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Laboratory and incident analyses show up to eight minutes may elapse after the flight crew modifies the route and the effects of the anomaly become apparent. During this time the FMCs function normally. Once the anomaly is apparent, for example FMC messages appear or CDU pages disappear, it takes between 30 and 70 seconds for the resets to complete.
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Operations Manual Bulletin No. ILF2-47(R2), Dated April 1, 2001 (continued)
Note: While the FMCs are undergoing reset and resynchronization, any modifications or selections on either CDU will prolong the reset and resynchronization period. During one reported incident, reset/resynchronization exceeded eight minutes due to repeated flight crew CDU keystroke selections.
While the FMCs are undergoing reset and resynchronization, the ND MAP display blanks. The ND VOR and ND APP modes are still available. The navigation radios will remain on the same frequencies as before the FMC reset began.
Operating Instructions
This bulletin does not apply to airplanes modified by Boeing Service Bulletin 747-34A2672 (FMC Software load 15).
1.
A route discontinuity frequently results when adding or modifying the arrival portion of the flight plan. Should the modified route contain a waypoint that already exists in the active route, do not close a discontinuity by placing the downtrack duplicate waypoint in the discontinuity boxes, or in the waypoint sequence immediately after the first occurrence of the duplicate. Instead, close the discontinuity by entering the downtrack duplicate on top of the first occurrence of the waypoint.

Note: if the first occurrence of the waypoint is the active waypoint, the anomaly will not occur.

2.
If the anomaly is experienced (duplicate waypoint not discovered prior to execution of the modification), the FMCs may reset several times. Three outcomes are possible:

A. Both FMCs may reset several times and recover with an inactive route and no performance data. Reenter performance data and the route. Begin by reentering origin and destination. This sequence is very important --do not activate and execute the inactive route. If the inactive route is simply activated and executed, the FMCs will again reset and may fail. When reentering the route, follow the steps in paragraph one above for a route discontinuity.
B. Both FMCs may reset several times and recover with no flight plan data. Reenter performance data and the route. When reentering the route, follow the steps in paragraph one above for a route discontinuity.
C. Both FMCs may reset several times and fail. If the EICAS alert messages FMC LEFT and/or FMC RIGHT display, accomplish the FMC LEFT, RIGHT non-normal checklist.
Note: While the FMCs are undergoing reset and resynchronization, do not attempt any modifications or selections on either CDU. This will prolong the reset/resynchronization process.
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Operations Manual Bulletin No. ILF2-47(R2), Dated April 1, 2001 (continued)
Administrative Information
This bulletin replaces bulletin ILF2-47(R1) dated October 29, 1999. Discard Bulletin ILF2-47(R1). Revise the Bulletin Record to show ILF2-47(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 ILF2-47(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:
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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Operations Manual Bulletin
for
International Lease Finance Corp.

The Boeing Company Seattle, Washington 98124-2207

Number: ILF2-48(R1)
Date: April 1, 2001 Document Effectivity: D6-30151-425 Subject: VNAV ALTITUDE CAPTURE ANOMALY Reason: To inform flight crews the airplane may pitch over during VNAV cruise
altitude capture at high altitude. Revised to add Service Bulletin information.
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.
　
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