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B-28 Page 2 of 4 D6-27370-866-EGP
Flight Crew Operations Manual Bulletin No. EGP-28 R1, Dated January 9, 2015 (continued)
The first software revision was introduced into the 737NG fleet in July 2009 and
affects all 737NG airplanes with EEC software version 7.B.U1 or 7.B.V2.
EEC software version 7.B.W is now available from CFMI. When both engines
are providing ECS bleed air to the airplane, 7.B.W restores the high altitude
accelerations rates to the same rates that were present prior to the reduction
introduced in 7.B.U1.
Operating Instructions
Until 7.B.W software is installed, pilots may want to use the following
techniques to avoid excessive speed loss due to slow engine acceleration:
1. Use the autopilot and autothrottle as much as possible.
2. When established at cruise altitude, manually select either CLB or CONT
on the FMC N1 Limit page. This will ensure maximum available thrust.
3. If the airplane experiences a sudden increase in airspeed that causes the
autothrottle to reduce thrust, manually guard the thrust levers to maintain
a minimum of 60% N1, if possible. If thrust is reduced below 60% N1, a
significantly longer time will be required for the engines to spool up if the
time at idle thrust is less than 60 seconds.
4. If the airplane experiences a sudden increase in airspeed, consider using
smooth extension of the speed brakes to increase drag and to avoid large
thrust reductions.
5. No specific crew actions are needed if the thrust remains at idle for longer
than 60 seconds or if the descent is to an altitude below FL300. Normal
engine acceleration can be expected in these cases.
Administrative Information
This bulletin replaces bulletin EGP-28 , dated October 1, 2012. Revise the Flight
Crew Operations Manual Bulletin Record Page to show bulletin EGP-28 as
“CANCELLED” (CANC).
Insert this bulletin behind the Bulletin Record page in Volume 1 of your Flight
Crew Operations Manual (FCOM). Amend the FCOM Bulletin Record page to
show bulletin EGP-28 R1 "In Effect" (IE).
This FCOM bulletin will be cancelled when an operator reports EEC software
version 7.B.W has been installed via the applicable CFMI Service Bulletins on
all 737NGs in their fleet.
The applicable CFMI Service Bulletins are:
·CFM56-7B S/B 73-0204 “ENGINE FUEL AND CONTROL - Electronic
Control Unit (73-21-60) - New Software Versions 7.B.WF3 for SAC and DAC
Engines and 7.B.WF2 for SAC Engines” or
September 24, 2015
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