Please Read This Flight Manual

Document conventions

Credits and acknowledgments

End User License Agreement (EULA)


Installing Draken

Installing in Flight Simulator X

Uninstalling Draken

First startup

Texture resolution

About the model

Interior model

Exterior model

Repaint kit

Flight dynamics

Limits and restrictions

Inverted flight


Normal operating procedures

Before starting the engine

Starting the engine

Taxi and takeoff




Final approach and landing

Emergency procedures


Hydraulic system failure

Engine fire

Superstall recovery


Cockpit layout overview

Flight data system

Backup altimeter

Backup attitude indicator

Backup airspeed indicator

AOA indicator

G-force indicator


Cabin pressure indicator

Warning and indicator lights

Warning lights panel

Master Warning Light

Gear Warning Light

Communication radios

Radio control panel ME3

Radio control panel ME1

Radio control panel ME2

PN-837/A SSR transponder

PN-79 IK transponder

Navigation systems

FLI 35 system

PN-594/A system

Manual tuning unit


Autopilot modes

Trim knobs

Override conditions

Radar and weapons

Radar system



Hydraulic system

Electrical system

Emergency Power Unit (EPU)

Fuel system


Landing gear

Stall warning system

Oxygen system

Features and special effects

Options panel




Drop tanks

Drag chute

Contrails and smoke

Chocks and covers

Pilot animations

About Saab 35 Draken



Export versions

Appendix 1: J 35J check lists

Appendix 3: FR28 Radio channels

Appendix 4: PN-594 Nav stations

Appendix 5: Technical data

Appendix 1: Cockpit glossary

Electrical panels and switches

Engine panel

Warning lights


Radar and weapons panels

Circuit breakers

Appendix 6: Prepar3D commands

Flight Manual: Bookmark J 35J Draken 5.12021-04-24

Features and special effects

Options panel




Drop tanks

Drag chute

Contrails and smoke

Chocks and covers

Pilot animations

Options panel

The first time that you load Draken in Prepar3D an Options panel will be shown. This is where you enable extra features such as the animated control stick and exterior fx. Your choices will be saved between sessions.

Click on Shift-9 to bring up the Options panel if it is not visible.

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Fig. 87 -  Options panel


The exterior engine sounds (including the start-up and shut-down sequences) are based on stereo recordings of a Volvo Flygmotor RM6B engine, a license-built Rolls-Royce Avon 200 series engine used in the 35A/B and in the A 32 Lansen. This engine is identical in sound to the RM6C used in 35J.

The interior engine sounds are a mix of synthesized sounds and the exterior sounds. Switch sounds and warning sounds are mostly synthesized but similar to the real sounds.

Sound clips used to create the sound effects are either recorded by Bookmark or in the public domain.


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The single-stage EBK-67 afterburner (reheater) adds approximately 20 kN of thrust to the 57 kN dry thrust of the RM6C (Rolls-Royce Avon 300 Mk. 60) engine.

In the real Draken the afterburner was activated by pushing the throttle to a spring-loaded stop beyond the normal maximum (MIL) position.

In this simulation the afterburner must be activated with the Concorde Afterburner/Reheater key command ( Shift-F4 ). It will not be activated by applying full throttle.

The following conditions must be fulfilled to enable the afterburner:

When the afterburner is activated you will feel a significant thrust boost, and the EBK warning light is lit for a few seconds while the exhaust nozzle eyelids open.

To cut off the afterburner, pull back momentarily on the throttle. The EBK warning light will light up again briefly while the exhaust nozzle closes.

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Fig. 89 -  EBK warning light

The EBK warning light is not an indicator for active afterburner. It only lights up when the exhaust nozzle hydraulics are operated, and on afterburner malfunction.


The canopy is opened with the Select Exit key command (default: Shift-E ). When the canopy is unlocked the canopy warning light HUVLÅS will be lit.

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Fig. 90 -  Canopy open

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Fig. 91 -  Canopy warning light

If the canopy is opened during flight it will detach from the aircraft.

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Fig. 92 -  Whoops. Here comes a Saab convertible.

Drop tanks

The J 35J was standard-equipped with two 525-liter external tanks under the fuselage, but could also be fitted with two additional tanks on the two wet outer wing pylons. Wing tanks are not available in this version. See also Fuel system.

The external tanks can be jettisoned with the Drop Tanks 1 key command (you may have to add this key command in Prepar3D). Two successive keystrokes are needed: The first will arm (unlock) the mechanism, the second will release the tanks.

In the real Draken, a toggle switch on the left side of the canopy frame is used to arm either belly or wing tanks for release, and a button (protected by a red plastic membrane) is then pushed to jettison the tanks. The arming switch is not functional in this version, but the button will trigger the Drop Tanks command.

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Fig. 93 -  Tank and canopy jettison switches

Note that a similar button is used to jettison the canopy. Not a great design choice.

Drag chute

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Fig. 94 -  Landing with drag chute

The drag chute lever and indicator are located on the throttle console. In the simulation the chute is operated with the Increase Flaps Incrementally key command (F7 ). The first click will deploy the chute, the second will drop it. Draken has no flaps, so this command is used for the chute.

In this simulation you can reset the chute by clicking on the chute indicator.

The drag chute mechanism is completely mechanical and will work without hydraulic and electrical power. The chute lever can only be operated if the throttle is below 90 %.

To prevent damage to the chute cords from the engine exhaust, the chute should be released as soon as ground speed is low enough to use wheel brakes.

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Fig. 95 -  Drag chute controls

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Chute stowed (ready for deployment)

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Chute deployed

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Chute released (dropped)

Contrails and smoke

Engine starter smoke

When the engine is started, yellow smoke from the AVPIN (isopropyl nitrate) starter motor will emanate from a valve underneath the left ram air intake.

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Fig. 96 -  Starter smoke effect

Exhaust heat

A very subtle effect of heated air emanating from the engine exhaust. It will increase with thrust and is only visible on the ground.

This effect can be enabled/disabled from the Options panel.

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Fig. 97 -  Exhaust heat

Exhaust smoke

The RR Avon/RM 6 engines normally do not produce much smoke except on startup and on full throttle. A big smoke trail indicates that fuel is not being completely burnt, usually due to residue or wear in the injection system.

This effect can be enabled/disabled from the Options panel.

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Fig. 98 -  Exhaust smoke


Wingtip contrails and wing condensation may appear with high G load, depending on temperature and relative humidity. A contrail will also appear at high altitude and/or air temperatures below -30 °C.

The high-G vapor effect can be enabled/disabled from the Options panel.

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Fig. 99 -  Condensation effects in a high-G turn

Chocks and covers

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Fig. 100 -  Details visible when parked

When the aircraft is parked and the engine is completely shut down (turbine not spinning), additional details such as the ladder, intake and exhaust covers, wheel chocks, etc. will become visible. They will disappear when the engine is started.

This effect can be enabled/disabled from the Options panel.

Pilot animations

G force effects

The upper body of the pilot moves laterally and longitudinally as G force is applied. The head of the pilot turns with rudder pedal input.

Helmet visor

The helmet visor will be raised when the oxygen valve is closed.

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Fig. 101 -  The helmet visor