What does the OXYGEN light on the CWP indicate?

That O2 system pressure is below 800 psi (+/- 35)

The O2 gauge in the cockpit indicates ____________?

Fixed bottle pressure

What is the normal charging pressure in the O2 bottle? 

1850 psi 

At what speed can the crew hatch be opened? 

160 knots max 

A reason to open the crew hatch inflight is ______? 

Smoke removal 

Which doors are connected to the warning system? 

Crew hatch, Main cabin & Cargo door 

What doors can be opened from the inside as well as the outside?

All of them. 

What supplies the pnuematic system? 

HIGH or LOW pressure bleed air, alternately. 

Pnuematic air operates which systems? 

Pressurization, air conditioning & boot de-ice 

LP bleed air is the normal source for pnuematics

True or False? 

True 

When is the only time HP bleed air is automatically supplied? 

When LP bleed air is insufficient.

(Ng is <80%)

How do you open the HP valve after is closes for an over temp when the duct cools?

HP valve to RESET, then AUTO

What does the amber L/R HP HIGH light on the overhead panel mean? 

The HP valve failed to close after being given a signal to close. 

The overhead HP HIGH light illuminates with what other light? 

AIR COND light on the CWP 

LP & HP bleed valve are electrically actuated.

True or False? 

False.

They are pnuematically operated. 

Bleed valve switch on the A/C panel placed in AUTO means _________? 

Valve automatically regulates air into the manifold as a function of altitude. 

What indicates that the bleed valve failed to close after a signal was given?

The BLD FAULT light and the AIR COND light on the CWP illuminate 

What indicates a bleed closed? 

Overhead BLD CLOSED light plus AIR COND on CWP 

BLD FAULT light may indicate:

________, ________, &_______

• The valve failed to close
• The bleed pressure was too high (illuminates, then goes out when bleed valve closes)
• The bleed air temp was too hot (illuminates and remains on, bleed valve closes)

When does the BLD FAULT light extinguish? 

When the temperature is below limits 

 The main function of the precooler? 

The precooler (RAM air heat exchanger) lowers the HP bleed air temperature. A separate flow through the precooler accomplishes LP bleed air cooling for use by pneumatic deice systems. 

If ELEC power to the LP BLD valve fails, it fails to the __________ position. 

Open

(HP valve fails closed) 

How is it possible to interconnect the two bleed systems?

Via the cross valve (X VALVE) in the manifold

The X VALVE may be opened inflight

True or False? 

False

It is only for ground operations 

What is required to open the X VALVE? 

Set these switch positions: 

What indicates a hot bleed air leak? 

Overhead BLD LEAK light illuminates, plus the amber AIR COND light on CWP 

Where is the hot air bleed air leak detection loop installed? 

Between the engine nacelles and the X VALVE 

The overhead L/R DUCT OV TEMP light means? 

The ACM compressor outlet is too hot (>225C)

or the duct temp is too hot (>82C) 

What 4 things cause the AIR COND light on the CWP to illuminate? 

Will a bleed air leak close the LP bleed valve? 

No.

(Bleeds should be closed. If BLD AIR LEAK light fails to go out, an engine shutdown may be necessary.) 

The RECIRC FAN light indicates? 

The fan is operating at <80% 

When will the RECIRC FAN light extinguish?

Once the fan speed increases over 80% 

What cools the RECIRC FAN? 

BLD AIR 

When can the RECIRC FANs operate without BLD AIR? 

During takeoff, up to acceleration altitude. 

(If the fan is left running without BLD AIR more than 10 min depending on OAT, a thermal switch will shut off the fan until the temp decreases and switch resets.) 

What is indicated by the AVIONICS VENT FAN light? 

The vent fan has failed. 

What does the CABIN PRESS light on the CWP means? 

Cabin altitude above 10,000ft or differential pressure exceeds 7.5 psi 

The avionics vent fan draws air from the _______?

Cabin

The FAULT light on the center consol cabin pressure control panel indicates?

A system failure

OR

ON for 3 seconds during system self test 

AIR COND on the CWP illuminates with any caution light except? 

L/R RECIRC FAN 

AUTO PILOT & FLIGHT DIRECTOR 

AUTO TRIM light on CWP indicates _______ ?

