EEC
 

Hi,

Regarding the EEC normal mode, the 737 FCOM says:

"The full rated takeoff thrust for the installed engine is available at a thrust lever position less than the forward stop. Fixed or assumed temperature derated takeoff thrust ratings are set at a thrust positions less than full rated takeoff. The maximum rated thrust is available at the forward stop."

My question here is.. Does the above means that during takeoff, I shoudn't move the thrust levers to the forward stop position so I can get the EEC calculated full rated takeoff? or it is mean, during takeoff, when moving the thrust lever to forward stop, the ECC will give me the full rated takeoff thrust?

My second question is, does the EEC calculates the N1 thrust ratings in the Alternate mode (soft and hard) as in the Normal mode?


Thanks,
wof

Hi wof,

When Boeing say 'Max thrust' this means the throttle is at the forward stop and indicates an N1 of 106%

Usually on takeoff the EEC calculated N1 is around the range of 99 -100.1% and this is less than full throttle so in the event of windshear on take off for example the pilot can push the throttle forward to its forward limit and get 'Max thrust'.

So to answer the question on take off set the thrust levers to get the target N1, if the thurst levers are at the forward stop then I would assume something is wrong, to clear the assume temp N1 target you can press the TOGA button to clear it and then you will get the Max N1 limit and the N1 will go to red. (If im wrong some one please correct me)

For your second question...if I remember right you cant dispatch with the EEC in alternate mode but I might be wrong on that one. In flight the EEC in hard alternate mode the EEC use internal software table to calculate mach number thrust thrust settings. During hot days N1 and EGT can exceed its limits.