Engine Failure Identification
Engine Failure Scenarios:
The ENG FAIL indication tells you that the N2
is lower than 50% while the start lever is in the
idle detent.
1. If no abnormal sounds or vibrations exist, this
would likely indicate a FLAMEOUT.
Accomplish Engine Failure or Shutdown C/L
40.8
2. If a loud bang is heard, this would likely
indicate a COMPRESSOR STALL.
Accomplish Engine Limit, Surge or Stall C/L
3. If Engine N1 and/or N2 are fluctuating wildly,
this would likely indicate an ENGINE SURGE.
Accomplish Engine Limit, Surge or Stall C/L
4. If EGT limits (red) are exceeded with abnormal
engine noises and airframe vibrations, this would
likely indicate ENGINE SEVERE DAMAGE.
Accomplish Engine Fire, Severe Damage or
Separation C/L
OTHER POSSIBILITIES IN THE STALL/SURGE SCENARIO:
SURGE: The compressor manages to reestablish compression after the airflow has stalled. If the engine is
allowed to continue to surge, the turbine will eventually get very hot (high EGT) due to poor airflow over the
turbine as the engine surges. A loud bang is heard for every surge.
STALL: The compressor does not manage to reestablish compression after the airflow has stalled and the
engine will fade down to windmill speeds (N1=12% and N2=8%). A loud bang is heard when it stalls.
5. If the N1 and/or N2 are exceeded, this would
likely indicate an ENGINE RUNAWAY.
This indicates a fault in the fuel metering unit in
the HMU or the EEC commanding too much fuel
supply from the HMU.
Accomplish Engine Limit, Surge or Stall C/L
1|Page
Engine Failure Identification
6. If there is damage inside the engine this can
cause abnormal engine indications and high
airframe vibration, this would likely indicate
ENGINE SEVERE DAMAGE.
Accomplish Engine Fire, Severe Damage or
Separation C/L
7. If there are compressor stalls/surges due to the
damage, plus loud engine noises well, this would
likely indicate ENGINE SEVERE DAMAGE.
Accomplish Engine Fire, Severe Damage or
Separation C/L
8. If N1 and/or N2 stop to rotate and indicate 0%
this would likely indicate an ENGINE SEIZURE.
Accomplish Engine Fire, Severe Damage or
Separation C/L
NOTE: As the range of N1 is approx. 2000 to 5000
RPM, and the range of N2 is approx. 9000 to 15000
RPM, the inertia from the rotating parts makes it
practically impossible to seize. Severe engine
damage will lead to abnormal engine indications
and airframe vibrations. If vibration level gets too
high, the engine will probably separate.
QRH Memory Items - Example: Engine Severe Damage
EIng
F
nRgE
ineW2
1A-RFi
FN
ireand
andEFI
ngiRnEe W
2 -AFRirNe
1
ENGINE FIRE
or
Engine Severe Damage or
Separation
ENGINE FIRE or Engine Severe Damage or Separation
Condition:
One or more of these occur:
•Engine fire warning
•Airframe vibrations with abnormal engine
indications
•Engine separation.
1 Autothrottle (if engaged) . . . . . . . . . . .Disengage
2 Thrust lever
(affected engine) . . . . . . Confirm . . . . . . . Close
3 Engine start lever
(affected engine) . . . . . . Confirm . . . . . CUTOFF
4 Engine fire switch
(affected engine) . . . . . . Confirm . . . . . . . . Pull
To manually unlock the engine fire switch, press
the override and pull.
5 If the engine fire switch or ENG OVERHEAT light is
illuminated:
Engine fire switch
(affected engine) . . . . . . . . Rotate to the stop
and hold for 1 second
2|Page
Engine Failure Identification
Source: Boeing
3|Page
Engine Failure Identification
Suggested Crew Callouts - Example: Engine Severe Damage Engine No. 2
PF
PM
Landing gear up, aircraft under control, minimum 400 feet AGL.
"Identify Failure"
PM identifies the failure.
Using Upper DU, Lower DU and Engine Fire panel.
Example:
"Low N1 Engine No.2, High EGT Engine No.2, Low
N2 Engine No.2, Loud Bang, No Fire"
After PF agrees with failure diagnosis:
"Memory Items"
"Engine Severe Damage, Engine No. 2"
"Autothrottle disengage"
PF disengages the autothrottle.
"Thrust lever No. 2 confirm close?"
PF puts a hand on thrust lever No. 2.
"Close"
PF moves the thrust lever to Close
"Confirm"
PM puts a hand on engine start lever No. 2.
"Engine start lever No. 2 confirm cutoff?"
PF confirms the selected eng. start lever.
"Confirm"
"Cutoff"
PM moves engine start lever No. 2 to Cutoff.
PM puts a hand on engine fire switch No. 2.
"Engine fire switch No. 2 confirm pull?"
PF confirms the selected engine fire switch.
"Confirm"
"Pull"
PM pulls engine fire switch No. 2.
Check that neither the engine fire switch nor
engine overheat light is illuminated.
"Memory Items completed"
NOTE:
If fire warning or overheat light is illuminated, the additional memory item to
rotate the engine fire switch must be accomplished before memory Items are completed.
References:
FCTM 8.15 - 8.20
QRH CI.2.1 - 2.8
OM-B Vol.1 3.2.8 - 3.2.9.1
OM-B Vol. 2 Chapter 7 & 8
4|Page