Flight Manual: Saab 35 Draken FSX 4.1Updated: 2014-12-22

Normal operating procedures

Before starting

Starting the engine

Taxi and takeoff




Final approach and landing

Before starting

The engine control panel is connected to the hot battery bus and its warning lights will function even when the battery switch is off. If either of the fuel valves are closed and the LT warning light is still unlit, the battery is dead. Reload the aircraft in Flight Simulator to restore battery power.

  1. Switch on the main power (battery) switch. This will connect the hot battery bus to the main 29 VDC bus, which powers the starter, warning lights, fuel system, radios, internal lights, navigation lights, and some instruments.

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  2. Switch all circuit breakers ON (up). Only three of them are actually functional in the simulation, but for realism they should all be switched on.

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  3. The six warning lights shown below will be lit, and the master warning light will blink.

    If warning light HUVLÅS is lit, close the canopy (Shift-E).

    If warning light SYRGAS is lit, open the oxygen valve.

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  4. Check that the gear indicator shows 4 green lights.

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    Before startup the hydraulic pressure may be insufficient to operate the spur gear. SPORRE will then stay unlit.

  5. Open the main and afterburner fuel valves (TILL).

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    The LT warning light should now be unlit, indicating that the fuel valves for engine and afterburner are open.

    The FT warning light should be lit, indicating that the external fuel valves are closed. If no external tanks are fitted, or if the external tanks are empty, the FT light will be unlit.

  6. If external tanks are fitted, close the external fuel valves (FRÅN) before starting.

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    If the external fuel valves are open when the engine is started, external fuel will not be available after starting.

The pre-starting procedure is now complete. Proceed to Starting the engine.

Starting the engine

  1. Press and hold the starter pushbutton. Release the starter as soon as the sound of the start pump (a high whining sound) is heard.

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  2. The oil pressure and hydraulic system warning lights should go out as the engine spools up. The electrical system and fuel pump warning lights should remain lit until the AC bus is connected.

    All four gear indicator lights should now be lit.

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  3. When engine speed is stable above 30 %, push the alternator switch UPWARDS for 2 seconds to connect the AC bus.

    All warning lights on the warning lights panel as well as the master warning light should now be unlit.

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  4. If external tanks are fitted, open the external fuel valves (TILL).

    Check that the FT warning light is now unlit.

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The engine startup procedure is now completed. Proceed to Taxi and takeoff.

Taxi and takeoff

  1. Set radios and navigation systems as needed. Check that the transponder is set to ON. See also Radios.

  2. Release the parking brake and increase engine speed to about 60 %, then reduce throttle as soon as the aircraft starts moving. Use the tiller/pedals and wheel brakes to control the aircraft on the ground.

  3. When lined up on the runway, apply parking brake and center the nose wheel.

  4. Check control surface movement.

    At ground idle, large stick movements may momentarily cause a HYDII low pressure warning. This is normal.

  5. Release the parking brake and hold the aircraft using the toe brakes.  

  6. Increase throttle to 70 % and check that the engine responds. Release the toe brakes and apply full throttle. Use afterburner as needed.

  7. Check engine speed within 98–105 % and EGT within 600–750 °C.

  8. Start rotation at 250 kmh (135 kts), lift off before 320 kmh (172 kts).

  9. Retract gear before exceeding 400 kmh (215 kts).

  10. Shut off the afterburner at 500 kmh (270 kts) unless you intend to climb on afterburner (see Climb).


Climb is normally carried out on full throttle with or without afterburner. Adjust the pitch as needed to control your climb speed.

Throttle setting

Normal climb speed


Full throttle without A/B

0.9 M


Full throttle with A/B

850 kmh – 0.9 M


When climbing on afterburner, keep AOA up to avoid overspeeding.

Zoom climb

Zoom climb is carried out by accelerating to very high speed in level flight, then using the kinetic energy to climb. In this way you can achieve a much higher climb rate than is possible in a sustained climb.

  1. Make an initial climb to a suitable altitude and level off.

  2. Accelerate on full throttle + afterburner, maintaining level flight.

    Do not exceed VNE.

    Reduce throttle if EGT exceeds 770°C.

  3. Raise the nose smoothly to 30–45° attitude. The attitude angle depends on your speed: Higher Mach number = steeper attitude.

  4. Level off smoothly at the desired altitude. Avoid negative G.

    Minimum Vi at TOC = 300 kmh.


Normal cruise speed = 0.9 Mach.

Supersonic speed can be attained at all altitudes up to about 13000 m (42000 ft).

VNE (never exceed speed) is easily exceeded at low altitude.


Reduce throttle to ground idle (0% throttle, ~30% engine speed) for a standard descent. Optimal sink rate is achieved at 0.9 M – 550 kmh Vi descent speed.

Final approach and landing

Apply speed brakes and decelerate to 500 kmh at 400 m altitude. Extend gear <500 kmh, increase throttle to counter for gear drag if necessary. Watch your speed and let it bleed off gradually to 400 kmh before the final turn, 325 kmh minimum when you exit the turn.

Ideal conditions would mean a long, straight final approach at 300–350 kmh and 12° AOA with gear down and speedbrakes deployed. Engine rpm should be 80–85 % depending on fuel weight.

Keep a constant check on your speed and alpha until you are safely on the runway. Touch down at 280 kmh minimum, 320 kmh if heavy. Do NOT flare, and do NOT cut the throttle before touch down!

After TD, keep the nose up for aerodynamic braking as long as possible, then add wheel brakes. Use the drag chute if you are heavy or on a short runway.

Go around

To go around, retract speed brakes and apply full throttle, use afterburner if necessary. Retract gear as soon as the aircraft starts to accelerate.

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Be very careful when below 325 kmh airspeed at low altitude. If you pull up at this point you will reach stall conditions very quickly, with no chance of recovery. If you doubt your ability to make a safe landing – GO AROUND.