Boeing B737 MAX - Fire Protection

Pulling the engine fire warning switch up:

Closes the spar fuel shutoff valve. The engine fuel shutoff valve must be closed using the engine start lever.

Closes both the engine fuel shutoff valve and the spar fuel shutoff valve only if the battery switch is ON

Closes both the engine fuel shutoff valve and the spar fuel shutoff valve.

Closes the engine fuel shutoff valve. The spar fuel shutoff valve must be closed using the engine start lever.rn

Correct! Wrong!

Some of the indications for an engine fire warning are MASTER CAUTION & OVHT/DET annunciator lights, the ENG OVERHEAT light, the Master FIRE WARN lights and the red fire switch light. What are the other indications?

The Fire Bell.

The APU DET INOP light illuminates.

A Red ENG OVERHEAT light illuminates.

Correct! Wrong!

After a wheel well fire, if the landing gear must be retracted for airplane performance, leave the landing gear extended for ___ minutes after the WHEEL WELL fire warning light has extinguished.

15 minutes.

20 minutes.

10 minutes.

30 minutes.

Correct! Wrong!

Holding the TEST switch to the FAULT/ INOP position:

Will illuminate the Master Caution, OVHT/DET annunciator, FAULT, WHEEL WELL and APU DET INOP lights.

Will illuminate the Master Caution, OVHT/DET annunciator, FAULT and APU DET INOP lights.

Will illuminate the Master Caution, FAULT annunciator and APU DET INOP light.

Correct! Wrong!

Illumination of the APU DET INOP light will also cause the MASTER CAUTION and OVHT/DET annunciator lights to illuminate.

False.

True.

Correct! Wrong!

What is the power source for the Engine Overheat and Fire Detection?

NO.1 Transfer Bus (115V AC).

Hot Battery Bus (28V DC).

Battery Bus (28V DC).

Correct! Wrong!

When the Extinguisher Test switch is held in the 1 or 2 position, 3 lights illuminate indicating:

The quantities of all extinguisher bottles are being tested.

The associated bottle discharge circuits for all engine extinguisher bottles are being tested only.

The associated bottle discharge circuits for all 3 extinguisher bottles are being tested.

Correct! Wrong!

In case of Cargo Fire, the Cargo Fire (FWD / AFT) Warning Lights are illuminated red.

At least one detector in each loop detects smoke or fire condition.

Correct! Wrong!

Holding the TEST switch to the OVHT/FIRE position with AC on the busses will illuminate the:

Master FIRE WARNING lights. Master Caution lights and OVHT/DET annunciator. ENG 1, ENG 2 and APU Fire Warning lights. ENG 1 and ENG 2 OVERHEAT lights.

Master FIRE WARNING lights. Master Caution lights and OVHT/DET annunciator. ENG 1, ENG 2 and APU Fire Warning lights. ENG 1 and ENG 2 OVERHEAT lights. WHEEL WELL light.

Master FIRE WARNING lights. Master Caution lights and OVHT/DET annunciator. ENG 1, ENG 2 and APU Fire Warning lights. ENG 1 and ENG 2 OVERHEAT lights. WHEEL WELL light. APU DET INOP light

Correct! Wrong!

The engine fire switches are normally locked down to prevent inadvertent shutdown of an engine:

Illumination of an engine fire switch or ENG OVERHEAT light unlocks the engine fire switch. The switches may also be unlocked manually.

Any fire condition will unlock the engine fire switch.

Illumination of an engine fire switch unlocks the engine fire switch. The switches may also be unlocked manually.

Illumination of an engine fire switch unlocks the engine fire switch.

Correct! Wrong!

The APU horn in the main wheel well can be silenced by:

Either the Horn Cutout switch in the wheel well or the Bell Cutout switch on the fire panel (Aft Electronics Panel) in the flight deck.

Either the Horn Cutout switch in the wheel well or the APU Horn Cutout switch on the fire panel (Aft Electronics Panel) in the flight deck.

The Horn Cutout switch in the wheel well only.

Correct! Wrong!

During an OVHT/FIRE test the No 1. Fire Handle light and associated overheat light do not illuminate. What does it indicate?

There is a short circuit on one of the loops for No. 1. engine

There is an open circuit on one of the loops for No. 1 engine.

The test circuit is operating and the overheat light will illuminate after 2 seconds, followed by the Fire Handle light.

Correct! Wrong!

The system contains a fault monitoring circuit. If one loop fails with the OVHT DET switch in NORMAL, that loop must be manually deselected and the remaining loop functions as a single loop detector.

