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CS3-2730 Page1of4
Operations Manual Bulletin No. ILF2-43(R2), Dated April 1, 2001 (continued)
The flight crew can detect a large FMC position error by comparing relative positions of the airplane and runway symbols on the ND. On the POS REF page, individual IRS positions should be compared to the required alignment position (gate coordinates, etc.). If an initial position error is discovered before takeoff, a fast alignment with a correct position entry may not resolve the problem. A full alignment must be accomplished by rotating the IRS Mode Selectors to OFF, then to NAV, and entering the correct present position in the SET IRS POSITION line on the POS INIT page.
Also, due to an unrelated anomaly, the use of LAST POS for IRS alignment has not always resulted in correct IRS alignment. If the last positions stored in the FMCs differ, using either for IRS alignment may result in an incorrect alignment position.
Operating Instructions
This bulletin does not apply to airplanes modified by Service Bulletin 747-34A2672 (FMC software load 15).
During PREFLIGHT PROCEDURE -FIRST OFFICER:

after the GMT check, select the POS REF page and verify L, C, and R IRS position
coordinates are correct.

If an incorrect initial position is discovered in flight, the situation cannot be
corrected without full IRS realignment on the ground.

Operations Manual Information
The PREFLIGHT PROCEDURE -FIRST OFFICER has been revised to reflect the Operating Instructions of this bulletin.
Administrative Information
This bulletin replaces bulletin ILF2-43(R1) dated April 1, 1999. Discard Bulletin ILF2-43(R1). Revise the Bulletin Record to show ILF2-43(R1) 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 ILF2-43(R2) IN EFFECT (IE).
This Operations Manual Bulletin will be cancelled after Boeing has been notified all affected airplanes in your fleet have been modified by SB 747-34A2672. If you do not plan to modify all your airplanes and would like the contents of this bulletin incorporated in your Operations Manual, please advise Boeing accordingly. Please send all correspondence regarding Operations Manual Bulletin status to one of the following addresses:
Page 2 of 4
Operations Manual Bulletin No. ILF2-43(R2), Dated April 1, 2001 (continued)
Mailing Address: Manager, Flight Technical Publications (747-400)
Boeing Commercial Airplane Group P.O. Box 3707 M/C 20-89 Seattle, WA 98124-2207 USA 
Fax: Telex:  (206) 662-7812 32-9430 Station 627 
SITA:  SEABO7X 

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CS3-2730 Page4of4
Operations Manual Bulletin for International Lease Finance Corp.
The Boeing Company Seattle, Washington 98124-2207

Number: ILF2-44(R1)
Date: April 1, 1999 Document Effectivity: D6-30151-425 Subject: FMC TAKEOFF SPEEDS ANOMALY Reason: To inform flight crews of an FMC anomaly affecting takeoff speeds.
Revised for administrative purposes.
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
Boeing has received reports of the left and right FMS-CDUs and/or PFDs displaying different takeoff speeds. In one instance the FMS-CDUs displayed the
following: 
LEFT FMS-CDU  RIGHT FMS-CDU 
V1  150 (small font)  150 (large font) 
VR  150 (large font)  164 (large font) 
V2  164 (large font)  177 (large font). 

In another instance, the incorrect VR speed on an FMS-CDU was the same as the V1 speed on one PFD, while the other PFD displayed all speeds correctly. In other instances, FMS-CDUs displayed erroneous speeds, but all speeds were displayed correctly on both PFD’s.
Boeing is investigating this anomaly. However, it is not yet known whether the takeoff speeds are calculated differently (small font), or the speeds change when selected (large font). Therefore, Boeing recommends when selecting takeoff speeds during the BEFORE START PROCEDURE, flight crews compare the captain’s and first officer’s takeoff speeds.
CS3-2739 Page1of2
Operations Manual Bulletin No. ILF2-44(R1), Dated April 1, 1999 (continued)
Operating Instructions
Before and after selecting takeoff speeds during the BEFORE START PROCEDURE, compare the captain’s and first officer’s takeoff speeds. If any speed is incorrect, manually enter and select the correct speed and compare the displayed values.
　
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