4 There is no fan speed (N1) indication
_
a When the core has reached idle, and there is no N1
_ indication, a warning is sent to the flight deck. The operator must shut down the engine.
NOTE : The FADEC system has been programmed with starter
____ limits. If the sequences get close to any of these limits they will be taken into account before another start sequence or stall recovery is tried.
(e) If the engine has gone above the operational limits refer to (Ref. TASK 72-00-00-200-008).
(5) Unsatisfactory Operation above Idle
(a) N1 and/or N2 transitory overspeed.
CAUTION : ALL OVERSPEED CONDITIONS MUST BE CORRECTED. ENGINE
_______
DAMAGE CAN BE CAUSED.
1 Any fan speed (N1) of more than 104 percent or any core speed
_ (N2) of more than 105 percent are overspeeds. The throttle must be retarded to prevent the engine speed from going higher than these limits.
2 If the engine has gone above the operational limits refer to
_ (Ref. TASK 72-00-00-200-008).
(b) Engine stalls
CAUTION : BE CAREFUL WHEN CONTINUING TO OPERATE AN ENGINE THAT
_______ HAS HAD A SEVERE COMPRESSOR STALL. IT CAN STALL AGAIN AND CAUSE MORE ENGINE DAMAGE.
CAUTION : IF THE EGT IS HIGH OR IT INCREASES FAST DURING A SLOW
_______ THROTTLE ADVANCE, SHUT DOWN THE ENGINE AND DO NOT CONTINUE OPERATION.
CAUTION : IF VIBRATION INCREASES OVER PREVIOUS LEVELS, SHUT DOWN
_______ THE ENGINE AND DO NOT CONTINUE OPERATION.
CAUTION : ALL STALLS MUST BE CORRECTED.
_______
1 Engine stalls are caused by the aerodynamic disruption of the
_ normally smooth airflow through the compressor stages.
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This disruption of air flow can be caused by these conditions:Foreign objects being ingested into the engine or FOD. a Cracked or distorted compressor blades.
_ b Incorrect scheduling of the VSV or slow or sticking VSV
_ operation.A compressor stall may be indicated by these conditions: a Abnormal engine noises.
_ b Loud bangs with flame coming from the engine exhaust and
_ possibly from the engine inlet in severe cases.
c Performance parameters that are not stable.
_
d Very slow or no throttle response.
_
e High EGT, or a quick EGT increase when throttle is
_ advanced.Compressor stalls can cause: a Fatigue cracks in the compressor blades.
_
b Severe thermal deterioration of the hot section parts.
_
c This damage can cause the engine performance to deteriorate
_ or the engine to fail after a severe stall.
Usually, the effects of stalls take time to appear and will make it harder to determine which specific stall has caused the damage.
The effects of the stalls collect until they affect the engine durability, reliability, and operating cost.
Make sure that you know the operational conditions that occurted at the time of the stall. This will help in fault isolation.
If an engine stalls during acceleration or deceleration, and operating conditions permit it, do these steps:
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a Quickly (in 1 to 2 seconds) Retard the throttle to idle.
_ This will clear the stall.
b Monitor the EGT and N2 while they decrease to normal idle
_
indications.
c Advance the throttle slowly to find out if the stall will
_
occur again.
d Monitor the N1, N2, vibration, fuel flow, and EGT
_ indications to make sure that they are normal and that they follow the thrust lever movement.
e Make sure that the vibration levels are normal.
_ f If the stall does not occur again and the N2 and EGT
_ indications are normal, continue engine operation.
g If the stall occurs again or does not clear properly,
_ operate the engine at minimum idle for 3 minutes and then shutdown the engine.
10 Make a record of the operational conditions at the time the
__ stall occured to help the troubleshooting.
11 Do the engine stall inspection in the procedure (Ref. TASK 72-
__
00-00-200-008).
(c) Engine flameout 1 An engine flameout, can be identified by an immediate decrease
_ in EGT, N2, fuel flow, and oil pressure. This will be closely followed by a decrease in N1.
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