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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 displayed magenta 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.
CS3 -2711 Page 1 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:
Description ND Map Display CDU LEGS Page Display

4500 070o HDG
Constant Heading
to an Altitude
( 4500)

4500 070o TRK
Constant Course
to an Altitude
( 4500)

9700
Outbound Radial
070o
to an Altitude
( 9700)
ABC
070o TRK
4500
9700
Consecutive Course to an Altitude
( 4500)
Followed by
063o
Outbound Radial
( 9700)
to an Altitude ABC
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 ND MAP 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
Page 2 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 
ENZV  Stavanger/Sola, Norway  STON1D  RW29 
ESNN  Sundsvall-Harnosand, Sweden  LUE1C  RW34 
ESNN  Sundsvall-Harnosand, Sweden  STEW2C  RW34 
FACT  Cape Town, South Africa  OKTE2B  RW19 
FACT  Cape Town, South Africa  PARI2B  RW19 
GCFV  Fuerteventura, Canary Is  KORA1R  RW19 
GCFV  Fuerteventura, Canary Is  LPC2R  RW19 
GCFV  Fuerteventura, Canary Is  LT1R  RW19 
GCFV  Fuerteventura, Canary Is  SAMA1R  RW19 
GCFV  Fuerteventura, Canary Is  TFN1R  RW19 
GCFV  Fuerteventura, Canary Is  TFS2R  RW19 
GCFV  Fuerteventura, Canary Is  VAST1R  RW19 
KBZN  Boseman/Gallatin, MT  BZN365  RW30 

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 
KBZN  Boseman/Gallatin, MT  BZN86S  RW30 
　
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