Flight Crew Operations Manual Bulletin
for
The Boeing Company Seattle, Washington 98124-2207
737
Number: SHZ-38 Date: January 12, 2004 Document Effectivity:
Subject: Flight Director Anomaly
Reason: This bulletin informs flight crews of a Flight Director anomaly during Flight Director Takeoffs on airplanes equipped with the Collins Enhanced Digital Flight Control System (EDFCS).
Information in this Flight Crew Operations Manual (FCOM) 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
Boeing has discovered a flight director anomaly on airplanes equipped with the Collins Enhanced Digital Flight Control System (EDFCS). The anomaly may occur if the TO/GA switch is pressed a second time after liftoff while the flight director is already in takeoff mode. This anomaly only occurs during a flight director takeoff. Go-around mode is not affected, nor is operation with the autopilot engaged.
If LNAV has been selected prior to takeoff and a TO/GA switch has been pushed, pushing a TO/GA switch a second time after liftoff results in loss of flight director roll guidance and roll mode annunciation. Flight director roll guidance will be removed from view on those airplanes equipped with the split axis flight director and both pitch and roll flight director guidance will be removed from view on those airplanes equipped with the integrated cue flight director. This anomaly will occur anytime the airplane is in takeoff mode, regardless of altitude. LNAV or another roll mode can be re-selected anytime above 400 feet AGL and the correct flight director information will be displayed.
In addition, on those airplanes with the Heading Select-on-Takeoff option, pushing a TO/GA switch a second time while in Takeoff Heading Select mode
Flight Crew Operations Manual Bulletin No. SHZ-38, dated January 12, 2004 (continued)
above 400 feet AGL, will also result in loss of flight director roll guidance and roll mode annunciation. The flight director bar(s) will be removed from view. The correct flight director information will be displayed after re-selecting a roll mode.
This anomaly is present on all airplanes equipped with the Collins EDFCS, regardless of software load (i.e., P1.1 or P2.0). It will be corrected in a future FCC software upgrade targeted for first quarter 2005.
Operating Instructions
If roll mode annunciation and flight director guidance (roll, or pitch and roll) is lost following a second push of a TO/GA switch, reselect the appropriate roll mode when above 400 feet AGL.
Administrative Information
Insert this bulletin behind the FCOM Bulletin Record Page in Volume 1 of your FCOM. Amend the FCOM Bulletin Record Page to show Bulletin SHZ-38 "IN EFFECT" (IE)
This condition is temporary until the system is modified. This FCOM bulletin will be revised to include Service Bulletin information when available.
Please send all correspondence regarding FCOM bulletin status to one of the
following addresses:
Mailing Address: Manager 737, Flight Technical Integration & Data Boeing Commercial Airplane Group P. O. Box 3707 MS 20-89 Seattle, WA 98124-2207 USA
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