Autopilot detects a failure in the elevator or rudder trim systems 

Will the auto pilot operate if the Flight Director fails? 

No. 

Will the auto pilot operate if the Flight Director is turned off?

Yes. 

GO-Around displays a pitch command of ___ degrees on the ______ ?

6.4 degrees on the EADI 

When is half bank inhibited? 

In approach mode after APPR LOC/VOR capture

1/2 bank limits? 

Reduces bank from 27 to 13.5 degrees in HDG & NAV mode 

Which modes on the MSP should not be selected in icing conditions?

VS & Climb.

Use only IAS when climbing in icing conditions. 

What turns the AP off? 

What turns the Yaw Damper off? 

A flashing red box with the letters FD on the EFIS means? 

A failure of the flight director.

(V bars also disappear) 

Auto pilot limitations? 

A/P Not Authorized:

What will automatically disengage the A/P? 

Stall warning computer or AP/YD failure detected 

ELECTRICAL SYSTEM 

What are the 4 separate parts of the ELEC system? 

The AC Wild 115v generatros are used for ______ . 

Powering Ice Protection systems 

What drives each respective AC Wild generator? 

They are driven by the prop gearbox. 

How are the DC generators cooled? 

Via a fan on the ground and ram air when airborne 

An overhead GEN OV TEMP light means? 

The associated generator has overheated (150°C) 

What is indicated by the illumination of the L/R MAIN BUS light? 

The associated MAIN BUS is not powered. 

What AC power is lost when the L MAIN BUS is not powered? 

Loss of the #1 or main 115/26v INVERTER 

(Rt bus powers #2 inverter) 

When does the L/R main bus light illuminate? 

What is indicated by the L/R GEN light? 

The GEN relay is open.

The GEN is disconnected from the GEN BUS and is offline. 

 

The 2 starter generators are rated at ____ volts each. 

28v DC 

How many alternators are on each engine? 

One.

Provides engine electrical power only. 

(ESS) 

How many generators are on each engine? 

Two.

Starter/generator and AC wild generator. 

What are the functions of the GCU? 

How does the GCU control & protect the DC system? 

If generator parameters are not correct OR if the fire handle is pulled, the GCU cuts out the generator by opening the relay which disconnects the generator from the associated GEN BUS.

The starter generators are rated at  ___ amps each. 

400 

What are the starter generator amp limits? 

600 amps for 5 minutes, then 400 amps 

How is the GEN field relay reset?

The respective switch is set to RESET 

To connect a generator to the GEN BUS, Ng must be above ____ ? 

55% Ng

(Starter cut out) 

What is indicated by the illumination of the L/R ESS BUS light? 

The associated bus is not powered. 

What is indicated by the illumination of the L/R BAT light?

The associated BAT relay is open 

 

What is indicated by the illumination of the L/R BAT lights?

The associated BAT relays are open

(Battery disconnected) 

What is indicated by the illumination of the BAT HOT light?

The associated BAT temp is excessive.

(>71°C) 

Takeoff is prohibited with the BAT HOT light on.

True or False? 

True. 

Takeoff is prohibited when the BAT temp is 67°C and the BAT HOT light is not on.

True or False?

True.

Takeoff is prohibited when BAT temp exceeds 64°C 

What is indicated by the NO BAT START light? 

L or R BAT temp exceeds 57°C 

Takeoff is prohibited with a NO BAT START light.

True or False? 

False.

(Unless the BAT temp exceeds 64°C) 

A BAT temp of >71°C automatically disconnects the battery.

True or False? 

True 

To read external power, the EXT PWR switch must be ON.

True or False? 

False.

Voltage should be checked via the volt meter before it is aplied to the aircraft 

The blue EXT PWR AVAIL light indicates?

External power is available 

(At least 7v for light to illuminate) 

White EXT PWR ON light indicates?

Ext power is ON and the left battery bus is powered.

(When EXT OWR is applied, it is the only source of power to the aircraft.) 

EMER PWR light on the DC elec panel indicates? 

The EMERG PWR bus is unpowered

OR

Lead acid BAT emergency power <24v 

 

Can the 71°C (BAT HOT) thermal switch be overriden?

Yes.

