ENGINE LIMIT/SURGE/STALL

[FMC OVERHEAT]

Hi ,
In case of EGT approaching or exceeding limits the B737 ENGINE LIMIT/SURGE/STALL checklist calls for “A/T disengage and Thrust lever retard until indications remain within appropriate limits or thrust lever is closed”.
Let’s say shortly after takeoff, we have a red warning light on and EGT really exceeded limits (930 deg). According to the checklist we have to retard the thrust lever until indications remain within limits but doesn’t that create problems for single engine performance especially for second segment climb? I had this scenario once while climb limited weight with no bleed takeoff OAT was 39 deg.
The checklist doesnt state when you should start to retard the lever but i suppose it is like an engine fire case (400ft AGL).

Thanks,

[lomapaseo]

I'm not exactly sure of what your question is here, but fundamentally it's far more important to fly the aircraft than to take precipitous action with any engine annomaly. Sure you can retard a throttle and clear many surges as well as reduce EGT. But it seems like a good idea to be in an established safe flight regime before you start grabbing throttles.

[Jet_Settin]

From the B737 FCTM :

"During takeoff,if an engine exceedance occurs after thrust is set and the decision is made to continue the takeoff, do not retard the thrust lever in an attempt to control the exceedance. Retarding the thrust levers after thrust is set invalidates takeoff performance. When the PF judges that altitude (minimum 400 Ft AGL) and airspeed are acceptable, the thrust lever should be retarded until the exceedance is within limits and the appropriate NNC acomplished"

Bottom line is ....no memory or recall items before 400 Ft AGL no matter what kind non-normal condition occurs.

[captjns]

Right from the Boeing QRH

ENGINE LIMIT/SURGE/STALL

One or more of the following conditions:

• Engine RPM or EGT indications are abnormal, approaching or exceeding limits

• No response to thrust lever movement
• Abnormal engine noises:

AUTOTHROTTLE (if engaged) . . . . . . . . . . . . . . .DISENGAGE

[Allows thrust lever to remain where manually positioned.]


THRUST LEVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . RETARD

Retard until indications remain within appropriate limits or the thrust lever is closed.

If indications are abnormal or EGT continues to increase:

ENGINE START LEVER . . . . . . . . . . . . . . . . . . . . . . CUTOFF


Per the Boeing QRH, the thrust lever is retarded until indications remain in the approriate limits. If not than the thrust lever is closed.

[BOAC]

1) If performance is CRITICAL - delay the throttle closure and log the overtemp and time of same. Fly the OEI procedure.

2) If just 'exciting', retard the throttle and fly the OEI procedure.

In both cases you will probably have better than engine out performance.