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747-28-2225 (Rev2)
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747-28-2226.
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Operations Manual Bulletin No. ILF2-41(R5), Dated April 1, 1999 (continued)
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 MS 20-89
Seattle, WA 98124-2207 USA
Fax: Telex: (206) 662-7812 32-9430 Station 627
SITA: SEABO7X
Page 5 of 6
Operations Manual Bulletin No. ILF2-41(R5), Dated April 1, 1999 (continued)
Intentionally
Blank
Page 6 of 6
Operations Manual Bulletin
for
International Lease Finance Corp.
The Boeing Company Seattle, Washington 98124-2207
Number: ILF2-42(R1)
Date: April 1, 1999 Document Effectivity: D6-30151-425 Subject: EICAS ADVISORY MESSAGE “NO AUTOLAND” Reason: To inform flight crews of the possible loss of all autopilot capability if
the EICAS advisory message NO AUTOLAND displays. 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
An anomaly in the flight control system can cause simultaneous failure of both Stab Trim/Rudder Ratio Modules (SRMs). This condition displays the EICAS advisory message NO AUTOLAND, which is inhibited on the ground until engine start. With a failure of both SRMs, the autopilots cannot be engaged.
Operating Instructions
If the NO AUTOLAND message displays after engine start and prior to takeoff, contact maintenance to determine autopilot capability.
WARNING: If maintenance action involves engaging an autopilot on the ground to test autopilot capability, ensure the autopilot is disengaged before taxi.
CS3-2733 Page1of2
Operations Manual Bulletin No. ILF2-42(R1), Dated April 1, 1999 (continued)
Administrative Information
Insert this bulletin behind the Bulletin Record page in Volume 1 of your Operations Manual. Amend the Bulletin Record to show bulletin ILF2-42(R1) IN EFFECT (IE).
This condition is temporary until the system is modified. This bulletin will be revised to include Service Bulletin information when available.
Mailing Address: Manager, Flight Technical Publications (747-400)
Boeing Commercial Airplane Group P.O. Box 3707 MS 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: ILF2-43(R2)
Date: April 1, 2001 Document Effectivity: D6-30151-425 Subject: FMC ALERT MESSAGE “ENTER IRS POSITION” Reason: To inform flight crews the FMC Alert Message ENTER IRS POSITION
may not display when an incorrect present position is entered for IRS alignment. 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
The FMC Alert Message ENTER IRS POSITION indicates the flight crew-entered present position did not pass an IRS comparison check, or the IRS is ready to enter the navigation mode and a present position has not been entered. Operators have reported isolated incidents of IRS alignment without display of the ENTER IRS POSITION message when an incorrect present position has been entered during preflight. As a result, airplanes have inadvertently dispatched with unreliable IRS position information. Engineering analysis indicates the anomaly is the result of a timing problem between the FMCs.
The TO/GA update (GPS not available) during takeoff does not correct the error. If the error is sufficiently large, FMC radio position updating will be locked out in flight. GPS position updating (if available) will function and slowly correct the position error at a rate of 4 NM per minute. In addition, large initial position errors can cause IRS magnetic variation errors affecting the accuracy of magnetic heading and track. Excessive magnetic track errors can cause AFDS localizer mode failure and subsequent inhibiting of automatic approaches. Complete correction of the FMC/IRS position error requires landing and full realignment in the navigation mode.
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