Next we have to chose if we want to couple our AFCS to the waypoint or TCN, this is done by selecting either the button to the left of TCN or to the right of WYPT. You can see we have waypoint 1 selected and shown on the HSI by a small circle in front of the jet to the right, and we have the NKX TACAN tuned and shown by a small circle behind the jet. Now we’re going to the HSI page on any DDI and pressing SEQ1 at the bottom right, this will draw a broken line connecting all the waypoints of our flight plan.įirst we’re going to look the Coupled Steering modes. Now let’s explore the Coupled Steering and Roll Relief modes.įor easier visualizing I’ve loaded a basic VOR-VOR flight plan from KNKX-KLSV in the World Map for this guide. When applying pitch inputs via the control stick the AFCS will revert control back to the pilot, one the inputs stop the AFCS will set the current VVS pitch angle as the new target pitch. For example if you pitch the nose up to place the velocity vector of the HUD at 10 degrees (image 1), engage FPAH, then place the throttles to idle, as the jet slows down the AFCS will automatically pitch the nose up and attempt to maintain the velocity vector at a 10 degree pitch (image 2). This mode can only be engaged below 5000ft AGLįPAH holds the position of our last Velocity Vector (VVS) pitch angle. RALT functions identically to BALT mode by maintaining a target Radar Altitude above ground. Any significant pitch/roll input from the pilot will automatically disengage BALT and the AFCS will revert to FPAH mode. Once engaged you cannot adjust the target altitude, to complete any altitude change you must disengage BALT mode, climb/descend to the new desired altitude, then engage BALT again. Pressing BALT will automatically enter your current barometric altitude and and automatically adjust pitch to hold that altitude. Let’s start by looking at our Pitch Relief modes Engaging any Roll Relief mode will automatically engage FPAH mode unless BALT or RALT is already engaged. Engaging any Pitch Relief mode will automatically also engage the HDG mode unless ROLL, GTRK,GSEL,HSEL, or CPL mode is already engaged. With the exception of CPL mode, the left hand side is our Pitch Relief modes, and the right hand side is our Roll Relief modes. When you press the A/P button on the UFCD you’ll be presented with the following
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