Page 2 of 2
Operations Manual Bulletin
for
International Lease Finance Corp.
The Boeing Company Seattle, Washington 98124-2207
Number: ILF2-45(R1)
Date: April 1, 2001 Document Effectivity: D6-30151-425 Subject: REQUIRED TIME OF ARRIVAL (RTA) FUNCTION ANOMALY Reason: To inform flight crews of an FMC anomaly resulting from data link entry
of an RTA clearance. 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.
THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
Background Information
There has been one reported occurrence of FMCs failing to display the FIX (1L) on the RTA PROGRESS Page 3/3 after the flight crew loaded an RTA clearance from an ATC data link message. The RTA (1R) displayed and the EXEC light illuminated, however both FMCs subsequently restarted with loss of performance data and the active flight plan.
Operating Instructions
This bulletin does not apply to airplanes modified by Boeing Service Bulletin 747-34A2672 (FMC software load 15).
To prevent occurrence of the RTA function anomaly, manually enter all RTA data. If the system does not accept and display FIX data, revert to non-RTA procedures and inform Air Traffic Control.
Administrative Information
This bulletin replaces bulletin ILF2-45 dated March 12, 1999. Discard Bulletin ILF2-45. Revise the Bulletin Record to show ILF2-45 CANCELLED (CANC).
CS3-2793 Page1of2
Operations Manual Bulletin No. ILF2-45(R1), Dated April 1, 2001 (continued)
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 ILF2-45(R1) 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
Page 2 of 2
Operations Manual Bulletin
for
International Lease Finance Corp.
The Boeing Company Seattle, Washington 98124-2207
Number: ILF2-47(R2)
Date: April 1, 2001 Document Effectivity: D6-30151-425 Subject: FMC ARRIVAL WAYPOINT SEQUENCE ANOMALY Reason: To inform flight crews of an FMC software anomaly associated with
duplicate route waypoints. 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.
THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
Background Information
A software anomaly may cause both FMCs to reset and eventually fail while adding or modifying the arrival portion of the route. The anomaly may occur when flight plan arrival modifications duplicate a waypoint in the active route. The duplicate waypoints may be separated by a route discontinuity or may appear with other waypoints between them. This anomaly most frequently occurs if the second duplicate waypoint has an “at or above” altitude constraint, and one (or more) waypoint on the legs page prior to the first occurrence also has a descent altitude constraint. When the downtrack duplicate waypoint is selected to the scratchpad and then entered in the discontinuity boxes (or after the first occurrence of the waypoint), the FMC flight planning function may not identify the second occurrence of the waypoint and subsequently reset. The FMCs may reset alternately until one or both fail, or the modification is rejected. The FMC alert message RESYNCING OTHER FMC and/or the FMC advisory message TIME OUT -RESELECT may be observed.
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