B-737 1 Step Prep (Anti Ice, Hydraulic, Air System) Flashcards Preview

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Flashcards in B-737 1 Step Prep (Anti Ice, Hydraulic, Air System) Deck (29)
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1

When does the amber "OVERHEAT" window heat light illuminate?

An actual overheat condition or a loss of AC power

2

Is it normal to get two Window Heat "OFF" illuminated instead of all four?

Yes, it works like a thermostat so they might be at temperature and therefore not calling for heat.

3

What do the amber probe heat lights mean?

It means the associated probe is not receiving heat

4

What does an amber "COWL ANTI ICE" mean?

-800 A duct overpressure has occured
-400 A duct overpressure or overtemperature has occurred

5

What color light intensity for the Wing Anti Ice lights during taxi/takeoff with the WAI switch on?

Upon application of T/O thurst the Wing Anti Ice Valve will close causing a disagreement light with the switch therefore a BRIGHT Illumination. Upon takeoff WAI switch will automatically switch to OFF when weight on wheels switch senses lift off.

6

What power source powers the Wing Anti Ice Valves?

AC powered

7

What power source powers the Engine Anti Ice Valves?

DC powered

8

When does the hydraulic amber "OVERHEAT" light illuminate?

Overheat in the pump housing or the case drain. This is caused by low quantity, low fuel, or an overworked pump.

9

How much fuel must be in the main fuel tanks at all times to cool the hydraulic system?

1675 lbs at all times in the main tanks for the heat exchanger

10

When does the amber hydraulic "LOW PRESSURE" light illuminate?

There is a Low Pressure Condition for the Pump

11

How many hydraulic pumps are on the airplane?

5 pumps. 2 Engine Driven, 2 Electric, 1 Standby

12

How is the STBY HYDRAULIC PUMP activated?

1. FLT CONTROL A switch to STBY RUDDER
2. FLT CONTROL B switch to STBY RUDDER
3. ARM ALTERNATE FLAPS
4. Auto Operation

13

When is Auto Operation of the STBY HYDRAULIC PUMP normally used?

Primarily during T/O or Go Around to counter the loss of the hydraulic pressure due to engine failure.

14

What conditions activate Auto Operation of the STBY HYDRAULIC PUMP?

-Loss of System A or B, or rudder pressure reducer system fails in low pressure mode, AND
-flaps extended, AND
-Airborne, or wheel speed greater than 60 kts, AND
-FLT CONTROL switch A or B Hydraulic System ON

OR

The main PCU Force Fight Monitor (FFM) Trips

15

What system logic happens when Auto Operation of the STBY HYDRAULIC PUMP is engaged?

1. Opens the Standby Rudder Shutoff Valve
2. Activates the Standby Electric Motor-Driven Pump
3. Allows the Standby System to power the rudder and thrust reversers
4. Illuminates the STBY RUD ON, Master Caution, and 5. Flight Controls (FLT CONT) lights

16

What does the Power Transfer Unit (PTU) do?

Powers Leading Edge devices and Autoslats when we lose the B system Engine Driven pump

(Detailed Explanation: Uses system A pressure to pressurize a pump that uses B fluid to operate Leading Edge Devices and Auto Slats)

17

What does the Landing Gear Transfer Unite do?

Uses the B system to retract the landing gear due to the loss of the A system engine driven pump

18

An amber "AUTO FAIL" pressurization light illuminates for which conditions?

Outflow Valve Control Fault
Controller not responding properly

Loss of DC Power
Excessive Differential Pressure (<8.75 psi)
Excessive rate of cabin pressure change (+/- 2000 ft/min)
Controller Fault
High Cabin Altitude (above 15,800 feet)

19

When does an amber "OFF SCHED DESCENT" light illuminate?

A descent is began prior to reaching 1000 feet of the scheduled cruise altitude

20

What Cabin altitude will the Oxygen masks drop at?

14,000 feet

21

What Cabin Altitude will a "Cabin Altitude" light illuminate? (-400)

14,000 feet

22

What Cabin Altitude will the "ALT WARNING HORN" sound?

10,000 feet Cabin Altitude

23

What does an amber "BLEED TRIP OFF" light mean?

Bleed air overtemp or overpressure has occurred

24

What does an amber "WING BODY OVERHEAT" light mean?

There is a Bleed Air Leak

Left system monitors the
1. Air Conditioning Bay
2. Leading Edge Wing inboard of the engine
3. Engine Pylon
4. Keel Beam
5. APU Duct

Right System Monitors
1. Air Conditioning Bay
2. Leading Edge Wing inboard of the engine
3. Engine Pylon

25

When does the amber "PACK TRIP OFF" light illuminate?

A pack overheat occurs

26

When does the amber "DUAL BLEED" light illuminate?

There is a risk of back pressure to the APU Duct. The light monitors the position of the engine bleed switches, the isolation valve, and the APU valve

27

When does the blue "RAM DOOR FULL OPEN" light illuminate?

On the ground and inflight when the flaps are extended since the door is full open

28

How much psi for engine start?

30 psi, 0.5 psi is lost for every 1000 feet

29

When does the amber "ZONE TEMP" light illuminate?

When there is an overheat of a specific zone

-400 these are called "DUCT OVERHEAT" lights