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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 theGMT 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 3 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: (206) 662-7812
Telex: 32-9430 Station 627
SITA: SEABO7X
CS3 - 2730 Page 4 of 4
Intentionally
Blank
CS3 - 2739 Page 1 of 2
Sect Name
Operations Manual Bulletin
for
The Boeing Company
Seattle, Washington 98124-2207
International Lease Finance Corp.
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.
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.
Revised for administrative purposes.
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.
Page 2 of 2
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
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