True.

False.

Correct! Wrong!

If one loop fails with the OVHT DET switch in NORMAL, that loop is automatically deselected and the remaining loop functions as a single loop detector.

If smoke / fumes are uncontrollable, the crew is supposed to descent to the lowest safe altitude and at 14000 or below, the PRESSURIZATION MODE SELECTOR should be positioned to MAN while the OUTFLOW VALVE switch should be opened. What is the main cause of the OUTFLOW VALVE operation?

To depressurize the cabin.

To provide smoke/fumes contamination of/from other compartments.

To provide maximum cabin ventilation.

This causes the cabin airflow to carry smoke/fumes aft.

Correct! Wrong!

The outflow valve can take up to 20 seconds to open.

During normal operation as a dual loop system, with the OVHT DET switch in NORMAL, an alert is initiated only if one of the detector elements in Loop A and one of the detector elements in Loop B signal an overheat or fire condition.

True.

False.

Correct! Wrong!

If the DETECTOR FAULT light is illuminated (amber), a minimum of one loop in one or both cargo compartments have failed.

False.

True.

Correct! Wrong!

BOTH loops in one or both cargo compartments have failed.

With the OVHT DET switch in the B position:

Either A or B detector loops can initiate an overheat or fire warning.

Only the B detector loop can initiate an overheat or fire warning.

Only the A detector loop can initiate an overheat or fire warning

Correct! Wrong!

All switches on the Fire Panel are in their normal positions. The TEST switch is then held in the OVHT/FIRE position and all normal test indications are observed. The FAULT light is also observed to be illuminated which would mean that:

The test circuit is operating and the fault light will extinguish after 5 seconds.

There is a open circuit on one of the loops.

There is a short circuit on one of the loops.

Correct! Wrong!

A dual fire detector loop is installed in the main wheel well

False.

True.

Correct! Wrong!

A single fire detector loop is installed in the main wheel well. As the temperature of the detector increases to a predetermined limit, the detector senses a fire condition. The WHEEL WELL fire warning remains illuminated until the temperature of the detector has decreased below the onset temperature.

APU fire protection consists of:

Please select 2 correct answers

APU fire detection and extinguishing powered by the hot battery bus.

APU fire detection and extinguishing powered by the battery bus.

APU fire detection powered by the battery bus and the APU fire extinguishing powered by the hot battery bus.

APU fire detection powered by the hot battery bus and the APU fire extinguishing powered by the battery bus.

Correct! Wrong!

The Engine Fire Extinguisher system contains:

Three freon bottles which may be discharged into both engines and the APU.

Two freon bottles which may be discharged into either engine.

Three freon bottles which may be discharged into both engines.

Correct! Wrong!

Cargo compartement smoke detection is powered by:

Transfer bus No.1

DC bus 1 and DC bus 2.

Hot battery bus.

Switch hot battery bus.

Correct! Wrong!

Cargo compartment fire extinguishing is powered by the hot battery bus.

The Engine Fire Extinguisher system contains:

Two freon bottles in the main wheel well with individual plumbing to their respective engine and the APU.

One freon bottle in each engine nacelle with plumbing to either engine and APU.

Two freon bottles in the main wheel well with their associated plumbing to both engines.

Correct! Wrong!

APU Fire Detection - As the temperature of the detector increases to a predetermined limit, the detector senses a fire condition. The APU fire switch remains illuminated until the temperature of the detector has decreased below the onset temperature.

True.

False.

Correct! Wrong!

The Engine Overheat and Fire Protection system has:

Two dual element overheat/fire detection loops installed in each engine nacelle.

Four single element overheat/fire detection loops installed in each engine nacelle.

Two overheat/fire detection loops, each consisting of four detector elements, installed in each engine nacelle.

Correct! Wrong!

Engine Overheat and Fire Detection - If the OVHT DET switch is positioned to A or B, the system operates as a single loop system. The non-selected loop is not monitored. If the selected loop fails, the FAULT light illuminates and the system is inoperative.

True.

False.

Correct! Wrong!

Main wheel well fire protection consists of fire detection powered by the:

No.1 AC Transfer bus.

Battery bus.

Switched hot battery bus.

No.2 AC Transfer bus.

Correct! Wrong!

Placing the TEST switch in the FAULT / INOP position tests:

The engine overheat detectors.

The APU DET INOP light, FAULT light and APU BOTTLE DISCHARGE.

The fault detection circuits for both engines and the APU.

The fault detection circuits for both engines

Correct! Wrong!

