(non-memory)
319: CFM 56-5B6/P rated at 23,500 lbs. thrust
320: CFM 56-5B4/P rated at 27,000 lbs. thrust
321: CFM 56-5B3/P
rated at 32,000 lbs. thrust
Max Starting Temp: 725° C
Max Continuous Temp: 915° C
TOGA Temp: 950° C (5 mins.)
12.5 qts. Min for dispatch (U) (PH 2.14.5)
FADEC controlled (Full Authority Digital Engine
Control) (PH 16.1.3)
Each FADEC is a two channel computer with one channel active
and the other used as backup. Each FADEC has its own alternator that powers it
once N2 is above a certain value. If the alternator fails normal ships power
will take over.
Three idle modes:
Ø Modulated: Varies with demand, in flight with
flaps at 0
Ø Approach: Depends only on altitude, activated
when flaps not at 0
Ø Reverse: Selected when on ground and
thrust levers at idle, slightly
higher
than forward idle.
Five Thrust Lever Detents:
Ø TOGA: Takeoff go-around
Ø FLX/MCT: Flex takeoff, Max
continuous
Ø CL: Climb thrust
Ø IDLE: Idle thrust for
forward and reverse
Ø FULL REV: Maximum reverse thrust
Continuous ignition provided automatically (with Mode selector
in NORM) when:
Ø Engine
ANTI ICE on
Ø Engine
flameout in-flight detected
Ø EIU fails
Continuous ignition may be selected manually by positioning
the ENG MODE selector to IGN/START
Normal Start Sequence:
Note: start ENG
1 first to pressurize Green Hydraulics
Ø ENG Mode
selector to IGN/START
Ø ENG Master
switch to ON (after amber X’s go away)
At 16 %
ignition ON
At 22%
starts fuel flow
At 50%
start valve closes, ignition off
Engine idle
should stabilize at about 58%
Ø ENG mode
selector to NORM
Normal Idle – 2,4,6,6 – Approx. 20% N1, 400° C EGT, 60% N2,
600 lbs/hr FF
Manual Start Sequence:
Ø ENG Mode
selector to IGN/START
Ø ENG MAN
START pb ON
Ø At Max
Motoring (min. 20% N2) select ENG Master switch ON
Fuel and
ignition will begin when ENG Master selected ON
At 50%
start valve closes, ignition off
N2 background “grays out” during start, returns to normal
when stabilized at idle
Ignition A or B will show on SD during normal start, A &
B during manual start
Note: For first flight of day run engines for at least 5 mins. before applying takeoff thrust, for subsequent flights warm up engines at least 3 mins. Run at least 1 min. after landing.
APU can supply can electrical up to 39,000’ and supply full
electrical load up to 25,000’ and bleed air up to 20,000’. Electrical takes
precedence over bleed air. APU bleed is NOT permitted for Wing anti-ice. The
APU is fed fuel from left fuel manifold. If no other fuel boost is available
the APU will activate a separate dedicated APU fuel pump. In flight (above 100
kts.) on bat only the APU will not start (RAT failed). With RAT (loss of GEN 1
& 2) the APU is allowed 3 minutes for a start attempt.
The APU can supply the entire electrical system on the
ground. In the air the APU will not supply the main galley shed busses.
The APU will auto shutdown and fire the extinguisher bottle
on the ground but not in-flight. In-flight the APU must be manually shut down
and extinguished for fire. If the APU SHUT OFF pushbutton on the external panel
or the APU FIRE pb on the overhead FIRE panel is pressed the APU will shutdown
but the extinguisher will not automatically fire. Note: APU will auto
shutdown in-flight for reasons other than fire.
The APU generator will automatically come online if engine
gens. or external is not already online. The APU is ready for bleed and
electrics when reaching 95% for two seconds or 99.5%. The AVAIL light will show
in the APU start pb and green APU AVAIL will show on EWD display when APU gen
is available for use.
APU bleed may be selected on whenever needed and APU will
allow bleed to come online after allowing time for EGT to stabilize. On
shutdown the APU Master is pushed off. The APU will continue to run for cooling
period before shutting down. If the APU Master is pressed back on before the
APU shuts down the APU will continue to run. When shutting the APU down for the
Parking & Securing checklist wait 2 mins. after APU Avail light goes out
before switching batteries off. If APU is left running, leave batteries on for
fire protection.
APU Bleed is actually supplied by APU load compressor.
The Line method for starting the APU and putting it
“online”:
Ø Press APU
Master Switch pb ON
Ø Wait about
3 seconds then press APU Start pb ON
Ø Press APU
Bleed pb ON
That’s it! If EXT PWR is not already established online the APU GEN will automatically come online followed by APU bleed air after the proper interval which will automatically turn on the packs assuming their pb’s are in the normal on (switch blank) position. Isn’t technology wonderful! You can start the APU before your walk around and the APU will be heating the cabin and have air pressure available for the coffee maker by the time you get back!