Flight Crew Operations Manual Bulletin
for
The Boeing Company Seattle, Washington 98124-2207
737
Number: SHZ-9 R1 Date: September 06, 1999 Document Effectivity:
Subject: Inadvertent RTO Autobraking During Landing
Reason: This is a reissue of SHZ-9, dated October 9, 1998, which informed flight crews of the potential risk of RTO braking during landing on 737-600/700/800 airplanes. The purpose of this reissue is to provide Service Letter 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
A 737-800 operator has reported three incidents of inadvertent selection of RTO braking during landing roll. In each case, flight crews were attempting to disarm the autobrakes by placing the Auto Brake Select Switch to the "OFF" position. The RTO events were caused by over-rotating the switch past the "OFF" position to the "RTO" position. Boeing Flight Test and Boeing Engineering have confirmed that RTO arming and application logic in the autobrake system may allow RTO braking to engage if the switch is placed in the "RTO" position at any speed after landing autobraking has initiated.
Boeing Service Letter 737-SL-32-078 provides information concerning an autobrake software modification to re-verify the arming conditions when RTO is selected during landing roll. This modification will prevent RTO braking even if the switch is inadvertently placed in the "RTO" position during landing.
Flight Crew Operations Manual Bulletin No. SHZ-9 R1, dated September 06, 1999 (continued)
Operating Instructions
Although the autobrake system can be disarmed by placing the Auto Brake Select Switch in the "OFF" position, Boeing recommends the use of manual braking to disarm the autobrake system. Flight crews may also disarm the autobrakes by moving the SPEED BRAKE lever to the down detent if speed brakes are not further required to assist stopping.
Administrative Information
This bulletin replaces bulletin SHZ-9, dated October 9, 1998. Discard bulletin SHZ-9. Revise the Bulletin Record page to show SHZ-9 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-9 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 Letter 737-SL-32-078. 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:
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