For dual FMC equipped airplanes:
. If one or both FMCs experience a program fault, cycling the FMC source select switch to a different source for 10 seconds will restore the FMC groundspeed to the correct value.
FMC navigation is restored when the FMC groundspeed is within 20 kts of the IRS groundspeed. FMC and IRS groundspeeds are displayed on the CDU POS REF 2/3 page. After the FMC recovers, the RTE LEGS page will display an inactive route with a SELECT ACTIVE WPT/LEG message. Select the appropriate active waypoint and resume FMC navigation.
Administrative Information
This bulletin replaces bulletin SHZ-12, dated December 1, 1998. Discard bulletin SHZ-12. Revise the Bulletin Record page to show SHZ-12 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-12 R1 "IN EFFECT" (IE).
This bulletin will be cancelled after Boeing is notified that all affected airplanes in your fleet have been modified by Service Bulletin 737– 34A1502. If you do not plan to modify all your airplanes and would like to have the contents of this bulletin incorporated in your Operations Manual, 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 No. SHZ-12 R1, dated March 01, 1999 (continued)
Intentionally
Blank

Flight Crew Operations Manual Bulletin
for
 

The Boeing Company Seattle, Washington 98124-2207

737
Number: SHZ-13 R2 Date: June 30, 2004 Document Effectivity: 
Subject:  Improper Autothrottle Thrust SettingAssumed Temperature Derated Takeoff   During  Go-Around  After 
Reason:   To inform flight crews of operational issues associated with an FMC/Autothrottle interface anomaly. The purpose of this reissue is to provide Service Bulletin information. 

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
In 737-600/-700/-800 airplanes, after a reduced thrust takeoff is performed using the assumed temperature method, the autothrottle may not advance thrust to the rated go-around thrust setting when requested to do so. The FMC applies the assumed temperature reduction to the go-around rating sent to the autothrottle for the duration of the flight if a cruise altitude of approximately 15,000 feet is not achieved during the flight. During approach, with the first TO/GA switch activation, the autothrottle may not advance to the correct go-around thrust to meet climb rate requirements (1000 - 2000 FPM). In addition, full rated go-around thrust settings will not be available from the autothrottle with the second TO/GA switch activation. However, in all cases, the go-around thrust setting reference displayed to the flight crew on the N1 indicator will be correct and full rated go-around thrust will be available by manually advancing the thrust levers to maximum rated thrust.
This situation does not occur after a full thrust takeoff or if the takeoff is performed using only a fixed derate. Additionally, if a fixed derate is further reduced using the assumed temperature method, the FMC will apply the assumed temperature reduction to the fixed derate thrust during the takeoff phase of flight.
Flight Crew Operations Manual Bulletin No. SHZ-13 R2, dated June 30, 2004 (continued)
Both the fixed derate and the assumed temperature thrust reduction will then gradually decrease until full rated thrust is restored at approximately 15,000 feet. On approach, the FMC will apply the full thrust rating for the engine and send this value to the autothrottle for go-around.
Operating Instructions
Operators should implement one or more of the following crew procedures until the 737-600/-700/-800 FMC software has been modified to correct this anomaly:
.
Crews should closely monitor autothrottle function and manually override when required.

.
Use only manual thrust setting techniques for go-around if an assumed temperature thrust reduction was selected at the departure airport and the airplane has not climbed above 15,000 feet.
　
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