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position
3 deg left Main and Standby
tied to same
torque tube
(therefore Main
and Standby can
not disagree)
1b Main Rudder Servo Valve Primary: 1/2 rate;
Secondary:
Neutral
Primary: Neutral;
Secondary:
Neutral
** Follows command
input (always
engaged)
Primary: Neutral;
Secondary:
Neutral
N/A ** When unit is
physically
disconnected from
input linkage, bias
spring moves
Primary to 1/2
PCU rate (unit
was physically
disconnected)
2 Standby Rudder PCU
Piston
3.1" ~ 3.17" 0.07"; Retract Follows command
input (always
engaged)
Last commanded
position
1 deg right Main and Standby
tied to same
torque tube
(therefore Main
and Standby can
not disagree)
3 Aileron PCU - Piston -
3529
1.39" extend cyl.;
2.07" retract cyl
1.72" 0.33" retract;
0.35" retract
Follows command
input (always
engaged)
Last commanded
position
3.5 deg left
aileron down or
right aileron up
Rod bent
4 Aileron PCU - Piston -
3509
1.83" extend cyl;
1.60" retract cyl
1.72" 0.11" extend;
0.12" extend
Follows command
input (always
engaged)
Last commanded
position
1.2 deg left
aileron up or right
aileron down
Rod bent
E-3
No. Actuator/Part Name Measured
Position
Nominal/
Neutral
Position
Actuator
Extend or
Retract
Direction
Electrical,
Hidraulic,
Mechanical
control input
Engaged or
Disengaged
Expected
Unpowered
State
Equivalent
Surface
Position
Remarks
5 Elevator PCU - Piston -
3559
1.59" extend cyl;
1.87" retract cyl
1.72" 0.13" retract;
0.15" retract
Follows command
input (always
engaged)
Last commanded
position
1.5 deg trailing edge up
6 Elevator PCU - Piston -
3560
Piston missing 1.72" N/A Follows command
input (always
engaged)
Last commanded
position
Not measurable (piston missing)
7 Flight Spoiler Actuator -
8312A
0.410" ** .4-.5" Full Retract N/A - No servos Retracted/Down Down ** Measured Cap
to Rod end
8 Flight Spoiler Actuator -
8339A
0.410" ** .4-.5" Full Retract N/A - No servos Retracted/Down Down ** Measured Cap
to Rod end
9 Flight Spoiler Actuator -
8271A
0.465" ** .4-.5" Full Retract N/A - No servos Retracted/Down Down ** Measured Cap
to Rod end
10 Flight Spoiler Actuator -
8379A
0.410" ** .4-.5" Full Retract N/A - No servos Retracted/Down Down ** Measured Cap
to Rod end
11a Aileron Autopilot Servo -
A7072
.103" off center Centered Centered Disengaged * Disengaged * No input
command to Ail
PCUs
* Disengagement
of detent pistons
prevents mod
piston inputs to
PCU
11b Aileron Autopilot Servo -
A7017
Centered Centered Centered Disengaged * Disengaged * No input
command to Ail
PCUs
* Disengagement
of detent pistons
prevents mod
piston inputs to
PCU
E-4
No. Actuator/Part Name Measured
Position
Nominal/
Neutral
Position
Actuator
Extend or
Retract
Direction
Electrical,
Hidraulic,
Mechanical
control input
Engaged or
Disengaged
Expected
Unpowered
State
Equivalent
Surface
Position
Remarks
12a Elevator Autopilot Servo -
A7076
.25" off center Centered Centered Disengaged * Disengaged * No input
command to Elev
PCUs
* Disengagement
of detent pistons
prevents mod
piston inputs to
PCU
12b Elevator Autopilot Servo -
A6995
.20" off center Centered Centered Disengaged * Disengaged * No input
command to Elev
PCUs
* Disengagement
of detent pistons
prevents mod
piston inputs to
PCU
13 Mach Trim Fully retracted Centered Full Retract Follows command
input (on demand
system)
Last commanded
position
4.2 degrees
elevator trailing
edge up
Provides input
into Elevator
PCUs
14 Rudder Trim 1.4" ~ 1.44" ~ 0.04" retract ~ 0.06" retract Last commanded
position
Min right rudder
trim
Provides input
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本文链接地址：
NTSC Aircraft Accident Report SILKAIR FLIGHT MI 185 BOEING B(40)
