Secondary Engine Indications - Secondary engine indications are displayed when CDS initially receives power • when selected by the Multi-Function Display (MFD) but also when:
Ignition is normally OFF. Both igniters are activated when engine start lever is in IDLE and:
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737NG-Electrical-Question-03.jpg)
The EEC drives all engine indications except:
Once activated, the DC operated fuel pump operates automatically until:
Auto-relight is provided for flameout protection, with the EEC activating both igniters. Which of the following situations would cause Flameout Protection to operate?
Inflight Starting - If crossbleed starting is required, the X–BLD indication (XB for the compact engine display) is displayed above the N2 dial. This indication is based on:
If the ENGINE CONTROL Light is illuminated (amber), engine control system is degraded due to faults in system but it is still dispatchable.
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737NG-Electrical-Engine-Control.png)
The DUAL BLEED light illuminates whenever the APU bleed air valve is open and the position of the engine bleed air switches and isolation valve would permit possible backpressure of the APU. Therefore, thrust must be limited to idle with the DUAL BLEED light illuminated.
The Starter Cutout speed is:
The EGT display, both box & dial, turn red and the EEC automatically turns off ignition and shut off fuel to the engine if:
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During an engine start , when the engine start lever is positioned to IDLE detent,the SPAR VALVE CLOSED light transitions from dim, to bright and then extinguishes.
EEC alternate mode thrust is always equal to or greater than normal mode thrust for the same thrust lever position.
CONT – Provides ignition to selected igniters when engine is operating and engine start lever is in IDLE.
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737NG-Electrical-Question-03.jpg)
FLT = provides ignition to both igniters when engine start lever is in IDLE.
Electronic Engine Control (EEC) Switches - Both ON and ALTN may be in view if EEC has automatically switched to soft alternate mode.
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737NG-Engine-EEC-ALTN.png)
Each engine has two igniter plugs. The EEC arms the igniter plug(s) selected by the ignition select switch. The Left igniter plug receives power from the DC Standby bus while the Right igniter plug receives power from the AC standby bus.
The Left igniter receives power from the associated transfer bus.
If a wet start is detected, the EEC will automatically turn off ignition & shut off fuel to the engine:
A wet start occurs if the EGT does not rise after the start lever is moved to IDLE.
Reverse thrust lever is blocked at reverse idle position until related thrust reverser is more than _____ deployed.
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737NG-Engine-Reverser2.jpg)
Engine Fail (ENG FAIL) Alert is displayed amber when:
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737NG-Engine-ENG-FAIL-Light.jpg)
What are the indications that the engine starter has disengaged?
If the Electronic Engine Control (EEC) switch as a white ON in view, this means that:
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737NG-Engine-EEC.png)
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The EEC is not powered until the engine accelerates to a speed greater than _____.
During a normal engine start:
The EEC provides redline overspeed protection for:
Thrust Reverser - When the standby system is used, the affected thrust reverser deploys and retracts at a normal rate, but some thrust asymmetry can be anticipated.
When the standby system is used, the affected thrust reverser deploys and retracts at a slower rate and some thrust asymmetry can be anticipated.
The ENGINE CONTROL Light is illuminated (amber). Light operates when:
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737NG-Electrical-Engine-Control.png)
If the reverser light is Illuminated (amber), one or more of following has occurred:
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737NG-Electrical-Reverser-Light.png)
The EEC provides N1 and N2 redline overspeed protection in both normal and alternate modes. The EGT limit must be observed by the crew because the EEC does not provide EGT redline exceedance protection.
Movement of reverse thrust lever into reverse thrust engages locking pawl preventing forward thrust lever from moving. Terminating reverse thrust removes locking pawl and restores forward thrust lever movement ability.
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737NG-Engine-Reverser2.jpg)
Electronic Engine Control (EEC) Switches - When ALTN is in view (amber), what does it mean?
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737NG-Engine-ALTN-1.png)
The amber DUAL BLEED light is illuminated before starting engines. What should the flight crew do?
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The full rated takeoff thrust for the installed engine is available at a thrust lever position equals to the forward stop.
The full rated takeoff thrust for the installed engine is available at a thrust lever position less than the forward stop.
Any time the REVERSER light illuminates for more than _____, a malfunction has occured and the MASTER CAUTION and ENG system annunciator lights illuminate.
Oil Pressure (OIL PRESS) Readout displays engine oil pressure in psi. It is displayed amber when the operating limit is reached.
It is displayed amber to show a caution range. It is displayed red when the operating limit is reached.