The APU Horn Cutout switch in the main wheel well will silence:

The fire alarm bell and the APU fire warning horn, and cause the APU fire warning light (main wheel well) to stop flashing but remain illuminated.

The APU fire warning horn only, and cause the APU fire warning light (main wheel well) to stop flashing but remain illuminated.

The fire alarm bell and the APU fire warning horn, and has no effect on the APU fire warning light (main wheel well).

Correct! Wrong!

The power source for the APU Fire Detection is the:

Hot Battery Bus (28V DC).

Battery Bus (28V DC).

NO.1 Transfer Bus (115V AC).

Correct! Wrong!

The power source for Engine Fire Extinguishing is the:

Switched Battery Bus.

Transfer Bus No.1.

Hot Battery Bus.

AC Standby Bus

Correct! Wrong!

There are two fire detection loops installed on the APU.

True.

False.

Correct! Wrong!

A single fire detection loop is installed on the APU.

Illuminated (amber) FAULT with the overheat detector switch in NORMAL it indicates both detector loops for an engine have failed. With the overheat detector switch in A or B it indicates the selected loop for an engine has failed. MASTER CAUTION and OVHT/DET system annunciator lights also illuminate.

False.

True.

Correct! Wrong!

MASTER CAUTION and OVHT/DET system annunciator lights do NOT illuminate.

Boeing 737 MAX - Fire Protection

Quiz

Boeing B737 MAX - Fire Protection

Pulling the engine fire warning switch up:

Some of the indications for an engine fire warning are MASTER CAUTION & OVHT/DET annunciator lights, the ENG OVERHEAT light, the Master FIRE WARN lights and the red fire switch light. What are the other indications?

After a wheel well fire, if the landing gear must be retracted for airplane performance, leave the landing gear extended for ___ minutes after the WHEEL WELL fire warning light has extinguished.

Holding the TEST switch to the FAULT/ INOP position:

Illumination of the APU DET INOP light will also cause the MASTER CAUTION and OVHT/DET annunciator lights to illuminate.

What is the power source for the Engine Overheat and Fire Detection?

When the Extinguisher Test switch is held in the 1 or 2 position, 3 lights illuminate indicating:

In case of Cargo Fire, the Cargo Fire (FWD / AFT) Warning Lights are illuminated red.

Holding the TEST switch to the OVHT/FIRE position with AC on the busses will illuminate the:

The engine fire switches are normally locked down to prevent inadvertent shutdown of an engine:

The APU horn in the main wheel well can be silenced by:

During an OVHT/FIRE test the No 1. Fire Handle light and associated overheat light do not illuminate. What does it indicate?

The system contains a fault monitoring circuit. If one loop fails with the OVHT DET switch in NORMAL, that loop must be manually deselected and the remaining loop functions as a single loop detector.

If smoke / fumes are uncontrollable, the crew is supposed to descent to the lowest safe altitude and at 14000 or below, the PRESSURIZATION MODE SELECTOR should be positioned to MAN while the OUTFLOW VALVE switch should be opened. What is the main cause of the OUTFLOW VALVE operation?

During normal operation as a dual loop system, with the OVHT DET switch in NORMAL, an alert is initiated only if one of the detector elements in Loop A and one of the detector elements in Loop B signal an overheat or fire condition.

If the DETECTOR FAULT light is illuminated (amber), a minimum of one loop in one or both cargo compartments have failed.

With the OVHT DET switch in the B position:

All switches on the Fire Panel are in their normal positions. The TEST switch is then held in the OVHT/FIRE position and all normal test indications are observed. The FAULT light is also observed to be illuminated which would mean that:

A dual fire detector loop is installed in the main wheel well

APU fire protection consists of:

The Engine Fire Extinguisher system contains:

Cargo compartement smoke detection is powered by:

The Engine Fire Extinguisher system contains:

APU Fire Detection - As the temperature of the detector increases to a predetermined limit, the detector senses a fire condition. The APU fire switch remains illuminated until the temperature of the detector has decreased below the onset temperature.

The Engine Overheat and Fire Protection system has:

Engine Overheat and Fire Detection - If the OVHT DET switch is positioned to A or B, the system operates as a single loop system. The non-selected loop is not monitored. If the selected loop fails, the FAULT light illuminates and the system is inoperative.

Main wheel well fire protection consists of fire detection powered by the:

Placing the TEST switch in the FAULT / INOP position tests:

The APU Horn Cutout switch in the main wheel well will silence:

The power source for the APU Fire Detection is the:

The power source for Engine Fire Extinguishing is the:

There are two fire detection loops installed on the APU.