SHAFT IDLE MODE switch. This switch is not
directions (ahead and astern), the EOT WRONG
functional in this system and has only one
DIRECTION indicator at the top of the EOT
position (NORM). To the right of the switch is
illuminates and sounds an alarm.
the TOTAL SHAFT REVOLUTIONS counter.
This counter shows total shaft revolutions of the
The ASTERN PITCH indicator illuminates
when the pitch of the propeller is in the astern
The shaft brake subsection is located below
the SHAFT SPEED meter. One control push
button and two indicators are used to display
conditions of the shaft brake. The shaft brake
ACTUATOR AIR LOW PRESS alarm indicator
alerts the operator if the air pressure used to
operate the shaft brake drops below 1150 psig.
The split-legend indicator labeled ENGAGED/
DISENGAGED is for the shaft brake and
illuminates to show the actual status of the shaft
brake. The split-legend, push-button indicator
labeled ENGAGE/DISENGAGE is used to apply
and release the shaft brake. It will illuminate to
indicate the operator command to the brake. It
may only be applied if the following conditions
Shaft speed is less than 75 rpm.
Throttles are at idle.
Pitch is at zero.
Only the station in control of the GTE(s)
may apply the shaft brake electrically.
When these permissives are met, the control
SHAFT PERFORMANCE MONITORING
push button activates the shaft brake. If one of
SECTION. --Located to the right of the propeller
these permissives is lost, the shaft brake will
hydraulic system panel are the indicators used to
monitor the propeller shaft performance. This
The next indicator is labeled PRAIRIE AIR
section (C) has three meters used to monitor
HIGH TEMP. It will illuminate and sound an
alarm when prairie air temperature exceeds 135°F.
indicators; shaft brake controls; and indicators
Below the shaft brake subsection are two
and engine mode select controls.
indicators, one per GTE, labeled LOCAL LOCK-
The SHAFT POWER edgewise meter displays
OUT IN EFFECT. The indicator on the left is
for the 1B GTE and the indicator on the right is
receives its input from the processor. The next
for the 1A GTE. When either of these indicators
edgewise meter is used to display SHAFT
are illuminated, it means control of that GTE is
TORQUE. This parameter is also sent from the
at the LOP. In this subsection are two GTE
processor and is displayed in ft-lb. The third meter
control mode rotary switches, one per GTE.
is a horizontal edgewise meter that shows SHAFT
These switches are used to place the GTEs in
SPEED. Associated with the shaft speed meter
either REMOTE MANUAL or PROGRAMMED
and to the left of it is the SHAFT STOPPED
mode. The remote manual mode is used
indicator. It illuminates when the shaft is
when a GTE is started or stopped. It is also an
rotating less than 1/5 rpm. To the right side of
alternate method of operating the throttle/pitch
the shaft speed meter is the SHAFT REVERSE
combination if programmed control fails.
ROTATION indicator. It illuminates when the
Programmed control is the normal operating
propeller shaft is rotating in the reverse (counter-
throttle mode used after the GTE is started.
clockwise) direction. Next to this indicator is the