Hi everybody !I've started reading all through the AOM of the JS41, so I'll know what I'll do when flying this fantastic bird. Of course, some new doubts came up to me, and so I need a little help.a) What's the APR (Automatic Performance Reserve) ? Is it a sort of help for pilots in best performing the a/c during take off and/or climb and/or cruise ? How should I set it ?b ) What is the "relight" ? c) How does the Airframe De-icing system function ? How and when should I use it ?d) And, in the end, a stupid question...I know what it is, but I really can't remember where it is...I'm talking about the Engine Ignition, the manual talks about keeping it ON, as an example, during a t/o in icing conditions (pg. 49) :blush:Thanks very much for your help,Hallo

Re your questions on APR and Relight:1 - APR, or Automatic Performance Reserve should be active for takeoff and landing ONLY. APR senses if an engine flames out and automatically increases the available horsepower from the remaining live engine, using the fuel enrichment system. It will increase the torque from the engine to 113% of what was set, although this is limited to the 100% red line. It will also raise the EGT limit by 40'c to prevent operation of the Torque and Temperature Limiter (TTL). For more details see page 45 of http://www.smartcockpit.com/pdf/plane/bae/JETSTREAM-41/systems/0007IF APR is armed then autorelight and autofeather are also active. Relighting will be attempted automatically until a set RPM value is reached (I forget what) where upon the autofeather will operate. Please note if APR is not operational it is necessary to manually feather the propellers! Use of APR requires a takeoff be conducted at full power, with all IECs and TTL operational. APR will not operate below 65% torque and 99% prop rpm, regardless of wherever it is armed or not - should an engine fail during landing and you need to go around, pushing the levers beyond 65% torque will activate APR. APR can only be used for a maximum of 10 minutes... unless you want serious problems with your remaining working engine! To reinforce the point, if the APR system is activated, it adds 300 hours to the engine run time and is logged by the IECs.There is also the NTS (Negative Torque Sensing) system, which in the event of an engine flameout senses that the propeller is windmilling (i.e. turning the engine, rather than vice-versa) and will reduce hydraulic pressure in the propeller hub, allowing the propellers to move to a higher blade pitch and hence reduce drag. This system is permanently active. Even with NTS operation, it is still necessary to perform a manual feathering drill, as the propellers will begin to unfeather after a short period (when the windmilling engine begins turning the propeller again). The system is entirely mechanical and based around oil pressure. http://www.smartcockpit.com/pdf/plane/bae/JETSTREAM-41/systems/0007/ it's discussed there on pages 8, 9 and 36 if you are interested.Chris (廖傑英)

Thanks very much Chris ! Hallo :(

As a) and B9 have been answered, I'll only refer to the last 2 points..Anti-Ice Systems are Prop Anti Ice: manually activated on the OHP. Short cycle for temperatures above -5°C, below use the long cycle.Engine & Elevator Anti-Ice: as well manually activated on the OHP. Engine anti ice provides hot bleed air in the intake area, which doesn't allow ice to form up but also increases the EGT due to the higher intake temperatures. With the same swich the electric heater mats on the elevator HORNS are also activated.Both systems should be activated before entering icing conditions (visible moisture such as clouds, fog etc at temperatures below 10°C), and can be deactivated when the ice warning indicator goes off. De-Ice Systems:Rubber boots on the wings, elevator and vertical stab. When some amount of ice has formed up, activate the Auto-Cycle on the OHP. The boots are now inflated in groups (not all at a time), which removes the ice from the leading edge. You should use it when some ice has formed up.. well, for this you got to have the visual icing turned on.Engine ignition: Should be set to continous when it's likely that an engine could fail. For example in heavy rain, snow, severe icing, heavy tubulences.

Thanks to you too Matthias, now it's all much clear to me :(