Copyright . The Boeing Company. See title page for details.

Normal Procedures -Amplified Procedures 737 Flight Crew Operations Manual
If the center tank fuel quantity exceeds 460 kilograms: LEFT and RIGHT CENTER FUEL PUMPS switches – ON
Verify that the LOW PRESSURE lights illuminate momentarily and then extinguish. If the LOW PRESSURE light stays illuminated turn off the
CENTER FUEL PUMPS switch. AFT and FORWARD FUEL PUMPS switches – ON Verify that the LOW PRESSURE lights are extinguished. Hydraulic panel................................................................. Set F/O If pushback is needed and the nose gear steering lockout pin is not installed:
WARNING:Do not pressurize hydraulic system A. Unwanted tow bar movement can occur.
System A HYDRAULIC PUMP switches – OFF Verify that the system A pump LOW PRESSURE lights are illuminated. System B electric HYDRAULIC PUMP switch – ON Verify that the system B electric pump LOW PRESSURE light
is extinguished. Verify that the brake pressure is 2,800 psi minimum. Verify that the system B pressure is 2,800 psi minimum.
If pushback is not needed, or if pushback is needed and the nose gear steering lockout pin is installed:
Electric HYDRAULIC PUMP switches – ON Verify that the electric pump LOW PRESSURE lights are extinguished.
Verify that the brake pressure is 2,800 PSI minimum. Verify that the system A and B pressures are 2,800 psi minimum. ANTI COLLISION light switch .......................................ON F/O
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Normal Procedures -Amplified Procedures 737 Flight Crew Operations Manual

Trim ...................................................................................Set  C 
Check each trim for freedom of movement. 
Stabilizer trim – ___ UNITS 
Set the trim for takeoff. 
Verify that the trim is in the green band. 
Aileron trim – 0 units 
Rudder trim – 0 units 
Call “BEFORE START CHECKLIST.”  C 
Do the BEFORE START checklist.  F/O 

Pushback or Towing Procedure
The Engine Start procedure may be done during pushback or towing.
Establish communications with ground handling personnel. C
CAUTION: Do not hold or turn the nose wheel steering wheel during pushback or towing. This can damage the nose gear or the tow bar.
CAUTION: Do not use airplane brakes to stop the airplane during pushback or towing. This can damage the nose gear or the tow bar.
Set or release the parking brake as directed by ground handling personnel. C When pushback or towing is complete: Verify that the tow bar is disconnected. C Verify that the nose gear steering lockout pin is removed. C System A HYDRAULIC PUMPS switches – ON. F/O
Engine Start Procedure 
Select the secondary engine indications.  F/O 
Air conditioning PACK switches ....................................OFF  F/O 
Copyright . The Boeing Company. See title page for details. 

Normal Procedures -Amplified Procedures 737 Flight Crew Operations Manual
Start sequence ........................................................ Announce  C 
Call “START ___ ENGINE”  C 
ENGINE START switch ................................................ GRD  F/O 
Verify that the N2 RPM increases.  C, F/O 

When N1 rotation is seen and N2 is at 25%, or (if 25% N2 is not possible), at maximum motoring and a minimum of 20% N2:
Engine start lever ..................................................... IDLE

Monitor fuel flow and EGT indications. C, F/O
At 56% N2, verify that the ENGINE START switch moves to OFF. If not, move the ENGINE START switch to OFF. F/O
Verify that the START VALVE OPEN alert extinguishes when the ENGINE START switch moves to OFF. F/O
Call: “STARTER CUTOUT.” F/O
Monitor N1, N2, EGT, fuel flow and oil pressure for normal indications while the engine accelerates to a stable idle. C, F/O
After the engine is stable at idle, start the other engine.
Starter duty cycle:
.
Do not exceed 2 minutes during each start attempt

.
A minimum of 10 seconds is needed between start attempts

Normal engine start considerations:

.
do not move an engine start lever to idle early or a hot start can occur

.
keep a hand on the engine start lever while monitoring RPM, EGT and fuel flow until stable

.
if fuel is shutoff accidentally (by closing the engine start lever) do not reopen the engine start lever in an attempt to restart the engine

.
failure of the ENGINE START switch to stay in GRD until the starter cutout RPM can cause a hot start. Do not re–engage the ENGINE START switch until engine RPM is below 20% N2.
　
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