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takeoff with incorrect flap maneuvering speeds displayed on the PFD.
Information in this bulletin is recommended by The Boeing Company, but may not be FAA approved at the time of writing. In the event of conflict with the FAA approved Airplane Flight Manual (AFM), the AFM shall supersede. The Boeing Company regards the information or procedures described herein as having a direct or indirect bearing on the safe operation of this model airplane.
THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
Background Information
An operator recently reported a flight crew experienced stick shaker during flap retraction after takeoff. Engineering investigation shows flaps were retracted below the airspeed required for the airplane gross weight due to erroneous flap maneuvering speeds displayed on the PFD. The erroneous speeds resulted from an incorrect speed entry in the FLAP/SPEED line on the CDU APPROACH REF Page.
Displayed flap maneuvering speeds for takeoff are normally based on current airplane gross weight. However, when a speed has been entered in the FLAP/SPEED line (4R) on the APPROACH REF Page, the flap maneuvering speeds are based on that speed regardless of actual airplane gross weight. In normal operation, the entry made for approach on the previous flight is cleared when engines are shut down after landing and the FLAP/SPEED line remains blank for takeoff. If an entry is made in the FLAP/SPEED line prior to takeoff (for example, training on the CDU prior to preflight) and the entry is not deleted, the
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Operations Manual Bulletin No. ILF2-51, Dated December 19, 2000 (continued)
displayed flap maneuvering speeds will be based on that entry. The range of valid entries in the FLAP/SPEED line may be outside the normal operating parameters for existing airplane weight. Since the APPROACH REF page is not normally checked during preflight, an entry in the FLAP/SPEED line may go undetected by the flight crew and result in display of incorrect flap maneuvering speeds.
The amber minimum maneuvering speed display and pitch limit indicator are not affected by a speed entry in the FLAP/SPEED line and continue to provide valid data. While the AFDS is designed to prevent slowing into the amber minimum maneuvering speed band, when flaps are retracted early the AFDS may not react quickly enough to prevent stick shaker activation.
Operating Instructions
During preflight, verify the FLAP/SPEED line on the CDU APPROACH REF Page is blank. Refer to the revised Preflight Procedures provided with this bulletin.
Operations Manual Information
The attached pages replace an entire Normal Procedures section in your Operations Manual. The List of Effective Pages will be updated in a future revision.
Remove Section 20 of Chapter NP from Volume 1 of your Operations Manual and replace it with the attached pages.
Administrative Information
Insert this bulletin behind the Operations Manual Bulletin Record page in Volume 1 of your Operations Manual. Amend the Operations Manual Bulletin Record to show bulletin ILF2-51 “In Effect” (IE).
This condition is under investigation. This bulletin remains in effect until further notice.
CS3 2962
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OperatingLimitations................................. L.10.1
General ............................................ L.10.1
AirplaneGeneral..................................... L.10.1
OperationalLimitations............................. L.10.1
Non–AFMOperationalInformation................... L.10.1
WeightLimitations ................................ L.10.2
DoorMountedPowerAssistsandEscapeSlides ......... L.10.2
AirSystems......................................... L.10.2
CabinPressurization ............................... L.10.2
Autoflight.......................................... L.10.2
Autopilot/FlightDirectorSystem ..................... L.10.2
AutomaticLanding ................................ L.10.3
Communications..................................... L.10.3
VHFRadios...................................... L.10.3
Engines,APU....................................... L.10.3
EngineLimitDisplayMarkings ...................... L.10.3
EngineFuelSystem................................ L.10.3
EngineIgnition ................................... L.10.3
ReverseThrust.................................... L.10.4
Non–AFMOperationalInformation................... L.10.4
AirplaneStructure.................................... L.10.4
FlapOperation.................................... L.10.4
WarningSystems..................................... L.10.4
TCAS........................................... L.10.4
Copyright.TheBoeingCompany.Seetitlepagefordetails.
October 1, 2000 D6-30151-425 L.TOC.0.1
Limitations -Table of Contents 747 Operations Manual
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