In an emergency, the BAT switch can be placed to OVRD which assures power to GEN bus. 

INVERTER light on the overhead AC panel indicates? 

The selected inverter has failed 

OR

The switch is in the OFF position 

L/R AC GEN light on the overhead AC elec panel indicates? 

The associated AC GEN has failed or dropped off line 

Will the CWP ELEC light come on with a L/R AC GEN light? 

No.

The CWP ICE PROT light will illuminate 

How many 24v batteries are on the Saab 340? 

Three:

• One lead acid
• Two NiCad    

Does the BAT automatically disconnect with a BAT hot light? 

Yes. 

What does the illumination of the green BUS TIE light mean? 

The relay joining the left and right GEN buses is closed

What are the 3 reasons the BUS TIE closes? 

What is the purpose of the BUS TIE over current relay protection? 

Protects the main distribution system in case of a short in the system

The BUS TIE relay opens if the over-current exceeds _______ ?

800 amps 

Is there any time the 800 amp over current relay can be exceeded? 

Yes.

During engine start 

 Generators automatically disconnect when EXT PWR is applied.

 True or False? 

True.

What 5 things can be powered by the EMERG BAT? 

During preflight, all the exterior lights may be checked using BAT power.

True or False? 

False.

Only the L fwd nav, R rear nav & beacon function in BAT power.

What is required to close the Utility Bus relay? 

At least two generators online 

OR

External power 

 

Is EXT PWR connected to the R GEN bus via the BUS TIE relay? 

Yes 

How is the battery compartment ventilated? 

Via a fan on the ground and RAM air inflight 

Will external power de-energize the BAT relays? 

Yes

(unless the BAT switches are in OVRD, a maintenance only function to charge them)

When a GEN relay closes, which bus is powered? 

The associated GEN bus. 

Three conditions for a GEN relay to close? 

Below  ___ volts, EXT PWR drops offline and the switch spring loads to OFF. 

Approx 10 volts 

What is the lowest EXT PWR voltage during engine start? 

Approx 7 volts 

During engine start, if EXT PWR drops off line will the start continue? 

Yes, it will continue on batteries. 

The L BAT is connected to the  ____ bus. 

The START BUS 

What bus charges the batteries? 

Its respective GEN BUS with at east 1 GEN online. 

The R BAT is connected to the _____ bus. 

The R GEN BUS 

 

When does the EMERG BAT begin to power the EMERG BUS? 

When the L BAT BUS drops below 24 volts 

What powers the EMERG Avionics Bus? 

The EMERG BUS

(Powered via the L BAT BUS when the ESS AVION switch is ON. Otherwise it will seek power via the led acid battery) 

What items are powered by the EMER AVIONICS BUS? 

VHF / COM 1

&

standby horizon 

Min prop rpm to keep the AC Wild

generator online? 

About 1,000 rpm 

On taxi out, why would you see an AC gen light on? 

Prop rpm dips below 1,000 rpm  

Why is it a "Wild" frequency AC system? 

Frequency varies

460 - 640 Hz due to prop rpm variations 

How do you reset an AC gen if prop rpm drops below 1,000 and gen drops offline? 

Resets are automatic when rpm increases to 1,000 

 

What 6 items are powered by the AC Wild GEN busses  

(Yes, you need a prop turning at 1,000 rpm to keep the coffee hot even with the hot jug warmer switch "ON"!)

Is the ENG intake anti-ice powered by the AC Wild GEN bus? 

No. 

It gets its power directly off its respective AC Wild GEN.

 

(That is why during a AC GEN failure, intake heat cannot be powered by the opposite side.) 

What 3 conditions must be met for a battery relay to close? 

What is an indication of a malfuntioning GEN? 

When a GEN OV TEMP light comes on, doesthe gen automatically disconnect?

No

The affected GEN must be manually taken offline.

(Look for BUS TIE relay closure) 

FIRE PROTECTION

AVIONIC SMOKE on the CWP indicates?

Smoke has been detected in the Avionics Bay 

How long will the Avionic (or Cargo or Lav) somke light stay on? 

As long as the smoke condition exists

How long will the L/R ENG FIRE  light remain illuminated?

