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for
The Boeing Company
Seattle, Washington 98124-2207
International Lease Finance Corp.
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
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.
administrative purposes.
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.
Page 2 of 2
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: (206) 662-7812
Telex: 32-9430 Station 627
SITA: SEABO7X
CS3 - 2730 Page 1 of 4
Sect Name
Operations Manual Bulletin
for
The Boeing Company
Seattle, Washington 98124-2207
International Lease Finance Corp.
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 AlertMessage ENTER IRS POSITION
may not display when an incorrect present position is entered for IRS
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.
alignment. Revised to add Service Bulletin information.
Background Information
The FMC Alert Message ENTER IRS POSITION indicates the flight crewentered
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 NMper 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.
Page 2 of 4
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,
　
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