TM 1-1510-262-10
(12) Vertical speed hold mode. The vertical speed hold mode is used to automatically maintain the air-
craft at a selected vertical speed reference. To initiate the mode, the aircraft is maneuvered to the desired climb
or descent attitude to establish the vertical speed reference, then the mode is engaged by depressing the VS
pushbutton button-indicator on the light director mode selector. The reference vertical speed can be changed by
pushing the touch control steering (TCS ) switch on the control wheel and maneuvering the aircraft to a new vertical
speed reference and then releasing the switch. The vertical speed reference can also be changed by the use of
the pitch wheel on the autopilot controller. When the vertical speed mode is engaged, VS (green) will be annun-
ciated on the PFD, and the vertical speed target will be displayed in the lower left corner of the PFD. When the
vertical speed reference is changed by using the pitch wheel on the autopilot controller, the PFD s will indicate the
commanded vertical speed reference. Actual aircraft vertical speed will be displayed on the vertical speed indicator.
Selecting vertical speed (VS ) will reset all previously selected vertical modes.
Cancel Vertical speed mode by:
Depressing the VS pushbutton button-indicator on the light director mode selector.
Selecting another vertical mode.
Selecting the go-around mode.
Selecting the standby mode.
Coupling to the cross-side PFD.
Selecting an alternate ATT source on the display controller.
(13) Indicated airspeed hold mode. Activation of the IAS pushbutton indicator-selector switch on the
light director mode selector automatically commands the light director to maintain the present indicated airspeed.
The referenced airspeed can be changed by depressing the touch control steering (TCS ) switch on the control
wheel, maneuvering the aircraft to a new indicated airspeed, then releasing the TCS switch. The airspeed ref-
erence can also be changed by using the pitch wheel on the autopilot controller. When the airspeed mode is
engaged, IAS (green) will be annunciated on the PFD, and the indicated airspeed target will be displayed in the
lower left corner of the PFD. Actual aircraft indicated airspeed will be displayed on the PFD airspeed tape. When
the indicated airspeed hold mode is selected, all previously selected vertical modes will be reset.
Cancel the indicated airspeed hold mode by:
Depressing the IAS pushbutton button-indicator on the light director mode selector
Selecting another vertical mode
Selecting go-around
Coupling to the cross-side FMS
(14) Altitude hold mode. The altitude hold mode is a vertical light director mode which is used to main-
tain a barometric altitude reference. The vertical command for altitude hold is displayed on the light director pitch
command cue on the PFD. To select altitude hold, depress the ALT pushbutton button-indicator located on the light
director mode selector, while operating in any lateral mode. The ALT (green) annunciator will be illuminated on the
PFD while altitude hold mode is active. The vertical axis of the light director will maintain the barometric altitude
at the time of mode engagement. The reference altitude may be change by depressing the touch control steering
(TCS ) switch on the control wheel, maneuvering the aircraft to the desired altitude, then releasing the TCS switch.
Cancel the altitude hold mode by:
Moving the pitch wheel on the autopilot controller.
Depressing the ALT pushbutton button-indicator on the light director mode selector.
Selecting any other vertical mode.
Coupling to the cross-side FMS.
Selecting an alternate ATT source on the display controller.
(15) Altitude preselect mode. The altitude preselect (ALT SEL ) mode is used in conjunction with an-
other vertical mode to achieve automatic capture, lare, and level-off onto a preselected altitude. The ALT SEL
mode is armed by depressing the ALT SEL pushbutton button-indicator on the light director mode selector. The
desired altitude is entered into the altitude preselector display window using the SET knob. When armed, the ALT
SELL mode is annunciated on the PFD. Vertical speed hold mode (VS HOLD), indicated airspeed hold (IAS), or
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