Anyone experienced this?
 

Anyone experienced this - 737NG engine issue, reported tonight in Seattle news:
Troubles on takeoff with some Boeing 737NG engines | KING5.com Seattle

During my last PC before v1.

I've never seen it happen, nor even heard about it until now.

I am not surprised, if you have experienced it how quick does the engine respond when you disconnected the A/T and reduced the thrust lever.

Does not sound as though anyone is entirely sure what "it" is.

I've seen autothrottles disconnect as a result of the computer sensing N1 over commanded speed, but never have experienced an exceedence which broke an operating limitation (or even got close). Usually the triggering event for this mode is a low altitude level off or cut back, which Alaska might experience more than other operators. Never heard of such a thing leading to an exceedence. It is pretty easy to reach down and pull a thrust lever back, and we have immediate action items which prescribe just that action.

The CFM56 is probably the most reliable engine ever put on an airplane. It easily makes it's 30,000 hours on the wing.

In older designs the Fuel Controllers were limiting devices which reduced flow, leaving higher flow available in the event of a FCU or HMU failure to keep the engine running. Those would surge when a Fuel Controller broke or dropped off line. I think anyone with several thousand hours in a PW1XX series turboprop has seen that at least once.

Of course, this could not happen on a MD88. It has a FOC-U (First Officer Control Unit)

http://www.govliquidation.com/shared...arge_thumb.jpg

Usually quicker than your JT8D. The engine has automatic roll back and flame out protections, so no harm with pulling them to idle.

But, if the failure is somewhere in the DEEC and the HMU then I guess the thing might not respond. Never seen (or heard) of that happening. The throttles on the CFM56 are fancy dual redundant switches. They are an electronic connection to this:

http://www.boeing.com/commercial/aer.../art/fig1P.gif

Yeah, all yalls fancy computers have come home to roost. HA HA HA.

The MD88s fuel control system is simple and works.

http://webspace.webring.com/people/x...705/pulley.gif

If the failure was in the DEEC and HMU I would guess the same as that for 10 seconds is a long time for an event like that.

Weird, it doesn't happen to my Microsoft Flightsim X.

It's under advanced options. Go to:

File-> Options -> Realism Settings

and under the "Miscellaneous tab" ensure that the "Simulate TOGA surges" option is checked. It only occurs once every 700 takeoffs though. :cool: