B-737 1 Step Prep (Fuel, Electric, Flight Controls) Flashcards
What happens when we put the Flight Control A switch into the Standby Rudder Position?
Stby Pump On
Open SRSOV (Standby Rudder Shutoff Valve)
Arms STBY Low Pressure Light
Position Indicating
What happens when we put the Flight Control B switch into the Standby Rudder Position?
Stby Pump On Open SRSOV (Standby Rudder Shutoff Valve) Arms STBY Low Pressure Light Position Indicating Yaw Damper (Powered by B System)
When do we use the Guarded Spoiler Switches?
We do not use those, they are for MX purposes only.
What are the 6 limitations of using the ALT. Flaps?
- Can not retract the LE Devices
- Limited to 230 Kts
- Flaps 15 landing
- Lose T.E. Flap asymmetry protection
- 15 second limitation upon releasing the switch
- 5 minute cycle limitation
When does the STANDBY HYDRAULIC amber “LOW QUANTITY” light illuminate?
Illuminates when STBY Hydraulic Reservior is below 50%. This is always armed.
When does the STANDBY HYDRAULIC amber “LOW PRESSURE” light illuminate?
Only arms when the STBY Hydraulic Pump is in operation and illuminates when the pump is exhibiting a low pressure condition.
When does the STANDBY HYDRAULIC amber “STBY RUD ON” light illuminate?
When the SRSOV is open and the FLT CONTROL (A or B) switch is in the STBY Rudder Position.
When does the amber “FEEL DIFF PRESS” light illuminate?
High differential pressure is measured by the elevator feel computer. The computer senses a large differential pressure between hydraulic system A & B.
When does the amber “SPEED TRIM FAIL” light illuminate?
If you have a Dual Channel failure of the FCC Computer system. Upon dual channel failure you will get a MASTER CAUTION and the SPEED TRIM FAIL light. If only a single channel fails you will only get a recall annunciation.
What does the SPEED TRIM system do?
Keeps us in a trimmed condition with the autopilot off
What conditions are required for the SPEED TRIM to operate?
A/S between 100 KIAS and M 0.50 10 Seconds after T/O 5 Seconds w/in release of TRIM SWITCH A/P must be disengaged Sensing of a Trim Requirement
When does the amber “MACH TRIM FAIL” light illuminate?
If you have a Dual Channel failure of the FCC Computer system. Upon dual channel failure you will get a MASTER CAUTION and the MACH TRIM FAIL light. If only a single channel fails you will only get a recall annunciation.
What does the MACH TRIM SYSTEM do?
It trims above 0.615 Mach to prevent Mach Tuck
What is the difference between SPEED TRIM and MACH TRIM?
Speed trim is a speed stability system to keep the aircraft in a trimmed condition, whereas the Mach Trim system is used to prevent Mach Tuch.
When does the amber YAW DAMPER light illuminate?
The Yaw Damper is disengaged.
What power source powers the Fuel Pumps?
AC Power
What is the power source for the Cross Feed?
DC Power
How do you begin crossfeed?
“LOW GLOW”-Make the low side tank pumps Glow by opening the crossfeed valve and then shut down the pumps on the low side (turns on low pressure lights). To stop the crossfeed, start the fuel pumps and then close the crossfeed.
Why do the center tanks burn first on the -800? -400?
On the -800 the Center Pumps have a higher output pressure.
On the -400 the Center Tanks have check valves that open at a lower pressure.
Will you get a MASTER CAUTION for a fuel pump low pressure light?
Not for a single low pressure light. You will only get a Master Caution for 2 low pressure lights in the same tank.
What happens when you pull the Fire Switch?
- Silence the Bell
- Arm Squibs
- Fuel/Spar Shutoff Closes
- Electric Generator Trips Off
- Hydraulic Shutoff Valve Closes
- Inhibits Hydraulic Low Pressure Light
- Disables Thrust Reverser
- Engine Bleed Valve Closes
What does the FILTER BYPASS amber light mean?
An impending fuel filter bypass likely due to contamination.
Should you crossfeed with a FILTER BYPASS light showing?
NO
What does an amber “BAT DISCHARGE LIGHT” mean?
Battery is experiencing an excessive discharge rate. This is commonly seen during an APU Start
What does an amber “TRU UNIT” light mean?
On the ground- Either TR1 2 or 3 experienced a fault.
In the air- Either TR 1 or a combined failure of TR 2 and 3 has failed.
What does an amber “ELEC” light mean?
There is a DC or STANDBY electrical fault
What voltage is the battery?
24 volts
What voltage is the APU generator?
28 volts
What does the MAINT switch do?
It is for maintenance only, it is used to check residual voltage with the IDG or CSD
What voltage is the engine generator?
115 Volt, 400 Cycle, three phase power
90 kVA for the -800, 45 kVA for the -400
What does an amber “DRIVE” light mean?
Generator drive malfunction occurred, specifically a Low Oil Pressure or High Oil Temperature
What does an amber “STANDBY POWER OFF” light mean?
The AC STANDBY BUS or the DC STANDBY BUS is not powered
What does a blue “GND POWER AVAILABLE” light mean?
Power is connected and power quality is good (-400 does not check power quality)
What does a blue “APU GEN OFF BUS” light mean?
APU is up to speed, available, and power quality is good
What does a blue “GEN OFF BUS” light mean?
The Generator Breaker is open
What items are powered by the engine accessory drive?
Fuel Pumps
N2 tachometer Oil Pump IDG/CSD Starter Engine Driven Hydraulic Pump
When does the amber “TRANSFER BUS OFF” light illuminate?
The respected Transfer Bus is not powered
When does the amber “SOURCE OFF” light illuminate?
Normal Source of power for the transfer bus is not powering that transfer bus
When does the CROSS BUS TIE RELAY open?
It will open at GS capture with the Autopilot and or Flight Director in use. It opens to isolate the electrical system to prevent errors from carrying from one system to another.
How long will the Battery last if all AC power is lost?
30 minutes and one APU start for the -800 (No guaranteed APU start for the -400)
What causes the APU to automatically shut down?
Fire
Battery Switch OFF (During Start)
(Any of the following Amber Lights)
Low Oil Pressure
Fault-(High Oil Temperature)
Overspeed
How long for the APU Door Inlet to open and close?
20 seconds
