.
Check the SAC's ability to correctly read gross weight data from FMC's ARINC 429 data bus.
.
Check the SAC's hardware that turns on the "Speedbrake Do Not Arm" light.
.
Check ADC data bus inputs.
.
Flaps inputs
.
Air ground logic
See Part II of this supplement for maintenance procedures.
Aviation Partners Boeing
757-200
MAINTENANCE MANUAL SUPPLEMENT
Part I
Figure 1
CONTROL STAND
Figure 2
Control Stand Looking Down
(Speedbrake Lever Location)
Aviation Partners Boeing
757-200
MAINTENANCE MANUAL SUPPLEMENT
Part I
Figure 3
Speedbrake Handle Forces
Aviation Partners Boeing
757-200
MAINTENANCE MANUAL SUPPLEMENT
Part I
Figure 4
Wiring Configuration – In Air with Flaps Up
AP57.2-0600-2 27-62-00
Page 12
Jan 07
Aviation Partners Boeing
757-200
MAINTENANCE MANUAL SUPPLEMENT
Part I
M10332
M10331
K149
K145
Figure 5
SAC Block Diagram
Aviation Partners Boeing
757-200
MAINTENANCE MANUAL SUPPLEMENT
Part I
7
THE MINIMUM SPEED FOR FLAPS 1 IS 200 KNOTS.
S=set R=reset
INPUT SIGNAL DEFAULTS
Parameter SAC Default for Autostow Function if Valid Signal is Not Received
Calibrated Airspeed 300 knots
Airplane Gross Weight 260,000 pounds
T.E. Flap Position Flaps Up
In Air Logic In Air
Figure 6 Speedbrake Autostow Function’s Control Law
Aviation Partners Boeing
757-200
MAINTENANCE MANUAL SUPPLEMENT
Part I
TURN ON
“AUTO SPDBRK”
LIGHT
AIRPLANE GROSS WEIGHT
GREATER THAN 221,000 LBS
AIRPLANE GROSS WEIGHT
LESS THAN 222,000 LBS
AIRPLANE GROSS WEIGHT
GREATER THAN 221,000 LBS
AIRPLANE GROSS WEIGHT
GREATER THAN 220,000 LBS
S=set R=reset
NOTE: Invalid Gross Weight Data Does not turn on “Speedbrake Do Not Arm” Light because the default gross weight value is 260,000 pounds, so Autostow is available.
Figure 7
“Speedbrake Do Not Arm” Light Logic for Autostow Function
Aviation Partners Boeing
757-200
MAINTENANCE MANUAL SUPPLEMENT
Part I
Up
Floor Beam
Support Fitting Control Rod (Existing)
Lever (Existing)
Stowed
Speedbrake Handle
Noback Mechanism
To Auto Speedbrake System, including actuator and LVDTS
Control Rod
Autostow Actuator
Spring Adjustment Lug
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