Ensures bleed air supply for engine start.
Engine thrust lever
(operating engine) ................................ Advance thrust lever until bleed
duct pressure indicates 30 PSI
Non–operating engine.......................................................................Start
Use normal start procedures with crossbleed air.
After starter cutout, adjust thrust on both engines, as required.
Supplementary Procedures -Engines, APU 737 Operations Manual
High Altitude Airport Start Procedure (above 8400 feet)
For airplanes certified for operation at high altitude airports, accomplish the following:
Ignition select switch ....................................................................... Both
Engine start ...........................................................................Accomplish
The minimum start pressure is 30 psi minus .5 psi for each 1000 feet above sea level. At least 20% N2 RPM plus an indication of N1 rotation are required prior to introducing fuel to the engine. Engine acceleration will be much slower than during starts at lower altitudes. The engine start switch must be held to the GRD position until N2 RPM reaches 50%.
CAUTION: Do not attempt to re-engage the starter above 20% N2 if it is inadvertently allowed to cut out at 46% N2.
Note: Fuel fogging from the engine exhaust may occur during a
normal high altitude airport start.
PMC off Takeoff and Climb
This procedure must be accomplished only if PMC OFF performance data is available for the type of engines installed.
PMC switches ...................................................................................OFF
FMC/CDU TAKEOFF REF page .................................................. Select
OAT ..................................................................................................Enter Enter the actual airport ambient temperature. Note: N1 RPM will increase as speed increases during takeoff. The RPM increase could be as much as 7% depending on temperature and pressure altitude. The takeoff performance figures for PMC OFF account for the RPM change. DO NOT reduce thrust during takeoff unless engine parameters exceed other limits.
(CFM 56-3 engines operating at 22,000 pounds of takeoff thrust)
SEL TEMP ..................................................................................Enter
Copyright . The Boeing Company. See title page for details.
SP.7.4 June 4, 2004
Supplementary Procedures -Engines, APU 737 Operations Manual
With air conditioning pack switches AUTO for takeoff: If OAT is 50°F to 73°F (10°C to 23°C) and PA is 6,000 to 10,000 feet, enter 73F (23°C) for SEL TEMP.
With air conditioning pack switches OFF for takeoff: If OAT is 50°F to 81°F (10°C to 27°C) and PA is 3,000 to 10,000 feet, enter 81°F (27°C) for SEL TEMP.
If the above parameters are not applicable, do not enter SEL TEMP. In this case, takeoff may be accomplished using OAT for temperature reference.
If FMC is inoperative or not used:
N1 cursors ......................................................................................Set Set full rated thrust value for PMC OFF.
Takeoff thrust .......................................................................................Set Set thrust manually or with autothrottle by 60 knots.
After takeoff Thrust levers (if required) ........................................................ Adjust The N1 setting should be monitored throughout the climb, and the thrust levers reset as necessary. The pilot not flying will compute the thrust setting for cruise speed schedule prior to reaching cruise altitude.
Starting with Ground Air Source (AC electrical power available)
Engine No. 1 must be started first.
When cleared to start: APU BLEED air switch .............................................................. OFF Engine No. 1 start ............................................................ Accomplish
Use normal start procedures.
WARNING:To minimize the hazard to ground personnel, the external air should be disconnected, and engine No. 2 started using the Engine Crossbleed Start procedure.
Supplementary Procedures -Engines, APU 737 Operations Manual
APU Start
Note: With at least one generator operating, subsequent start attempts should be made at succeedingly lower altitudes until a satisfactory start is accomplished.
APU Switch..................................................................................START
Momentarily position APU switch to START and release to ON.
Check LOW OIL PRESSURE light illuminates, then extinguishes.
Check APU GEN OFF BUS light illuminates.
Note: The start cycle may take as long as 135 seconds.
Note: If extended APU operation is required on the ground and fuel is loaded in the center tank, place the left center tank fuel pump switch ON to prevent a fuel imbalance before takeoff.
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