As long as the fire exists 

L/R FIRE DET FAIL light on the CWP indicates? 

A short circuit is detecetd in the fire loop on the related engine.

Light will remaim illuminated for as long as the condition exists. 

 

Actions required to discharge either engine fire bottle? 

Overhead white CARGO EXTG light indicates? 

Low pressure is detected in the respective bottle 

What kind of fire protection is available for the avionics rack?

A halon fire extinguisher in the cockpit

(Discharge into the Avionic rack port behind Captain) 

What kind of fire protection is available in the lav? 

 An automatically discharged halon fire extinguisher in the trash bin.

(Halon discharged via a heat sensitive blow out plug)  

What is the MIN time between firing CARGO FIRE EXTG #1 & #2? 

2 minutes 

(To prevent excessive pressure buildup within the compartment and risk blow out panel rupture, leaking halon into the cabin)

What is the normal wait time before firing CARGO FIRE EXTG #2?

25 minutes 

Discharge of the 2nd bottle within 25 minutes of the first increases fire suppresion time limit to 60 minutes over 40 minutes from bottle #1 alone 

When a cargo fire extinguiisher is activated, will the CARGO EXTG light come on right away?

If the bottle is functioning normally, it should not.

It can take 15 minutes for the while EXTG light to illuminate 

What happens when the fire handle is pulled?

(6) 

 

Can the R engine fire bottle be discharged into the L engine nacelle? 

Yes

 Bottles are connected via a manifold to allow selective discharge to either engine.

FUEL SYSTEM

How many fuel pumps are on the Saab 340 and how are they powered?

Four:

• Two engine driven driven main pumps

• Two elec driven standby pumps 

What controls the elec standby pumps? 

Overhead switches

&

Automatic switches in the CLs 

How many ways can fuel quanitity be checked? 

Three:

What elec bus powers the refueling panel? 

Hot Battery Bus

What is indicated by the illumination of the L/R STBY PRESS light?

Pump senses positive pressure is sensed in the fuel line.

 (Directly or via crossfeed)

What is indicated by the illumination of the L/R MAIN PRESS light?

 

The associated main pump is pressure differential is low

(<6 psid) 

What happens is a main pump fails or has low pressure? 

The associated STBY pump is acutuated

(Providing the switch is in the normal

AUTO position) 

What supplies fuel to the engine during start? 

The Standby Pump 

During engine shutdown when the main pump pressure drops, a CL actuated switch will inhibit the standby pump auto starting feature.

True or False? 

True 

What is indicated by the blue fueling light? 

• The fueling/defueling panel is powered

• The fueling/defueling valve is open 

Fuel gauges are calibrated to show actual fuel remaining.

True or False? 

False

They show useable fuel remaining. 

What is indicated by the L/R FUEL FILTER light? 

Fuel filter blockage

Bypass impending 

"X FEED ON" indicates switch position or valve position? 

Valve posiiton 

"CONN VLV OPEN" indicates switch position or valve position?

Valve position 

How to do test a STBY fuel pump? 

By moving a CL to the start position

(The associated green light should illuminate) 

The L/R VALVE closed light indicates? 

The associated fuel valve is closed. 

How many ways can you close a

Fuel Shutoff Valve? 

One.

(Shut off valves in the wing prior to the engine nacelle are powered by their respective BAT bus when the fire handle is pulled.) 

L/R LOW LEVEL light on the Fuel Panel indicates? 

The associated tank is below 300 lbs (+/- 70lb) 

What lights on the overhead fuel panel do not cause an amber FUEL light on the CWP?

• FEED ON
• CONN VLV OPEN
• L/R STBY PRESS

What is the useable fuel quantity? 

5,690 lbs 

Where are the STBY fuel pumps located? 

Inside each respective wing tank hopper.

The fuel vent also serves as an overflow.

True or False? 

True 

Can one STBY pump supply enough fuel to operate both engines? 

Yes. 

How is fuel transferred between wings? 

By gravity via the interconnect line.

Does the green STBY PRESS light indicate the respective pump is on? 

No

Only that positive pressure is sensed at the pump inlet. 

HYDRAULICS

What causes the CWP HYDR light to illuminate?

