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Effective Pages will be updated in a future revision.
Remove and replace pages in your QRH as follows:
Administrative Information
This bulletin replaces bulletin ILF2-50 dated November 15, 2000. Discard
Bulletin ILF2-50. Revise the Bulletin Record to show ILF2-50 CANCELLED
(CANC).
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 ILF2-50(R1) “Incorporated” (INC).
This condition is temporary until the system is modified. This bulletin will be
revised to include Service Bulletin information when available.
CS3 2944
Remove Page No. Date Insert Page No. Date
NNC.9.1 November 15, 2000 NNC.9.1 November 15, 2000
NNC.9.2 November 15, 2000 NNC.9.2 March 15, 2001
Page 1 of 2
Sect Name Section Name
Operations Manual Bulletin
for
The Boeing Company
Seattle, Washington 98124-2207
International Lease Finance Corp.
Number: ILF2-51
Date: December 19, 2000
Document Effectivity: D6-30151-425
Subject: INCORRECTMANEUVERING SPEEDS FOR FLAP RETRACTION
Reason: To inform flight crews of a revision to normal procedures to prevent
THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
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.
takeoff with incorrect flap maneuvering speeds displayed on the PFD.
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
Page 2 of 2
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 OperationsManual 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
747 Operations Manual
Limitations Chapter L
Table of Contents Section 0
Copyright © The Boeing Company. See title page for details.
D6-30151-425 L.TOC.0.1
Operating Limitations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . L.10.1
　
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