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THE FOLLOWING PROCEDURE AND/OR INFORMATION IS EFFECTIVE UPON RECEIPT
Background Information
Boeing has received a report of excessive pitch up and speed loss on an airplane equipped with the Collins Enhanced Digital Flight Control System (EDFCS) after selection of a new MCP altitude during an autopilot Altitude Acquire (ALT ACQ) maneuver.
Normally, if a new altitude is selected while in ALT ACQ, the Flight Control Computer (FCC) will automatically transition to vertical speed (V/S), synchronizing to the existing airplane vertical speed. If the selection is made after transition to Altitude Hold (ALT HLD), the FCC will remain in ALT HLD at the previously selected altitude.
It has been determined that if a new altitude selection is made when the FCC is in the final transition between ALT ACQ and ALT HLD (within a 200 msec window), an altitude somewhere between the previously selected MCP altitude and the new MCP altitude will be stored as the reference ALT HLD altitude. The FCC will command a pitch maneuver in the direction of this new altitude. This new pitch command may be excessive and if the autopilot is engaged, may require flight crew intervention to return the airplane to a normal flight path. 
Flight Crew Operations Manual Bulletin No. SHZ-36 R1, dated November 01, 2004 (continued)
This anomaly will be corrected in a future FCC software upgrade.
Operating Instructions
If the MCP altitude is adjusted during ALT ACQ or when ALT HLD is first displayed, monitor autopilot and flight director commands. The autopilot or flight director should transition to V/S or continue to level in ALT HLD at the previously selected altitude. If autopilot or flight director pitch commands are excessive, ensure proper flight path control and select a new pitch mode if required.
Administrative Information
This bulletin replaces bulletin SHZ-36, dated December 01, 2003. Discard bulletin SHZ-36. Revise the Bulletin Record to show SHZ-36 as "CANCELLED" (CANC).
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-36 R1 "IN EFFECT" (IE).
This bulletin will be canceled after Boeing is notified that all affected airplanes in your fleet have been modified by Service Bulletin 737-22A1164.  If you do not plan to modify all your airplanes and would like to have the contents of this bulletin incorporated in your FCOM, please advise Boeing accordingly.
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 
Fax Number: Telex:  SITA:  E-MAIL:  (206) 662-7812 329430 Station 627 LKEBO7X FTID@Boeing.com 

Flight Crew Operations Manual Bulletin
for
 

The Boeing Company Seattle, Washington 98124-2207

737
Number: SHZ-37 R1 Date: November 01, 2004 Document Effectivity: 
Subject:  Flight Director and Autopilot Mode Entry Failures 
Reason:   This bulletin informs flight crews of flight director and autopilot anomalies that may be seen on airplanes equipped with the Collins Enhanced Digital Flight Control System (EDFCS). The purpose of this reissue is to provide Service Bulletin informaton. 

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 received reports of failure of the flight director (F/D) to enter takeoff mode and failure of the autopilot and flight director to enter pitch cruise modes on airplanes equipped with the Collins Enhanced Digital Flight Control System (EDFCS).
In certain scenarios, an error in the Collins FCC software may leave the glide slope engage logic set internally in either FCC without a corresponding G/S flight mode annunciation (FMA) on that side. This will cause the F/D takeoff mode and some autopilot or F/D pitch cruise modes to be inhibited.
This condition may also occur when an autopilot or F/D approach is discontinued using means other than autopilot or F/D go-around.
This anomaly will be corrected in a future FCC software upgrade.
Flight Crew Operations Manual Bulletin No. SHZ-37 R1, dated November 01, 2004 (continued)
Operating Instructions
Prior to takeoff, turn both flight director (F/D) switches OFF. Cycle F/D A ON then OFF. Cycle F/D B ON then OFF. At the completion of these steps, resume normal AFDS operations. This procedure should be accomplished whether the F/Ds are used for takeoff or not.
　
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