Flight Crew Operations Manual Bulletin
for
The Boeing Company Seattle, Washington 98124-2207
737
Number: SHZ-41 R1 Date: April 15, 2005 Document Effectivity:
Subject: Nuisance Stall Warning Stick Shaker Events
Reason: This bulletin provides information about nuisance stall warning stick shaker events experienced on 737-600/700/800/900 airplanes. The purpose of this reissue is to revise the crew action when maneuvering during flap retraction from Flaps 1 to Flaps Up with anti-ice selected ON.
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
A nuisance stall warning stick shaker event is one in which the stick shaker activates although the airplane is not near a stall condition. In-service incidents have revealed corners of the operating envelope where turbulence or additional maneuver loads can result in momentary nuisance stick shaker events. Boeing has determined the following flight conditions can lead to nuisance stick shaker events:
1.
Encountering moderate to severe turbulence when operating at or near the Maximum Operating Altitude.
2.
Maneuvering during flap retraction from Flaps 1 to Flaps Up after takeoff or during a missed approach when Engine Anti-Ice is ON or when Wing Anti-Ice has been selected ON after liftoff.
3.
Maneuvering at V2 speed following an engine failure on takeoff when Wing Anti-Ice has been selected ON after liftoff.
Boeing is investigating design changes to the Stall Management/Yaw Damper (SMYD) computer logic to minimize the frequency of these events.
Flight Crew Operations Manual Bulletin No. SHZ-41 R1, dated April 15, 2005 (continued)
Operating Instructions
Scenario 1: Moderate to severe turbulence is encountered when operating at or near the Maximum Operating Altitude.
Crew Action:
No change in operations is required. Flight crews should be aware stall warning
stick shaker events have occurred in moderate turbulence, particularly when
flying near the lower amber band when at or near maximum operating altitudes.
Scenario 2: After takeoff or missed approach, the airplane is maneuvered during flap retraction from Flaps 1 to Flaps Up with Engine Anti-Ice ON or Wing Anti-Ice selected ON after liftoff.
Crew Action: During flap retraction from Flaps 1 to Flaps Up, limit bank angle to 15 degrees and avoid higher maneuver loading of the aircraft until the Leading Edge Flaps Transit light has extinguished. If a higher bank angle is required during this time, avoid the selection of Flaps 1 to Flaps Up until maneuvering is complete or bank angles are 15 degrees or less.
NOTE: A non-maneuvering segment of approximately 1 nm during all-engine operations or approximately 2.5 nm for an engine-out operation will allow for flaps to be retracted from Flaps 1 to Flaps Up.
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