Main reservior is too hot (>116°C)

OR

Main or Emergency accumulator pressure is low 

(<1,850 psi) 

 

Why might the hyd fluid get too hot and trigger the CWP HYDR light? 

Continuous pump operation 

What aircraft systems use hydraulic power? 

The HYDR pump is electircally driven.

True or False? 

True

L Main bus in AUTO and L BAT Bus* in OVRD

(*on later modified a/c)    

What systems can be operated with the

emergency HYD hand pump? 

What triggers activation of the main HYD pump? 

How many HYD accumulators are there? 

4

(Main, EMERG, inboard brakes, outboard brakes) 

What pressure is displayed on the accumulators in the nose wheel well?

The sum of the nitrogen precharge pressure plus  pressure developed by the HYD pump (if any). 

Which HYD accumulators have check valves? 

EMERG, inboard brake & outboard brake 

(All but the main as it supplies gear, flaps, brakes, steering)

How does EMERG landing gear extension use hydraulics?

HYD pressure disengages the uplocks, allowing the gear to free fall into position. 

What bus supplies power to the HYD pump in AUTO? 

L MAIN  BUS 

Is there a circuit breaker for the HYD pump? 

No

(It is protected by a 200 amp fuse in the

L Power Distribution Unit) 

The main HYD reservoir is pressurized by ____ ?

An internal spring backed up by emergency uplock accumulator pressure (to 35 psi in the reservior).

The HYDR light on the CWP indicates low fluid quantity. 

 

True or False? 

False. 

(Only low main or emerg acc pressure or high temp) 

Can the main hyd accumulator be pressurized by the hand pump? 

Yes 

Can the emerg hyd accumulator be pressurized by the hand pump?

No 

Can the flaps be extended and retracted by the hand pump?

Yes 

Hydraulics are pressurized up to _____ on OVRD. 

3,000 psi 

What systems are supplied with HYD pressure from the emergency accumulator? 

Landing gear uplock release

&

Main reservior pressure to assist spring

Fluid pumped with the hand pump returns to the main reservoir

True or False? 

True 

ICE & RAIN PROTECTION

What ice protection systems use BLD air?

What is powered automatically when the first AC GEN comes online? 

What is indicated by the DE ICE OV TEMP light on the overhead Ice Protection panel? 

Bleed air to the boots is too hot

(>150°C) 

What is indicated by the TIMER light on the overhead ice protection panel? 

A pressure problem or a timer malfunction 

If the TIMER light is on, how do you test to see if it resulted from a timer malfunction? 

The TIMER light will extinguish if the

W OUTBD button is pushed and illuminates again when released.

What is the order of boot inflation when one cycle is selected? 

Stabilizer, outboard wing, inboard wing, stabilizer 

How is boot inflation monitored? 

Via the green indicator lights on the overhhead

ice protection panel

(When the BOOT IND switch is on) 

In CONT mode, inflation boot cycles repeat every ___________ .

Every third minute 

Will the boots inflate if LP & HP bleed valves are closed?

Yes

Regulated, temperate air is sent directly to the boot distribution duct via a valve in each engine nacelle. 

What does the L/R AIR VALVE light indicate? 

 The associated AIR VALVE is not properly positioned in accordance with the switch selection.

What ice protection systems have a light on the flight status panel? 

Engine Anti-Ice

&

Prop De-Ice 

What is indicated by the illumination of the L/R AC GEN light? 

The associated AC GEN has dropped offline 

The R AC GEN can power the L intake heat.

True or False? 

False

Intake heat is the only thing that cannot be powered by the opposite side AC GEN. 

The blue PROP DE-ICE light on the flight status panel will go out in case

of a system failure. 

 

True or False? 

True 

What is the time cycle for the props in NORM? 

ON for 11 seconds, OFF for 79 seconds

What is the time cycle for the props in MAX?

ON for 90 seconds, then OFF for 90 seconds 

The blue L/R ENG ANTI-ICE light on the flight status panel will go out in case of a system failure.

True or false? 

False.

(Indicative of switch position.) 

What is the only item on the ice protection panel that is not powered by the AC wild system? 

The STBY PITOT heat 

(24V) 

How long must the STBY PITOT heat be on to reach full operating temperature?

5 minutes 

How long must the window heat be on to reach full operating temperature?

