This is an old revision of the document!
Take your time and look around the Cockpit for a bit. Read the panel names and get an idea where which panel is located. Lets start a bit of a tour through the flight deck of the Q400. Directly in front of the pilot there are two monitors. The left one is the primary flight display (PFD) and the right one is a multi function display (MFD) currently showing the navigation display page (ND) with the flight plan and waypoints on it. The bottom half of the MFD shows the positions of the Primary Flight ControlS (PFCS). In the center of the front panel we find the Engine Warning Display (EWD) that indicates the status of the engines, most interestingly to us: torque (TRQ) precentage and propeller rotation speed (PROP RPM). Directly above the EWD, in the glareshield, you can find the Flight Guidance Control Panel (FGCP) also called autopilot panel, which we will use to interact with the autopilot.
The PFD displays, left to right, the current airspeed, the attitude, the altitude and the vertical speed. In the lower half of the display you find the horizontal situation indicator (HSI). The primary flight display is the most important display in the entire cockpit. For that reason it is place directly in front of the pilot.
The PFD is split into several parts:
Note - V1 and VR will be removed from the legend as soon as they are passed in the acceleration phase. They come back after touch down when the speed is decreased again. V2 will be removed when it runs of the speed tape and will also come back during the rollout.
The solid triangle represents the flap retraction speed (V FRI). Above this speed you can safely retract your flaps after takeoff.
The triangle outline is the climb speed (V Climb). After the level off (not below 400ft above the field) you can use it as a target when the one engine has failed.
Setting MDA Marker For Takeoff
It is quite helpful to set the Minimum Descent Altitude (MDA) marker to 1500ft above the airport elevation. Then we know when to reduce the pitch attitude after the takeoff and start accelerating into the climb phase. Read the current altimeter indication on the right side of the primary flight display (PFD) and add 1500ft, maybe round it up a little bit.
To enter this altitude as MDA
The “throttle quadrant” in the Q400 moves a lot of levers into one location. From left to right the quadrant features:
In the pedestal we find the Audio and Radio Control Display Units (ARCDU 1 and2), the aileron and rudder trim, the Multi Function Display (MFD) control panel and the Weather Radar controls.
The Audio and Radio Control Display Units (ARCDU 1 and ARCDU 2) are the Q400's interface to the navigation receiver frequencies and audio levels as well as the ATC/TCAS modes and microphone settings.
Automatic Frequency Tuning (FMS Mode)
The simulated ARCDU in the Aerofly FS 2 have the capability to tune the ILS frequencies of the destination airport fully automatically. They also set the course which is not possible in the real world aircraft. Automatic tuning is only performed when the mode selector of the ARCDU is in “FMS”. The left ARCDU (ARCDU 1) can tune ILS1 and the right ARCDU (ARCDU 2) tunes ILS2 if they are set to “FMS” mode respectively.
Manual Modes (ON, BOTH)
The left ARCDU (ARCDU 1) is assigned for the left side frequencies (VHF1, VOR1/ILS1 and ADF1). The right side controls all receivers with the number 2 at the end.
ON - Only editing of the the onside frequencies is allowed
BOTH - The frequencies of the left and right side can be tuned.
Manual Frequency Tuning
Note - When FMS mode is selected or the mode selector isn't on BOTH and a frequency of the opposite side is selected with the line select buttons then the label will flash. Change the mode to BOTH on each ARCDU device to gain full authority.
Note - Similarly you can access expanded pages for VHF1/2, NAV1/2 and ADF1/2. There is also a PG 1/2 button to access page 2 of the ARCDU.
At the time this text was written no audio reception was implemented yet. So this is more in preparation for later.
There are several derates for the turboprop engines that the pilots of a Q400 can chose from. The selection is made with a movement of the PROP/condition levers and the available pushbuttons for engine control in front of the throttle quadrant. The available affect the maximum torque and therefor maximum power of the engines. We modeled all of the Q400 derates which are:
When moving the condition levers the default selections are restored. The default engine derates are mapped to the lever position like this:
Engine Rating And Noise Reduction
After moving the condition levers to the desired rotation speed the default engine derate can be overwritten with the push buttons on the engine control panel:
Reduced Takeoff Power
To save fuel, engine wear and noise emissions a takeoff with reduced takeoff power can be performed.
Reduced Propeller Rotation Speed Landing For Noise Reduction
To reduce cabin and airport noise during the approach it is common to use a reduced rotation speed of 850 RPM. To be prepared for a go-around with full power available the aircraft is prepared as follows:
Note - To cancel this state either increase power above 50% to perform a go around or push the RDC NP LDG pushbutton a second time.
The Flight Guidance Control Panel (FGCP) is the interface to the autopilot and flight director. The left column of push buttons to the left of the vertical wheel in the center are used to change the vertical modes (pitch up and down). The buttons on right column affect the lateral steering mode (bank left or right).
