g. torque provided by lift/thrust units). For systems that provide combined thrust and vector control, information should be provided to the crew about which amount of remaining control is available to allow them to take the required actions to fly the aircraft.
(c) In the case of different control margin priorities, they should be clearly indicated to the crew for the current condition (e.g. height hold vs airspeed hold vs bank angle).
(d) It should be taken into account that some pilot-demanded manoeuvres (e.g., rapid roll) are necessarily associated with intended full performance, which may saturate the control. Therefore, simple alerting systems should function in both intended and unexpected flight control-limiting situations and should be properly balanced between the necessary crew-awareness and nuisance alerting. Nuisance alerting should be minimised by proper setting of the warning threshold.
(e) Depending on the application, suitable annunciations may include cockpit flight control position, force, annunciator light, or control position indicators. The term “suitable” indicates an appropriate balance between nuisance and necessary operation. Furthermore, this MOC applies at the limits of flight control authority, not necessarily at the limits of any individual control travel.
Compliance should be shown in conjunction with VTOL.2445 (a), (b), (c), (f) and (g).
VTOL aircraft must provide pilots clear, continuous feedback on available control margin during flight, including failures. Annunciations should indicate approaching control limits, requiring specific crew actions for safe flight. Prioritized control margins must be clearly displayed, balancing necessary alerts with minimizing nuisance warnings during intended maneuvers.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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