United 737 Engines/APU Flashcards
When must engine Ignition Be On?
- Takeoff and Landing
2. Engine Anti-Ice Operation and Heavy Rain
Max allowable EGT for Engine Start?
725 degrees
An Amber Arc on an Engine Limit Display Indicates?
Cautionary Range
On the 737-800 what is the max altitude that the APU can supply bleed air alone up to?
17,000’
On the 737-800 what is the max altitude that the APU can supply electrical power and bleed air up to?
10,000’
What is the max altitude that the APU can supply electrical power ALONE up to?
41,000’
With the EEC in Normal Mode, if the thrust lever is advanced to the forward stop what will the EEC do?
Limit Thrust to the max certified thrust rating for current conditions
On the engine panel on the after overhead panel, when will both ON and ALTN be in view?
The EEC has automatically changed to the soft alternate mode.
Thrust rating shortfalls and exceedences ____ occur as flight conditions change, when the EEC is in soft alternate mode.
CAN- remember snapshot!
In what mode does the EEC provide N1 and N2 redline overspeed protection in?
Normal mode & Alternate Mode
Which air source may the engines be started with?
APU
Ground Source
Engine Crossbleed
What do the EECs monitor to detect during ground starts?
Impending hot starts and EGS start limit exceedances
Wet Starts
Flashing White box surrounding EGT during start indicates?
Impending hot start
When the Engine Start switch is placed in the GRD position what occurs?
Starter Valve Opens, Engine Bleed Air Valve Closes Selected Igniter(s( are energized when the engine start lever is placed to IDLE.
When the Engine Start Switch is placed to CONT Position what occurs?
Ignition is provided to the SELECTED igniters when the engine is operating, and engine start lever is in IDLE
When the Engine Start Switch is in FLT position, what occurs?
Ignition is provided to BOTH the igniters when engine is operating and engine start lever is in IDLE.
IGN L, is powered by AC transfer bus #1 for engine #1 and AC transfer Bus #2 for engine #2. What is IGN R powered by for either engine?
AC standby Bus
____ occurs when the EEC detects an engine flameout
Both engine igniters are activated
The Thrust Reversers can be deployed when____ or when either radio altimeter sense less than 10 feet RA
The Air/Ground safety sensor is in the ground mode
What does an amber REV displayed above the N1 gages on the center instument panel indicate?
The thrust reversers is moved from stowed position
What does a green REV displayed above the N1 gages on the center instrument panel indicate?
The thrust reverser is deployed
___ thrust lever position will provide maximum reverse thrust.
Pulling beyond detent No.2
APU; what happens when moving the battery switch to OFF, on the ground or in flight?
Ground & Inflight; Causes an automatic shutdown of the APU
If the APU does not reach the proper speed with the proper acceleration rate within the time limit of the starter, what happens?
The start cycle automatically terminates.
Moving the APU switch to the OFF position trips the APU generator, closes the APU bleed air valve and extinguished the APU GEN OFF BUS light. When does shutdown occur?
Automatically after a 60 second delay.
Operate the APU for ____ before using it as a bleed air source, in order to extend the service life of the APU.
ONE MINUTE!
In flight, what happens if the APU is the only source for electrical power?
All galley busses are automatically shed
Can the APU be operated with the blue MAINT light illuminated?
Yes
An Amber APU OVERSPEED light is illuminated indicates ______ or the APU RPM limit has been exceeded resulting in an automatic shutdown.
The overspeed shutdown protection feature has failed a self test during normal APU shutdown.
The Amber APU FAULT light illuminates _____
Anytime a malfunction exists causing the APU to automatically shutdown.
It is acceptable to have an APU LOW OIL PRESSURE light illuminated during APU start?
Yes- True
On the PFD/ND where are the Secondary Engine indications normally displayed?
Lower DU
On the PFD/ND how is low oil quantity indicated?
In Reverse Viedo and LO (white)
On the PFD/ND what does pushing the MFD Engine (ENG) switch do?
Displays secondary engine indications on lower DU
Each engine is equipped with a thrust reverser that is operated _____.
Hydraulically
In the event of incomplete stowage or uncommanded movement of the thrust reverser sleeve toward the deployed position what will open the isolation valve and command the control valve to stow the thrust reverser?
Auto-Restow circuit
N1 Reference Bugs and readouts can be manually set by ___
Turning the N1 Set Inner Knob when the N1 Set Outer Knob is set to BOTH 1 or 2
____ conditions would cause an amber Engine Fail (ENG FAIL) alert
Engine N2 below sustainable Idle (50% N2) and engine start lever in IDLE position
A red N2 RPM display indicates
An operating limit is being exceeded
A steady illuminated amber START VALVE OPEN Alert Light indicates ___
The respective engine start valve is open and air is supplied to the starter
An illuminated amber REVERSER light on the after overhead panel indicates___
- The isolation valve or thrust reverser control valve is not in commanded position, one or more thrust reversers sleeves are not in commanded state, or a failure has been detected in synchronization shaft lock circuitry.
- The auto-restow circuit has been activated
An illuminated amber ENGINE CONTROL light on the after overhead panel indicates___
The engine control system is not dispatchable due to faults in the system
Moving the Engine Start Lever to Idle____, Energizes the ignition system through EECs, electrically opens spar fuel shutoff valve in the wing leading edge, outboard of the pylon.
Electrically opens engine-mounted fuel shutoff valve
What is the maximum continuous engine oil temperature?
140 degrees C
The minimum engine oil quantity prior to engine start is
70%
It is required for an engine to remain at IDLE for ____ minutes before changing thrust lever position when ambient temperatures are below -35 degrees C.
2 MINUTES
-35 degrees
What is the minimum oil pressure?
13 PSI
Which section of the compressor on the engine produces low temperature low pressure air?
N1
What occurs when FUEL FLOW Switch is placed in the RESET position?
The fuel used is reset to zero
What does a steady illuminated amber OIL FILTER BYPASS Alert light indicate?
There is an impending bypass of scavenge oil filter
What does a steady illuminated amber LOW OIL PRESSURE alert light indicate?
The oil pressure is at or below redline
What does blinking amber START VALVE OPEN alert light along with 2 solid amber boxes on the upper display indicate?
There is an uncommanded opening of start valve
What does Red Line on an Engine Limit Display indicate?
Maximum and minimum limits
Can the Forward Thrust Lever be advanced if the reverse thrust lever is in the deployed position?
No
In times other than engine starting, when electrical load and bleed air extraction combine to raise the EGT on the APU above acceptable levels____
bleed air extraction is reduced while maintaining electrical load