In the center of the panel a vertical scroll wheel can be found that is used to manipulate the selected pitch, selected indicated airspeed or selected vertical speed, which ever mode is currently selected. The direction of the scroll wheel is always in the same manner, scroll the wheel up with the finger and you find the aircraft pitching down, rotating in a similar fashion as the wheel. And if the wheel is scrolled downwards the aircraft follows that rotation and pitches up.
In the lower left and lower right corner of the panel you can find the heading knobs (HDG). These knobs are rotated with the mouse wheel to change the selected heading. Use either heading knob, they are linked together in our simulated aircraft.
Brief explanation of the purpose of each knob:
Left buttons (vertical mode):
Right buttons (lateral mode):
Basic Lateral Mode
Whenever a lateral mode is disengaged by pressing the button a second time or when the STBY button is pressed or when the FD is engaging in flight the basic lateral mode engages. When the bank angle at that time is below ~6 degrees the wings are leveled (WING LVL) followed by a heading hold (HDG HOLD) and present heading is maintained. Above that threshold the current bank angle is maintained (ROLL HOLD). Tutch Control Steering (TCS) to manipulate this bank angle is not implemented yet.
Heading Select (HDG SEL)
Vertical Speed (VS)
Indicated Airspeed Hold (IAS)
Arming Altitude Acquire (ALT SEL)
Unlike most modern airlines the Q400 engineers decided that the altitude capture function should only engage when pilots explicitly press a button to arm it. Since it is very unique for an autopilot we modeled this in the Aerofly FS 2 aircraft but this also means that you have to check if ALT SEL is armed in white on the PFD every time you changed the selected altitude. Typically a press on the ALT SEL pushbutton is required when you are maintaining the current altitude and want to climb or descent to another altitude. Then another vertical mode has to be engaged and the selected altitude has to be changed and ALT SEL needs to be pushed.
On the upside, if you ever wish to prevent a level off you can disarm the altitude capture (ALT SEL) by holding the ALT SEL button for 1 second. In the Aerofly we currently model this with a right click due to technical reasons.
When ALT SEL is armed in white on the PFD the active vertical mode will change to ALT* (altitude acquire) to capture the altitude followed by ALT to maintain that altitude.
There are four possible navigation sources in total: FMS1, NAV1, NAV2 and FMS2. The selected sources are changed with the NAV SOURCE knobs on the FGCP as well as the HSI SEL button on the same panel.
FMS1 and 2 are the flight management systems of the Q400 that contain the lateral and vertical flight plan.
NAV1 and NAV2 are navigation receivers that can be tuned to a certain frequency to receive VOR or ILS localizer signals as well as Glide Slope (GS) information and distance to the station with their distance measurement equipment (DME). Depending on the frequency NAV1 and NAV2 will be displayed as VOR1 or ILS1 and VOR2 or ILS2.
The selection of a navigation source is done individually on each of the two HSIs (left and right PFD). The flight guidance (autopilot) uses either the left or right side nav-source as indicated by the HSI SEL arrows on the autopilot panel (FGCP) as well as an arrow on the PFD not in use (pointing to the selected side).
The currently selected navigation source for the HSI is displayed on the PFD, in a small legend next to the HSI. The selected course and course deviation change depending on the nav-source. The legend is colored in magenta for “FMS” navigation sources and cyan for “NAV” navigation sources. If the pilot and copilot both select the same navigation source the color for the nav source will be yellow, e.g. to warn both sides not to change any course or frequency without communicating with the other person.
Follow VOR/ILS (VOR, LOC + GS)
Lateral Navigation With Flight Plan (LNAV)
Note - If LNAV HDG SEL is indicating on the FMA turn the heading knob towards the route to get back on track. LNAV should engage automatically when the route is close enough and can be captured.
Typically, during climb, IAS is used up to a certain altitude before switching back to PITCH HOLD. Three climb profiles can be chosen from:
After that speed is either gradually reduced by about 5kts per 1000ft or the IAS mode is deselected by pressing the IAS pushbutton again. In the following PITCH HOLD mode the pitch attitude is lowered to about 5 degrees.
During the descent either vertical speed, IAS or VNAV are used. It is also be possible to use PITCH HOLD during some phases in the descent.
For the descent the indicated airspeed mode (IAS) there are multiple descent types:
Vertical Navigation (VNAV) Descent
The vertical flight plan (VNAV) can only be used for the descent planning. The autopilot will fly a fixed geometric path towards the final approach fix and we have to manage the speed ourselves. We can reuse the speed profiles from the IAS descent (see above). Keeping the power lever a bit above FLT IDLE we can, for example, maintain around 240 kts which results in a nice and stable descent all the way into the approach without the need to reduce speed at any point in the descent.
VNAV PATH will engage once the vertical profile is intercepted. To intercept use any other vertical, e.g. vertical speed and either increment the descent rate if you are above profile or reduce sinkrate or even level off when the vertical deviation shows that the flight plan is above you.