The EEC must receive electrical power to supply engine operating data to the flight deck engine indications. When the EEC is not powered, N1, N2, oil quantity and engine vibration are displayed directly from the engine sensors.
Thrust reverser - A pause of approximately _____ engages the electro-mechanical lock and prevents the thrust reverser sleeves from further movement. Cycling the thrust reversers may clear the fault and restore normal operation.
Approach idle is maintained:
If blinking, the START VALVE OPEN alert indicates:
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737NG-Engine-Start-Valve-Open-Light.png)
Electronic Engine Control (EEC) Switches - When ON is not in view, this means that the EEC has been autmotically switched to the alternate mode.
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737NG-Engine-EEC-BLK.png)
When ON is not in view, this means that the EEC has been manually selected to the alternate mode.
Idle Operation - The EEC automatically selects ground minimum idle, flight minimum idle, and approach idle. In flight, if a fault prevents the EEC from receiving flap or anti–ice signals, approach idle schedule begins:
Which hydraulic system normally powers the thrust reversers?
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The thrust reverser can be deployed when:
Movement of the reverse thrust levers is mechanically restricted until the forward thrust levers are in the idle position.
During battery start, when does the EEC become energized?
An auto-relight capability is provided for flame-out protection. Whenever the EEC detects an engine flameout, both igiters are activated. A flameout is detected when:
At low N2 values, the oil scavenge pump may not provide enough pressure to return oil to the tank, causing a low quantity indication. Normal oil quantity should be indicated after start.
Each engine has two igniter plugs. The EEC arms the igniter plug(s) selected by the ignition select switch. The left igniter plug receives power from the associated AC transfer bus. The right igniter plug receives power from the AC standby bus.
Engine Start Levers - IDLE position
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737-Pylon.png)
If an impending hot start is detected by _____, the white box surrounding the EGT digital readout flashes white.
Engine oil pressure is in the yellow band at idle power. Which of the following is true?
The airborne vibration monitoring (AVM) system monitors engine vibration levels. Its primary function is the display of low and high pressure rotor synchronous vibration on the secondary engine display. The AVM is also used to balance the low pressure rotor. Balancing reduces high vibration indication or audible noise and tactile vibration.
EEC Alternate Mode - Loss of either DEU results in a loss of signal to either a single or both EECs. The EEC ALTN lights illuminate and each EEC reverts to the alternate mode to prevent the engines from operating on a single source of data.
Loss of either DEU results in a loss of signal to either a single or both EECs.
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Inflight Starting - If only the EGT redline is shown, this is the inflight start EGT limit. If both the EGT redline and the EGT start limit redline are shown, the start limit redline is the inflight start EGT limit for all engine starts.
Primary and secondary engine indications are displayed in compact format on the upper DU when the secondary engine indications are selected for display (manually or automatically) and the lower DU is unavailable.
During battery start with no power on the airplane, only N1 and oil quantity are available.
During battery start with no power on the airplane, only N1, N2, and oil quantity are available.
If the Exhaust Gas Temperature (EGT) readout is white-blinking Displayed EEC senses conditions that may lead to hot start or stall during ground starting.
When the engine Start Levers are placed in the CUTOFF position:
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737-Pylon.png)
The REVERSER light, located on the aft overhead panel, illuminates when the thrust reverser is commanded to stow and extinguishes 10 seconds later when the isolation valve closes.
Following shutdown of both engines, the EGT box turns amber to remind the crew of the exceedance.
Following shutdown of both engines, the EGT box turns red to remind the crew of the exceedance.
An oil quantity indication as low as zero is normal if windmilling N2 RPM is below approximately 8%.
Thrust reverser - Any time the REVERSER light illuminates for more than approximately _____, a malfunction has occurred and the MASTER CAUTION and ENG system annunciator lights illuminate.
Thrust reverser - A pause in movement of the reverse thrust levers past detent No. 1 toward the stow position may cause MASTER CAUTION and ENG system annunciator lights to illuminate.
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OIL FILTER BYPASS Alert - Blinking is inhibited:
![](https://www.smartcockpit.com/wp-content/uploads/2024/03/B737NG-Engine-OIl-Filter-Bypass-Light.png)
During periods when blinking is inhibited, alerts illuminate steady.
EEC Alternate Mode - The EEC can operate in either of two alternate modes, soft or hard. If required signals are not available to operate in the normal mode, the EEC automatically changes to the soft alternate mode. The soft alternate mode remains until the hard alternate mode is entered by:
The EEC automatically selects ground minimum idle, flight minimum idle and approach idle. Approach idle is selected in flight:
This higher % RPM improves engine acceleration time in the event of a go-around.