6 minutes 

How many phases of the 115v AC wild GEN output are required to power the pitot, alpha & OAT? 

One 

How many phases of the 115v AC wild GEN output are required to power the windshield heat?

Two 

How many phases of the 115v AC wild GEN output are required to power the prop heat?

All three phases

 

What is indicated by the illumination of the L/R INTAKE light?

A failure has occured in the engine duct heating system.  

 

(An intermittent INTAKE light may indicate operation in under heat or over heat condition) 

LANDING GEAR

EMERG gear extension is by free fall or use of hand pump.

 True or False? 

True 

What does the anti-skid need to function? 

Anti-Skid switch ON, LDG gear handle down plus

power levers below flight idle

OR 

wheel speed in excess of 50 knots 

What is the touchdown brake protection feature?

Prevents brake application until 3 seconds after main gear compression

 OR

Wheel speed exceeds 50 knots 

Anti-Skid system cuts out at approximately ___ kts. 

20 knots 

A-SKID INOP light on CWP indicates? 

A system fault

OR  

Gear is down with anti-skid switch OFF 

Which CWP light comes on if the gear is not down below 500ft RA?

CONFIG 

PARK BRK ON light on the CWP indicates? 

Brake handle is pulled with a psi of >1700 

 

Is it possible to set the brake without the CWP light coming on? 

Yes

(Brake will set with 1500 psi but light will not illuminate until 1700 psi)

Where is the Anti-Skid switch located? 

On the HYD panel, center console 

EMERG gear extension & nose wheel steering are powered by what bus? 

L & R BAT bus 

Nose wheel steering is ______ actuated

and ________ operated.

Electrically, Hydraulically 

Which CWP light comes on with > flaps  15° and gear not down?

CONFIG 

What happens when you pull the EMERG LDG GEAR handle? 

MISC

What is powered by the EES?

The EES powers "DINg"

What is powered by the DECU? 

Where does the EES get its power? 

Engine driven alternator on the prop gearbox. 

What are the 3 ways to feather the propellers? 

 

What are the 4 levels of prop

overspeed protection? 

What are the indications of a failed DECU? 

In order to operate the APR function, what other systems must be functioning? 

Autocoarsen and CTOT 

What are the 4 fucntions of the HMU? 

When are you in bottom governing range? 

What is the constant speed governor range? 

1150-1396 PRPM 

Why can't the prop be moved to unfeather when the prop oil is below 25°C? 

Because the bottom governor won't engage unless the seal in the HMU has been warmed. Prop oil heats fuel, fuel warms the seal on the torque motor servo piston and it expands. During the time the seal is leaking fuel, the bottom governor will not engage.

What happens if you lose the oil pressure in the prop control unit? 

You get a fixed pitch prop 

 What are the 6 amber lights on the overhead that are not associated with the CWP?

What indications will you see if the FI stop knob is inadvertantly pulled during flight? 

Both the amber & blue FI stop lights on the flight status panel will illuminate. 

What causes the cabin emergency lighting system to illuminate? 

A loss of power to the R main bus 

Using a HP on the ground for cabin cool down is prohibited between ____ and ____ degrees  

0°C - 15°C 

What voltage will kick off the GPU? 

<10v or >31v 

Maximum time for starter engagement?    

Max Continuous power limitations? 

940°C ITT

Max ITT for engine start? 

965°C 

Limitations for takeoff power with APR? 

940°C ITT (for 5 minutes)

OR 

 950°C ITT (for 2 minutes) 

Takeoff power limitations? 

917°C (for 5 minutes)

OR 

 927°C (for 2 minutes) 

What is rough air penetration speed for the Saab? 

Va= 190kts up to FL210

Va= Vmo - 30kts above FL210

Max airspeed for flaps 7° or 15°? 

175 knots 

Max airspeed for flaps 20°?

165 knots 

Max airspeed for flaps 35°?

140 knots 

MTOW? 

29,000 lbs 

Max Ramp Weight? 

29,300 lbs 

MLW? 

28,500 lbs 

MZFW? 

26,500 lbs

On takeoff or landing an pitch of _____ degrees will cause a tail strike. 

13 degrees 

Max operating altitude?