BOEING 737 HYDRAULIC SYSTEMS
EXAM QUESTIONS AND ANSWERS
Is the loss of a hydraulic system considered an emergency? - Answer-Yes
What is the most common cause of a hydraulic system failure? - Answer-A leak in
the reservoir or a ruptured hydraulic line
How many hydraulic systems are there on the B-737? - Answer-3- A system, B
system and the standby system
How many and what kind of pumps does the A hydraulic system use? - Answer-2
hydraulic pumps, one engine and one electrical
If the A hydraulic system is lost, is there a backup to the ailerons and elevators on
the B-737? - Answer-Yes, on the B hydraulic system
If both the A and B hydraulic systems are lost, is there a backup for the ailerons and
elevators on the B-737? - Answer-Yes, and it is called manual reversion. It is a
system of wire cables that run from the cockpit out to the control surface.
Is there a backup for the flaps o the B-737 if the B hydraulic system is lost? -
Answer-Yes, electric flaps
Is there a backup for the LEDs on the B-737 if the B hydraulic system is lost? -
Answer-Yes, the standby hydraulic system
Is there a backup for the inboard and outboard spoilers if hydraulics are lost on the
B-737? - Answer-No, the spoilers do not have a backup
Is there a backup to the rudder on the B-737 if the A hydraulic system is lost? -
Answer-The rudder can be run by all three systems
Which system supplies hydraulic power to the brakes? - Answer-The B system
If the B hydraulic system is lost, is there a backup to the brakes? - Answer-Yes,
there are two backups for the brakes. There is the brake interconnect that ties the
brakes to the A system, and then there is a brake accumulator bottle
What is the normal operating pressure for all three hydraulic systems? - Answer-
3,000 psi (pounds per square inch)
Which engines have hydraulic pumps? - Answer-Engines 1 and 2
How many and what kind of pumps does the B hydraulic system use? - Answer-2
hydraulic pumps, one engine and one electrical
EXAM QUESTIONS AND ANSWERS
Is the loss of a hydraulic system considered an emergency? - Answer-Yes
What is the most common cause of a hydraulic system failure? - Answer-A leak in
the reservoir or a ruptured hydraulic line
How many hydraulic systems are there on the B-737? - Answer-3- A system, B
system and the standby system
How many and what kind of pumps does the A hydraulic system use? - Answer-2
hydraulic pumps, one engine and one electrical
If the A hydraulic system is lost, is there a backup to the ailerons and elevators on
the B-737? - Answer-Yes, on the B hydraulic system
If both the A and B hydraulic systems are lost, is there a backup for the ailerons and
elevators on the B-737? - Answer-Yes, and it is called manual reversion. It is a
system of wire cables that run from the cockpit out to the control surface.
Is there a backup for the flaps o the B-737 if the B hydraulic system is lost? -
Answer-Yes, electric flaps
Is there a backup for the LEDs on the B-737 if the B hydraulic system is lost? -
Answer-Yes, the standby hydraulic system
Is there a backup for the inboard and outboard spoilers if hydraulics are lost on the
B-737? - Answer-No, the spoilers do not have a backup
Is there a backup to the rudder on the B-737 if the A hydraulic system is lost? -
Answer-The rudder can be run by all three systems
Which system supplies hydraulic power to the brakes? - Answer-The B system
If the B hydraulic system is lost, is there a backup to the brakes? - Answer-Yes,
there are two backups for the brakes. There is the brake interconnect that ties the
brakes to the A system, and then there is a brake accumulator bottle
What is the normal operating pressure for all three hydraulic systems? - Answer-
3,000 psi (pounds per square inch)
Which engines have hydraulic pumps? - Answer-Engines 1 and 2
How many and what kind of pumps does the B hydraulic system use? - Answer-2
hydraulic pumps, one engine and one electrical
