PPRuNe Forums - View Single Post - Firewall an NG - what do you get
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Old 9th Mar 2004, 06:51
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DDG
 
Join Date: Oct 2003
Location: OZ
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LOKE,
If you fire wall an NG aircraft you get the maximium thrust for that motor,ie if the CDU Ident page shows you have the following;
CFM56-7b18=19500lbs
CFM56-7b20=20600lbs
CFM56-7b22=22700lbs
CFM56-7b24=24200lbs
CFM56-7b26=26400lbs
CFM56-7b27=27300lbs of thrust at the "firewall".
Take off power settings are only allowed for 5min,Max continous for 10min as per the AMM however you can exceed these provided you DO NOT exceed the 925c EGT limit,exceed the EGT limit and you are dependant upon the amount of temp & time spend in exceedance as to whether you inspect/repair/replace the engine.
You can only buy an up-rate for you engine by purchasing the software disks to reprogram the EEC for the new parameters,change the engine ident plug and provided you also have the correct HMU/fuelpump package as there is service bulletins listing the requirements.
The FDAMS are checked daily and are used for trend monitoring/ETOPS reliability data.The FDAMS takes a "snap shot" of all engine parameters at Takeoff,Stable cruise,and postflight .At the company i work for,All this data is sent to CFMI in the USA who track the data and advise the operator of any major problems upon discovery,reliability reports are sent regularly.
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