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

Question 1

When does the amber “OVERHEAT” window heat light illuminate?

Answer 1

An actual overheat condition or a loss of AC power

Question 2

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

Answer 2

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

Question 3

What do the amber probe heat lights mean?

Answer 3

It means the associated probe is not receiving heat

Question 4

What does an amber “COWL ANTI ICE” mean?

Answer 4

• 800 A duct overpressure has occured

- 400 A duct overpressure or overtemperature has occurred

Question 5

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

Answer 5

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.

Question 6

What power source powers the Wing Anti Ice Valves?

Answer 6

AC powered

Question 7

What power source powers the Engine Anti Ice Valves?

Answer 7

DC powered

Question 8

When does the hydraulic amber “OVERHEAT” light illuminate?

Answer 8

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

Question 9

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

Answer 9

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

Question 10

When does the amber hydraulic “LOW PRESSURE” light illuminate?

Answer 10

There is a Low Pressure Condition for the Pump

Question 11

How many hydraulic pumps are on the airplane?

Answer 11

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

Question 12

How is the STBY HYDRAULIC PUMP activated?

Answer 12

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

Question 13

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

Answer 13

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

Question 14

What conditions activate Auto Operation of the STBY HYDRAULIC PUMP?

Answer 14

• 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

Question 15

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

Answer 15

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

Question 16

What does the Power Transfer Unit (PTU) do?

Answer 16

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)

Question 17

What does the Landing Gear Transfer Unite do?

Answer 17

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

Question 18

An amber “AUTO FAIL” pressurization light illuminates for which conditions?

Answer 18

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)

Question 19

When does an amber “OFF SCHED DESCENT” light illuminate?

Answer 19

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

Question 20

What Cabin altitude will the Oxygen masks drop at?

Answer 20

14,000 feet

Question 21

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

Answer 21

14,000 feet

Question 22

What Cabin Altitude will the “ALT WARNING HORN” sound?

Answer 22

10,000 feet Cabin Altitude

Question 23

What does an amber “BLEED TRIP OFF” light mean?

Answer 23

Bleed air overtemp or overpressure has occurred

Question 24

What does an amber “WING BODY OVERHEAT” light mean?

Answer 24

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

Question 25

When does the amber “PACK TRIP OFF” light illuminate?

Answer 25

A pack overheat occurs

Question 26

When does the amber “DUAL BLEED” light illuminate?

Answer 26

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

Question 27

When does the blue “RAM DOOR FULL OPEN” light illuminate?

Answer 27

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

Question 28

How much psi for engine start?

Answer 28

30 psi, 0.5 psi is lost for every 1000 feet

Question 29

When does the amber “ZONE TEMP” light illuminate?

Answer 29

When there is an overheat of a specific zone

-400 these are called “DUCT OVERHEAT” lights