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further notice.
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
Page 4 of 4
Operations Manual Bulletin No. ILF2-36(R2), Dated April 1, 1999 (continued)
Intentionally
Blank
CS3 - 2711 Page 1 of 18
Sect Name
Operations Manual Bulletin
for
The Boeing Company
Seattle, Washington 98124-2207
International Lease Finance Corp.
Number: ILF2-40(R3)
Date: April 1, 2001
Document Effectivity: D6-30151-425
Subject: CONSECUTIVE CONDITIONAL ALTITUDE WAYPOINTS MAP
ANOMALY
Reason: To inform flight crews of an ND MAP display anomaly associated with
routes containing two consecutive conditional altitude waypoints.
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 to add Service Bulletin information.
Background Information
During flight test, a Boeing crew experienced a MAP display anomaly. Simulator
and lab tests show that when two consecutive conditional altitude waypoints exist
in a procedure, the MAP display of the magenta line does not reflect the intended
path on the active leg for the conditional altitude waypoint. The displayedmagenta
line may erroneously indicate a turn prior to the airplane satisfying the required
altitude for the turn. Conditional altitude waypoints are depicted as small circles
along with the altitude on the ND map display, and their location depends on the
airplane satisfying the altitude associated with the leg.
Consecutive conditional altitude waypoints may appear in SIDS and Missed
Approach procedures and are automatically entered into the route when a
procedure is selected from the FMS-CDU DEPARTURES or ARRIVALS page.
Procedures which use this combination of two consecutive altitude waypoints
usually require a climb to a specified altitude followed by a small turn to intercept
a VOR radial while climbing to a higher altitude. Approximately 400 procedures
worldwide are affected by this anomaly. Tables listing all currently affected
procedures in the navigation data base are included in this bulletin.
Honeywell and Boeing are investigating this anomaly.
Page 2 of 18
Operations Manual Bulletin No. ILF2-40(R3), Dated April 1, 2001 (continued)
The typical ND map display and corresponding RTE LEGS page display for
conditional altitude waypoints are shown below:
Operating Instructions
This bulletin does not apply to airplanes modified by Boeing Service Bulletin 747-
34A2672 (FMC software load 15).
When flying a Standard Instrument Departure (SID) or missed approach
procedure containing consecutive conditional altitude waypoints, the active route
shown on the NDMAP is incorrect. However, LNAV guidance is reliable and may
be flown using either the flight director or autopilot. Monitor LNAV progress and
ensure all altitudes and turn points are consistent with the procedure and available
raw data
063o
( 9700)
( 9700)
070o
( 4500)
070o TRK
( 4500)
070o TRK
( 4500)
070o HDG
Description
Consecutive Course
Followed by
Outbound Radial
to an Altitude
Constant Heading
to an Altitude
Constant Course
to an Altitude
Outbound Radial
to an Altitude
to an Altitude
ND Map Display CDU LEGS Page Display
9700
9700
ABC
ABC
4500
4500
4500
Page 3 of 18
Operations Manual Bulletin No. ILF2-40(R3), Dated April 1, 2001 (continued)
Table 1: Standard Instrument Departures
ICAO
ID
Airport Departure Runway
EDFH Hahn, Germany RUWE1E RW03
ENBO Bodo, Norway GLOM2B RW26
ENBO Bodo, Norway STOB1B RW26
ENDU Bardufoss, Norway BDF2 RW11
ENDU Bardufoss, Norway LAVN2A RW11
ENDU Bardufoss, Norway TULD2A RW11
ENZV Stavanger/Sola, Norway BANK1D RW29
ENZV Stavanger/Sola, Norway DOGI1D RW11
ENZV Stavanger/Sola, Norway DOLF1D RW29
ENZV Stavanger/Sola, Norway FUND1D RW29
ENZV Stavanger/Sola, Norway GRAM1D RW11
ENZV Stavanger/Sola, Norway LUCK1D RW29
ENZV Stavanger/Sola, Norway MADY1D RW11
ENZV Stavanger/Sola, Norway OKLA1D RW11
ENZV Stavanger/Sola, Norway SIRD1D RW11
　
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